/*
 * 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.xmldb.UserManagementService;
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.FunctionParameterSequenceType;
import org.exist.xquery.value.IntegerValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.Resource;
import org.xmldb.api.base.XMLDBException;

/**
 * Implements eXist's xmldb:chmod-resource() function.
 * 
 * @author wolf
 * @author Luigi P. Bai, finder@users.sf.net, 2004
 *
 */


public class XMLDBChmodResource extends XMLDBAbstractCollectionManipulator {
    private static final Logger logger = Logger.getLogger(XMLDBChmodResource.class);
    public final static FunctionSignature signature =
	new FunctionSignature(
			      new QName("chmod-resource", XMLDBModule.NAMESPACE_URI, XMLDBModule.PREFIX),
			      "Sets the mode of the resource $resource in collection $collection, $mode is the mode as xs:integer. " +
			      XMLDBModule.REMEMBER_OCTAL_CALC,
			      new SequenceType[] {
				  new FunctionParameterSequenceType("collection", Type.STRING, Cardinality.EXACTLY_ONE, "The collection"),
				  new FunctionParameterSequenceType("resource", Type.STRING, Cardinality.EXACTLY_ONE, "The resource"),
				  new FunctionParameterSequenceType("mode", Type.INTEGER, Cardinality.EXACTLY_ONE, "The mode as xs:integer"),
			      },
			      new SequenceType(Type.ITEM, Cardinality.EMPTY));

	
    public XMLDBChmodResource(XQueryContext context) {
	super(context, signature);
    }
	
    /* (non-Javadoc)
     * @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
     *
     */
	
    public Sequence evalWithCollection(Collection collection, Sequence[] args, Sequence contextSequence)
	throws XPathException {
        try {
            Resource res = collection.getResource(args[1].getStringValue());
            if (res != null) {
                UserManagementService ums = (UserManagementService) collection.getService("UserManagementService", "1.0");
                ums.chmod(res, ((IntegerValue) args[2].convertTo(Type.INTEGER)).getInt());
            } else {
		logger.error("Unable to locate resource "+args[1].getStringValue());
                throw new XPathException(this, "Unable to locate resource "+args[1].getStringValue());
            }
        } catch (XMLDBException xe) {
	    logger.error("Unable to change resource permissions", xe);
            throw new XPathException(this, "Unable to change resource permissions", xe);
        }
	return Sequence.EMPTY_SEQUENCE;
    }

}