/*
* Copyright 2008 Google 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 com.google.gwt.resources.rg;
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.DataResource.MimeType;
import com.google.gwt.resources.client.DataResource;
import com.google.gwt.resources.client.DataResource.DoNotEmbed;
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.resources.ext.SupportsGeneratorResultCaching;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;
import java.net.URL;
/**
* Provides implementations of DataResource.
*/
public final class DataResourceGenerator extends AbstractResourceGenerator
implements SupportsGeneratorResultCaching {
@Override
public String createAssignment(TreeLogger logger, ResourceContext context,
JMethod method) throws UnableToCompleteException {
URL[] resources = ResourceGeneratorUtil.findResources(logger, context,
method);
if (resources.length != 1) {
logger.log(TreeLogger.ERROR, "Exactly one resource must be specified",
null);
throw new UnableToCompleteException();
}
// Determine if a MIME Type has been specified
MimeType mimeTypeAnnotation = method.getAnnotation(MimeType.class);
String mimeType = mimeTypeAnnotation != null
? mimeTypeAnnotation.value() : null;
// Determine if resource should not be embedded
DoNotEmbed doNotEmbed = method.getAnnotation(DoNotEmbed.class);
boolean forceExternal = (doNotEmbed != null);
URL resource = resources[0];
String outputUrlExpression = context.deploy(
resource, mimeType, forceExternal);
SourceWriter sw = new StringSourceWriter();
// Write the expression to create the subtype.
sw.println("new " + DataResource.class.getName() + "() {");
sw.indent();
// Convenience when examining the generated code.
sw.println("// " + resource.toExternalForm());
sw.println("public String getUrl() {");
sw.indent();
sw.println("return " + outputUrlExpression + ";");
sw.outdent();
sw.println("}");
sw.println("public String getName() {");
sw.indent();
sw.println("return \"" + method.getName() + "\";");
sw.outdent();
sw.println("}");
sw.outdent();
sw.println("}");
return sw.toString();
}
}