/*
    * Copyright 2001-2004 (C) MetaStuff, Ltd. All Rights Reserved.
    * 
    * This software is open source. 
    * See the bottom of this file for the licence.
    * 
    * $Id: DatatypeElement.java,v 1.7 2004/06/25 08:03:34 maartenc Exp $
    */
   
  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: 1.7 $
    */
  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 datatype) { 
          super(qname, attributeCount);
          this.datatype = datatype;
      }
  
      public String toString() {
          return getClass().getName() + hashCode() 
              + " [Element: <" + getQualifiedName() 
              + " attributes: " + attributeList() 
              + " data: " + getData() + " />]";
      }
      
      /*** Returns the MSV XSDatatype for this node */
      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 bindable = (DatabindableDatatype) datatype;
                     data = bindable.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 */
     protected void childAdded(Node node) {
         data = null;
         super.childAdded(node);
     }
     
     /*** Override to force lazy recreation of data object */    
     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 2001-2004 (C) MetaStuff, Ltd. All Rights Reserved.
  *
  * $Id: DatatypeElement.java,v 1.7 2004/06/25 08:03:34 maartenc Exp $
  */