gwt.ns.webworker.rebind.EmulatedWorkerFactoryGenerator.java Source code

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Here is the source code for gwt.ns.webworker.rebind.EmulatedWorkerFactoryGenerator.java

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/*
 * Copyright 2010 Brendan Kenny
 * 
 * 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 gwt.ns.webworker.rebind;

import gwt.ns.webworker.client.Worker;
import gwt.ns.webworker.client.WorkerImplProxy;

import java.io.PrintWriter;

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.dev.cfg.ModuleDef;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;

/**
 * Generates a simple class that wraps the entry point class in a
 * Worker-emulating proxy and returns that proxy. No request artifact is
 * emitted because no module needs to be compiled.
 */
public class EmulatedWorkerFactoryGenerator extends WorkerFactoryGenerator {
    static final String SOURCE_NAME_SUFFIX = "Emulated";

    @Override
    public void generateWorkerFactory(TreeLogger logger, GeneratorContext context, JClassType sourceType,
            String genName, PrintWriter out, ModuleDef modDef, JClassType workerEntryType)
            throws UnableToCompleteException {

        ClassSourceFileComposerFactory f = new ClassSourceFileComposerFactory(sourceType.getPackage().getName(),
                genName);

        // imports and interface
        f.addImport(Worker.class.getName());
        f.addImport(WorkerImplProxy.class.getName());
        f.addImport(workerEntryType.getQualifiedSourceName());
        f.addImplementedInterface(sourceType.getName());

        // new generated source file
        SourceWriter sw = f.createSourceWriter(context, out);

        // @Override
        // public Worker createAndStart() {
        //  WorkerImplProxy proxy = new WorkerImplProxy(new RationalsWorker());
        //  return proxy;
        // }
        sw.println("@Override");
        sw.println("public Worker createAndStart() {");
        sw.indent();

        sw.print("WorkerImplProxy proxy = new WorkerImplProxy(new ");
        sw.print(workerEntryType.getSimpleSourceName());
        sw.println("());");
        sw.println("return proxy;");

        sw.outdent();
        sw.println("}");

        sw.commit(logger);
    }

    @Override
    public String getSourceSuffix() {
        return SOURCE_NAME_SUFFIX;
    }
}