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/*
 * Copyright 2002-2007 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 org.springframework.ejb.config;

import org.w3c.dom.Element;

import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractSimpleBeanDefinitionParser;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;

/**
 * Abstract base class for BeanDefinitionParsers which build
 * JNDI-locating beans, supporting an optional "jndiEnvironment"
 * bean property, populated from an "environment" XML sub-element.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 */
abstract class AbstractJndiLocatingBeanDefinitionParser extends AbstractSimpleBeanDefinitionParser {

	public static final String ENVIRONMENT = "environment";

	public static final String ENVIRONMENT_REF = "environment-ref";

	public static final String JNDI_ENVIRONMENT = "jndiEnvironment";


	protected boolean isEligibleAttribute(String attributeName) {
		return (super.isEligibleAttribute(attributeName) && !ENVIRONMENT_REF.equals(attributeName));
	}

	protected void postProcess(BeanDefinitionBuilder definitionBuilder, Element element) {
		Object envValue = DomUtils.getChildElementValueByTagName(element, ENVIRONMENT);
		if (envValue != null) {
			// Specific environment settings defined, overriding any shared properties.
			definitionBuilder.addPropertyValue(JNDI_ENVIRONMENT, envValue);
		}
		else {
			// Check whether there is a reference to shared environment properties...
			String envRef = element.getAttribute(ENVIRONMENT_REF);
			if (StringUtils.hasLength(envRef)) {
				definitionBuilder.addPropertyValue(JNDI_ENVIRONMENT, new RuntimeBeanReference(envRef));
			}
		}
	}

}




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