src/org/apache/xerces/dom/DeferredAttrNSImpl.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999, 2000 The Apache Software Foundation.  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.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * 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 the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * WARNING: because java doesn't support multi-inheritance some code is
 * duplicated. If you're changing this file you probably want to change
 * DeferredAttrImpl.java at the same time.
 */

/* $Id$ */


package org.apache.xerces.dom;

/**
 * DeferredAttrNSImpl is to AttrNSImpl, what DeferredAttrImpl is to
 * AttrImpl. 
 * @author Andy Clark, IBM
 * @author Arnaud  Le Hors, IBM
 * @see DeferredAttrImpl
 */
public final class DeferredAttrNSImpl
    extends AttrNSImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = 6074924934945957154L;

    //
    // Data
    //

    /** Node index. */
    protected transient int fNodeIndex;

    //
    // Constructors
    //

    /**
     * This is the deferred constructor. Only the fNodeIndex is given here.
     * All other data, can be requested from the ownerDocument via the index.
     */
    DeferredAttrNSImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
        super(ownerDocument, null);

        fNodeIndex = nodeIndex;
        needsSyncData(true);
        needsSyncChildren(true);

    } // <init>(DeferredDocumentImpl,int)

    //
    // DeferredNode methods
    //

    /** Returns the node index. */
    public int getNodeIndex() {
        return fNodeIndex;
    }

    //
    // Protected methods
    //

    /** Synchronizes the data (name and value) for fast nodes. */
    protected void synchronizeData() {

        // no need to sync in the future
        needsSyncData(false);

        // fluff data
        DeferredDocumentImpl ownerDocument =
	    (DeferredDocumentImpl) ownerDocument();
        name = ownerDocument.getNodeName(fNodeIndex);

        // extract prefix and local part from QName
        int index = name.indexOf(':');
        String prefix;
        if (index < 0) {
            prefix = null;
            localName = name;
        } 
        else {
            prefix = name.substring(0, index); 
            localName = name.substring(index + 1);
        }

        isSpecified(ownerDocument.getNodeExtra(fNodeIndex) == 1);
        namespaceURI = ownerDocument.getNodeURI(fNodeIndex);
        // hide the fact that our parser uses an empty string for null
        if (namespaceURI != null && namespaceURI.length() == 0) {
            namespaceURI = null;
        }
	// DOM Level 2 wants all namespace declaration attributes
	// to be bound to "http://www.w3.org/2000/xmlns/"
	// So as long as the XML parser doesn't do it, it needs to
	// done here.
	if (namespaceURI == null) {
	    if (prefix != null)  {
		if (prefix.equals("xmlns")) {
		    namespaceURI = "http://www.w3.org/2000/xmlns/";
		}
	    } else if (name.equals("xmlns")) {
		namespaceURI = "http://www.w3.org/2000/xmlns/";
	    }
	}

    } // synchronizeData()

    /**
     * Synchronizes the node's children with the internal structure.
     * Fluffing the children at once solves a lot of work to keep
     * the two structures in sync. The problem gets worse when
     * editing the tree -- this makes it a lot easier.
     */
    protected void synchronizeChildren() {
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl) ownerDocument();
        ownerDocument.synchronizeChildren(this, fNodeIndex);
    } // synchronizeChildren()

} // class DeferredAttrImpl