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/*
* Copyright 2011 Google Inc.
*
* 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.
*/
package com.google.web.bindery.requestfactory.apt;
import com.google.gwt.dev.util.Name.BinaryName;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import javax.lang.model.SourceVersion;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
/**
* Provides "late" validation services when server types aren't available to the
* shared-interface compilation process. This tool is provided the name of an
* output jar and the binary names of RequestFactory interfaces that should be
* validated. The validation process will provide pre-computed type map builders
* for use by the ServiceLayer.
*
* @see http://code.google.com/p/google-web-toolkit/wiki/
* RequestFactoryInterfaceValidation
*/
public class ValidationTool {
/**
* A JavaFileManager that writes the class outputs into a jar file or a
* directory.
*/
static class JarOrDirectoryOutputFileManager extends ForwardingJavaFileManager {
private final List toOutput = new ArrayList();
private final File output;
JarOrDirectoryOutputFileManager(File output, JavaFileManager fileManager) {
super(fileManager);
this.output = output;
}
@Override
public void close() throws IOException {
if (output.isDirectory()) {
writeToDirectory();
} else {
writeToJar();
}
}
/**
* Not expected to be called. Overridden to prevent accidental writes to
* disk.
*/
@Override
public FileObject getFileForOutput(Location location, String packageName, String relativeName,
FileObject sibling) throws IOException {
throw new UnsupportedOperationException("Not expecting to write " + packageName + "/"
+ relativeName);
}
/**
* This method will receive generated source and class files.
*/
@Override
public JavaFileObject getJavaFileForOutput(Location location, String className, Kind kind,
FileObject sibling) throws IOException {
String path = BinaryName.toInternalName(className);
String suffix;
switch (kind) {
case CLASS:
suffix = ".class";
break;
case SOURCE:
suffix = ".java";
break;
default:
throw new UnsupportedOperationException("Unexpected kind " + kind);
}
MemoryJavaFileObject toReturn =
new MemoryJavaFileObject(uri("memory:///" + path + suffix), kind);
if (StandardLocation.CLASS_OUTPUT.equals(location) && Kind.CLASS.equals(kind)) {
toOutput.add(toReturn);
}
return toReturn;
}
@Override
public boolean isSameFile(FileObject a, FileObject b) {
if (a instanceof MemoryJavaFileObject && b instanceof MemoryJavaFileObject) {
MemoryJavaFileObject memoryA = (MemoryJavaFileObject) a;
MemoryJavaFileObject memoryB = (MemoryJavaFileObject) b;
return memoryA.getKind().equals(memoryB.getKind())
&& memoryA.toUri().equals(memoryB.toUri());
}
if (a instanceof FakeJavaFileObject && b instanceof FakeJavaFileObject) {
// Only one file ever created
return true;
}
return super.isSameFile(a, b);
}
private void writeToDirectory() throws IOException {
for (MemoryJavaFileObject file : toOutput) {
String path = file.toUri().getPath();
if (path.equals("/fake/Fake.class")) {
// ignore dummy class
continue;
}
File target = new File(output, path);
target.getParentFile().mkdirs();
FileOutputStream out = new FileOutputStream(target);
out.write(file.bytes.toByteArray());
out.close();
}
}
private void writeToJar() throws IOException, FileNotFoundException {
JarOutputStream jar = new JarOutputStream(new FileOutputStream(output));
for (MemoryJavaFileObject file : toOutput) {
String path = file.toUri().getPath();
if (path.equals("/fake/Fake.class")) {
// ignore dummy class
continue;
}
// Strip leading /
ZipEntry entry = new ZipEntry(path.substring(1));
jar.putNextEntry(entry);
jar.write(file.bytes.toByteArray());
}
jar.close();
}
}
/**
* Provides a fake type to seed the compilation process with.
*/
private static class FakeJavaFileObject extends SimpleJavaFileObject {
public FakeJavaFileObject() {
super(uri("fake:///fake/Fake.java"), JavaFileObject.Kind.SOURCE);
}
@Override
public CharSequence getCharContent(boolean arg0) throws IOException {
return "package fake; interface Fake {}";
}
}
/**
* An in-memory implementation of JavaFileObject.
*/
private static class MemoryJavaFileObject extends SimpleJavaFileObject {
private ByteArrayOutputStream bytes;
private StringWriter charContents;
public MemoryJavaFileObject(URI uri, JavaFileObject.Kind kind) {
super(uri, kind);
}
@Override
public CharSequence getCharContent(boolean ignored) throws IOException {
return charContents.toString();
}
@Override
public OutputStream openOutputStream() throws IOException {
bytes = new ByteArrayOutputStream();
return bytes;
}
@Override
public Writer openWriter() throws IOException {
charContents = new StringWriter();
return charContents;
}
}
public static void main(String[] args) throws IOException {
System.exit(exec(args) ? 0 : -1);
}
/**
* A testable "main" method.
*/
public static boolean exec(String[] args) throws IOException {
return exec(args, ToolProvider.getSystemJavaCompiler());
}
public static boolean exec(String[] args, JavaCompiler compiler) throws IOException {
if (args.length < 2) {
System.err.println("java -cp requestfactory-client.jar:your_server-code.jar "
+ ValidationTool.class.getCanonicalName()
+ " (/some/directory | output.jar) com.example.shared.MyRequestFactory");
System.err.println("See "
+ "http://code.google.com/p/google-web-toolkit/wiki/RequestFactoryInterfaceValidation "
+ "for more information.");
return false;
}
if (compiler == null) {
System.err.println("This tool must be run with a JDK, not a JRE");
return false;
}
if (!compiler.getSourceVersions().contains(SourceVersion.RELEASE_6)) {
System.err.println("This tool must be run with a Java 1.6 compiler");
return false;
}
boolean clientOnly = false;
List argList = new ArrayList(Arrays.asList(args));
if (argList.get(0).equals("-client")) {
clientOnly = true;
argList.remove(0);
}
// Control how the compile process writes data to disk
JavaFileManager fileManager =
new JarOrDirectoryOutputFileManager(new File(argList.remove(0)), compiler
.getStandardFileManager(null, null, null));
// Create a validator and require it to process the specified types
RfValidator processor = new RfValidator();
if (clientOnly) {
processor.setClientOnly(true);
} else {
processor.setMustResolveAllMappings(true);
}
processor.setRootOverride(argList);
// Create the compilation task
CompilationTask task =
compiler.getTask(null, fileManager, null, null, null, Arrays
.asList(new FakeJavaFileObject()));
task.setProcessors(Arrays.asList(processor));
if (!task.call()) {
return false;
}
// Save data only on successful compilation
fileManager.close();
return true;
}
/**
* Convenience method for discarding {@link URISyntaxException}.
*/
private static URI uri(String contents) {
try {
return new URI(contents);
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
}
