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.interpreter.ref.op;
020
021import lucee.runtime.PageContext;
022import lucee.runtime.exp.PageException;
023import lucee.runtime.interpreter.ref.Ref;
024import lucee.runtime.interpreter.ref.RefSupport;
025import lucee.runtime.interpreter.ref.literal.LFunctionValue;
026import lucee.runtime.interpreter.ref.var.Variable;
027
028public class Elvis  extends RefSupport implements Ref{
029
030        private Ref left;
031        private Ref right;
032
033        public Elvis(Ref left, Ref right) {
034                this.left=left;
035                this.right=right; 
036        }
037
038
039    @Override
040        public Object getValue(PageContext pc) throws PageException {
041        if(left instanceof Variable) {
042                Variable var = (Variable)left;
043                String[] arr = LFunctionValue.toStringArray(pc, var);
044                return lucee.runtime.op.Elvis.operate(pc, arr)?left.getValue(pc):right.getValue(pc);
045        }
046        
047        Object val = left.getValue(pc);
048        if(val!=null) return val;
049        return right.getValue(pc);
050        
051    }
052
053    @Override
054    public String getTypeName() {
055        return "operation";
056    }
057}