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

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Here is the source code for gwt.ns.webworker.rebind.NativeWorkerFactoryGenerator.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.WorkerImplNative;
import gwt.ns.webworker.linker.WorkerCompilationLinker;
import gwt.ns.webworker.linker.WorkerRequestArtifact;

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;

/**
 * Commits a request for {@link WorkerCompilationLinker} to compile a module as
 * a Worker and generates a simple class to instantiate that Worker from the
 * resulting script.
 */
public class NativeWorkerFactoryGenerator extends WorkerFactoryGenerator {
    static final String SOURCE_NAME_SUFFIX = "Native";

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

        // native worker, so request worker compilation
        WorkerRequestArtifact request = new WorkerRequestArtifact(modDef.getCanonicalName(), modDef.getName());
        context.commitArtifact(logger, request);

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

        // imports and interface
        f.addImport(Worker.class.getName());
        f.addImport(WorkerImplNative.class.getName());
        f.addImplementedInterface(sourceType.getName());

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

            // @Override
            // public Worker createAndStart() {
            //   return WorkerImplNative.create("PLACEHOLDER_PATH"); }
            // Note: placeholder path will be replaced by linker
            sw.println("@Override");
            sw.println("public Worker createAndStart() {");
            sw.indent();
            sw.print("return WorkerImplNative.create(\"");
            sw.print(request.getRelativePlaceholderUrl());
            sw.println("\");");
            sw.outdent();
            sw.println("}");

            sw.commit(logger);
        }
    }

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