tapestry/tapestry-annotations/src/java/org/apache/tapestry/annotations/EventListenerAnnotationWorker.java

// Copyright May 14, 2006 The Apache Software Foundation
//
// 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.apache.tapestry.annotations;

import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.hivemind.Resource;
import org.apache.tapestry.enhance.EnhancementOperation;
import org.apache.tapestry.spec.IComponentSpecification;

import java.lang.reflect.Method;


/**
 * Performs {@link EventListener} annotation enhancements on components.
 *
 * @author jkuhnert
 */
public class EventListenerAnnotationWorker implements SecondaryAnnotationWorker
{
    /**
     * {@inheritDoc}
     */
    public boolean canEnhance(Method method)
    {
        return method.getAnnotation(EventListener.class) != null;
    }

    /**
     * {@inheritDoc}
     */
    public void peformEnhancement(EnhancementOperation op, IComponentSpecification spec, Method method, Resource classResource)
    {
        EventListener listener = method.getAnnotation(EventListener.class);

        String[] targets = listener.targets();
        String[] elements = listener.elements();
        String formId = listener.submitForm();
        boolean validateForm = listener.validateForm();
        boolean async = listener.async();
        boolean focus = listener.focus();
        boolean autoSubmit = listener.autoSubmit();

        if (targets.length < 1 && elements.length < 1)
            throw new ApplicationRuntimeException(AnnotationMessages.targetsNotFound(method));

        for (int i=0; i < targets.length; i++)
        {
            spec.addEventListener(targets[i], listener.events(),
                                  method.getName(), formId, validateForm, async, focus, autoSubmit);
        }

        for (int i=0; i < elements.length; i++)
        {
            spec.addElementEventListener(elements[i], listener.events(),
                                         method.getName(), formId, validateForm, async, focus);
        }
    }
}