attributebeandefinitiondecorator.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.aspectj;

import org.springframework.beans.PropertyValue;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.support.ManagedMap;
import org.springframework.beans.factory.xml.BeanDefinitionDecorator;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.beans.factory.xml.XmlReaderContext;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * {@link org.springframework.beans.factory.xml.BeanDefinitionDecorator}
 * implementation for parsing '<code>attribute</code>' tags.
 * 
 * @author Andreas Kuhrwahl
 * 
 */
final class AttributeBeanDefinitionDecorator implements BeanDefinitionDecorator {

    /**
     * {@inheritDoc}
     */
    public BeanDefinitionHolder decorate(final Node node,
            final BeanDefinitionHolder definition,
            final ParserContext parserContext) {
        Assert.isInstanceOf(Element.class, node);
        Element attributeElement = (Element) node;
        PropertyValue attributes = definition.getBeanDefinition()
                .getPropertyValues().getPropertyValue("attributes");
        if (attributes == null) {
            ManagedMap attributeMap = new ManagedMap();
            attributeMap.setMergeEnabled(true);
            attributeMap.setSource(parserContext
                    .extractSource(attributeElement));
            attributes = new PropertyValue("attributes", attributeMap);
            attributes.setSource(parserContext.extractSource(attributeElement));
            definition.getBeanDefinition().getPropertyValues()
                    .addPropertyValue(attributes);
        }
        parseAttribute(attributeElement, definition, attributes,
                (ManagedMap) attributes.getValue(), parserContext);
        return definition;
    }

    /**
     * Parse an attribute.
     * 
     * @param attribute
     *            the representation of an attribute
     * @param definition
     *            the {@link BeanDefinitionHolder}
     * @param attributes
     *            the {@link PropertyValue}
     * @param attributeMap
     *            the attribute map
     * @param parserContext
     *            the {@link ParserContext}
     */
    private void parseAttribute(final Element attribute,
            final BeanDefinitionHolder definition,
            final PropertyValue attributes, final ManagedMap attributeMap,
            final ParserContext parserContext) {
        XmlReaderContext readerContext = parserContext.getReaderContext();
        String attributeName = attribute
                .getAttribute(JsfBeanDefinitionParserUtils.NAME_ATTRIBUTE);
        if (!StringUtils.hasLength(attributeName)) {
            readerContext.error("Tag 'attribute' must have a 'name' attribute",
                    readerContext.extractSource(attribute));
            return;
        }
        Object val = parserContext.getDelegate().parsePropertyValue(attribute,
                definition.getBeanDefinition(), attributeName);
        attributeMap.put(attributeName, val);
        parserContext.getDelegate().parseMetaElements(attribute, attributes);
    }

}