001: /*
002: * $Id: XPathProcessorImpl.java,v 1.3 2002/02/24 02:10:19 skavish Exp $
003: *
004: * ===========================================================================
005: *
006: * The JGenerator Software License, Version 1.0
007: *
008: * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009: *
010: * Redistribution and use in source and binary forms, with or without
011: * modification, are permitted provided that the following conditions are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowlegement:
023: * "This product includes software developed by Dmitry Skavish
024: * (skavish@usa.net, http://www.flashgap.com/)."
025: * Alternately, this acknowlegement may appear in the software itself,
026: * if and wherever such third-party acknowlegements normally appear.
027: *
028: * 4. The name "The JGenerator" must not be used to endorse or promote
029: * products derived from this software without prior written permission.
030: * For written permission, please contact skavish@usa.net.
031: *
032: * 5. Products derived from this software may not be called "The JGenerator"
033: * nor may "The JGenerator" appear in their names without prior written
034: * permission of Dmitry Skavish.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: *
049: */
050:
051: package org.openlaszlo.iv.flash.xml.caucho;
052:
053: import org.openlaszlo.iv.flash.xml.*;
054:
055: import java.util.Iterator;
056: import org.w3c.dom.*;
057: import javax.xml.transform.TransformerException;
058:
059: import com.caucho.xpath.*;
060:
061: /**
062: * XPath processor
063: * <P>
064: * Provides various methods for XPath processing
065: *
066: * @author Dmitry Skavish
067: */
068: public class XPathProcessorImpl implements XPathProcessor {
069:
070: /**
071: * Evaluates XPath to list of nodes.
072: *
073: * @param expr XPath expression
074: * @param node xml node to evaluated on
075: * @return result of xpath execution - iterator on nodes
076: * @exception Exception
077: */
078: public Iterator selectNodeList(String expr, Node node)
079: throws TransformerException {
080: try {
081: //org.openlaszlo.iv.flash.util.Log.info("selectNodeList("+expr+", node="+node.getNodeName()+")");
082: return XPath.select(expr, node);
083: } catch (XPathException e) {
084: throw new TransformerException(e);
085: }
086: }
087:
088: /**
089: * Evaluates XPath to one node.
090: *
091: * @param expr XPath expression
092: * @param node xml node to be evaluated on
093: * @return xml node
094: * @exception Exception
095: */
096: public Node selectSingleNode(String expr, Node node)
097: throws TransformerException {
098: try {
099: //org.openlaszlo.iv.flash.util.Log.info("selectSingleNode("+expr+", node="+node.getNodeName()+")");
100: Iterator it = XPath.select(expr, node);
101: if (it.hasNext())
102: return (Node) it.next();
103: return null;
104: } catch (XPathException e) {
105: throw new TransformerException(e);
106: }
107: }
108: }
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