core/src/main/java/org/apache/myfaces/extensions/validator/core/renderkit/ExtValRenderKit.java

/*
 * 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.myfaces.extensions.validator.core.renderkit;

import org.apache.myfaces.extensions.validator.internal.Priority;
import org.apache.myfaces.extensions.validator.internal.ToDo;
import org.apache.myfaces.extensions.validator.internal.UsageCategory;
import org.apache.myfaces.extensions.validator.internal.UsageInformation;

import javax.faces.event.ListenerFor;
import javax.faces.event.ListenersFor;
import javax.faces.render.RenderKit;
import javax.faces.render.RenderKitWrapper;
import javax.faces.render.Renderer;
import java.util.logging.Logger;

/**
 * @author Gerhard Petracek
 * @since 1.x.1
 */
@UsageInformation(UsageCategory.INTERNAL)
public class ExtValRenderKit extends RenderKitWrapper
{
    protected final Logger logger = Logger.getLogger(getClass().getName());
    protected RenderKit wrapped;

    public ExtValRenderKit(RenderKit wrapped)
    {
        this.wrapped = wrapped;

        logger.fine(getClass().getName() + " instantiated");
    }

    public void addRenderer(String family, String rendererType, Renderer renderer)
    {
        if (renderer instanceof ExtValRendererWrapper)
        {
            wrapped.addRenderer(family, rendererType, renderer);
        }
        else
        {
            wrapped.addRenderer(family, rendererType, createWrapper(renderer));
        }
    }

    public Renderer getRenderer(String family, String rendererType)
    {
        Renderer renderer = wrapped.getRenderer(family, rendererType);

        if(renderer != null)
        {
            return renderer instanceof ExtValRendererWrapper ? renderer : createWrapper(renderer);
        }

        return renderer;
    }

    @UsageInformation(UsageCategory.REUSE)
    @ToDo(value = Priority.HIGH, description = "log warning + hint that a (generic) component support module is needed")
    protected Renderer createWrapper(Renderer renderer)
    {
        if(renderer == null)
        {
            return null;
        }

        if(renderer.getClass().isAnnotationPresent(ListenerFor.class) ||
                renderer.getClass().isAnnotationPresent(ListenersFor.class))
        {
            //we aren't allowed to create a wrapper without knowing details about the renderer or
            //without generating a proxy due to the annotation scanning process
            return renderer;
        }
        return new ExtValRendererWrapper(renderer);
    }

    @Override
    public RenderKit getWrapped()
    {
        return this.wrapped;
    }
}