/*
 * Copyright 2002-2011 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.flex.config.xml;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.flex.messaging.MessageDestinationFactory;
import org.springframework.flex.messaging.jms.JmsAdapter;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

/**
 * {@link BeanDefinitionParser} implementation for parsing the <code>jms-message-destination</code> element.
 * 
 * <p>
 * Configures the {@link MessageDestinationFactory} bean definition with the appropriate {@link JmsAdapter} class for
 * connecting to JMS destinations.
 * 
 * @author Mark Fisher
 * @author Jeremy Grelle
 */
public class JmsMessageDestinationBeanDefinitionParser extends AbstractMessageDestinationBeanDefinitionParser {

    // --------------------------- Full qualified class names ----------------//
    private static final String JMS_ADAPTER_CLASS_NAME = "org.springframework.flex.messaging.jms.JmsAdapter";

    // --------------------------- XML Config Attributes ---------------------//
    private static final String CONNECTION_FACTORY_ATTR = "connection-factory";

    private static final String JMS_DESTINATION_ATTR = "jms-destination";

    private static final String TOPIC_NAME_ATTR = "topic-name";

    private static final String QUEUE_NAME_ATTR = "queue-name";

    private static final String DESTINATION_RESOLVER_ATTR = "destination-resolver";

    private static final String MESSAGE_CONVERTER_ATTR = "message-converter";

    private static final String TRANSACTION_MANAGER_ATTR = "transaction-manager";

    // --------------------------- Bean Configuration Properties -------------//
    private static final String SERVICE_ADAPTER_PROPERTY = "serviceAdapter";

    private static final String CONNECTION_FACTORY_PROPERTY = "connectionFactory";

    // --------------------------- Default Values ----------------------------//
    private static final String DEFAULT_CONNECTION_FACTORY_REF = "connectionFactory";

    /**
     * 
     * {@inheritDoc}
     */
    @Override
    protected void parseAdapter(Element element, ParserContext parserContext, BeanDefinitionBuilder destinationBuilder) {
        BeanDefinitionBuilder adapterBuilder = BeanDefinitionBuilder.genericBeanDefinition(JMS_ADAPTER_CLASS_NAME);

        int count = ParsingUtils.countProvidedAttributeValues(element, JMS_DESTINATION_ATTR, QUEUE_NAME_ATTR, TOPIC_NAME_ATTR);
        if (count != 1) {
            parserContext.getReaderContext().error("exactly one of 'jms-destination', 'queue-name', or 'topic-name' is required", element);
            return;
        }

        String connectionFactoryId = element.getAttribute(CONNECTION_FACTORY_ATTR);
        connectionFactoryId = StringUtils.hasText(connectionFactoryId) ? connectionFactoryId : DEFAULT_CONNECTION_FACTORY_REF;
        adapterBuilder.addPropertyReference(CONNECTION_FACTORY_PROPERTY, connectionFactoryId);

        ParsingUtils.mapOptionalBeanRefAttributes(element, adapterBuilder, parserContext, JMS_DESTINATION_ATTR, DESTINATION_RESOLVER_ATTR,
            MESSAGE_CONVERTER_ATTR, TRANSACTION_MANAGER_ATTR);
        ParsingUtils.mapOptionalAttributes(element, parserContext, adapterBuilder, QUEUE_NAME_ATTR, TOPIC_NAME_ATTR);

        String serviceAdapterId = ParsingUtils.registerInfrastructureComponent(element, parserContext, adapterBuilder);
        destinationBuilder.addPropertyValue(SERVICE_ADAPTER_PROPERTY, serviceAdapterId);
    }

}