JAXBSupport xref

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    1   /*
    2    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    3    *
    4    * This software is open source.
    5    * See the bottom of this file for the licence.
    6    */
    7
    8   package org.dom4j.jaxb;
    9
    10  import java.io.StringReader;
    11
    12  import javax.xml.bind.JAXBContext;
    13  import javax.xml.bind.JAXBException;
    14  import javax.xml.bind.Marshaller;
    15  import javax.xml.bind.Unmarshaller;
    16  import javax.xml.transform.Source;
    17  import javax.xml.transform.stream.StreamSource;
    18
    19  import org.dom4j.dom.DOMDocument;
    20
    21  /***
    22   * DOCUMENT ME!
    23   *
    24   * @author Wonne Keysers (Realsoftware.be)
    25   */
    26  abstract class JAXBSupport {
    27      private String contextPath;
    28
    29      private ClassLoader classloader;
    30
    31      private JAXBContext jaxbContext;
    32
    33      private Marshaller marshaller;
    34
    35      private Unmarshaller unmarshaller;
    36
    37      public JAXBSupport(String contextPath) {
    38          this.contextPath = contextPath;
    39      }
    40
    41      public JAXBSupport(String contextPath, ClassLoader classloader) {
    42          this.contextPath = contextPath;
    43          this.classloader = classloader;
    44      }
    45
    46      /***
    47       * Marshals the given {@link javax.xml.bind.Element}in to its DOM4J
    48       * counterpart.
    49       *
    50       * @param element
    51       *            JAXB Element to be marshalled
    52       *
    53       * @return the marshalled DOM4J {@link org.dom4j.Element}
    54       *
    55       * @throws JAXBException
    56       *             when an error occurs
    57       */
    58      protected org.dom4j.Element marshal(javax.xml.bind.Element element)
    59              throws JAXBException {
    60          DOMDocument doc = new DOMDocument();
    61          getMarshaller().marshal(element, doc);
    62
    63          return doc.getRootElement();
    64      }
    65
    66      /***
    67       * Unmarshalls the specified DOM4J {@link org.dom4j.Element}into a {@link
    68       * javax.xml.bind.Element}
    69       *
    70       * @param element
    71       *            the DOM4J element to unmarshall
    72       *
    73       * @return the unmarshalled JAXB object
    74       *
    75       * @throws JAXBException
    76       *             when an error occurs
    77       */
    78      protected javax.xml.bind.Element unmarshal(org.dom4j.Element element)
    79              throws JAXBException {
    80          Source source = new StreamSource(new StringReader(element.asXML()));
    81
    82          return (javax.xml.bind.Element) getUnmarshaller().unmarshal(source);
    83      }
    84
    85      private Marshaller getMarshaller() throws JAXBException {
    86          if (marshaller == null) {
    87              marshaller = getContext().createMarshaller();
    88          }
    89
    90          return marshaller;
    91      }
    92
    93      private Unmarshaller getUnmarshaller() throws JAXBException {
    94          if (unmarshaller == null) {
    95              unmarshaller = getContext().createUnmarshaller();
    96          }
    97
    98          return unmarshaller;
    99      }
    100
    101     private JAXBContext getContext() throws JAXBException {
    102         if (jaxbContext == null) {
    103             if (classloader == null) {
    104                 jaxbContext = JAXBContext.newInstance(contextPath);
    105             } else {
    106                 jaxbContext = JAXBContext.newInstance(contextPath, classloader);
    107             }
    108         }
    109
    110         return jaxbContext;
    111     }
    112 }
    113
    114 /*
    115  * Redistribution and use of this software and associated documentation
    116  * ("Software"), with or without modification, are permitted provided that the
    117  * following conditions are met:
    118  *
    119  * 1. Redistributions of source code must retain copyright statements and
    120  * notices. Redistributions must also contain a copy of this document.
    121  *
    122  * 2. Redistributions in binary form must reproduce the above copyright notice,
    123  * this list of conditions and the following disclaimer in the documentation
    124  * and/or other materials provided with the distribution.
    125  *
    126  * 3. The name "DOM4J" must not be used to endorse or promote products derived
    127  * from this Software without prior written permission of MetaStuff, Ltd. For
    128  * written permission, please contact dom4j-info@metastuff.com.
    129  *
    130  * 4. Products derived from this Software may not be called "DOM4J" nor may
    131  * "DOM4J" appear in their names without prior written permission of MetaStuff,
    132  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
    133  *
    134  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
    135  *
    136  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
    137  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    138  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    139  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
    140  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    141  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    142  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    143  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    144  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    145  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    146  * POSSIBILITY OF SUCH DAMAGE.
    147  *
    148  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    149  */