/*
* Copyright 2010 JBoss, a divison Red Hat, 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 org.jboss.errai.bus.rebind;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.json.client.*;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import org.jboss.errai.bus.client.ext.ExtensionsLoader;
import org.jboss.errai.bus.client.framework.MessageBus;
import org.jboss.errai.bus.server.annotations.ExtensionComponent;
import org.jboss.errai.bus.server.service.metadata.MetaDataScanner;
import java.io.PrintWriter;
import java.util.Set;
public class ExtensionProxyGenerator extends Generator {
/**
* Simple name of class to be generated
*/
private String className = null;
/**
* Package name of class to be generated
*/
private String packageName = null;
private TypeOracle typeOracle;
@Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName)
throws UnableToCompleteException {
typeOracle = context.getTypeOracle();
try {
// get classType and save instance variables
JClassType classType = typeOracle.getType(typeName);
packageName = classType.getPackage().getName();
className = classType.getSimpleSourceName() + "Impl";
logger.log(TreeLogger.INFO, "Generating Extensions Bootstrapper...");
// Generate class source code
generateClass(logger, context);
}
catch (Throwable e) {
// record that Map generation threw an exception
e.printStackTrace();
logger.log(TreeLogger.ERROR, "Error generating extensions", e);
}
// return the fully qualified name of the class generated
return packageName + "." + className;
}
/**
* Generate source code for new class. Class extends
* <code>HashMap</code>.
*
* @param logger Logger object
* @param context Generator context
*/
private void generateClass(TreeLogger logger, GeneratorContext context) {
// get print writer that receives the source code
PrintWriter printWriter = context.tryCreate(logger, packageName, className);
// print writer if null, source code has ALREADY been generated,
if (printWriter == null) return;
// init composer, set class properties, create source writer
ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(packageName,
className);
composer.addImplementedInterface(ExtensionsLoader.class.getName());
composer.addImport(JSONValue.class.getName());
composer.addImport(JSONString.class.getName());
composer.addImport(JSONNumber.class.getName());
composer.addImport(JSONBoolean.class.getName());
composer.addImport(JSONObject.class.getName());
SourceWriter sourceWriter = composer.createSourceWriter(context, printWriter);
// generator constructor source code
generateExtensions(context, logger, sourceWriter);
// close generated class
sourceWriter.outdent();
sourceWriter.println("}");
// commit generated class
context.commit(logger, printWriter);
}
private void generateExtensions(GeneratorContext context, TreeLogger logger, SourceWriter sourceWriter) {
// start constructor source generation
sourceWriter.println("public " + className + "() { ");
sourceWriter.indent();
sourceWriter.println("super();");
sourceWriter.outdent();
sourceWriter.println("}");
sourceWriter.println("public void initExtensions(final " + MessageBus.class.getName() + " bus) { ");
sourceWriter.outdent();
MetaDataScanner scanner = ScannerSingleton.getOrCreateInstance();
new BusClientConfigGenerator().generate(context, logger, sourceWriter, scanner, typeOracle);
Set<Class<?>> extensionComponents = scanner.getTypesAnnotatedWith(ExtensionComponent.class);
for (Class<?> cls : extensionComponents) {
if (ExtensionGenerator.class.isAssignableFrom(cls)) {
try {
ExtensionGenerator generator = cls.asSubclass(ExtensionGenerator.class).newInstance();
generator.generate(context, logger, sourceWriter, scanner, typeOracle);
}
catch (Exception e) {
throw new RuntimeException("Could not load extension generator: " + cls.getName(), e);
}
}
}
// end constructor source generation
sourceWriter.outdent();
sourceWriter.println("}");
}
}