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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;
/**
* EnumeratedAttribute for quantifier comparisons. Evaluates a
* <code>boolean[]</code> or raw <code>true</code> and <code>false</code>
* counts. Accepts the following values:<ul>
* <li>"all"</li> - none <code>false</code>
* <li>"each"</li> - none <code>false</code>
* <li>"every"</li> - none <code>false</code>
* <li>"any"</li> - at least one <code>true</code>
* <li>"some"</li> - at least one <code>true</code>
* <li>"one"</li> - exactly one <code>true</code>
* <li>"majority"</li> - more <code>true</code> than <code>false</code>
* <li>"most"</li> - more <code>true</code> than <code>false</code>
* <li>"none"</li> - none <code>true</code>
* </ul>
* @since Ant 1.7
*/
public class Quantifier extends EnumeratedAttribute {
private static final String[] VALUES
= new String[] {"all", "each", "every", "any", "some", "one",
"majority", "most", "none"};
/** ALL instance */
public static final Quantifier ALL = new Quantifier("all");
/** ANY instance */
public static final Quantifier ANY = new Quantifier("any");
/** ONE instance */
public static final Quantifier ONE = new Quantifier("one");
/** MAJORITY instance */
public static final Quantifier MAJORITY = new Quantifier("majority");
/** NONE instance */
public static final Quantifier NONE = new Quantifier("none");
private abstract static class Predicate {
abstract boolean eval(int t, int f);
}
private static final Predicate ALL_PRED = new Predicate() {
boolean eval(int t, int f) { return f == 0; }
};
private static final Predicate ANY_PRED = new Predicate() {
boolean eval(int t, int f) { return t > 0; }
};
private static final Predicate ONE_PRED = new Predicate() {
boolean eval(int t, int f) { return t == 1; }
};
private static final Predicate MAJORITY_PRED = new Predicate() {
boolean eval(int t, int f) { return t > f; }
};
private static final Predicate NONE_PRED = new Predicate() {
boolean eval(int t, int f) { return t == 0; }
};
private static final Predicate[] PREDS = new Predicate[VALUES.length];
static {
// CheckStyle:MagicNumber OFF
PREDS[0] = ALL_PRED;
PREDS[1] = ALL_PRED;
PREDS[2] = ALL_PRED;
PREDS[3] = ANY_PRED;
PREDS[4] = ANY_PRED;
PREDS[5] = ONE_PRED;
PREDS[6] = MAJORITY_PRED;
PREDS[7] = MAJORITY_PRED;
PREDS[8] = NONE_PRED;
// CheckStyle:MagicNumber ON
}
/**
* Default constructor.
*/
public Quantifier() {
}
/**
* Construct a new Quantifier with the specified value.
* @param value the EnumeratedAttribute value.
*/
public Quantifier(String value) {
setValue(value);
}
/**
* Return the possible values.
* @return String[] of EnumeratedAttribute values.
*/
public String[] getValues() {
return VALUES;
}
/**
* Evaluate a <code>boolean<code> array.
* @param b the <code>boolean[]</code> to evaluate.
* @return true if the argument fell within the parameters of this Quantifier.
*/
public boolean evaluate(boolean[] b) {
int t = 0;
for (int i = 0; i < b.length; i++) {
if (b[i]) {
t++;
}
}
return evaluate(t, b.length - t);
}
/**
* Evaluate integer <code>true</code> vs. <code>false</code> counts.
* @param t the number of <code>true</code> values.
* @param f the number of <code>false</code> values.
* @return true if the arguments fell within the parameters of this Quantifier.
*/
public boolean evaluate(int t, int f) {
int index = getIndex();
if (index == -1) {
throw new BuildException("Quantifier value not set.");
}
return PREDS[index].eval(t, f);
}
}
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