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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tuscany.sca.implementation.java.introspect.impl;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.implementation.java.IntrospectionException;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.implementation.java.impl.JavaElementImpl;
import org.apache.tuscany.sca.implementation.java.impl.JavaResourceImpl;
import org.osoa.sca.annotations.ConversationID;

/**
 * Processes {@link @ConversationID} annotations on a component implementation and adds
 * a {@link JavaMappedProperty} to the component type which will be used to
 * inject the appropriate conversationId
 *
 * @version $Rev$ $Date$
 */
public class ConversationIDProcessor extends BaseJavaClassVisitor {
    
    public ConversationIDProcessor(AssemblyFactory factory) {
        super(factory);
    }

    @Override
    public void visitMethod(Method method, JavaImplementation type) throws IntrospectionException {
        if (method.getAnnotation(ConversationID.class) == null) {
            return;
        }
        if (method.getParameterTypes().length != 1) {
            throw new IllegalContextException("ConversationID setter must have one parameter", method);
        }
        String name = JavaIntrospectionHelper.toPropertyName(method.getName());
        JavaElementImpl element = new JavaElementImpl(method, 0);
        element.setName(name);
        element.setClassifer(org.apache.tuscany.sca.implementation.java.introspect.impl.Resource.class);
        JavaResourceImpl resource = new JavaResourceImpl(element);
        type.getResources().put(resource.getName(), resource);
    }

    @Override
    public void visitField(Field field, JavaImplementation type) throws IntrospectionException {
        if (field.getAnnotation(ConversationID.class) == null) {
            return;
        }
        JavaElementImpl element = new JavaElementImpl(field);
        element.setClassifer(org.apache.tuscany.sca.implementation.java.introspect.impl.Resource.class);
        JavaResourceImpl resource = new JavaResourceImpl(element);
        type.getResources().put(resource.getName(), resource);
    }
}