/*
    * 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.datatype;
   
  import com.sun.msv.datatype.DatabindableDatatype;
  import com.sun.msv.datatype.SerializationContext;
  import com.sun.msv.datatype.xsd.XSDatatype;
  
  import org.dom4j.Element;
  import org.dom4j.Namespace;
  import org.dom4j.Node;
  import org.dom4j.QName;
  import org.dom4j.tree.DefaultElement;
  
  import org.relaxng.datatype.DatatypeException;
  import org.relaxng.datatype.ValidationContext;
  
  /***
   * <p>
   * <code>DatatypeElement</code> represents an Element which supports the <a
   * href="http://www.w3.org/TR/xmlschema-2/">XML Schema Data Types </a>
   * specification.
   * </p>
   * 
   * @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
   * @version $Revision: 1.9 $
   */
  public class DatatypeElement extends DefaultElement implements
          SerializationContext, ValidationContext {
      /*** The <code>XSDatatype</code> of the <code>Attribute</code> */
      private XSDatatype datatype;
  
      /*** The data (Object) value of the <code>Attribute</code> */
      private Object data;
  
      public DatatypeElement(QName qname, XSDatatype datatype) {
          super(qname);
          this.datatype = datatype;
      }
  
      public DatatypeElement(QName qname, int attributeCount, XSDatatype type) {
          super(qname, attributeCount);
          this.datatype = type;
      }
  
      public String toString() {
          return getClass().getName() + hashCode() + " [Element: <"
                  + getQualifiedName() + " attributes: " + attributeList()
                  + " data: " + getData() + " />]";
      }
  
      /***
       * Returns the MSV XSDatatype for this node
       * 
       * @return DOCUMENT ME!
       */
      public XSDatatype getXSDatatype() {
          return datatype;
      }
  
      // SerializationContext interface
      // -------------------------------------------------------------------------
      public String getNamespacePrefix(String uri) {
          Namespace namespace = getNamespaceForURI(uri);
  
          return (namespace != null) ? namespace.getPrefix() : null;
      }
  
      // ValidationContext interface
      // -------------------------------------------------------------------------
      public String getBaseUri() {
          // XXXX: could we use a Document for this?
          return null;
      }
  
      public boolean isNotation(String notationName) {
          // XXXX: no way to do this yet in dom4j so assume false
          return false;
      }
  
      public boolean isUnparsedEntity(String entityName) {
          // XXXX: no way to do this yet in dom4j so assume valid
          return true;
      }
  
      public String resolveNamespacePrefix(String prefix) {
          Namespace namespace = getNamespaceForPrefix(prefix);
  
          if (namespace != null) {
              return namespace.getURI();
          }
  
          return null;
      }
 
     // Element interface
     // -------------------------------------------------------------------------
     public Object getData() {
         if (data == null) {
             String text = getTextTrim();
 
             if ((text != null) && (text.length() > 0)) {
                 if (datatype instanceof DatabindableDatatype) {
                     DatabindableDatatype bind = (DatabindableDatatype) datatype;
                     data = bind.createJavaObject(text, this);
                 } else {
                     data = datatype.createValue(text, this);
                 }
             }
         }
 
         return data;
     }
 
     public void setData(Object data) {
         String s = datatype.convertToLexicalValue(data, this);
         validate(s);
         this.data = data;
         setText(s);
     }
 
     public Element addText(String text) {
         validate(text);
 
         return super.addText(text);
     }
 
     public void setText(String text) {
         validate(text);
         super.setText(text);
     }
 
     // Implementation methods
     // -------------------------------------------------------------------------
 
     /***
      * Override to force lazy recreation of data object
      * 
      * @param node
      *            DOCUMENT ME!
      */
     protected void childAdded(Node node) {
         data = null;
         super.childAdded(node);
     }
 
     /***
      * Override to force lazy recreation of data object
      * 
      * @param node
      *            DOCUMENT ME!
      */
     protected void childRemoved(Node node) {
         data = null;
         super.childRemoved(node);
     }
 
     protected void validate(String text) throws IllegalArgumentException {
         try {
             datatype.checkValid(text, this);
         } catch (DatatypeException e) {
             throw new IllegalArgumentException(e.getMessage());
         }
     }
 }
 
 /*
  * 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.
  */