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/*
@ITMillApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.widgetsetutils;
import java.io.PrintWriter;
import java.util.Collection;
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.UnableToCompleteException;
import com.google.gwt.core.ext.TreeLogger.Type;
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.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.event.dd.acceptcriteria.ClientCriterion;
import com.vaadin.terminal.gwt.client.ui.dd.VAcceptCriterion;
import com.vaadin.terminal.gwt.client.ui.dd.VAcceptCriterionFactory;
/**
* GWT generator to build {@link VAcceptCriterionFactory} implementation
* dynamically based on {@link ClientCriterion} 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.terminal.gwt.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();");
Collection<Class<? extends AcceptCriterion>> clientSideVerifiableCriterion = ClassPathExplorer
.getCriterion();
for (Class<? extends AcceptCriterion> class1 : clientSideVerifiableCriterion) {
logger.log(Type.INFO, "creating mapping for "
+ class1.getCanonicalName());
String canonicalName = class1.getCanonicalName();
Class<? extends VAcceptCriterion> clientClass = class1
.getAnnotation(ClientCriterion.class).value();
sourceWriter.print("if (\"");
sourceWriter.print(canonicalName);
sourceWriter.print("\" == name) return GWT.create(");
sourceWriter.print(clientClass.getCanonicalName());
sourceWriter.println(".class );");
sourceWriter.print("else ");
}
sourceWriter.println("return null;");
sourceWriter.outdent();
sourceWriter.println("}");
}
}
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