Source Code Cross Referenced for XNodeSetForDOM.java in  » XML » xalan » org » apache » xpath » objects » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xalan » org.apache.xpath.objects 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999-2004 The Apache Software Foundation.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        /*
017:         * $Id: XNodeSetForDOM.java,v 1.7 2004/08/17 19:25:39 jycli Exp $
018:         */
019:        package org.apache.xpath.objects;
020:
021:        import org.apache.xml.dtm.DTMManager;
022:        import org.apache.xpath.NodeSetDTM;
023:        import org.apache.xpath.XPathContext;
024:
025:        import org.w3c.dom.Node;
026:        import org.w3c.dom.NodeList;
027:        import org.w3c.dom.traversal.NodeIterator;
028:
029:        /**
030:         * This class overrides the XNodeSet#object() method to provide the original 
031:         * Node object, NodeList object, or NodeIterator.
032:         */
033:        public class XNodeSetForDOM extends XNodeSet {
034:            static final long serialVersionUID = -8396190713754624640L;
035:            Object m_origObj;
036:
037:            public XNodeSetForDOM(Node node, DTMManager dtmMgr) {
038:                m_dtmMgr = dtmMgr;
039:                m_origObj = node;
040:                int dtmHandle = dtmMgr.getDTMHandleFromNode(node);
041:                m_obj = new NodeSetDTM(dtmMgr);
042:                ((NodeSetDTM) m_obj).addNode(dtmHandle);
043:            }
044:
045:            /**
046:             * Construct a XNodeSet object.
047:             *
048:             * @param val Value of the XNodeSet object
049:             */
050:            public XNodeSetForDOM(XNodeSet val) {
051:                super (val);
052:                if (val instanceof  XNodeSetForDOM)
053:                    m_origObj = ((XNodeSetForDOM) val).m_origObj;
054:            }
055:
056:            public XNodeSetForDOM(NodeList nodeList, XPathContext xctxt) {
057:                m_dtmMgr = xctxt.getDTMManager();
058:                m_origObj = nodeList;
059:
060:                // JKESS 20020514: Longer-term solution is to force
061:                // folks to request length through an accessor, so we can defer this
062:                // retrieval... but that requires an API change.
063:                // m_obj=new org.apache.xpath.NodeSetDTM(nodeList, xctxt);
064:                org.apache.xpath.NodeSetDTM nsdtm = new org.apache.xpath.NodeSetDTM(
065:                        nodeList, xctxt);
066:                m_last = nsdtm.getLength();
067:                m_obj = nsdtm;
068:            }
069:
070:            public XNodeSetForDOM(NodeIterator nodeIter, XPathContext xctxt) {
071:                m_dtmMgr = xctxt.getDTMManager();
072:                m_origObj = nodeIter;
073:
074:                // JKESS 20020514: Longer-term solution is to force
075:                // folks to request length through an accessor, so we can defer this
076:                // retrieval... but that requires an API change.
077:                // m_obj = new org.apache.xpath.NodeSetDTM(nodeIter, xctxt);
078:                org.apache.xpath.NodeSetDTM nsdtm = new org.apache.xpath.NodeSetDTM(
079:                        nodeIter, xctxt);
080:                m_last = nsdtm.getLength();
081:                m_obj = nsdtm;
082:            }
083:
084:            /**
085:             * Return the original DOM object that the user passed in.  For use primarily
086:             * by the extension mechanism.
087:             *
088:             * @return The object that this class wraps
089:             */
090:            public Object object() {
091:                return m_origObj;
092:            }
093:
094:            /**
095:             * Cast result object to a nodelist. Always issues an error.
096:             *
097:             * @return null
098:             *
099:             * @throws javax.xml.transform.TransformerException
100:             */
101:            public NodeIterator nodeset()
102:                    throws javax.xml.transform.TransformerException {
103:                return (m_origObj instanceof  NodeIterator) ? (NodeIterator) m_origObj
104:                        : super .nodeset();
105:            }
106:
107:            /**
108:             * Cast result object to a nodelist. Always issues an error.
109:             *
110:             * @return null
111:             *
112:             * @throws javax.xml.transform.TransformerException
113:             */
114:            public NodeList nodelist()
115:                    throws javax.xml.transform.TransformerException {
116:                return (m_origObj instanceof  NodeList) ? (NodeList) m_origObj
117:                        : super.nodelist();
118:            }
119:
120:        }
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