| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| using System; |
| |
| namespace Apache.NMS.Selector |
| { |
| /// <summary> |
| /// An expression which performs an operation on one expression value. |
| /// </summary> |
| public abstract class UnaryExpression : IExpression |
| { |
| protected IExpression rightExpression; |
| public IExpression Right |
| { |
| get { return rightExpression; } |
| set { rightExpression = value; } |
| } |
| |
| protected abstract string ExpressionSymbol |
| { |
| get; |
| } |
| |
| public UnaryExpression(IExpression left) |
| { |
| this.rightExpression = left; |
| } |
| |
| public abstract object Evaluate(MessageEvaluationContext message); |
| |
| public override string ToString() |
| { |
| return "(" + ExpressionSymbol + " " + rightExpression.ToString() + ")"; |
| } |
| |
| public static IExpression CreateNegate(IExpression left) |
| { |
| return new NegateExpression(left); |
| } |
| |
| public static IBooleanExpression CreateNOT(IBooleanExpression left) |
| { |
| return new NOTExpression(left); |
| } |
| |
| public static IBooleanExpression CreateBooleanCast(IExpression left) |
| { |
| return new BooleanCastExpression(left); |
| } |
| } |
| } |