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/*
* 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.
*
*/
package org.apache.tools.ant.types;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.FileUtils;
/**
* EnumeratedAttribute for time comparisons. Accepts values
* "before", "after", "equal".
* @since Ant 1.7
*/
public class TimeComparison extends EnumeratedAttribute {
private static final String[] VALUES
= new String[] {"before", "after", "equal"};
private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
/** Before Comparison. */
public static final TimeComparison BEFORE = new TimeComparison("before");
/** After Comparison. */
public static final TimeComparison AFTER = new TimeComparison("after");
/** Equal Comparison. */
public static final TimeComparison EQUAL = new TimeComparison("equal");
/**
* Default constructor.
*/
public TimeComparison() {
}
/**
* Construct a new TimeComparison with the specified value.
* @param value the EnumeratedAttribute value.
*/
public TimeComparison(String value) {
setValue(value);
}
/**
* Return the possible values.
* @return String[] of EnumeratedAttribute values.
*/
public String[] getValues() {
return VALUES;
}
/**
* Evaluate two times against this TimeComparison.
* @param t1 the first time to compare.
* @param t2 the second time to compare.
* @return true if the comparison result fell within the parameters of this TimeComparison.
*/
public boolean evaluate(long t1, long t2) {
return evaluate(t1, t2, FILE_UTILS.getFileTimestampGranularity());
}
/**
* Evaluate two times against this TimeComparison.
* @param t1 the first time to compare.
* @param t2 the second time to compare.
* @param g the timestamp granularity.
* @return true if the comparison result fell within the parameters of this TimeComparison.
*/
public boolean evaluate(long t1, long t2, long g) {
int cmp = getIndex();
if (cmp == -1) {
throw new BuildException("TimeComparison value not set.");
}
if (cmp == 0) {
return t1 - g < t2;
}
if (cmp == 1) {
return t1 + g > t2;
}
return Math.abs(t1 - t2) <= g;
}
/**
* Compare two times.
* @param t1 the first time to compare.
* @param t2 the second time to compare.
* @return a negative integer, a positive integer, or zero as t1 is
* before, after, or equal to t2 accounting for the default granularity.
*/
public static int compare(long t1, long t2) {
return compare(t1, t2, FILE_UTILS.getFileTimestampGranularity());
}
/**
* Compare two times.
* @param t1 the first time to compare.
* @param t2 the second time to compare.
* @param g the timestamp granularity.
* @return a negative integer, a positive integer, or zero as t1 is
* before, after, or equal to t2 accounting for the specified granularity.
*/
public static int compare(long t1, long t2, long g) {
long diff = t1 - t2;
long abs = Math.abs(diff);
return abs > Math.abs(g) ? (int) (diff / abs) : 0;
}
}
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