001: /*
002: * $Id: XMLContextImpl.java,v 1.2 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: import org.openlaszlo.iv.flash.context.*;
055: import org.openlaszlo.iv.flash.util.*;
056:
057: import java.util.*;
058:
059: import javax.xml.transform.TransformerException;
060:
061: import org.w3c.dom.*;
062: import org.w3c.dom.traversal.NodeIterator;
063:
064: import com.caucho.xpath.*;
065:
066: /**
067: * Resin XML context
068: * <P>
069: * Represents one xml node
070: *
071: * @author Dmitry Skavish
072: */
073:
074: public class XMLContextImpl extends XMLContext {
075:
076: /**
077: * Creates xml context with specified parent and xml node.
078: *
079: * @param parent parent context
080: * @param node xml node represented by this context
081: */
082:
083: public XMLContextImpl(Context parent, Node node) {
084: super (parent, node);
085: }
086:
087: /**
088: * Evaluates the specified path ( as XPath ) in this context or nearest
089: * xml parent.
090: *
091: * @param string containing XPath expression
092: * @return string representation of result of xpath execution or empty string
093: */
094: public String getValue(String path) {
095: // Evaluate the XPath in this context
096:
097: //System.out.println( "XMLContext.getValue("+path+")" );
098: try {
099: String value = XPath.evalString(path, node);
100:
101: if (value != null && value.length() > 0 /*&& !isUndefined( xo )*/) {
102: return value;
103: }
104: } catch (com.caucho.xpath.XPathException e) {
105: // ignore this exception, it usually means that it is not an
106: // xpath, but just a variable
107: } catch (Exception e) {
108: Log.logRB(e);
109: }
110:
111: return getValueFromParent(path);
112: }
113:
114: /**
115: * Evaluates the specified path ( as XPath ) in this context or nearest
116: * xml parent. If the path evaluates to a nodeset, a list of contexts for
117: * the nodes in that nodeset is returned, otherwise null
118: *
119: * @param string containing XPath expression
120: * @returns list of contexts or null
121: */
122: public List getValueList(String path) {
123:
124: try {
125: Iterator it = XPath.select(path, node);
126: if (it != null) {
127: ArrayList list = new ArrayList();
128: while (it.hasNext()) {
129: Node n = (Node) it.next();
130: list.add(new XMLContextImpl(this , n));
131: }
132:
133: return list;
134: }
135: } catch (com.caucho.xpath.XPathException e) {
136: }
137:
138: // The path either evaluated to nothing ( an unresolvable path ) or an
139: // atomic type. Neither of these suit our purposes ( I think ) so for
140: // now defer to the parent.
141:
142: return getValueListFromParent(path);
143: }
144:
145: }
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