structureddocumentutils.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 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 end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``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 SUN MICROSYSTEMS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: StructuredDocumentUtils.java,v 1.2 2002/03/04 20:18:17 echtcherbina Exp $
 */

package net.jxta.document;

import java.util.Enumeration;

/**
 *  Provides a number of static utility members which are helpful in
 *  manipluating StructuredDocuments.
 *
 *  @since JXTA 1.0
 *  @version $Revision: 1.2 $
 **/
final public class StructuredDocumentUtils {
    
    /**
     * Recursively copy children elements of <code>from</code> into the
     * the element <code>intoElement</code> of document <code>intoDoc</code>.
     *
     * <p/><b>BEWARE</b> that this does NOT copy the TEXTVALUE (if any) of the
     * <code>fromParent</code> element, ONLY CHILDREN. All other elements
     * are fully copied, including their textValue.
     *
     * <p/>It is not possible to copy a textValue in an existing element.
     *
     * @param intoDoc  the document into which the elements will be
     * copied.
     * @param intoElement  the element which will serve as the parent for
     * the elements being copied.
     * @param from the parent element of the elements which will be
     * copied.
     */
    public static void copyChildren( StructuredDocument intoDoc,
    Element intoElement, Element from ) {
        
        for( Enumeration eachChild = from.getChildren();
        eachChild.hasMoreElements(); ) {
            
            Element aChild = (Element) eachChild.nextElement();
            Element newElement = intoDoc.createElement( aChild.getKey(),
            aChild.getValue() );
            intoElement.appendChild( newElement );
            
            // copy attributes if any
            if( (aChild instanceof Attributable) &&
            (newElement instanceof Attributable) ) {
                Enumeration eachAttrib = ((Attributable)aChild).getAttributes();
                
                while( eachAttrib.hasMoreElements() ) {
                    Attribute anAttrib = (Attribute) eachAttrib.nextElement();
                    
                    ((Attributable)newElement).addAttribute(
                    anAttrib.getName(), anAttrib.getValue() );
                }
            }
            
            // recurse to add the children.
            copyChildren( intoDoc, newElement, aChild );
        }
    }
    
    /**
     *  Recursively copy elements beginnging with <code>from</code> into the
     *  document identified by <code>intoDoc</code>.
     *
     *  @param intoDoc  the document into which the elements which will be
     *  copied.
     *  @param intoElement  the element which will serve as the parent for
     *  the elements being copied.
     *  @param from the root element of the hierarchy which will be copied.
     *
     **/
    public static void copyElements( StructuredDocument intoDoc, Element intoElement, Element from ) {
        
        Element newElement = intoDoc.createElement( from.getKey(),
        from.getValue() );
        
        intoElement.appendChild( newElement );
        
        // copy attributes if any
        if( (from instanceof Attributable) &&
        (newElement instanceof Attributable) ) {
            Enumeration eachAttrib = ((Attributable)from).getAttributes();
            
            while( eachAttrib.hasMoreElements() ) {
                Attribute anAttrib = (Attribute) eachAttrib.nextElement();
                
                ((Attributable)newElement).addAttribute(
                anAttrib.getName(), anAttrib.getValue() );
            }
        }
        
        StructuredDocumentUtils.copyChildren( intoDoc, newElement, from );
    }
    
    /**
     * copies the given element or document into a standalone document of
     * same encoding, using the element's name as the document type and
     * recursively copying all elements textValues and children to the new
     * document.
     * The copy of the given element is the root of the new document.
     *
     * @return StructuredDocument the copy
     * @param from the root element from which to begin copying.
     */
    public static StructuredDocument copyAsDocument( Element from ) {
        
        StructuredDocument result;
        if (from.getValue() == null) {
            result =
            StructuredDocumentFactory.newStructuredDocument
            (from.getRoot().getMimeType(),
            from.getKey().toString());
        } else {
            result = StructuredDocumentFactory.newStructuredDocument
            (from.getRoot().getMimeType(),
            from.getKey().toString(),
            from.getValue().toString());
        }
        
        // copy attributes if any
        if( (from instanceof Attributable) &&
        (result instanceof Attributable) ) {
            Enumeration eachAttrib = ((Attributable)from).getAttributes();
            
            while( eachAttrib.hasMoreElements() ) {
                Attribute anAttrib = (Attribute) eachAttrib.nextElement();
                
                ((Attributable)result).addAttribute(
                anAttrib.getName(), anAttrib.getValue() );
            }
        }
        
        StructuredDocumentUtils.copyChildren(result, result, from);
        return result;
    }
}