TOOLS: Update CMakeLists to auto-generate metadata for C++.

cpp/CMakeLists.txt

@@ -79,6 +79,9 @@ check_library_version (PC_ICU icui18n 4.4)
 find_required_program (PROTOC protoc
                        "Google Protocol Buffers compiler (protoc)")
 
+find_required_program (JAVA java
+                       "Java Runtime Environment")
+
 # Add protoc (Protocol Buffers compiler) target.
 set (RESOURCES_DIR "${CMAKE_SOURCE_DIR}/../resources")
 
@@ -109,6 +112,55 @@ add_custom_target (
   COMMENT "Generating Protocol Buffers code"
 )
 
+# Add metadata code generation targets.
+
+# This function is invoked twice to create metadata & test metadata code
+# generation targets.
+function (add_metadata_gen_target TARGET_NAME
+                                  XML_FILE
+                                  FOR_TESTING)
+  if (${FOR_TESTING} STREQUAL "true")
+    set (GEN_OUTPUT_PREFIX "${CMAKE_SOURCE_DIR}/src/metadata")
+  elseif (${FOR_TESTING} STREQUAL "false")
+    set (GEN_OUTPUT_PREFIX "${CMAKE_SOURCE_DIR}/src/test_metadata")
+  else ()
+    message (FATAL_ERROR
+      "Unexpected value '${FOR_TESTING}' for testing parameter")
+  endif ()
+
+  set (GEN_OUTPUT "${GEN_OUTPUT_PREFIX}.cc ${GEN_OUTPUT_PREFIX}.h")
+  set (JAR_PATH "${CMAKE_SOURCE_DIR}/../tools/java/cpp-build/target")
+  set (JAR_PATH "${JAR_PATH}/cpp-build-1.0-SNAPSHOT-jar-with-dependencies.jar")
+
+  add_custom_command (
+    COMMAND ${JAVA_BIN} -jar
+      ${JAR_PATH} BuildMetadataCppFromXml ${XML_FILE} ${CMAKE_SOURCE_DIR}/src
+      ${FOR_TESTING}
+
+    OUTPUT ${GEN_OUTPUT}
+    DEPENDS ${XML_FILE}
+  )
+  add_custom_target (
+    ${TARGET_NAME}
+    DEPENDS ${GEN_OUTPUT}
+    COMMENT "Generating Metadata code"
+  )
+endfunction (add_metadata_gen_target)
+
+# Add metadata generation target.
+add_metadata_gen_target (
+  "generate-metadata"
+  "${RESOURCES_DIR}/PhoneNumberMetaData.xml"
+  "false"
+)
+
+# Add test metadata generation target.
+add_metadata_gen_target (
+  "generate-test-metadata"
+  "${RESOURCES_DIR}/PhoneNumberMetaDataForTesting.xml"
+  "true"
+)
+
 # Platform independent sources.
 set (
   SOURCES
@@ -119,7 +171,7 @@ set (
   "src/base/threading/thread_restrictions.cc"
   "src/default_logger.cc"
   "src/logger_adapter.cc"
-  "src/metadata.cc"
+  "src/metadata.cc"         # Generated by build tools.
   "src/phonemetadata.pb.cc" # Generated by Protocol Buffers.
   "src/phonenumber.cc"
   "src/phonenumber.pb.cc"   # Generated by Protocol Buffers.
@@ -181,7 +233,7 @@ set (TEST_SOURCES
   "src/re2_cache_test.cc"
   "src/run_tests.cc"
   "src/stringutil_test.cc"
-  "src/test_metadata.cc"
+  "src/test_metadata.cc"  # Generated by build tools.
 )
 
 add_executable (libphonenumber_test ${TEST_SOURCES})