domutil.java

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/*
 * Copyright 1999-2002,2004,2005 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.util;

import java.util.Hashtable;

import com.sun.org.apache.xerces.internal.dom.AttrImpl;
import com.sun.org.apache.xerces.internal.dom.DocumentImpl;
import com.sun.org.apache.xerces.internal.impl.xs.opti.ElementImpl;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * Some useful utility methods.
 * This class was modified in Xerces2 with a view to abstracting as
 * much as possible away from the representation of the underlying
 * parsed structure (i.e., the DOM).  This was done so that, if Xerces
 * ever adopts an in-memory representation more efficient than the DOM
 * (such as a DTM), we should easily be able to convert our schema
 * parsing to utilize it.
 *
 * @version $Id: DOMUtil.java,v 1.2.6.1 2005/09/05 07:48:07 neerajbj Exp $
 */
public class DOMUtil {
    
    //
    // Constructors
    //
    
    /** This class cannot be instantiated. */
    protected DOMUtil() {}
    
    //
    // Public static methods
    //
    
    /**
     * Copies the source tree into the specified place in a destination
     * tree. The source node and its children are appended as children
     * of the destination node.
     * <p>
     * <em>Note:</em> This is an iterative implementation.
     */
    public static void copyInto(Node src, Node dest) throws DOMException {
        
        // get node factory
        Document factory = dest.getOwnerDocument();
        boolean domimpl = factory instanceof DocumentImpl;
        
        // placement variables
        Node start  = src;
        Node parent = src;
        Node place  = src;
        
        // traverse source tree
        while (place != null) {
            
            // copy this node
            Node node = null;
            int  type = place.getNodeType();
            switch (type) {
            case Node.CDATA_SECTION_NODE: {
                node = factory.createCDATASection(place.getNodeValue());
                break;
            }
            case Node.COMMENT_NODE: {
                node = factory.createComment(place.getNodeValue());
                break;
            }
            case Node.ELEMENT_NODE: {
                Element element = factory.createElement(place.getNodeName());
                node = element;
                NamedNodeMap attrs  = place.getAttributes();
                int attrCount = attrs.getLength();
                for (int i = 0; i < attrCount; i++) {
                    Attr attr = (Attr)attrs.item(i);
                    String attrName = attr.getNodeName();
                    String attrValue = attr.getNodeValue();
                    element.setAttribute(attrName, attrValue);
                    if (domimpl && !attr.getSpecified()) {
                        ((AttrImpl)element.getAttributeNode(attrName)).setSpecified(false);
                    }
                }
                break;
            }
            case Node.ENTITY_REFERENCE_NODE: {
                node = factory.createEntityReference(place.getNodeName());
                break;
            }
            case Node.PROCESSING_INSTRUCTION_NODE: {
                node = factory.createProcessingInstruction(place.getNodeName(),
                        place.getNodeValue());
                break;
            }
            case Node.TEXT_NODE: {
                node = factory.createTextNode(place.getNodeValue());
                break;
            }
            default: {
                throw new IllegalArgumentException("can't copy node type, "+
                        type+" ("+
                        node.getNodeName()+')');
            }
            }
            dest.appendChild(node);
            
            // iterate over children
            if (place.hasChildNodes()) {
                parent = place;
                place  = place.getFirstChild();
                dest   = node;
            }
            
            // advance
            else {
                place = place.getNextSibling();
                while (place == null && parent != start) {
                    place  = parent.getNextSibling();
                    parent = parent.getParentNode();
                    dest   = dest.getParentNode();
                }
            }
            
        }
        
    } // copyInto(Node,Node)
    
    /** Finds and returns the first child element node. */
    public static Element getFirstChildElement(Node parent) {
        
        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                return (Element)child;
            }
            child = child.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getFirstChildElement(Node):Element
    
    /** Finds and returns the first visible child element node. */
    public static Element getFirstVisibleChildElement(Node parent) {
        
        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(child)) {
                return (Element)child;
            }
            child = child.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getFirstChildElement(Node):Element
    
    /** Finds and returns the first visible child element node. */
    public static Element getFirstVisibleChildElement(Node parent, Hashtable hiddenNodes) {
        
        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(child, hiddenNodes)) {
                return (Element)child;
            }
            child = child.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getFirstChildElement(Node):Element
    
    /** Finds and returns the last child element node. 
     *  Overload previous method for non-Xerces node impl.
     */
    public static Element getLastChildElement(Node parent) {
        
        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                return (Element)child;
            }
            child = child.getPreviousSibling();
        }
        
        // not found
        return null;
        
    } // getLastChildElement(Node):Element
    
    /** Finds and returns the last visible child element node. */
    public static Element getLastVisibleChildElement(Node parent) {
        
        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(child)) {
                return (Element)child;
            }
            child = child.getPreviousSibling();
        }
        
        // not found
        return null;
        
    } // getLastChildElement(Node):Element
    
    /** Finds and returns the last visible child element node. 
     *  Overload previous method for non-Xerces node impl
     */
    public static Element getLastVisibleChildElement(Node parent, Hashtable hiddenNodes) {
        
        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(child, hiddenNodes)) {
                return (Element)child;
            }
            child = child.getPreviousSibling();
        }
        
        // not found
        return null;
        
    } // getLastChildElement(Node):Element
    /** Finds and returns the next sibling element node. */
    public static Element getNextSiblingElement(Node node) {
        
        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                return (Element)sibling;
            }
            sibling = sibling.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getNextSiblingElement(Node):Element
    
    // get next visible (un-hidden) node.
    public static Element getNextVisibleSiblingElement(Node node) {
        
        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(sibling)) {
                return (Element)sibling;
            }
            sibling = sibling.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getNextSiblingdElement(Node):Element
    
    // get next visible (un-hidden) node, overload previous method for non Xerces node impl
    public static Element getNextVisibleSiblingElement(Node node, Hashtable hiddenNodes) {
        
        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE &&
                    !isHidden(sibling, hiddenNodes)) {
                return (Element)sibling;
            }
            sibling = sibling.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getNextSiblingdElement(Node):Element
    
    // set this Node as being hidden
    public static void setHidden(Node node) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(true, false);
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(true, false);
    } // setHidden(node):void

    // set this Node as being hidden, overloaded method
    public static void setHidden(Node node, Hashtable hiddenNodes) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(true, false);
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(true, false);
        else
        	hiddenNodes.put(node, "");
    } // setHidden(node):void
    
    // set this Node as being visible
    public static void setVisible(Node node) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(false, false);
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(false, false);
    } // setVisible(node):void   

    // set this Node as being visible, overloaded method
    public static void setVisible(Node node, Hashtable hiddenNodes) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(false, false);
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(false, false);
        else
        	hiddenNodes.remove(node);
    } // setVisible(node):void
    
    // is this node hidden?
    public static boolean isHidden(Node node) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            return ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).getReadOnly();
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            return ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).getReadOnly();
        return false;
    } // isHidden(Node):boolean

    // is this node hidden? overloaded method
    public static boolean isHidden(Node node, Hashtable hiddenNodes) {
        if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
            return ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).getReadOnly();
        else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
            return ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).getReadOnly();
        else
        	return hiddenNodes.containsKey(node);
    } // isHidden(Node):boolean
    
    /** Finds and returns the first child node with the given name. */
    public static Element getFirstChildElement(Node parent, String elemName) {
        
        // search for node
        Node child = parent.getFirstChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                if (child.getNodeName().equals(elemName)) {
                    return (Element)child;
                }
            }
            child = child.getNextSibling();
        }
        
        // not found
        return null;
        
    } // getFirstChildElement(Node,String):Element
    
    /** Finds and returns the last child node with the given name. */
    public static Element getLastChildElement(Node parent, String elemName) {
        
        // search for node
        Node child = parent.getLastChild();
        while (child != null) {
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                if (child.getNodeName().equals(elemName)) {
                    return (Element)child;
                }
            }
            child = child.getPreviousSibling();
        }
        
        // not found
        return null;
        
    } // getLastChildElement(Node,String):Element
    
    /** Finds and returns the next sibling node with the given name. */
    public static Element getNextSiblingElement(Node node, String elemName) {
        
        // search for node
        Node sibling = node.getNextSibling();
        while (sibling != null) {
            if (sibling.getNodeType() == Node.ELEMENT_NODE) {
                if (sibling.getNodeName().equals(elemName)) {
                    return (Element)sibling;
                }
            }
            sibling = sibling.getNextSibling();
        }
        
        // not found