JClassScanner.java

/*
 * Copyright 2014 cruxframework.org.
 * 
 * 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 org.cruxframework.crux.core.rebind.context;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.NotFoundException;

/**
 * @author Thiago da Rosa de Bustamante
 *
 */
public class JClassScanner
{
	private GeneratorContext context;
	private Map<String, List<JClassType>> annotationsMap = null;
	
	public JClassScanner(GeneratorContext context)
    {
		this.context = context;
    }
	
	public JClassType[] searchClassesByInterface(JClassType interfaceClass)
	{
		return interfaceClass.getSubtypes();
	}
	
	public JClassType[] searchClassesByInterface(String interfaceClass) throws NotFoundException
	{
		JClassType classType = context.getTypeOracle().getType(interfaceClass);
		return classType.getSubtypes();
	}
	
	public JClassType[] searchClassesByAnnotation(Class<? extends Annotation> annotationClass)
	{
		initializeAnnotationsMap();
		List<JClassType> result = annotationsMap.get(annotationClass.getCanonicalName());
		if (result == null)
		{
			return new JClassType[0];
		}
		return result.toArray(new JClassType[result.size()]);
	}
	
	private void initializeAnnotationsMap()
	{
		if (annotationsMap == null)
		{
			annotationsMap = new HashMap<String, List<JClassType>>();
			for (JClassType type : context.getTypeOracle().getTypes()) 
			{
				Annotation[] annotations = type.getAnnotations();
				if (annotations != null)
				{
					for (Annotation annotation : annotations)
					{
						String annotationName = annotation.annotationType().getCanonicalName();
						List<JClassType> annotationsList = annotationsMap.get(annotationName);
						if (annotationsList == null)
						{
							annotationsList = new ArrayList<JClassType>();
							annotationsMap.put(annotationName, annotationsList);
						}
						annotationsList.add(type);
					}
				}
			}
		}
	}

}