gwt.g2d.resources.ExternalImageResourceGenerator.java Source code

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Here is the source code for gwt.g2d.resources.ExternalImageResourceGenerator.java

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/*
 * Copyright 2009 Hao Nguyen
 * 
 * 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.g2d.resources;

import gwt.g2d.resources.client.AbstractImageElementResource;
import gwt.g2d.resources.client.ExternalImageResource;
import gwt.g2d.resources.client.ImageElementResource;
import gwt.g2d.resources.client.ImageLoader;

import java.net.URL;

import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.resources.client.ResourceCallback;
import com.google.gwt.resources.ext.AbstractResourceGenerator;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;

/**
 * Provides the generator for {@link ExternalImageResource}
 * 
 * @author hao1300@gmail.com
 */
public final class ExternalImageResourceGenerator extends AbstractResourceGenerator {

    @Override
    public String createAssignment(TreeLogger logger, ResourceContext context, JMethod method)
            throws UnableToCompleteException {
        String name = "ExternalImageResourceGenerator.createAssignment";
        URL[] resources = ResourceGeneratorUtil.findResources(logger, context, method);

        SourceWriter sw = new StringSourceWriter();
        // Write the expression to create the subtype.
        sw.println("new " + ExternalImageResource.class.getName() + "() {");
        sw.indent();

        sw.println(String.format("public void getImage(%s<%s> callback) {", ResourceCallback.class.getName(),
                ImageElementResource.class.getName()));
        sw.indent();

        int index = 0;
        String abstractImageElementResourceClassName = AbstractImageElementResource.class.getName();
        for (URL resource : resources) {
            String outputUrlExpression = context.deploy(resource, false);
            sw.println("{");
            sw.println(abstractImageElementResourceClassName + " imgResource = new "
                    + abstractImageElementResourceClassName + "() {");

            sw.indent();

            sw.println("public String getName() {");
            sw.indent();
            sw.println("return \"" + name + "\";");
            sw.outdent();
            sw.println("}");

            sw.println("public String getBaseUrl() {");
            sw.indent();
            sw.println("return \"" + ResourceGeneratorUtil.baseName(resource) + "\";");
            sw.outdent();
            sw.println("}");

            sw.println("public int getIndex() {");
            sw.indent();
            sw.println("return " + index + ";");
            sw.outdent();
            sw.println("}");

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

            sw.println(ImageLoader.class.getName() + ".loadImageAsync(" + outputUrlExpression
                    + ", imgResource, callback);");
            sw.println("}");
            index++;
        }
        sw.outdent();
        sw.println("}");

        sw.println("public String getName() {");
        sw.indent();
        sw.println("return \"" + name + "\";");
        sw.outdent();
        sw.println("}");

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

        return sw.toString();
    }
}