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.expression.logical;
16:
17: import org.araneaframework.backend.list.memorybased.Expression;
18: import org.araneaframework.backend.list.memorybased.ExpressionEvaluationException;
19: import org.araneaframework.backend.list.memorybased.expression.CompositeExpression;
20: import org.araneaframework.backend.list.memorybased.expression.VariableResolver;
21: import org.araneaframework.core.Assert;
22:
23: public class NotExpression implements CompositeExpression {
24:
25: private static final long serialVersionUID = 1L;
26:
27: private Expression expr;
28:
29: public NotExpression(Expression expr) {
30: Assert.notNullParam(this , expr, "expr");
31: this .expr = expr;
32: }
33:
34: public Expression[] getChildren() {
35: return new Expression[] { this .expr };
36: }
37:
38: public Object evaluate(VariableResolver resolver)
39: throws ExpressionEvaluationException {
40: Boolean childValue = (Boolean) this.expr.evaluate(resolver);
41: return (!childValue.booleanValue()) ? Boolean.TRUE
42: : Boolean.FALSE;
43: }
44: }
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