ActiveMQBeanDefinitionReader xref

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    1   /***
    2    *
    3    * Copyright 2004 Protique Ltd
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.codehaus.activemq.spring;
    19
    20  import org.springframework.beans.BeansException;
    21  import org.springframework.beans.factory.support.BeanDefinitionRegistry;
    22  import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
    23  import org.springframework.core.io.ClassPathResource;
    24  import org.springframework.core.io.Resource;
    25  import org.w3c.dom.Document;
    26  import org.xml.sax.EntityResolver;
    27
    28  import javax.xml.transform.Source;
    29  import javax.xml.transform.Transformer;
    30  import javax.xml.transform.TransformerConfigurationException;
    31  import javax.xml.transform.TransformerException;
    32  import javax.xml.transform.TransformerFactory;
    33  import javax.xml.transform.URIResolver;
    34  import javax.xml.transform.dom.DOMResult;
    35  import javax.xml.transform.dom.DOMSource;
    36  import javax.xml.transform.stream.StreamSource;
    37  import java.io.IOException;
    38
    39  /***
    40   * @version $Revision: 1.2 $
    41   */
    42  public class ActiveMQBeanDefinitionReader extends XmlBeanDefinitionReader {
    43      private String brokerName;
    44
    45      public ActiveMQBeanDefinitionReader(BeanDefinitionRegistry beanDefinitionRegistry, String brokerName) {
    46          super(beanDefinitionRegistry);
    47          this.brokerName = brokerName;
    48          setEntityResolver(createEntityResolver());
    49      }
    50
    51      public int registerBeanDefinitions(Document document, Resource resource) throws BeansException {
    52          try {
    53              Document newDocument = transformDocument(document);
    54              return super.registerBeanDefinitions(newDocument, resource);
    55          }
    56          catch (Exception e) {
    57              throw new ConfigurationParseException(resource, e);
    58          }
    59      }
    60
    61      public static Transformer createTransformer(Source source) throws TransformerConfigurationException {
    62          TransformerFactory factory = TransformerFactory.newInstance();
    63          Transformer transformer = factory.newTransformer(source);
    64          transformer.setURIResolver(new URIResolver() {
    65              public Source resolve(String href, String base) {
    66                  System.out.println("Called with href:  " + href + " base: " + base);
    67                  return null;
    68              }
    69          });
    70          return transformer;
    71      }
    72
    73
    74      // Properties
    75      //-------------------------------------------------------------------------
    76      public String getBrokerName() {
    77          return brokerName;
    78      }
    79
    80      public void setBrokerName(String brokerName) {
    81          this.brokerName = brokerName;
    82      }
    83
    84      // Implementation methods
    85      //-------------------------------------------------------------------------
    86
    87      /***
    88       * A hook to transform the source document into a default Spring XML configuration
    89       *
    90       * @param document
    91       * @return
    92       */
    93      protected Document transformDocument(Document document) throws IOException, TransformerException {
    94          Transformer transformer = createTransformer(createXslSource());
    95          transformer.setParameter("brokerName", getBrokerName());
    96          DOMResult result = new DOMResult();
    97          transformer.transform(new DOMSource(document), result);
    98          return (Document) result.getNode();
    99      }
    100
    101     /***
    102      * Creates the XSL resource for the transformation
    103      *
    104      * @return
    105      */
    106     protected Source createXslSource() throws IOException {
    107         return new StreamSource(getXslResource().getInputStream(), getXslResource().getURL().toString());
    108     }
    109
    110     /***
    111      * @return the resource to use for the XSLT
    112      */
    113     protected ClassPathResource getXslResource() {
    114         return new ClassPathResource("org/codehaus/activemq/activemq-to-spring.xsl");
    115     }
    116
    117     /***
    118      * @return a new EnittyResolver
    119      */
    120     protected EntityResolver createEntityResolver() {
    121         return new ActiveMQDtdResolver();
    122     }
    123 }