/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.server.widgetsetutils;
import java.io.PrintWriter;
import java.util.Date;
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.TreeLogger.Type;
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 com.vaadin.client.ui.dd.VAcceptCriterion;
import com.vaadin.client.ui.dd.VAcceptCriterionFactory;
import com.vaadin.shared.ui.dd.AcceptCriterion;
/**
* GWT generator to build {@link VAcceptCriterionFactory} implementation
* dynamically based on {@link AcceptCriterion} annotations available in
* classpath.
*
*/
public class AcceptCriteriaFactoryGenerator extends Generator {
private String packageName;
private String className;
@Override
public String generate(TreeLogger logger, GeneratorContext context,
String typeName) throws UnableToCompleteException {
try {
TypeOracle typeOracle = context.getTypeOracle();
// 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) {
logger.log(TreeLogger.ERROR,
"Accept criterion factory creation failed", e);
}
// return the fully qualifed name of the class generated
return packageName + "." + className;
}
/**
* Generate source code for WidgetMapImpl
*
* @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 = null;
printWriter = context.tryCreate(logger, packageName, className);
// print writer if null, source code has ALREADY been generated,
// return (WidgetMap is equal to all permutations atm)
if (printWriter == null) {
return;
}
logger.log(Type.INFO, "Detecting available criteria ...");
Date date = new Date();
// init composer, set class properties, create source writer
ClassSourceFileComposerFactory composer = null;
composer = new ClassSourceFileComposerFactory(packageName, className);
composer.addImport("com.google.gwt.core.client.GWT");
composer.setSuperclass("com.vaadin.client.ui.dd.VAcceptCriterionFactory");
SourceWriter sourceWriter = composer.createSourceWriter(context,
printWriter);
// generator constructor source code
generateInstantiatorMethod(sourceWriter, context, logger);
// close generated class
sourceWriter.outdent();
sourceWriter.println("}");
// commit generated class
context.commit(logger, printWriter);
logger.log(Type.INFO,
"Done. (" + (new Date().getTime() - date.getTime()) / 1000
+ "seconds)");
}
private void generateInstantiatorMethod(SourceWriter sourceWriter,
GeneratorContext context, TreeLogger logger) {
sourceWriter.println("public VAcceptCriterion get(String name) {");
sourceWriter.indent();
sourceWriter.println("name = name.intern();");
JClassType criteriaType = context.getTypeOracle().findType(
VAcceptCriterion.class.getName());
for (JClassType clientClass : criteriaType.getSubtypes()) {
AcceptCriterion annotation = clientClass
.getAnnotation(AcceptCriterion.class);
if (annotation != null) {
String clientClassName = clientClass.getQualifiedSourceName();
Class<?> serverClass = clientClass.getAnnotation(
AcceptCriterion.class).value();
String serverClassName = serverClass.getCanonicalName();
logger.log(Type.INFO, "creating mapping for " + serverClassName);
sourceWriter.print("if (\"");
sourceWriter.print(serverClassName);
sourceWriter.print("\" == name) return GWT.create(");
sourceWriter.print(clientClassName);
sourceWriter.println(".class );");
sourceWriter.print("else ");
}
}
sourceWriter.println("return null;");
sourceWriter.outdent();
sourceWriter.println("}");
}
}