renderkitbeandefinitionparser.java

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/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * 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 de.mindmatters.faces.spring.factory.xml;

import javax.faces.FactoryFinder;
import javax.faces.context.FacesContext;
import javax.faces.render.RenderKit;
import javax.faces.render.RenderKitFactory;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;

/**
 * {@link org.springframework.beans.factory.xml.BeanDefinitionParser}
 * implementation for parsing '<code>render-kit</code>' tags and creating
 * {@link RenderKit} definitions.
 * 
 * @author Andreas Kuhrwahl
 * 
 */
final class RenderKitBeanDefinitionParser implements BeanDefinitionParser {

    /**
     * {@inheritDoc}
     */
    public BeanDefinition parse(final Element element,
            final ParserContext parserContext) {
        String id = RenderKitFactory.HTML_BASIC_RENDER_KIT;
        if (element.hasAttribute(JsfBeanDefinitionParserUtils.ID_ATTRIBUTE)) {
            id = element
                    .getAttribute(JsfBeanDefinitionParserUtils.ID_ATTRIBUTE);
        }
        AbstractBeanDefinition bd = parserContext.getDelegate()
                .parseBeanDefinitionElement(element, null, null);
        if (bd != null) {
            Class beanClass = JsfBeanDefinitionParserUtils.resolveBeanClass(
                    element, bd, parserContext);
            if (beanClass == null
                    || RenderKit.class.isAssignableFrom(beanClass)) {
                if (validateRenderKitDefinition(element, bd, beanClass, id,
                        parserContext)) {
                    BeanDefinitionHolder holder = new BeanDefinitionHolder(bd,
                            id);
                    parserContext.getDelegate()
                            .decorateBeanDefinitionIfRequired(element, holder);
                    BeanDefinitionReaderUtils.registerBeanDefinition(holder,
                            parserContext.getRegistry());
                    parserContext.getReaderContext().fireComponentRegistered(
                            new BeanComponentDefinition(holder));
                }
            } else {
                parserContext.getReaderContext().error(
                        "RenderKit class is not of type "
                                + RenderKit.class.getName(), null);
            }
        }
        return null;
    }

    /**
     * Validates the {@link RenderKit} bean definition.
     * 
     * @param element
     *            the {@link Element} representing this definition
     * @param bd
     *            the {@link BeanDefinition}
     * @param beanClass
     *            the {@link RenderKit} class
     * @param renderKitId
     *            the render-kit-id
     * @param parserContext
     *            the {@link ParserContext}
     * @return <code>true</code> if the bean definition is valid
     *         <code>false</code> otherwise
     */
    private boolean validateRenderKitDefinition(final Element element,
            final AbstractBeanDefinition bd, final Class beanClass,
            final String renderKitId, final ParserContext parserContext) {
        boolean isValid = true;
        if (beanClass == null) {
            try {
                RenderKit renderKit = ((RenderKitFactory) FactoryFinder
                        .getFactory(FactoryFinder.RENDER_KIT_FACTORY))
                        .getRenderKit(FacesContext.getCurrentInstance(),
                                renderKitId);
                if (renderKit == null) {
                    isValid = false;
                } else {
                    bd.setBeanClass(renderKit.getClass());
                    bd.setLazyInit(true);
                }
            } catch (IllegalArgumentException ex) {
                isValid = false;
            }
        }
        return isValid;
    }

}