Java 类javax.tools.ForwardingJavaFileManager 实例源码

private Compile(String html, String code) throws IOException {
    this.pkg = find("package", ';', code);
    this.cls = find("class ", ' ', code);
    this.html = html;
    this.clfm = new ClassLoaderFileManager();

    final JavaFileObject file = clfm.createMemoryFileObject(
            ClassLoaderFileManager.convertFQNToResource(pkg.isEmpty() ? cls : pkg + "." + cls) + Kind.SOURCE.extension,
            Kind.SOURCE,
            code.getBytes());
    final JavaFileObject htmlFile = clfm.createMemoryFileObject(
        ClassLoaderFileManager.convertFQNToResource(pkg),
        Kind.OTHER,
        html.getBytes());

    JavaFileManager jfm = new ForwardingJavaFileManager<JavaFileManager>(clfm) {
        @Override
        public FileObject getFileForInput(Location location, String packageName, String relativeName) throws IOException {
            if (location == StandardLocation.SOURCE_PATH) {
                if (packageName.equals(pkg)) {
                    return htmlFile;
                }
            }
            return null;
        }
    };

    this.info = new CompilationInfo(file, jfm);
}

private Map<String, byte[]> compile(final String html, final String code) throws IOException {
    final ClassLoaderFileManager clfm = new ClassLoaderFileManager();
    final JavaFileObject file = clfm.createMemoryFileObject(
            ClassLoaderFileManager.convertFQNToResource(pkg.isEmpty() ? cls : pkg + "." + cls) + Kind.SOURCE.extension,
            Kind.SOURCE,
            code.getBytes());
    final JavaFileObject htmlFile = clfm.createMemoryFileObject(
        ClassLoaderFileManager.convertFQNToResource(pkg),
        Kind.OTHER,
        html.getBytes());

    JavaFileManager jfm = new ForwardingJavaFileManager<JavaFileManager>(clfm) {            
        @Override
        public FileObject getFileForInput(Location location, String packageName, String relativeName) throws IOException {
            if (location == StandardLocation.SOURCE_PATH) {
                if (packageName.equals(pkg)) {
                    return htmlFile;
                }
            }                
            return null;
        }
    };

    final Boolean res = ToolProvider.getSystemJavaCompiler().getTask(null, jfm, this, /*XXX:*/Arrays.asList("-source", "1.7", "-target", "1.7"), null, Arrays.asList(file)).call();
    Map<String, byte[]> result = new HashMap<>();
    for (MemoryFileObject generated : clfm.getGeneratedFiles(Kind.CLASS)) {
        result.put(generated.getName().substring(1), generated.getContent());
    }
    return result;
}