001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.functions.string;
020
021import lucee.commons.lang.StringUtil;
022import lucee.runtime.PageContext;
023import lucee.runtime.exp.FunctionException;
024import lucee.runtime.exp.PageException;
025import lucee.runtime.functions.BIF;
026import lucee.runtime.op.Caster;
027
028/**
029 * implements the String member method isEmpty()
030 */
031public class StringIsEmpty extends BIF {
032
033        private static final long serialVersionUID = -85767818984230151L;
034
035        public static boolean call(PageContext pc , String value) {
036
037                return StringUtil.isEmpty(value);
038        }
039
040        @Override
041        public Object invoke(PageContext pc, Object[] args) throws PageException {
042
043                if (args.length != 1)
044                        throw new FunctionException(pc, "IsEmpty", 1, 1, args.length);
045
046                return call(pc, Caster.toString(args[0]));
047        }
048}