/*
    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    *
    * This software is open source.
    * See the bottom of this file for the licence.
    */
   
   package org.dom4j.dom;
   
  import java.util.Map;
  
  import org.dom4j.Attribute;
  import org.dom4j.CDATA;
  import org.dom4j.Comment;
  import org.dom4j.Document;
  import org.dom4j.DocumentFactory;
  import org.dom4j.DocumentType;
  import org.dom4j.Element;
  import org.dom4j.Entity;
  import org.dom4j.Namespace;
  import org.dom4j.ProcessingInstruction;
  import org.dom4j.QName;
  import org.dom4j.Text;
  import org.dom4j.util.SingletonStrategy;
  import org.w3c.dom.DOMException;
  
  /***
   * <p>
   * <code>DOMDocumentFactory</code> is a factory of DOM4J objects which
   * implement the W3C DOM API.
   * </p>
   * 
   * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
   * @version $Revision: 1.21 $
   */
  public class DOMDocumentFactory extends DocumentFactory implements
          org.w3c.dom.DOMImplementation {
  
      /*** The Singleton instance */
      private static SingletonStrategy singleton = null;
  
      static {
          try {
              String defaultSingletonClass = "org.dom4j.util.SimpleSingleton";
              Class clazz = null;
              try {
                  String singletonClass = defaultSingletonClass;
                  singletonClass = System.getProperty(
                          "org.dom4j.dom.DOMDocumentFactory.singleton.strategy",
                          singletonClass);
                  clazz = Class.forName(singletonClass);
              } catch (Exception exc1) {
                  try {
                      String singletonClass = defaultSingletonClass;
                      clazz = Class.forName(singletonClass);
                  } catch (Exception exc2) {
                  }
              }
              singleton = (SingletonStrategy) clazz.newInstance();
              singleton.setSingletonClassName(DOMDocumentFactory.class.getName());
          } catch (Exception exc3) {
          }
      }
  
      /***
       * <p>
       * Access to the singleton instance of this factory.
       * </p>
       * 
       * @return the default singleon instance
       */
      public static DocumentFactory getInstance() {
          DOMDocumentFactory fact = (DOMDocumentFactory) singleton.instance();
          return fact;
      }
  
      // Factory methods
      public Document createDocument() {
          DOMDocument answer = new DOMDocument();
          answer.setDocumentFactory(this);
  
          return answer;
      }
  
      public DocumentType createDocType(String name, String publicId,
              String systemId) {
          return new DOMDocumentType(name, publicId, systemId);
      }
  
      public Element createElement(QName qname) {
          return new DOMElement(qname);
      }
  
      public Element createElement(QName qname, int attributeCount) {
          return new DOMElement(qname, attributeCount);
      }
  
      public Attribute createAttribute(Element owner, QName qname, String value) {
          return new DOMAttribute(qname, value);
     }
 
     public CDATA createCDATA(String text) {
         return new DOMCDATA(text);
     }
 
     public Comment createComment(String text) {
         return new DOMComment(text);
     }
 
     public Text createText(String text) {
         return new DOMText(text);
     }
 
     public Entity createEntity(String name) {
         return new DOMEntityReference(name);
     }
 
     public Entity createEntity(String name, String text) {
         return new DOMEntityReference(name, text);
     }
 
     public Namespace createNamespace(String prefix, String uri) {
         return new DOMNamespace(prefix, uri);
     }
 
     public ProcessingInstruction createProcessingInstruction(String target,
             String data) {
         return new DOMProcessingInstruction(target, data);
     }
 
     public ProcessingInstruction createProcessingInstruction(String target,
             Map data) {
         return new DOMProcessingInstruction(target, data);
     }
 
     // org.w3c.dom.DOMImplementation interface
     public boolean hasFeature(String feat, String version) {
         if ("XML".equalsIgnoreCase(feat) || "Core".equalsIgnoreCase(feat)) {
             return ((version == null) || (version.length() == 0)
                     || "1.0".equals(version) || "2.0".equals(version));
         }
 
         return false;
     }
 
     public org.w3c.dom.DocumentType createDocumentType(String qualifiedName,
             String publicId, String systemId) throws DOMException {
         return new DOMDocumentType(qualifiedName, publicId, systemId);
     }
 
     public org.w3c.dom.Document createDocument(String namespaceURI,
             String qualifiedName, org.w3c.dom.DocumentType docType)
             throws org.w3c.dom.DOMException {
         DOMDocument document;
 
         if (docType != null) {
             DOMDocumentType documentType = asDocumentType(docType);
             document = new DOMDocument(documentType);
         } else {
             document = new DOMDocument();
         }
 
         document.addElement(createQName(qualifiedName, namespaceURI));
 
         return document;
     }
 
     // Implementation methods
     protected DOMDocumentType asDocumentType(org.w3c.dom.DocumentType docType) {
         if (docType instanceof DOMDocumentType) {
             return (DOMDocumentType) docType;
         } else {
             return new DOMDocumentType(docType.getName(),
                     docType.getPublicId(), docType.getSystemId());
         }
     }
 }
 
 
 
 /*
  * Redistribution and use of this software and associated documentation
  * ("Software"), with or without modification, are permitted provided that the
  * following conditions are met:
  * 
  * 1. Redistributions of source code must retain copyright statements and
  * notices. Redistributions must also contain a copy of this document.
  * 
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  * 
  * 3. The name "DOM4J" must not be used to endorse or promote products derived
  * from this Software without prior written permission of MetaStuff, Ltd. For
  * written permission, please contact dom4j-info@metastuff.com.
  * 
  * 4. Products derived from this Software may not be called "DOM4J" nor may
  * "DOM4J" appear in their names without prior written permission of MetaStuff,
  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
  * 
  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
  * 
  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
  */