rangeimpl.java

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/*
 * Copyright 1999-2005 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.dom;

import java.util.Vector;

import org.w3c.dom.CharacterData;
import org.w3c.dom.DOMException;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Node;
import org.w3c.dom.ranges.Range;
import org.w3c.dom.ranges.RangeException;


/** The RangeImpl class implements the org.w3c.dom.range.Range interface.
 *  <p> Please see the API documentation for the interface classes  
 *  and use the interfaces in your client programs.
 *  
 * @xerces.internal
 *
 * @version $Id: RangeImpl.java,v 1.2.6.1 2005/08/31 12:44:48 sunithareddy Exp $
 */
public class RangeImpl  implements Range {
    
    //
    // Constants
    //
    

    //
    // Data
    //
    
    DocumentImpl fDocument;
    Node fStartContainer;
    Node fEndContainer;
    int fStartOffset;
    int fEndOffset;
    boolean fIsCollapsed;   
    boolean fDetach = false;
    Node fInsertNode = null;
    Node fDeleteNode = null;
    Node fSplitNode = null;
    // Was the Node inserted from the Range or the Document
    boolean fInsertedFromRange = false; 
    
    /** The constructor. Clients must use DocumentRange.createRange(),
     *  because it registers the Range with the document, so it can 
     *  be fixed-up.
     */
    public RangeImpl(DocumentImpl document) {
        fDocument = document;
        fStartContainer = document;
        fEndContainer = document;
        fStartOffset = 0;
        fEndOffset = 0;
        fDetach = false;
    }
    
    public Node getStartContainer() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }
        return fStartContainer;
    }
    
    public int getStartOffset() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }
        return fStartOffset;
    }
    
    public Node getEndContainer() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }
        return fEndContainer;
    }
    
    public int getEndOffset() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }    
        return fEndOffset;
    }
    
    public boolean getCollapsed() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }
        return (fStartContainer == fEndContainer 
             && fStartOffset == fEndOffset);
    }
    
    public Node getCommonAncestorContainer() {
        if ( fDetach ) {
            throw new DOMException(
                DOMException.INVALID_STATE_ERR, 
                DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
        }
        Vector startV = new Vector();
        Node node;
        for (node=fStartContainer; node != null; 
             node=node.getParentNode()) 
        {
            startV.addElement(node);
        }
        Vector endV = new Vector();
        for (node=fEndContainer; node != null; 
             node=node.getParentNode()) 
        {
            endV.addElement(node);
        }
        int s = startV.size()-1;
        int e = endV.size()-1;
        Object result = null;
        while (s>=0 && e>=0) {
            if (startV.elementAt(s) == endV.elementAt(e)) {
                result = startV.elementAt(s);
            } else {
                break;
            }
            --s;
            --e;
        }
        return (Node)result; 
    }
    
    
    public void setStart(Node refNode, int offset)
                         throws RangeException, DOMException
    {
        if (fDocument.errorChecking) {
            if ( fDetach) {
                throw new DOMException(
                        DOMException.INVALID_STATE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
            }
            if ( !isLegalContainer(refNode)) {
                throw new RangeExceptionImpl(
                        RangeException.INVALID_NODE_TYPE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_NODE_TYPE_ERR", null));
            }
            if ( fDocument != refNode.getOwnerDocument() && fDocument != refNode) {
                throw new DOMException(
                        DOMException.WRONG_DOCUMENT_ERR,
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null));
            }
        }
        
        checkIndex(refNode, offset);
        
        fStartContainer = refNode;
        fStartOffset = offset;
        
        // If one boundary-point of a Range is set to have a root container
        // other
        // than the current one for the Range, the Range should be collapsed to
        // the new position.
        // The start position of a Range should never be after the end position.
        if (getCommonAncestorContainer() == null
                || (fStartContainer == fEndContainer && fEndOffset < fStartOffset)) {
            collapse(true);
        } 
    }
    
    public void setEnd(Node refNode, int offset)
                       throws RangeException, DOMException
    {
        if (fDocument.errorChecking) {
            if (fDetach) {
                throw new DOMException(
                        DOMException.INVALID_STATE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
            }
            if ( !isLegalContainer(refNode)) {
                throw new RangeExceptionImpl(
                        RangeException.INVALID_NODE_TYPE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_NODE_TYPE_ERR", null));
            }
            if ( fDocument != refNode.getOwnerDocument() && fDocument != refNode) {
                throw new DOMException(
                        DOMException.WRONG_DOCUMENT_ERR,
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null));
            }
        }
    	
        checkIndex(refNode, offset);
        
        fEndContainer = refNode;
        fEndOffset = offset;
        
        // If one boundary-point of a Range is set to have a root container
        // other
        // than the current one for the Range, the Range should be collapsed to
        // the new position.
        // The start position of a Range should never be after the end position.
        if (getCommonAncestorContainer() == null
                || (fStartContainer == fEndContainer && fEndOffset < fStartOffset)) {
            collapse(false);
        } 
    }

    public void setStartBefore(Node refNode) 
        throws RangeException 
    {
        if (fDocument.errorChecking) {
            if (fDetach) {
                throw new DOMException(
                        DOMException.INVALID_STATE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
            }
            if ( !hasLegalRootContainer(refNode) ||
                    !isLegalContainedNode(refNode) )
            {
                throw new RangeExceptionImpl(
                        RangeException.INVALID_NODE_TYPE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_NODE_TYPE_ERR", null));
            }
            if ( fDocument != refNode.getOwnerDocument() && fDocument != refNode) {
                throw new DOMException(
                        DOMException.WRONG_DOCUMENT_ERR,
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null));
            }
        }
    	
        fStartContainer = refNode.getParentNode();
        int i = 0;
        for (Node n = refNode; n!=null; n = n.getPreviousSibling()) {
            i++;
        }
        fStartOffset = i-1;
        
        // If one boundary-point of a Range is set to have a root container
        // other
        // than the current one for the Range, the Range should be collapsed to
        // the new position.
        // The start position of a Range should never be after the end position.
        if (getCommonAncestorContainer() == null
                || (fStartContainer == fEndContainer && fEndOffset < fStartOffset)) {
            collapse(true);
        }  
    }
    
    public void setStartAfter(Node refNode)
        throws RangeException
    {
        if (fDocument.errorChecking) {
            if (fDetach) {
                throw new DOMException(
                        DOMException.INVALID_STATE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
            }
            if ( !hasLegalRootContainer(refNode) || 
                    !isLegalContainedNode(refNode)) {
                throw new RangeExceptionImpl(
                        RangeException.INVALID_NODE_TYPE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_NODE_TYPE_ERR", null));
            }
            if ( fDocument != refNode.getOwnerDocument() && fDocument != refNode) {
                throw new DOMException(
                        DOMException.WRONG_DOCUMENT_ERR,
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null));
            }
        }
        fStartContainer = refNode.getParentNode();
        int i = 0;
        for (Node n = refNode; n!=null; n = n.getPreviousSibling()) {
            i++;
        }
        fStartOffset = i;
        
        // If one boundary-point of a Range is set to have a root container
        // other
        // than the current one for the Range, the Range should be collapsed to
        // the new position.
        // The start position of a Range should never be after the end position.
        if (getCommonAncestorContainer() == null
                || (fStartContainer == fEndContainer && fEndOffset < fStartOffset)) {
            collapse(true);
        } 
    }
    
    public void setEndBefore(Node refNode)
        throws RangeException
    {
        if (fDocument.errorChecking) {
            if (fDetach) {
                throw new DOMException(
                        DOMException.INVALID_STATE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_STATE_ERR", null));
            }
            if ( !hasLegalRootContainer(refNode) ||
                    !isLegalContainedNode(refNode)) {
                throw new RangeExceptionImpl(
                        RangeException.INVALID_NODE_TYPE_ERR, 
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_NODE_TYPE_ERR", null));
            }
            if ( fDocument != refNode.getOwnerDocument() && fDocument != refNode) {
                throw new DOMException(
                        DOMException.WRONG_DOCUMENT_ERR,
                        DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null));
            }
        }
        fEndContainer = refNode.getParentNode();
        int i = 0;
        for (Node n = refNode; n!=null; n = n.getPreviousSibling()) {
            i++;
        }
        fEndOffset = i-1;

        // If one boundary-point of a Range is set to have a root container
        // other
        // than the current one for the Range, the Range should be collapsed to
        // the new position.
        // The start position of a Range should never be after the end position.
        if (getCommonAncestorContainer() == null
                || (fStartContainer == fEndContainer && fEndOffset < fStartOffset)) {
            collapse(false);
        } 
    }