replace the generation from proto with generation from nanoproto

java/libphonenumber/src/com/google/i18n/phonenumbers/AsYouTypeFormatter.java

@@ -16,8 +16,8 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
 
 import java.util.ArrayList;
 import java.util.Iterator;

java/libphonenumber/src/com/google/i18n/phonenumbers/MetadataManager.java

@@ -16,16 +16,16 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.protobuf.nano.CodedInputByteBufferNano;
 
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Iterator;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.logging.Level;
@@ -71,14 +71,33 @@ class MetadataManager {
     }
   }
 
+  // The size of the byte buffer used for deserializing the alternate formats and short number
+  // metadata files for each region.
+  private static final int BUFFER_SIZE = 16 * 1024;
+
+  static CodedInputByteBufferNano convertStreamToByteBuffer(ObjectInputStream in, int bufferSize)
+      throws IOException {
+    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+    int nRead;
+    byte[] data = new byte[bufferSize];
+
+    while ((nRead = in.read(data, 0, bufferSize)) != -1) {
+      outputStream.write(data, 0, nRead);
+    }
+
+    outputStream.flush();
+    return CodedInputByteBufferNano.newInstance(outputStream.toByteArray());
+  }
+
   private static void loadAlternateFormatsMetadataFromFile(int countryCallingCode) {
     InputStream source = PhoneNumberMatcher.class.getResourceAsStream(
         ALTERNATE_FORMATS_FILE_PREFIX + "_" + countryCallingCode);
     ObjectInputStream in = null;
     try {
       in = new ObjectInputStream(source);
+      CodedInputByteBufferNano byteBuffer = convertStreamToByteBuffer(in, BUFFER_SIZE);
       PhoneMetadataCollection alternateFormats = new PhoneMetadataCollection();
-      alternateFormats.readExternal(in);
+      alternateFormats.mergeFrom(byteBuffer);
       for (PhoneMetadata metadata : alternateFormats.metadata) {
         callingCodeToAlternateFormatsMap.put(metadata.countryCode, metadata);
       }
@@ -107,8 +126,9 @@ class MetadataManager {
     ObjectInputStream in = null;
     try {
       in = new ObjectInputStream(source);
+      CodedInputByteBufferNano byteBuffer = convertStreamToByteBuffer(in, BUFFER_SIZE);
       PhoneMetadataCollection shortNumberMetadata = new PhoneMetadataCollection();
-      shortNumberMetadata.readExternal(in);
+      shortNumberMetadata.mergeFrom(byteBuffer);
       for (PhoneMetadata metadata : shortNumberMetadata.metadata) {
         regionCodeToShortNumberMetadataMap.put(regionCode, metadata);
       }

java/libphonenumber/src/com/google/i18n/phonenumbers/MetadataSource.java

@@ -16,7 +16,7 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
 
 /**
  * A source for phone metadata for all regions.

java/libphonenumber/src/com/google/i18n/phonenumbers/MultiFileMetadataSourceImpl.java

@@ -16,15 +16,15 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.protobuf.nano.CodedInputByteBufferNano;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -103,9 +103,8 @@ final class MultiFileMetadataSourceImpl implements MetadataSource {
       logger.log(Level.SEVERE, "missing metadata: " + fileName);
       throw new IllegalStateException("missing metadata: " + fileName);
     }
-    ObjectInputStream in = null;
     try {
-      in = new ObjectInputStream(source);
+      ObjectInputStream in = new ObjectInputStream(source);
       PhoneMetadataCollection metadataCollection = loadMetadataAndCloseInput(in);
       PhoneMetadata[] metadataList = metadataCollection.metadata;
       if (metadataList.length == 0) {
@@ -135,9 +134,15 @@ final class MultiFileMetadataSourceImpl implements MetadataSource {
    * @return        the loaded metadata protocol buffer.
    */
   private static PhoneMetadataCollection loadMetadataAndCloseInput(ObjectInputStream source) {
+    // The size of the byte buffer used for deserializing the phone number metadata files for each
+    // region.
+    final int MULTI_FILE_BUFFER_SIZE = 16 * 1024;
+
     PhoneMetadataCollection metadataCollection = new PhoneMetadataCollection();
     try {
-      metadataCollection.readExternal(source);
+      CodedInputByteBufferNano byteBuffer = MetadataManager.convertStreamToByteBuffer(source,
+          MULTI_FILE_BUFFER_SIZE);
+      metadataCollection.mergeFrom(byteBuffer);
     } catch (IOException e) {
       logger.log(Level.WARNING, "error reading input (ignored)", e);
     } finally {

java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberMatcher.java

@@ -19,10 +19,10 @@ package com.google.i18n.phonenumbers;
 import com.google.i18n.phonenumbers.PhoneNumberUtil.Leniency;
 import com.google.i18n.phonenumbers.PhoneNumberUtil.MatchType;
 import com.google.i18n.phonenumbers.PhoneNumberUtil.PhoneNumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
+import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
 
 import java.lang.Character.UnicodeBlock;
 import java.util.Iterator;

java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java

@@ -16,11 +16,11 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import java.io.InputStream;
 import java.util.ArrayList;
@@ -586,6 +586,24 @@ public class PhoneNumberUtil {
     nanpaRegions.addAll(countryCallingCodeToRegionCodeMap.get(NANPA_COUNTRY_CODE));
   }
 
+  /**
+   * Returns a copy of the given NumberFormat object.
+   */
+  static NumberFormat copyNumberFormat(NumberFormat other) {
+    NumberFormat copy = new NumberFormat();
+    copy.pattern = other.pattern;
+    copy.format = other.format;
+    int leadingDigitsPatternSize = other.leadingDigitsPattern.length;
+    copy.leadingDigitsPattern = new String[leadingDigitsPatternSize];
+    for (int i = 0; i < leadingDigitsPatternSize; i++) {
+      copy.leadingDigitsPattern[i] = other.leadingDigitsPattern[i];
+    }
+    copy.nationalPrefixFormattingRule = other.nationalPrefixFormattingRule;
+    copy.domesticCarrierCodeFormattingRule = other.domesticCarrierCodeFormattingRule;
+    copy.nationalPrefixOptionalWhenFormatting = other.nationalPrefixOptionalWhenFormatting;
+    return copy;
+  }
+
   /**
    * Attempts to extract a possible number from the string passed in. This currently strips all
    * leading characters that cannot be used to start a phone number. Characters that can be used to
@@ -1119,11 +1137,10 @@ public class PhoneNumberUtil {
       // If no pattern above is matched, we format the number as a whole.
       formattedNumber.append(nationalSignificantNumber);
     } else {
-      NumberFormat numFormatCopy = new NumberFormat();
       // Before we do a replacement of the national prefix pattern $NP with the national prefix, we
       // need to copy the rule so that subsequent replacements for different numbers have the
       // appropriate national prefix.
-      numFormatCopy.mergeFrom(formattingPattern);
+      NumberFormat numFormatCopy = copyNumberFormat(formattingPattern);
       String nationalPrefixFormattingRule = formattingPattern.nationalPrefixFormattingRule;
       if (nationalPrefixFormattingRule.length() > 0) {
         String nationalPrefix = metadata.nationalPrefix;
@@ -1475,8 +1492,7 @@ public class PhoneNumberUtil {
           break;
         }
         // Otherwise, we need to remove the national prefix from our output.
-        NumberFormat numFormatCopy = new NumberFormat();
-        numFormatCopy.mergeFrom(formatRule);
+        NumberFormat numFormatCopy = copyNumberFormat(formatRule);
         numFormatCopy.nationalPrefixFormattingRule = "";
         List<NumberFormat> numberFormats = new ArrayList<NumberFormat>(1);
         numberFormats.add(numFormatCopy);
@@ -1604,8 +1620,7 @@ public class PhoneNumberUtil {
         // If no pattern above is matched, we format the original input.
         return rawInput;
       }
-      NumberFormat newFormat = new NumberFormat();
-      newFormat.mergeFrom(formattingPattern);
+      NumberFormat newFormat = copyNumberFormat(formattingPattern);
       // The first group is the first group of digits that the user wrote together.
       newFormat.pattern = "(\\d+)(.*)";
       // Here we just concatenate them back together after the national prefix has been fixed.

java/libphonenumber/src/com/google/i18n/phonenumbers/Phonemetadata.java

@@ -1,603 +0,0 @@
-/*
- * Copyright (C) 2010 The Libphonenumber Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * Definition of the class representing metadata for international telephone numbers. This class is
- * hand created based on the class file compiled from phonemetadata.proto. Please refer to that file
- * for detailed descriptions of the meaning of each field.
- */
-
-package com.google.i18n.phonenumbers;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.io.Externalizable;
-import java.io.IOException;
-import java.io.ObjectInput;
-import java.io.ObjectOutput;
-import java.io.OutputStream;
-
-public final class Phonemetadata {
-  private Phonemetadata() {}
-  public static class NumberFormat implements Externalizable {
-    private static final long serialVersionUID = 1;
-    public NumberFormat() {}
-
-    // required string pattern = 1;
-    public String pattern = "";
-
-    // required string format = 2;
-    public String format = "";
-
-    // repeated string leading_digits_pattern = 3;
-    public String[] leadingDigitsPattern = new String[0];
-
-    // optional string national_prefix_formatting_rule = 4;
-    public String nationalPrefixFormattingRule = "";
-
-    // optional bool national_prefix_optional_when_formatting = 6;
-    public boolean nationalPrefixOptionalWhenFormatting = false;
-
-    // optional string domestic_carrier_code_formatting_rule = 5;
-    public String domesticCarrierCodeFormattingRule = "";
-
-    public NumberFormat mergeFrom(NumberFormat other) {
-      if (other.pattern.length() != 0) {
-        pattern = other.pattern;
-      }
-      if (other.format.length() != 0) {
-        format = other.format;
-      }
-      int leadingDigitsPatternSize = other.leadingDigitsPattern.length;
-      leadingDigitsPattern = new String[leadingDigitsPatternSize];
-      for (int i = 0; i < leadingDigitsPatternSize; i++) {
-        leadingDigitsPattern[i] = other.leadingDigitsPattern[i];
-      }
-      if (other.nationalPrefixFormattingRule.length() != 0) {
-        nationalPrefixFormattingRule = other.nationalPrefixFormattingRule;
-      }
-      if (other.domesticCarrierCodeFormattingRule.length() != 0) {
-        domesticCarrierCodeFormattingRule = other.domesticCarrierCodeFormattingRule;
-      }
-      nationalPrefixOptionalWhenFormatting = other.nationalPrefixOptionalWhenFormatting;
-      return this;
-    }
-
-    public void writeExternal(ObjectOutput objectOutput) throws IOException {
-      objectOutput.writeUTF(pattern);
-      objectOutput.writeUTF(format);
-      int leadingDigitsPatternSize = leadingDigitsPattern.length;
-      objectOutput.writeInt(leadingDigitsPatternSize);
-      for (int i = 0; i < leadingDigitsPatternSize; i++) {
-        objectOutput.writeUTF(leadingDigitsPattern[i]);
-      }
-
-      objectOutput.writeBoolean(nationalPrefixFormattingRule.length() != 0);
-      if (nationalPrefixFormattingRule.length() != 0) {
-        objectOutput.writeUTF(nationalPrefixFormattingRule);
-      }
-      objectOutput.writeBoolean(domesticCarrierCodeFormattingRule.length() != 0);
-      if (domesticCarrierCodeFormattingRule.length() != 0) {
-        objectOutput.writeUTF(domesticCarrierCodeFormattingRule);
-      }
-      objectOutput.writeBoolean(nationalPrefixOptionalWhenFormatting);
-    }
-
-    public void readExternal(ObjectInput objectInput) throws IOException {
-      pattern = objectInput.readUTF();
-      format = objectInput.readUTF();
-      int leadingDigitsPatternSize = objectInput.readInt();
-      leadingDigitsPattern = new String[leadingDigitsPatternSize];
-      for (int i = 0; i < leadingDigitsPatternSize; i++) {
-        leadingDigitsPattern[i] = objectInput.readUTF();
-      }
-      if (objectInput.readBoolean()) {
-        nationalPrefixFormattingRule = objectInput.readUTF();
-      }
-      if (objectInput.readBoolean()) {
-        domesticCarrierCodeFormattingRule = objectInput.readUTF();
-      }
-      nationalPrefixOptionalWhenFormatting = objectInput.readBoolean();
-    }
-  }
-
-  public static class PhoneNumberDesc implements Externalizable {
-    private static final long serialVersionUID = 1;
-    public PhoneNumberDesc() {}
-
-    // optional string national_number_pattern = 2;
-    public String nationalNumberPattern = "";
-
-    // optional string possible_number_pattern = 3;
-    public String possibleNumberPattern = "";
-
-    // optional string example_number = 6;
-    public String exampleNumber = "";
-
-    public PhoneNumberDesc mergeFrom(PhoneNumberDesc other) {
-      if (other.nationalNumberPattern.length() != 0) {
-        nationalNumberPattern = other.nationalNumberPattern;
-      }
-      if (other.possibleNumberPattern.length() != 0) {
-        possibleNumberPattern = other.possibleNumberPattern;
-      }
-      if (other.exampleNumber.length() != 0) {
-        exampleNumber = other.exampleNumber;
-      }
-      return this;
-    }
-
-    public boolean exactlySameAs(PhoneNumberDesc other) {
-      return nationalNumberPattern.equals(other.nationalNumberPattern) &&
-          possibleNumberPattern.equals(other.possibleNumberPattern) &&
-          exampleNumber.equals(other.exampleNumber);
-    }
-
-    public void writeExternal(ObjectOutput objectOutput) throws IOException {
-      objectOutput.writeBoolean(nationalNumberPattern.length() != 0);
-      if (nationalNumberPattern.length() != 0) {
-        objectOutput.writeUTF(nationalNumberPattern);
-      }
-
-      objectOutput.writeBoolean(possibleNumberPattern.length() != 0);
-      if (possibleNumberPattern.length() != 0) {
-        objectOutput.writeUTF(possibleNumberPattern);
-      }
-
-      objectOutput.writeBoolean(exampleNumber.length() != 0);
-      if (exampleNumber.length() != 0) {
-        objectOutput.writeUTF(exampleNumber);
-      }
-    }
-
-    public void readExternal(ObjectInput objectInput) throws IOException {
-      if (objectInput.readBoolean()) {
-        nationalNumberPattern = objectInput.readUTF();
-      }
-
-      if (objectInput.readBoolean()) {
-        possibleNumberPattern = objectInput.readUTF();
-      }
-
-      if (objectInput.readBoolean()) {
-        exampleNumber = objectInput.readUTF();
-      }
-    }
-  }
-
-  public static class PhoneMetadata implements Externalizable {
-    private static final long serialVersionUID = 1;
-    public PhoneMetadata() {}
-
-    // optional PhoneNumberDesc general_desc = 1;
-    public PhoneNumberDesc generalDesc = null;
-
-    // optional PhoneNumberDesc fixed_line = 2;
-    public PhoneNumberDesc fixedLine = null;
-
-    // optional PhoneNumberDesc mobile = 3;
-    public PhoneNumberDesc mobile = null;
-
-    // optional PhoneNumberDesc toll_free = 4;
-    public PhoneNumberDesc tollFree = null;
-
-    // optional PhoneNumberDesc premium_rate = 5;
-    public PhoneNumberDesc premiumRate = null;
-
-    // optional PhoneNumberDesc shared_cost = 6;
-    public PhoneNumberDesc sharedCost = null;
-
-    // optional PhoneNumberDesc personal_number = 7;
-    public PhoneNumberDesc personalNumber = null;
-
-    // optional PhoneNumberDesc voip = 8;
-    public PhoneNumberDesc voip = null;
-
-    // optional PhoneNumberDesc pager = 21;
-    public PhoneNumberDesc pager = null;
-
-    // optional PhoneNumberDesc uan = 25;
-    public PhoneNumberDesc uan = null;
-
-    // optional PhoneNumberDesc emergency = 27;
-    public PhoneNumberDesc emergency = null;
-
-    // optional PhoneNumberDesc voicemail = 28;
-    public PhoneNumberDesc voicemail = null;
-
-    // optional PhoneNumberDesc short_code = 29;
-    public PhoneNumberDesc shortCode = null;
-
-    // optional PhoneNumberDesc standard_rate = 30;
-    public PhoneNumberDesc standardRate = null;
-
-    // optional PhoneNumberDesc carrier_specific = 31;
-    public PhoneNumberDesc carrierSpecific = null;
-
-    // optional PhoneNumberDesc noInternationalDialling = 24;
-    public PhoneNumberDesc noInternationalDialling = null;
-
-    // required string id = 9;
-    public String id = "";
-
-    // optional int32 country_code = 10;
-    public int countryCode = 0;
-
-    // optional string international_prefix = 11;
-    public String internationalPrefix = "";
-
-    // optional string preferred_international_prefix = 17;
-    public String preferredInternationalPrefix = "";
-
-    // optional string national_prefix = 12;
-    public String nationalPrefix = "";
-
-    // optional string preferred_extn_prefix = 13;
-    public String preferredExtnPrefix = "";
-
-    // optional string national_prefix_for_parsing = 15;
-    public String nationalPrefixForParsing = "";
-
-    // optional string national_prefix_transform_rule = 16;
-    public String nationalPrefixTransformRule = "";
-
-    // optional bool same_mobile_and_fixed_line_pattern = 18 [default = false];
-    public boolean sameMobileAndFixedLinePattern = false;
-
-    // repeated NumberFormat number_format = 19;
-    public NumberFormat[] numberFormat = new NumberFormat[0];
-
-    // repeated NumberFormat intl_number_format = 20;
-    public NumberFormat[] intlNumberFormat = new NumberFormat[0];
-
-    // optional bool main_country_for_code = 22 [default = false];
-    public boolean mainCountryForCode = false;
-
-    // optional string leading_digits = 23;
-    public String leadingDigits = "";
-
-    // optional bool leading_zero_possible = 26 [default = false];
-    public boolean leadingZeroPossible = false;
-
-    // optional bool mobile_number_portable_region = 32 [default = false];
-    public boolean mobileNumberPortableRegion = false;
-
-    public void writeExternal(ObjectOutput objectOutput) throws IOException {
-      objectOutput.writeBoolean(generalDesc != null);
-      if (generalDesc != null) {
-        generalDesc.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(fixedLine != null);
-      if (fixedLine != null) {
-        fixedLine.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(mobile != null);
-      if (mobile != null) {
-        mobile.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(tollFree != null);
-      if (tollFree != null) {
-        tollFree.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(premiumRate != null);
-      if (premiumRate != null) {
-        premiumRate.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(sharedCost != null);
-      if (sharedCost != null) {
-        sharedCost.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(personalNumber != null);
-      if (personalNumber != null) {
-        personalNumber.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(voip != null);
-      if (voip != null) {
-        voip.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(pager != null);
-      if (pager != null) {
-        pager.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(uan != null);
-      if (uan != null) {
-        uan.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(emergency != null);
-      if (emergency != null) {
-        emergency.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(voicemail != null);
-      if (voicemail != null) {
-        voicemail.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(shortCode != null);
-      if (shortCode != null) {
-        shortCode.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(standardRate != null);
-      if (standardRate != null) {
-        standardRate.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(carrierSpecific != null);
-      if (carrierSpecific != null) {
-        carrierSpecific.writeExternal(objectOutput);
-      }
-      objectOutput.writeBoolean(noInternationalDialling != null);
-      if (noInternationalDialling != null) {
-        noInternationalDialling.writeExternal(objectOutput);
-      }
-
-      objectOutput.writeUTF(id);
-      objectOutput.writeInt(countryCode);
-      objectOutput.writeUTF(internationalPrefix);
-
-      objectOutput.writeBoolean(preferredInternationalPrefix.length() != 0);
-      if (preferredInternationalPrefix.length() != 0) {
-        objectOutput.writeUTF(preferredInternationalPrefix);
-      }
-
-      objectOutput.writeBoolean(nationalPrefix.length() != 0);
-      if (nationalPrefix.length() != 0) {
-        objectOutput.writeUTF(nationalPrefix);
-      }
-
-      objectOutput.writeBoolean(preferredExtnPrefix.length() != 0);
-      if (preferredExtnPrefix.length() != 0) {
-        objectOutput.writeUTF(preferredExtnPrefix);
-      }
-
-      objectOutput.writeBoolean(nationalPrefixForParsing.length() != 0);
-      if (nationalPrefixForParsing.length() != 0) {
-        objectOutput.writeUTF(nationalPrefixForParsing);
-      }
-
-      objectOutput.writeBoolean(nationalPrefixTransformRule.length() != 0);
-      if (nationalPrefixTransformRule.length() != 0) {
-        objectOutput.writeUTF(nationalPrefixTransformRule);
-      }
-
-      objectOutput.writeBoolean(sameMobileAndFixedLinePattern);
-
-      int numberFormatSize = numberFormat.length;
-      objectOutput.writeInt(numberFormatSize);
-      for (int i = 0; i < numberFormatSize; i++) {
-        numberFormat[i].writeExternal(objectOutput);
-      }
-
-      int intlNumberFormatSize = intlNumberFormat.length;
-      objectOutput.writeInt(intlNumberFormatSize);
-      for (int i = 0; i < intlNumberFormatSize; i++) {
-        intlNumberFormat[i].writeExternal(objectOutput);
-      }
-
-      objectOutput.writeBoolean(mainCountryForCode);
-
-      objectOutput.writeBoolean(leadingDigits.length() != 0);
-      if (leadingDigits.length() != 3) {
-        objectOutput.writeUTF(leadingDigits);
-      }
-
-      objectOutput.writeBoolean(leadingZeroPossible);
-
-      objectOutput.writeBoolean(mobileNumberPortableRegion);
-    }
-
-    public void readExternal(ObjectInput objectInput) throws IOException {
-      boolean hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        generalDesc = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        fixedLine = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        mobile = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        tollFree = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        premiumRate = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        sharedCost = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        personalNumber = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        voip = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        pager = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        uan = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        emergency = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        voicemail = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        shortCode = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        standardRate = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        carrierSpecific = desc;
-      }
-      hasDesc = objectInput.readBoolean();
-      if (hasDesc) {
-        PhoneNumberDesc desc = new PhoneNumberDesc();
-        desc.readExternal(objectInput);
-        noInternationalDialling = desc;
-      }
-
-      id = objectInput.readUTF();
-      countryCode = objectInput.readInt();
-      internationalPrefix = objectInput.readUTF();
-
-      boolean hasString = objectInput.readBoolean();
-      if (hasString) {
-        preferredInternationalPrefix = objectInput.readUTF();
-      }
-
-      hasString = objectInput.readBoolean();
-      if (hasString) {
-        nationalPrefix = objectInput.readUTF();
-      }
-
-      hasString = objectInput.readBoolean();
-      if (hasString) {
-        preferredExtnPrefix = objectInput.readUTF();
-      }
-
-      hasString = objectInput.readBoolean();
-      if (hasString) {
-        nationalPrefixForParsing = objectInput.readUTF();
-      }
-
-      hasString = objectInput.readBoolean();
-      if (hasString) {
-        nationalPrefixTransformRule = objectInput.readUTF();
-      }
-
-      sameMobileAndFixedLinePattern = objectInput.readBoolean();
-
-      int nationalFormatSize = objectInput.readInt();
-      numberFormat = new NumberFormat[nationalFormatSize];
-      for (int i = 0; i < nationalFormatSize; i++) {
-        numberFormat[i] = new NumberFormat();
-        numberFormat[i].readExternal(objectInput);
-      }
-
-      int intlNumberFormatSize = objectInput.readInt();
-      intlNumberFormat = new NumberFormat[intlNumberFormatSize];
-      for (int i = 0; i < intlNumberFormatSize; i++) {
-        intlNumberFormat[i] = new NumberFormat();
-        intlNumberFormat[i].readExternal(objectInput);
-      }
-
-      mainCountryForCode = objectInput.readBoolean();
-
-      hasString = objectInput.readBoolean();
-      if (hasString) {
-        leadingDigits = objectInput.readUTF();
-      }
-
-      leadingZeroPossible = objectInput.readBoolean();
-
-      mobileNumberPortableRegion = objectInput.readBoolean();
-    }
-  }
-
-  public static class PhoneMetadataCollection implements Externalizable {
-    private static final long serialVersionUID = 1;
-    public PhoneMetadataCollection() {}
-
-    // repeated PhoneMetadata metadata = 1;
-    public PhoneMetadata[] metadata = new PhoneMetadata[0];
-
-    public PhoneMetadataCollection addMetadata(PhoneMetadata value) {
-      if (value == null) {
-        throw new NullPointerException();
-      }
-      List<PhoneMetadata> metadataList =
-          new ArrayList<PhoneMetadata>(Arrays.asList(metadata));
-      metadataList.add(value);
-      metadata = metadataList.toArray(new PhoneMetadata[metadataList.size()]);
-      return this;
-    }
-
-    public void writeExternal(ObjectOutput objectOutput) throws IOException {
-      int size = metadata.length;
-      objectOutput.writeInt(size);
-      for (int i = 0; i < size; i++) {
-        metadata[i].writeExternal(objectOutput);
-      }
-    }
-
-    public void readExternal(ObjectInput objectInput) throws IOException {
-      int size = objectInput.readInt();
-      for (int i = 0; i < size; i++) {
-        PhoneMetadata phoneMetadata = new PhoneMetadata();
-        phoneMetadata.readExternal(objectInput);
-        List<PhoneMetadata> metadataList =
-            new ArrayList<PhoneMetadata>(Arrays.asList(metadata));
-        metadataList.add(phoneMetadata);
-        metadata = metadataList.toArray(new PhoneMetadata[metadataList.size()]);
-      }
-    }
-
-    public PhoneMetadataCollection clear() {
-      metadata = new PhoneMetadata[0];
-      return this;
-    }
-
-    public void writeTo(OutputStream output) throws java.io.IOException {
-      // Note: This is a stub for compilation purposes.
-    }
-  }
-}

java/libphonenumber/src/com/google/i18n/phonenumbers/ShortNumberInfo.java

@@ -16,11 +16,11 @@
 
 package com.google.i18n.phonenumbers;
 
+import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
 import com.google.i18n.phonenumbers.internal.MatcherApi;
 import com.google.i18n.phonenumbers.internal.RegexBasedMatcher;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
-import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import java.util.ArrayList;
 import java.util.Arrays;

java/libphonenumber/src/com/google/i18n/phonenumbers/SingleFileMetadataSourceImpl.java

@@ -16,8 +16,9 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.protobuf.nano.CodedInputByteBufferNano;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -133,9 +134,15 @@ final class SingleFileMetadataSourceImpl implements MetadataSource {
    * @return        the loaded metadata protocol buffer.
    */
   private static PhoneMetadataCollection loadMetadataAndCloseInput(ObjectInputStream source) {
+    // The size of the byte buffer for deserializing the single nano metadata file which holds
+    // metadata for all regions.
+    final int SINGLE_FILE_BUFFER_SIZE = 256 * 1024;
+
     PhoneMetadataCollection metadataCollection = new PhoneMetadataCollection();
     try {
-      metadataCollection.readExternal(source);
+      CodedInputByteBufferNano byteBuffer = MetadataManager.convertStreamToByteBuffer(
+          source, SINGLE_FILE_BUFFER_SIZE);
+      metadataCollection.mergeFrom(byteBuffer);
     } catch (IOException e) {
       logger.log(Level.WARNING, "error reading input (ignored)", e);
     } finally {

java/libphonenumber/src/com/google/i18n/phonenumbers/internal/MatcherApi.java

@@ -16,7 +16,7 @@
 
 package com.google.i18n.phonenumbers.internal;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 /**
  * Internal phonenumber matching API used to isolate the underlying implementation of the

java/libphonenumber/src/com/google/i18n/phonenumbers/internal/RegexBasedMatcher.java

@@ -16,8 +16,8 @@
 
 package com.google.i18n.phonenumbers.internal;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
 import com.google.i18n.phonenumbers.RegexCache;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import java.util.regex.Matcher;
 

java/libphonenumber/test/com/google/i18n/phonenumbers/ExampleNumbersTest.java

@@ -17,8 +17,8 @@
 package com.google.i18n.phonenumbers;
 
 import com.google.i18n.phonenumbers.PhoneNumberUtil.PhoneNumberType;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import junit.framework.TestCase;
 

java/libphonenumber/test/com/google/i18n/phonenumbers/MetadataManagerTest.java

@@ -16,7 +16,7 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
 
 import junit.framework.TestCase;
 

java/libphonenumber/test/com/google/i18n/phonenumbers/PhoneNumberUtilTest.java

@@ -17,11 +17,11 @@
 package com.google.i18n.phonenumbers;
 
 import com.google.i18n.phonenumbers.PhoneNumberUtil.PhoneNumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -145,7 +145,12 @@ public class PhoneNumberUtilTest extends TestMetadataTestCase {
     assertEquals("[13-689]\\d{9}|2[0-35-9]\\d{8}",
                  metadata.generalDesc.nationalNumberPattern);
     assertEquals("\\d{7}(?:\\d{3})?", metadata.generalDesc.possibleNumberPattern);
-    assertTrue(metadata.generalDesc.exactlySameAs(metadata.fixedLine));
+    assertTrue(metadata.generalDesc.nationalNumberPattern.equals(
+        metadata.fixedLine.nationalNumberPattern));
+    assertTrue(metadata.generalDesc.possibleNumberPattern.equals(
+        metadata.fixedLine.possibleNumberPattern));
+    assertTrue(metadata.generalDesc.exampleNumber.equals(
+        metadata.fixedLine.exampleNumber));
     assertEquals("\\d{10}", metadata.tollFree.possibleNumberPattern);
     assertEquals("900\\d{7}", metadata.premiumRate.nationalNumberPattern);
     // No shared-cost data is available, so it should be initialised to "NA".

tools/java/common/src/com/google/i18n/phonenumbers/BuildMetadataFromXml.java

@@ -16,10 +16,10 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
@@ -103,6 +103,7 @@ public class BuildMetadataFromXml {
     // a separate constants file.
     boolean isShortNumberMetadata = inputXmlFile.contains("ShortNumberMetadata");
     boolean isAlternateFormatsMetadata = inputXmlFile.contains("PhoneNumberAlternateFormats");
+    List<PhoneMetadata> phoneMetadataList = new ArrayList<PhoneMetadata>();
     for (int i = 0; i < numOfTerritories; i++) {
       Element territoryElement = (Element) territory.item(i);
       String regionCode = "";
@@ -113,8 +114,10 @@ public class BuildMetadataFromXml {
       }
       PhoneMetadata metadata = loadCountryMetadata(regionCode, territoryElement, liteBuild,
           isShortNumberMetadata, isAlternateFormatsMetadata);
-      metadataCollection.addMetadata(metadata);
+      phoneMetadataList.add(metadata);
     }
+    metadataCollection.metadata =
+        phoneMetadataList.toArray(new PhoneMetadata[phoneMetadataList.size()]);
     return metadataCollection;
   }
 
@@ -247,7 +250,7 @@ public class BuildMetadataFromXml {
       throw new RuntimeException("Invalid number of intlFormat patterns for country: " + countryId);
     } else if (intlFormatPattern.getLength() == 0) {
       // Default to use the same as the national pattern if none is defined.
-      intlFormat.mergeFrom(nationalFormat);
+      intlFormat = PhoneNumberUtil.copyNumberFormat(nationalFormat);
     } else {
       intlFormat.pattern = numberFormatElement.getAttribute(PATTERN);
       setLeadingDigitsPatterns(numberFormatElement, intlFormat);
@@ -260,7 +263,7 @@ public class BuildMetadataFromXml {
 
     if (!intlFormat.format.isEmpty()) {
       List<NumberFormat> formatList =
-          new ArrayList<NumberFormat> (Arrays.asList(metadata.intlNumberFormat));
+          new ArrayList<NumberFormat>(Arrays.asList(metadata.intlNumberFormat));
       formatList.add(intlFormat);
       metadata.intlNumberFormat = formatList.toArray(new NumberFormat[formatList.size()]);
     }
@@ -427,7 +430,16 @@ public class BuildMetadataFromXml {
       numberDesc.possibleNumberPattern = "NA";
       return numberDesc;
     }
-    numberDesc.mergeFrom(generalDesc);
+    if (generalDesc.nationalNumberPattern.length() != 0) {
+      numberDesc.nationalNumberPattern = generalDesc.nationalNumberPattern;
+    }
+    if (generalDesc.possibleNumberPattern.length() != 0) {
+      numberDesc.possibleNumberPattern = generalDesc.possibleNumberPattern;
+    }
+    if (generalDesc.exampleNumber.length() != 0) {
+      numberDesc.exampleNumber = generalDesc.exampleNumber;
+    }
+
     if (phoneNumberDescList.getLength() > 0) {
       Element element = (Element) phoneNumberDescList.item(0);
       NodeList possiblePattern = element.getElementsByTagName(POSSIBLE_NUMBER_PATTERN);

tools/java/common/test/com/google/i18n/phonenumbers/BuildMetadataFromXmlTest.java

@@ -16,9 +16,9 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import junit.framework.TestCase;
 

tools/java/cpp-build/pom.xml

@@ -30,25 +30,6 @@
           <target>1.5</target>
         </configuration>
       </plugin>
-      <!-- Create a directory called 'generated'. -->
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-antrun-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>create-generated-directory</id>
-            <phase>generate-sources</phase>
-            <configuration>
-              <tasks>
-                <mkdir dir="generated"/>
-              </tasks>
-            </configuration>
-            <goals>
-              <goal>run</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>build-helper-maven-plugin</artifactId>
@@ -86,7 +67,7 @@
         <configuration>
           <executable>protoc</executable>
           <arguments>
-            <argument>--java_out=generated</argument>
+            <argument>--javanano_out=java_package=phonemetadata.proto|com.google.i18n.phonenumbers.nano:../../../java/libphonenumber/src</argument>
             <argument>../../../resources/phonemetadata.proto</argument>
             <argument>--proto_path=../../../resources</argument>
           </arguments>

tools/java/cpp-build/src/com/google/i18n/phonenumbers/BuildMetadataCppFromXml.java

@@ -17,6 +17,8 @@
 package com.google.i18n.phonenumbers;
 
 import com.google.i18n.phonenumbers.CppMetadataGenerator.Type;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.protobuf.nano.CodedOutputByteBufferNano;
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -201,8 +203,16 @@ public class BuildMetadataCppFromXml extends Command {
   // @VisibleForTesting
   void writePhoneMetadataCollection(
       String inputFilePath, boolean liteMetadata, OutputStream out) throws IOException, Exception {
-    // Note: This is a stub and does nothing.
-    BuildMetadataFromXml.buildPhoneMetadataCollection(inputFilePath, liteMetadata).writeTo(out);
+    // The size of the byte buffer used for serializing the PhoneMetadataCollection.
+    int COLLECTION_BUFFER_SIZE = 256 * 1024;
+
+    PhoneMetadataCollection metadataCollection =
+        BuildMetadataFromXml.buildPhoneMetadataCollection(inputFilePath, liteMetadata);
+    byte[] outputArray = new byte[COLLECTION_BUFFER_SIZE];
+    CodedOutputByteBufferNano outputByteBuffer = CodedOutputByteBufferNano.newInstance(outputArray);
+    metadataCollection.writeTo(outputByteBuffer);
+    out.write(outputArray, 0, outputByteBuffer.position());
+    out.flush();
   }
 
   // @VisibleForTesting

tools/java/java-build/src/com/google/i18n/phonenumbers/BuildMetadataJsonFromXml.java

@@ -16,10 +16,10 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.NumberFormat;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.NumberFormat;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneNumberDesc;
 
 import java.io.BufferedWriter;
 import java.io.FileWriter;

tools/java/java-build/src/com/google/i18n/phonenumbers/BuildMetadataProtoFromXml.java

@@ -16,8 +16,9 @@
 
 package com.google.i18n.phonenumbers;
 
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
-import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadataCollection;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadata;
+import com.google.i18n.phonenumbers.nano.Phonemetadata.PhoneMetadataCollection;
+import com.google.protobuf.nano.CodedOutputByteBufferNano;
 
 import java.io.BufferedWriter;
 import java.io.File;
@@ -159,23 +160,36 @@ public class BuildMetadataProtoFromXml extends Command {
           BuildMetadataFromXml.buildPhoneMetadataCollection(inputFile, liteBuild);
 
       if (singleFile) {
+        int SINGLE_FILE_BUFFER_SIZE = 256 * 1024;
         FileOutputStream output = new FileOutputStream(filePrefix);
         ObjectOutputStream out = new ObjectOutputStream(output);
-        metadataCollection.writeExternal(out);
+        byte[] outputArray = new byte[SINGLE_FILE_BUFFER_SIZE];
+        CodedOutputByteBufferNano outputByteBuffer =
+            CodedOutputByteBufferNano.newInstance(outputArray);
+        metadataCollection.writeTo(outputByteBuffer);
+        out.write(outputArray, 0, outputByteBuffer.position());
+        out.flush();
         out.close();
       } else {
+        int MULTI_FILE_BUFFER_SIZE = 16 * 1024;
         for (PhoneMetadata metadata : metadataCollection.metadata) {
           String regionCode = metadata.id;
-          // For non-geographical country calling codes (e.g. +800), or for alternate formats, use the
-          // country calling codes instead of the region code to form the file name.
+          // For non-geographical country calling codes (e.g. +800), or for alternate formats, use
+          // the country calling codes instead of the region code to form the file name.
           if (regionCode.equals("001") || regionCode.isEmpty()) {
             regionCode = Integer.toString(metadata.countryCode);
           }
-          PhoneMetadataCollection outMetadataCollection = new PhoneMetadataCollection();
-          outMetadataCollection.addMetadata(metadata);
+          PhoneMetadataCollection singleCollection = new PhoneMetadataCollection();
+          singleCollection.metadata = new PhoneMetadata[1];
+          singleCollection.metadata[0] = metadata;
           FileOutputStream outputForRegion = new FileOutputStream(filePrefix + "_" + regionCode);
           ObjectOutputStream out = new ObjectOutputStream(outputForRegion);
-          outMetadataCollection.writeExternal(out);
+          byte[] outputArray = new byte[MULTI_FILE_BUFFER_SIZE];
+          CodedOutputByteBufferNano outputBufferNano =
+              CodedOutputByteBufferNano.newInstance(outputArray);
+          singleCollection.writeTo(outputBufferNano);
+          out.write(outputArray, 0, outputBufferNano.position());
+          out.flush();
           out.close();
         }
       }