/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2009 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 program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*/
package org.exist.xquery.functions.xmldb;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.StringValue;
import org.exist.xquery.value.Type;
import org.exist.xquery.value.ValueSequence;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.XMLDBException;
public class XMLDBGetChildResources extends XMLDBAbstractCollectionManipulator {
protected static final Logger logger = Logger.getLogger(XMLDBGetChildResources.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("get-child-resources", XMLDBModule.NAMESPACE_URI, XMLDBModule.PREFIX),
"Returns the names of the child resources in collection $collection-uri. " +
XMLDBModule.COLLECTION_URI,
new SequenceType[] {
new FunctionParameterSequenceType("collection-uri", Type.ITEM, Cardinality.EXACTLY_ONE, "The collection URI")
},
new FunctionReturnSequenceType(Type.STRING, Cardinality.ZERO_OR_MORE, "the sequence of resource names"));
public XMLDBGetChildResources(XQueryContext context) {
super(context, signature);
}
//TODO decode names?
public Sequence evalWithCollection(Collection collection, Sequence[] args, Sequence contextSequence)
throws XPathException {
final ValueSequence result = new ValueSequence();
try {
final String[] collections = collection.listResources();
for(int i = 0; i < collections.length; i++) {
result.add(new StringValue(collections[i]));
}
return result;
} catch (final XMLDBException e) {
throw new XPathException(this, "Failed to retrieve child resources", e);
}
}
}