| 1 | /*
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| 2 | * Copyright 2003-2004 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.types.selectors.modifiedselector;
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| 19 |
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| 20 |
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| 21 | import java.io.File;
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| 22 |
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| 23 |
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| 24 | /**
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| 25 | * The <i>Algorithm</i> defines how a value for a file is computed.
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| 26 | * It must be sure that multiple calls for the same file results in the
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| 27 | * same value.
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| 28 | * The implementing class should implement a useful toString() method.
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| 29 | *
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| 30 | * @version 2003-09-13
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| 31 | * @since Ant 1.6
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| 32 | */
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| 33 | public interface Algorithm {
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| 34 |
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| 35 | /**
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| 36 | * Checks its prerequisites.
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| 37 | * @return <i>true</i> if all is ok, otherwise <i>false</i>.
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| 38 | */
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| 39 | boolean isValid();
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| 40 |
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| 41 | /**
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| 42 | * Get the value for a file.
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| 43 | * @param file File object for which the value should be evaluated.
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| 44 | * @return The value for that file
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| 45 | */
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| 46 | String getValue(File file);
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| 47 | }
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