/*
* eXist Open Source Native XML Database
* Copyright (C) 2010 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.ant;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Properties;
import javax.xml.transform.OutputKeys;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.PropertyHelper;
import org.exist.util.serializer.SAXSerializer;
import org.exist.util.serializer.SerializerPool;
import org.xmldb.api.DatabaseManager;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.ResourceIterator;
import org.xmldb.api.base.ResourceSet;
import org.xmldb.api.base.XMLDBException;
import org.xmldb.api.modules.XMLResource;
import org.xmldb.api.modules.XPathQueryService;
/**
* an ant task to execute an query using XPath. <p/> The query is either passed
* as nested text in the element, or via an attribute "query". <p/>
*
* @author wolf <p/> modified by:
* @author peter.klotz@blue-elephant-systems.com
*/
public class XMLDBXPathTask extends AbstractXMLDBTask {
private String resource = null;
private String namespace = null;
private String query = null;
private String text = null;
// count mode
private boolean count = false;
private File destDir = null;
private String outputproperty;
// output encoding
private String encoding = "UTF-8";
/*
* (non-Javadoc)
*
* @see org.apache.tools.ant.Task#execute()
*/
public void execute() throws BuildException {
if (uri == null) {
throw new BuildException(
"you have to specify an XMLDB collection URI");
}
if (text != null) {
PropertyHelper helper = PropertyHelper.getPropertyHelper(getProject());
query = helper.replaceProperties(null, text, null);
}
if (query == null) {
throw new BuildException("you have to specify a query");
}
log("XPath is: " + query, org.apache.tools.ant.Project.MSG_DEBUG);
registerDatabase();
try {
log("Get base collection: " + uri, Project.MSG_DEBUG);
Collection base = DatabaseManager.getCollection(uri, user, password);
if (base == null) {
String msg = "Collection " + uri + " could not be found.";
if (failonerror) {
throw new BuildException(msg);
} else {
log(msg, Project.MSG_ERR);
}
} else {
XPathQueryService service = (XPathQueryService) base.getService(
"XPathQueryService", "1.0");
// set pretty-printing on
service.setProperty(OutputKeys.INDENT, "yes");
service.setProperty(OutputKeys.ENCODING, "UTF-8");
if (namespace != null) {
log("Using namespace: " + namespace, Project.MSG_DEBUG);
service.setNamespace("ns", namespace);
}
ResourceSet results = null;
if (resource != null) {
log("Query resource: " + resource, Project.MSG_DEBUG);
results = service.queryResource(resource, query);
} else {
log("Query collection", Project.MSG_DEBUG);
results = service.query(query);
}
log("Found " + results.getSize() + " results", Project.MSG_INFO);
if (destDir != null && results != null) {
log("write results to directory " + destDir.getAbsolutePath(),
Project.MSG_INFO);
ResourceIterator iter = results.getIterator();
XMLResource res = null;
log(
"Writing results to directory "
+ destDir.getAbsolutePath(), Project.MSG_DEBUG);
while (iter.hasMoreResources()) {
res = (XMLResource) iter.nextResource();
log("Writing resource " + res.getId(), Project.MSG_DEBUG);
writeResource(res, destDir);
}
} else if (outputproperty != null) {
if (count) {
getProject().setNewProperty(outputproperty,
String.valueOf(results.getSize()));
} else {
ResourceIterator iter = results.getIterator();
XMLResource res = null;
StringBuffer result = new StringBuffer();
while (iter.hasMoreResources()) {
res = (XMLResource) iter.nextResource();
result.append(res.getContent().toString());
result.append("\n");
}
getProject().setNewProperty(outputproperty, result.toString());
}
}
}
} catch (XMLDBException e) {
String msg = "XMLDB exception caught while executing query: " + e.getMessage();
if (failonerror) {
throw new BuildException(msg, e);
} else {
log(msg, e, Project.MSG_ERR);
}
} catch (IOException e) {
String msg = "XMLDB exception caught while writing destination file: " + e.getMessage();
if (failonerror) {
throw new BuildException(msg, e);
} else {
log(msg, e, Project.MSG_ERR);
}
}
}
private void writeResource(XMLResource resource, File dest)
throws IOException, XMLDBException {
if (dest != null) {
Properties outputProperties = new Properties();
outputProperties.setProperty(OutputKeys.INDENT, "yes");
SAXSerializer serializer = (SAXSerializer) SerializerPool.getInstance().borrowObject(SAXSerializer.class);
Writer writer = null;
if (dest.isDirectory()) {
if (!dest.exists()) {
dest.mkdirs();
}
String fname = resource.getId();
if (!fname.endsWith(".xml")) {
fname += ".xml";
}
File file = new File(dest, fname);
writer = new OutputStreamWriter(new FileOutputStream(file), encoding);
} else {
writer = new OutputStreamWriter(new FileOutputStream(dest), encoding);
}
serializer.setOutput(writer, outputProperties);
resource.getContentAsSAX(serializer);
writer.close();
SerializerPool.getInstance().returnObject(serializer);
} else {
String msg = "Destination target does not exist.";
if (failonerror) {
throw new BuildException(msg);
} else {
log(msg, Project.MSG_ERR);
}
}
}
/**
* @param query
*/
public void setQuery(String query) {
this.query = query;
}
public void addText(String text) {
this.text = text;
}
public void setResource(String resource) {
this.resource = resource;
}
public void setNamespace(String namespace) {
this.namespace = namespace;
}
public void setDestDir(File destDir) {
this.destDir = destDir;
}
public void setOutputproperty(String outputproperty) {
this.outputproperty = outputproperty;
}
public void setCount(boolean count) {
this.count = count;
}
}