jee-modules/jsf-module/impl/src/main/java/org/apache/myfaces/extensions/cdi/jsf/impl/scope/conversation/CodiRenderKitFactory.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.cdi.jsf.impl.scope.conversation;

import org.apache.myfaces.extensions.cdi.core.api.activation.Deactivatable;
import org.apache.myfaces.extensions.cdi.core.api.startup.CodiStartupBroadcaster;
import org.apache.myfaces.extensions.cdi.core.impl.util.ClassDeactivation;
import org.apache.myfaces.extensions.cdi.core.impl.util.CodiUtils;
import org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.spi.RenderKitWrapperFactory;

import javax.faces.context.FacesContext;
import javax.faces.render.RenderKit;
import javax.faces.render.RenderKitFactory;
import java.util.Iterator;

/**
 * !!!keep in sync with org.apache.myfaces.extensions.cdi.jsf2.impl.scope.conversation.CodiRenderKitFactory!!!
 */
public class CodiRenderKitFactory extends RenderKitFactory implements Deactivatable
{
    private RenderKitFactory wrapped;
    private RenderKitWrapperFactory renderKitWrapperFactory;

    private volatile Boolean initialized;
    private final boolean deactivated;

    /**
     * Constructor for wrapping the given {@link RenderKitFactory}
     * @param wrapped render-kit-factory which will be wrapped
     */
    public CodiRenderKitFactory(RenderKitFactory wrapped)
    {
        this.wrapped = wrapped;
        this.deactivated = !isActivated();

        if(!this.deactivated)
        {
            this.renderKitWrapperFactory = CodiUtils.lookupFromEnvironment(RenderKitWrapperFactory.class);
        }
    }

    /**
     * {@inheritDoc}
     */
    public void addRenderKit(String s, RenderKit renderKit)
    {
        wrapped.addRenderKit(s, renderKit);
    }

    /**
     * Creates an intercepted {@link RenderKit} in order to wrap the {@link javax.faces.context.ResponseWriter}
     *
     * {@inheritDoc}
     */
    public RenderKit getRenderKit(FacesContext facesContext, String s)
    {
        RenderKit renderKit = wrapped.getRenderKit(facesContext, s);

        if (renderKit == null)
        {
            return null;
        }

        if(this.deactivated)
        {
            return renderKit;
        }

        //workaround for mojarra

        if(this.initialized == null)
        {
            lazyInit();
        }

        if(this.renderKitWrapperFactory != null)
        {
            return this.renderKitWrapperFactory.create(renderKit);
        }

        return new InterceptedRenderKit(renderKit);
    }

    private synchronized void lazyInit()
    {
        // switch into paranoia mode
        if(this.initialized != null)
        {
            return;
        }

        if(this.renderKitWrapperFactory == null)
        {
            //workaround for mojarra
            CodiStartupBroadcaster.broadcastStartup();

            if(CodiUtils.isCdiInitialized())
            {
                this.renderKitWrapperFactory = CodiUtils
                        .getContextualReferenceByClass(RenderKitWrapperFactory.class, true);
            }
        }

        if(CodiUtils.isCdiInitialized())
        {
            this.initialized = true;
        }
    }

    /**
     * {@inheritDoc}
     */
    public Iterator<String> getRenderKitIds()
    {
        return wrapped.getRenderKitIds();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isActivated()
    {
        return ClassDeactivation.isClassActivated(getClass());
    }
}