/*
* 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();
}
}