/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2015 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
*/
package org.exist.storage.md.xquery;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.dom.persistent.NodeProxy;
import org.exist.dom.QName;
import org.exist.storage.md.MetaData;
import org.exist.xquery.BasicFunction;
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.*;
import static org.exist.storage.md.MDStorageManager.*;
/**
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
* @author Casey Jordan <casey.jordan@jorsek.com>
*/
public class DocumentByUUID extends BasicFunction {
private static final QName NAME = new QName("document-by-uuid", NAMESPACE_URI, PREFIX);
private static final String DESCRIPTION = "Get the document by UUID.";
private static final FunctionReturnSequenceType RETURN = new FunctionReturnSequenceType(Type.ITEM, Cardinality.ZERO_OR_ONE, "Resources which have given UUID");
public final static FunctionSignature signatures[] = {
new FunctionSignature(
NAME,
DESCRIPTION,
new SequenceType[] {
new FunctionParameterSequenceType("UUID", Type.STRING, Cardinality.EXACTLY_ONE, "The UUID of the document you wish to fetch")
},
RETURN
)
};
/**
* @param context
*/
public DocumentByUUID(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
try {
DocumentImpl doc = MetaData.get().getDocument(args[0].getStringValue());
if (doc == null) return Sequence.EMPTY_SEQUENCE;
return new NodeProxy(doc);
} catch (Exception e) {
throw new XPathException(this, e);
}
}
}