01: /**
02: * Copyright 2006 Webmedia Group Ltd.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: **/package org.araneaframework.backend.list.memorybased.compexpr;
16:
17: import org.araneaframework.backend.list.memorybased.ComparatorExpression;
18: import org.araneaframework.backend.list.memorybased.ExpressionEvaluationException;
19: import org.araneaframework.backend.list.memorybased.expression.VariableResolver;
20:
21: /**
22: * ComparatorExpression that reverses another ComparatorExpression comparation
23: * result.
24: */
25: public class ReverseComparatorExpression implements
26: CompositeComparatorExpression {
27:
28: private static final long serialVersionUID = 1L;
29:
30: protected ComparatorExpression expression;
31:
32: public ReverseComparatorExpression(ComparatorExpression expression) {
33: if (expression == null) {
34: throw new RuntimeException("Expression must be provided");
35: }
36: this .expression = expression;
37: }
38:
39: public int compare(VariableResolver resolver1,
40: VariableResolver resolver2)
41: throws ExpressionEvaluationException {
42: return this .expression.compare(resolver2, resolver1);
43: }
44:
45: public ComparatorExpression[] getChildren() {
46: return new ComparatorExpression[] { this.expression };
47: }
48:
49: }
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