| 1 | /*
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| 2 | * Copyright 2001-2002,2004-2005 The Apache Software Foundation
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | *
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| 16 | */
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| 17 |
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| 18 | package org.apache.tools.ant.taskdefs.condition;
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| 19 |
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| 20 | import org.apache.tools.ant.BuildException;
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| 21 |
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| 22 | /**
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| 23 | * <not> condition.
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| 24 | *
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| 25 | * Evaluates to true if the single condition nested into it is false
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| 26 | * and vice versa.
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| 27 | *
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| 28 | * @since Ant 1.4
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| 29 | */
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| 30 | public class Not extends ConditionBase implements Condition {
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| 31 |
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| 32 | /**
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| 33 | * Evaluate condition
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| 34 | *
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| 35 | * @return true if the condition is true.
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| 36 | * @throws BuildException if the condition is not configured correctly.
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| 37 | */
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| 38 | public boolean eval() throws BuildException {
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| 39 | if (countConditions() > 1) {
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| 40 | throw new BuildException("You must not nest more than one "
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| 41 | + "condition into <not>");
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| 42 | }
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| 43 | if (countConditions() < 1) {
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| 44 | throw new BuildException("You must nest a condition into <not>");
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| 45 | }
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| 46 | return !((Condition) getConditions().nextElement()).eval();
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| 47 | }
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| 48 |
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| 49 | }
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