saximpl.java

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/*
 * Copyright 2001-2004 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.
 */
/*
 * $Id: SAXImpl.java,v 1.19 2004/02/24 04:21:50 zongaro Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.dom;

import java.net.URL;
import java.net.MalformedURLException;
import java.util.Enumeration;

import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.DOMEnhancedForDTM;
import com.sun.org.apache.xalan.internal.xsltc.StripFilter;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
import com.sun.org.apache.xalan.internal.xsltc.runtime.Hashtable;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.DTMManager;
import com.sun.org.apache.xml.internal.dtm.DTMWSFilter;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIterNodeList;
import com.sun.org.apache.xml.internal.dtm.ref.DTMDefaultBase;
import com.sun.org.apache.xml.internal.dtm.ref.EmptyIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMNodeProxy;
import com.sun.org.apache.xml.internal.dtm.ref.sax2dtm.SAX2DTM2;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
import com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler;
import com.sun.org.apache.xml.internal.utils.XMLStringFactory;
import com.sun.org.apache.xml.internal.utils.SystemIDResolver;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Entity;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;


/**
 * SAXImpl is the core model for SAX input source. SAXImpl objects are
 * usually created from an XSLTCDTMManager.
 *
 * <p>DOMSource inputs are handled using DOM2SAX + SAXImpl. SAXImpl has a
 * few specific fields (e.g. _node2Ids, _document) to keep DOM-related
 * information. They are used when the processing behavior between DOM and
 * SAX has to be different. Examples of these include id function and 
 * unparsed entity.
 *
 * <p>SAXImpl extends SAX2DTM2 instead of SAX2DTM for better performance.
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 * @author Douglas Sellers <[e-mail]>
 */
public final class SAXImpl extends SAX2DTM2
                           implements DOMEnhancedForDTM, DOMBuilder
{
    
    /* ------------------------------------------------------------------- */
    /* DOMBuilder fields BEGIN                                             */
    /* ------------------------------------------------------------------- */

    // Namespace prefix-to-uri mapping stuff
    private int       _uriCount     = 0;
    private int       _prefixCount  = 0;

    // Stack used to keep track of what whitespace text nodes are protected
    // by xml:space="preserve" attributes and which nodes that are not.
    private int[]   _xmlSpaceStack;
    private int     _idx = 1;
    private boolean _preserve = false;

    private static final String XML_STRING = "xml:";
    private static final String XML_PREFIX   = "xml";   
    private static final String XMLSPACE_STRING = "xml:space";
    private static final String PRESERVE_STRING = "preserve";
    private static final String XMLNS_PREFIX = "xmlns";
    private static final String XML_URI = "http://www.w3.org/XML/1998/namespace";

    private boolean _escaping = true;
    private boolean _disableEscaping = false;
    private int _textNodeToProcess = DTM.NULL;

    /* ------------------------------------------------------------------- */
    /* DOMBuilder fields END                                               */
    /* ------------------------------------------------------------------- */

    // empty String for null attribute values
    private final static String EMPTYSTRING = "";

    // empty iterator to be returned when there are no children
    private final static DTMAxisIterator EMPTYITERATOR = EmptyIterator.getInstance();
    // The number of expanded names
    private int _namesSize = -1;

    // Namespace related stuff
    private Hashtable _nsIndex = new Hashtable();
   
    // The initial size of the text buffer
    private int _size = 0;
    
    // Tracks which textnodes are not escaped
    private BitArray  _dontEscape = null;

    // The URI to this document
    private String    _documentURI = null;
    static private int _documentURIIndex = 0;

    // The owner Document when the input source is DOMSource.
    private Document _document;

    // The hashtable for org.w3c.dom.Node to node id mapping.
    // This is only used when the input is a DOMSource and the
    // buildIdIndex flag is true.
    private Hashtable _node2Ids = null;

    // True if the input source is a DOMSource.
    private boolean _hasDOMSource = false;

    // The DTMManager
    private XSLTCDTMManager _dtmManager;

    // Support for access/navigation through org.w3c.dom API
    private Node[] _nodes;
    private NodeList[] _nodeLists;
    private final static String XML_LANG_ATTRIBUTE =
        "http://www.w3.org/XML/1998/namespace:@lang";

    /**
     * Define the origin of the document from which the tree was built
     */
    public void setDocumentURI(String uri) {
        if (uri != null) {
            setDocumentBaseURI(SystemIDResolver.getAbsoluteURI(uri));
        }
    }

    /**
     * Returns the origin of the document from which the tree was built
     */
    public String getDocumentURI() {
        String baseURI = getDocumentBaseURI();
        return (baseURI != null) ? baseURI : "rtf" + _documentURIIndex++;
    }

    public String getDocumentURI(int node) {
        return getDocumentURI();
    }

    public void setupMapping(String[] names, String[] urisArray,
                             int[] typesArray, String[] namespaces) {
        // This method only has a function in DOM adapters
    }

    /**
     * Lookup a namespace URI from a prefix starting at node. This method
     * is used in the execution of xsl:element when the prefix is not known
     * at compile time.
     */
    public String lookupNamespace(int node, String prefix)
        throws TransletException
    {
        int anode, nsnode;
        final AncestorIterator ancestors = new AncestorIterator();

        if (isElement(node)) {
            ancestors.includeSelf();
        }

        ancestors.setStartNode(node);
        while ((anode = ancestors.next()) != DTM.NULL) {
            final NamespaceIterator namespaces = new NamespaceIterator();

            namespaces.setStartNode(anode);
            while ((nsnode = namespaces.next()) != DTM.NULL) {
                if (getLocalName(nsnode).equals(prefix)) {
                    return getNodeValue(nsnode);
                }
            }
        }

        BasisLibrary.runTimeError(BasisLibrary.NAMESPACE_PREFIX_ERR, prefix);
        return null;
    }

    /**
     * Returns 'true' if a specific node is an element (of any type)
     */
    public boolean isElement(final int node) {
        return getNodeType(node) == DTM.ELEMENT_NODE;
    }

    /**
     * Returns 'true' if a specific node is an attribute (of any type)
     */
    public boolean isAttribute(final int node) {
        return getNodeType(node) == DTM.ATTRIBUTE_NODE;
    }

    /**
     * Returns the number of nodes in the tree (used for indexing)
     */
    public int getSize() {
        return getNumberOfNodes();
    }

    /**
     * Part of the DOM interface - no function here.
     */
    public void setFilter(StripFilter filter) {
    }


    /**
     * Returns true if node1 comes before node2 in document order
     */
    public boolean lessThan(int node1, int node2) {
        if (node1 == DTM.NULL) {
            return false;
        }

        if (node2 == DTM.NULL) {
            return true;
        }

        return (node1 < node2);
    }

    /**
     * Create an org.w3c.dom.Node from a node in the tree
     */
    public Node makeNode(int index) {
        if (_nodes == null) {
            _nodes = new Node[_namesSize];
        }

        int nodeID = makeNodeIdentity(index);
        if (nodeID < 0) {
            return null;
        }
        else if (nodeID < _nodes.length) {
            return (_nodes[nodeID] != null) ? _nodes[nodeID] 
                : (_nodes[nodeID] = new DTMNodeProxy((DTM)this, index));
        }
        else {
            return new DTMNodeProxy((DTM)this, index);
        }
    }

    /**
     * Create an org.w3c.dom.Node from a node in an iterator
     * The iterator most be started before this method is called
     */
    public Node makeNode(DTMAxisIterator iter) {
        return makeNode(iter.next());
    }

    /**
     * Create an org.w3c.dom.NodeList from a node in the tree
     */
    public NodeList makeNodeList(int index) {
        if (_nodeLists == null) {
            _nodeLists = new NodeList[_namesSize];
        }
        
        int nodeID = makeNodeIdentity(index);
        if (nodeID < 0) {
            return null;
        }
        else if (nodeID < _nodeLists.length) {
            return (_nodeLists[nodeID] != null) ? _nodeLists[nodeID]
                   : (_nodeLists[nodeID] = new DTMAxisIterNodeList(this,
                                                 new SingletonIterator(index)));
    }
        else {
            return new DTMAxisIterNodeList(this, new SingletonIterator(index));
        }
    }

    /**
     * Create an org.w3c.dom.NodeList from a node iterator
     * The iterator most be started before this method is called
     */
    public NodeList makeNodeList(DTMAxisIterator iter) {
        return new DTMAxisIterNodeList(this, iter);
    }

    /**
     * Iterator that returns the namespace nodes as defined by the XPath data
     * model for a given node, filtered by extended type ID.
     */
    public class TypedNamespaceIterator extends NamespaceIterator {
        
        private  String _nsPrefix;

        /**
         * Constructor TypedChildrenIterator
         *
         *
         * @param nodeType The extended type ID being requested.
         */
        public TypedNamespaceIterator(int nodeType) { 
            super();
            if(m_expandedNameTable != null){
                _nsPrefix = m_expandedNameTable.getLocalName(nodeType);
            }
        }

       /**
        * Get the next node in the iteration.
        *
        * @return The next node handle in the iteration, or END.
        */
        public int next() {
            if ((_nsPrefix == null) ||(_nsPrefix.length() == 0) ){
                return (END);
            }          
            int node = END;
            for (node = super.next(); node != END; node = super.next()) {
                if (_nsPrefix.compareTo(getLocalName(node))== 0) {
                    return returnNode(node);
                }
            }
            return (END);
        }
    }  // end of TypedNamespaceIterator



    /**************************************************************
     * This is a specialised iterator for predicates comparing node or
     * attribute values to variable or parameter values.
     */
    private final class NodeValueIterator extends InternalAxisIteratorBase
    {

	private DTMAxisIterator _source;
	private String _value;
	private boolean _op;
	private final boolean _isReverse;
	private int _returnType = RETURN_PARENT;

	public NodeValueIterator(DTMAxisIterator source, int returnType,
				 String value, boolean op)
        {
	    _source = source;
	    _returnType = returnType;
	    _value = value;
	    _op = op;
	    _isReverse = source.isReverse();
	}

	public boolean isReverse()
        {
	    return _isReverse;
	}

        public DTMAxisIterator cloneIterator()
        {
            try {
                NodeValueIterator clone = (NodeValueIterator)super.clone();
                clone._isRestartable = false;
                clone._source = _source.cloneIterator();
                clone._value = _value;
                clone._op = _op;
                return clone.reset();
            }
            catch (CloneNotSupportedException e) {
                BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
                                          e.toString());
                return null;
            }
        }
  
        public void setRestartable(boolean isRestartable)
        {
	    _isRestartable = isRestartable;
	    _source.setRestartable(isRestartable);
	}

	public DTMAxisIterator reset()
        {
	    _source.reset();
	    return resetPosition();
	}

	public int next()
        {
            int node;
            while ((node = _source.next()) != END) {
                String val = getStringValueX(node);
                if (_value.equals(val) == _op) {
                    if (_returnType == RETURN_CURRENT) {
                        return returnNode(node);
                    }
                    else {
                        return returnNode(getParent(node));
                    }
                }
            }
            return END;
        }

	public DTMAxisIterator setStartNode(int node)
        {
            if (_isRestartable) {
                _source.setStartNode(_startNode = node);
                return resetPosition();
            }
            return this;
        }

	public void setMark()
        {
	    _source.setMark();
	}

	public void gotoMark()
        {
	    _source.gotoMark();
	}
    } // end NodeValueIterator

    public DTMAxisIterator getNodeValueIterator(DTMAxisIterator iterator, int type,
					     String value, boolean op)
    {
        return(DTMAxisIterator)(new NodeValueIterator(iterator, type, value, op));
    }

    /**
     * Encapsulates an iterator in an OrderedIterator to ensure node order
     */
    public DTMAxisIterator orderNodes(DTMAxisIterator source, int node)
    {
        return new DupFilterIterator(source);
    }

    /**
     * Returns singleton iterator containg the document root
     * Works for them main document (mark == 0)
     */
    public DTMAxisIterator getIterator()
    {
        return new SingletonIterator(getDocument());
    }

     /**
     * Get mapping from DOM namespace types to external namespace types
     */
    public int getNSType(int node)
    {
    	String s = getNamespaceURI(node);
    	if (s == null) {
    	    return 0;