| /* |
| * 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> |
| /// A filter performing a substraction of two expressions. |
| /// </summary> |
| public class MinusExpression : ArithmeticExpression |
| { |
| protected override string ExpressionSymbol |
| { |
| get { return "-"; } |
| } |
| |
| public MinusExpression(IExpression left, IExpression right) |
| : base(left, right) |
| { |
| } |
| |
| public override object Evaluate(MessageEvaluationContext message) |
| { |
| object lvalue = Left.Evaluate(message); |
| if(lvalue == null) return null; |
| |
| object rvalue = Right.Evaluate(message); |
| if(rvalue == null) return null; |
| |
| AlignedNumericValues values = new AlignedNumericValues(lvalue, rvalue); |
| |
| object result = null; |
| |
| switch(values.TypeEnum) |
| { |
| case AlignedNumericValues.T.SByteType : result = (sbyte )values.Left - (sbyte )values.Right; break; |
| case AlignedNumericValues.T.ByteType : result = (byte )values.Left - (byte )values.Right; break; |
| case AlignedNumericValues.T.CharType : result = (char )values.Left - (char )values.Right; break; |
| case AlignedNumericValues.T.ShortType : result = (short )values.Left - (short )values.Right; break; |
| case AlignedNumericValues.T.UShortType: result = (ushort)values.Left - (ushort)values.Right; break; |
| case AlignedNumericValues.T.IntType : result = (int )values.Left - (int )values.Right; break; |
| case AlignedNumericValues.T.UIntType : result = (uint )values.Left - (uint )values.Right; break; |
| case AlignedNumericValues.T.LongType : result = (long )values.Left - (long )values.Right; break; |
| case AlignedNumericValues.T.ULongType : result = (ulong )values.Left - (ulong )values.Right; break; |
| case AlignedNumericValues.T.FloatType : result = (float )values.Left - (float )values.Right; break; |
| case AlignedNumericValues.T.DoubleType: result = (double)values.Left - (double)values.Right; break; |
| } |
| |
| return result; |
| } |
| } |
| } |