1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 package org.chromium.content.app; 6 7 public class NativeLibraries { 8 /** 9 * IMPORTANT NOTE: The variables defined here must _not_ be 'final'. 10 * 11 * The reason for this is very subtle: 12 * 13 * - This template is used to generate several distinct, but similar 14 * files used in different contexts: 15 * 16 * o .../gen/templates/org/chromium/content/app/NativeLibraries.java 17 * 18 * This file is used to build content.jar, which is the library 19 * jar used by several content-based projects. However, the 20 * corresponding NativeLibraries.class file will _not_ be part 21 * of the final content.jar. 22 * 23 * o .../$PROJECT/native_libraries_java/NativeLibraries.java 24 * 25 * This file is used to build a content-based APK (e.g. $PROJECT 26 * could be 'content_shell_apk'). Its content will depend on 27 * this target's specific build configuration, and differ from 28 * the source file above. 29 * 30 * - During the final link, all .jar files are linked together into 31 * a single .dex file, and the second version of NativeLibraries.class 32 * will be put into the final output file, and used at runtime. 33 * 34 * - If the variables were defined as 'final', their value would be 35 * optimized out inside of 'content.jar', and could not be specialized 36 * for every content-based program. 37 * 38 * This exotic scheme is used to avoid injecting project-specific, or 39 * even build-specific, values into the content layer. E.g. this is 40 * how the component build is supported on Android without modifying 41 * the sources of each and every Chromium-based target. 42 */ 43 // Set to true to enable the use of the content Linker. 44 #if defined(ENABLE_CONTENT_LINKER) 45 public static boolean USE_LINKER = true; 46 #else 47 public static boolean USE_LINKER = false; 48 #endif 49 50 #if defined(ENABLE_CONTENT_LINKER_TESTS) 51 public static boolean ENABLE_LINKER_TESTS = true; 52 #else 53 public static boolean ENABLE_LINKER_TESTS = false; 54 #endif 55 56 // This is the list of native libraries to be loaded (in the correct order) 57 // by LibraryLoader.java. The content java library is compiled with no 58 // array defined, and then the build system creates a version of the file 59 // with the real list of libraries required (which changes based upon which 60 // .apk is being built). 61 // TODO(cjhopman): This is public since it is referenced by ChromeNativeTestActivity.java 62 // directly. The two ways of library loading should be refactored into one. 63 public static final String[] LIBRARIES 64 #include <native_libraries_array.h> 65 ; 66 // This is the expected version of the 'main' native library, which is the one that 67 // implements the initial set of content JNI functions including 68 // content::nativeGetVersionName() 69 // Note(aberent): This is logically final, but making it final breaks the build, since it 70 // lets other Java components read its value at compile time rather than at run time, hence 71 // reading it from the wrong class file. 72 static String VERSION_NUMBER 73 #include <native_libraries_version.h> 74 ; 75 } 76
