/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001, 2002 The Apache Software Foundation. All rights
* reserved.
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* 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
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* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache Forrest" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
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*
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* 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 Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
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*/
package org.apache.forrest.yer.libre;
import org.apache.forrest.yer.hierarchy.Entry;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;
import org.apache.xpath.XPathAPI;
import org.apache.avalon.excalibur.xml.Parser;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.transform.TransformerException;
import javax.xml.parsers.DocumentBuilder;
import java.io.InputStream;
import java.io.IOException;
/** Class <code>org.apache.forrest.yer.libre.XPathAttributeReader</code> ...
*
* [FIXME this babe needs serious Avalon enabling in the ]
* @author $Author: jefft $
* @version CVS $Id: XPathAttributeReader.java,v 1.3 2002/11/05 05:52:41 jefft Exp $
*/
public class XPathAttributeReader implements LibreAttributeReader
{
private String xpathQuery;
private LibreConfigHelper helper;
/** Default constructor
*
*/
public XPathAttributeReader(String xpathExpression, LibreConfigHelper helper)
{
this.helper = helper;
this.xpathQuery = xpathExpression;
}
public String getAttributeValue(Entry entryToInspect)
{
return getBareAttributeValue(entryToInspect);
}
public String getBareAttributeValue(Entry entryToInspect) {
String retVal = null;
InputStream inXML = null;
try {// Question: should this exception not be eaten by the server object?
inXML= entryToInspect.getUserXMLStream();
} catch(IOException e) {
e.printStackTrace();
}
if (inXML == null) return null;
Document doc = getDOMDocument(inXML);
try {
Node hit = XPathAPI.selectSingleNode(doc, this.xpathQuery);
if (hit != null) {
retVal = hit.getNodeValue(); //FIXME: read about getNodeValue seems to give strange result on ElementNodes?
}
} catch(TransformerException e) {
e.printStackTrace();
} catch(DOMException e) {
e.printStackTrace();
}
return retVal;
}
public boolean isAttributeValue(Entry entryToInspect)
{
final boolean testValue = (getBareAttributeValue(entryToInspect)!=null);
return this.inverseLogic != testValue;
}
public Document getDOMDocument(InputStream inXML) {
Document doc = null;
Parser excaliburParser = this.helper.getExcaliburParser();
if (excaliburParser != null) {
try {
doc = excaliburParser.parseDocument(new InputSource(inXML));
} catch(SAXException e) {
e.printStackTrace();;
} catch(IOException e) {
e.printStackTrace();
}
} else {
try {
DocumentBuilder db = this.helper.getDocumentBuilder();
doc = db.parse(inXML);
} catch(SAXException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
}
}
return doc;
}
private boolean inverseOrder = false;
public void setOrderDescending(boolean descending)
{
this.inverseOrder = descending;
}
public boolean isOrderDescending()
{
return this.inverseOrder;
}
private boolean inverseLogic = false;
public void setInverseLogic(boolean inverse)
{
this.inverseLogic = inverse;
}
}