001    package railo.runtime.op;
002    
003    import railo.runtime.PageContext;
004    import railo.runtime.interpreter.VariableInterpreter;
005    import railo.runtime.type.Collection;
006    import railo.runtime.type.KeyImpl;
007    import railo.runtime.type.scope.Scope;
008    import railo.runtime.util.VariableUtilImpl;
009    
010    public class Elvis {
011            
012            /**
013             *  called by the Elvis operator from generated bytecode
014             * @param pc
015             * @param scope
016             * @param varNames
017             * @return
018             */
019            public static boolean operate(PageContext pc , double scope,Collection.Key[] varNames) {
020                    return _operate(pc, scope, varNames,0); 
021            }
022    
023            /**
024             *  called by the Elvis operator from generated bytecode
025             * @param pc
026             * @param scope
027             * @param varNames
028             * @return
029             */
030            public static boolean operate(PageContext pc , double scope,String[] varNames) {
031                    return _operate(pc, scope, KeyImpl.toKeyArray(varNames),0);
032            }
033            
034            /**
035             *  called by the Elvis operator from the interpreter
036             * @param pc
037             * @param scope
038             * @param varNames
039             * @return
040             */
041            public static boolean operate(PageContext pc , String[] varNames) {
042                    int scope = VariableInterpreter.scopeString2Int(varNames[0]);
043                    return _operate(pc, scope, KeyImpl.toKeyArray(varNames), scope==Scope.SCOPE_UNDEFINED?0:1);
044            }
045            
046            private static boolean _operate(PageContext pc , double scope,Collection.Key[] varNames, int startIndex) {
047                    Object defVal=null;
048                    try {
049                            Object coll =VariableInterpreter.scope(pc, (int)scope, false); 
050                            //Object coll =pc.scope((int)scope);
051                            VariableUtilImpl vu = ((VariableUtilImpl)pc.getVariableUtil());
052                            for(int i=startIndex;i<varNames.length;i++) {
053                                    coll=vu.getCollection(pc,coll,varNames[i],defVal);
054                                    if(coll==defVal)return false;
055                            }
056                    } catch (Throwable t) {
057                    return false;
058                }
059                    return true; 
060            }
061    }