/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, 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 following disclaimer in 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 Cocoon" and "Apache Software Foundation" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
apache@apache.org.
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
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
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, 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 Apache Software Foundation and was originally created by
Stefano Mazzocchi <stefano@apache.org>. For more information on the Apache
Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.cocoon.components.source.impl;
import java.io.IOException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.parameters.Parameterizable;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.components.source.SourceInspector;
import org.apache.cocoon.components.source.helpers.SourceProperty;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceException;
import org.apache.excalibur.source.SourceValidity;
import org.apache.excalibur.source.impl.validity.NOPValidity;
import org.apache.excalibur.xml.dom.DOMParser;
import org.apache.excalibur.xml.xpath.XPathProcessor;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* This source inspector inspects XML files with a xpath expression.
*
* @author <a href="mailto:stephan@apache.org">Stephan Michels</a>
* @author <a href="mailto:unico@apache.org">Unico Hommes</a>
* @version CVS $Id: XPathSourceInspector.java,v 1.6 2003/11/21 16:09:28 unico Exp $
*/
public class XPathSourceInspector extends AbstractLogEnabled implements
SourceInspector, Serviceable, Parameterizable, ThreadSafe {
/**
* The default namespace uri of the property exposed by this SourceInspector.
* <p>
* The value is <code>http://apache.org/cocoon/inspector/xpath/1.0</code>.
* </p>
*/
public static final String DEFAULT_PROPERTY_NS = "http://apache.org/cocoon/inspector/xpath/1.0";
/**
* The default property name exposed by this SourceInspector.
* <p>
* The value is <code>result</code> .
* </p>
*/
public static final String DEFAULT_PROPERTY_NAME = "result";
private static final SourceValidity VALIDITY = new NOPValidity();
private String propertynamespace;
private String propertyname;
private String extension;
private String xpath;
private ServiceManager manager = null;
public void service(ServiceManager manager) {
this.manager = manager;
}
public void parameterize(Parameters params) {
this.propertynamespace = params.getParameter("namespace", DEFAULT_PROPERTY_NS);
this.propertyname = params.getParameter("name", DEFAULT_PROPERTY_NAME);
this.extension = params.getParameter("extension", ".xml");
this.xpath = params.getParameter("xpath", "/*");
}
public SourceProperty getSourceProperty(Source source, String namespace, String name)
throws SourceException {
if ((namespace.equals(propertynamespace)) && (name.equals(propertyname)) &&
(source.getURI().endsWith(extension))) {
DOMParser parser = null;
Document doc = null;
try {
parser = (DOMParser)manager.lookup(DOMParser.ROLE);
doc = parser.parseDocument(new InputSource(source.getInputStream()));
} catch (SAXException se) {
this.getLogger().error(source.getURI()
+ " is not a valid XML file");
} catch (IOException ioe) {
this.getLogger().error("Could not read file", ioe);
} catch (ServiceException ce) {
this.getLogger().error("Could not retrieve component", ce);
} finally {
if (parser != null) {
this.manager.release(parser);
}
}
if (doc != null) {
XPathProcessor processor = null;
try {
processor = (XPathProcessor)manager.lookup(XPathProcessor.ROLE);
NodeList nodelist = processor.selectNodeList(doc.getDocumentElement(), this.xpath);
SourceProperty property = new SourceProperty(this.propertynamespace, this.propertyname);
property.setValue(nodelist);
return property;
} catch (ServiceException se) {
this.getLogger().error("Could not retrieve component", se);
} finally {
if (processor != null) {
this.manager.release(processor);
}
}
}
}
return null;
}
public SourceProperty[] getSourceProperties(Source source) throws SourceException {
SourceProperty property = getSourceProperty(source, this.propertynamespace, this.propertyname);
if (property!=null)
return new SourceProperty[]{property};
return null;
}
public boolean handlesProperty(String namespace, String name) {
return this.propertynamespace.equals(namespace) && this.propertyname.equals(name);
}
/**
* Returns NOPValidity
*/
public SourceValidity getValidity(Source source) {
return VALIDITY;
}
}