org.jboss.errai.workspaces.rebind.ResourceFactoryGenerator.java Source code

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Here is the source code for org.jboss.errai.workspaces.rebind.ResourceFactoryGenerator.java

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/*
 * 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.workspaces.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.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import org.jboss.errai.bus.rebind.ScannerSingleton;
import org.jboss.errai.bus.server.service.metadata.MetaDataScanner;
import org.jboss.errai.workspaces.client.api.annotations.DefaultBundle;
import org.jboss.errai.workspaces.client.api.annotations.LoadTool;

import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class ResourceFactoryGenerator 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 Class bundleClass = null;
    private Map<String, String> tool2imageRes = new HashMap<String, String>();

    private TypeOracle typeOracle;

    // inherited generator method

    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";

            // Generate class source code
            generateClass(logger, context);
        } catch (Exception e) {

            // record sendNowWith logger that Map generation threw an exception
            logger.log(TreeLogger.ERROR, "Error generating icon factory", e);

        }

        // return the fully qualifed 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.addImport("java.util.HashMap");
        composer.addImport("java.util.Map");
        composer.addImport("org.jboss.errai.workspaces.client.api.ResourceFactory");
        composer.addImport("com.google.gwt.core.client.GWT");
        composer.addImport("com.google.gwt.resources.client.ImageResource");

        composer.addImplementedInterface("org.jboss.errai.workspaces.client.api.ResourceFactory");

        SourceWriter sourceWriter = composer.createSourceWriter(context, printWriter);

        MetaDataScanner scanner = ScannerSingleton.getOrCreateInstance();

        /**
         * Identify the default bundle (if exists, it's optional)
         */

        Set<Class<?>> bundles = scanner.getTypesAnnotatedWith(DefaultBundle.class);
        for (Class<?> clazz : bundles) {
            bundleClass = clazz.getAnnotation(DefaultBundle.class).value();
        }

        /**
         * Fetch icon mappings from LoadTool annotation This will be used to reference the icon though the ResourceFactory
         */
        Set<Class<?>> tools = scanner.getTypesAnnotatedWith(LoadTool.class);
        for (Class<?> tool : tools) {
            LoadTool lt = tool.getAnnotation(LoadTool.class);
            if (!"".equals(lt.icon()))
                tool2imageRes.put(lt.name(), lt.icon());

        }

        // generator constructor source code
        generateFactoryClass(context, logger, sourceWriter);

        // close generated class
        sourceWriter.outdent();
        sourceWriter.println("}");

        // commit generated class
        context.commit(logger, printWriter);
    }

    private void generateFactoryClass(GeneratorContext context, TreeLogger logger, SourceWriter sourceWriter) {

        sourceWriter.println("private Map<String,ImageResource> mapping = new HashMap<String,ImageResource>();");

        // start constructor source generation
        sourceWriter.println("public " + className + "() { ");
        sourceWriter.indent();
        sourceWriter.println("super();");

        if (bundleClass != null) // optional

        {
            sourceWriter.println(bundleClass.getName() + " bundle = (" + bundleClass.getName() + ") GWT.create("
                    + bundleClass.getName() + ".class);");
            for (String tool : tool2imageRes.keySet()) {
                sourceWriter.println("mapping.put(\"" + tool + "\", bundle." + tool2imageRes.get(tool) + "() );");
            }
            sourceWriter.outdent();
        } else {
            logger.log(TreeLogger.Type.WARN,
                    "\"@DefaultBundle not found. Make sure the EntryPoint refers to a valid default resource bundle.\"");
        }

        sourceWriter.println("}");

        sourceWriter.println("public ImageResource createImage(String name) { ");
        sourceWriter.outdent();
        sourceWriter.println("    return mapping.get(name);");
        sourceWriter.outdent();
        sourceWriter.println("}");

    }

}