/*--
$Id: JakartaRegExpXPathMatcher.java,v 1.4 2004/02/06 09:57:48 jhunter Exp $
Copyright (C) 2001-2004 Jason Hunter & Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the documentation and/or other materials
provided with the distribution.
3. The name "JDOM" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact <request_AT_jdom_DOT_org>.
4. Products derived from this software may not be called "JDOM", nor
may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management <request_AT_jdom_DOT_org>.
In addition, we request (but do not require) that you include in the
end-user documentation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed by the
JDOM Project (http://www.jdom.org/)."
Alternatively, the acknowledgment may be graphical using the logos
available at http://www.jdom.org/images/logos.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
This software consists of voluntary contributions made by many
individuals on behalf of the JDOM Project and was originally
created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
on the JDOM Project, please see <http://www.jdom.org/>.
*/
package org.jdom.contrib.input.scanner;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.xpath.XPath;
import org.xml.sax.Attributes;
import org.apache.regexp.RE;
import org.apache.regexp.RESyntaxException;
/* package */ class JakartaRegExpXPathMatcher extends XPathMatcher {
/**
* The compiled regular expression this matcher matches.
*/
private final RE re;
private final XPath test;
/**
* Creates a new XPath matcher using Jakarta RegExp regular
* expression matcher implementation.
*
* @param expression the XPath-like expression to match.
* @param listener the element listener to notify when an
* element matches the expression.
*
* @throws JDOMException if one of the arguments is invalid.
*/
public JakartaRegExpXPathMatcher(
String expression, ElementListener listener)
throws JDOMException {
super(expression, listener);
try {
String pathPattern = getPathPatternAsRE(expression);
this.re = new RE(pathPattern);
String testPattern = getTestPattern(expression);
if (testPattern != null) {
testPattern = "." + testPattern;
this.test = XPath.newInstance(testPattern);
}
else {
this.test = null;
}
if (isDebug()) {
System.out.println("Listener " + listener + ":");
System.out.println(" " + expression +
" -> RE = " + pathPattern);
System.out.println(" " + expression +
" -> XPath = " + testPattern);
}
}
catch (RESyntaxException ex1) {
throw (new JDOMException(
"Illegal XPath expression: " + expression, ex1));
}
}
/**
* Tries to match an element path and attributes with the XPath
* expression this matcher matches.
* <p>
* This method is invoked when processing the
* <code>startElement</code> SAX event.</p>
* <p>
* This implementation only matches the element path, ignoring
* the attributes.</p>
*
* @param path the path to the element.
* @param attrs the SAX attributes of the element.
*
* @return <code>true</code> is the element matches the XPath
* expression, <code>false</code> otherwise.
*/
public boolean match(String path, Attributes attrs) {
return (this.re.match(path));
}
/**
* Tries to match an element with the XPath expression this
* matcher matches.
* <p>
* This method is invoked when processing the
* <code>endElement</code> SAX event. It allows matching on
* data not part of the <code>startElement</code> event such
* as the presence of child elements.</p>
* <p>
* This implementation always return <code>true</code> as it
* does not support matching on anything but the path.</p>
*
* @param path the path to the element.
* @param elt the JDOM element.
*
* @return <code>true</code> is the element matches the XPath
* expression, <code>false</code> otherwise.
*/
public boolean match(String path, Element elt) {
if (this.test != null) {
boolean match = false;
try {
match = (this.test.selectNodes(elt).size() != 0);
}
catch (Exception ex1) {
ex1.printStackTrace();
}
return (match);
}
else {
return (true);
}
}
}