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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/Quantifier.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/Quantifier.java | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/Quantifier.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/Quantifier.java new file mode 100644 index 00000000..ac1b84ce --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/Quantifier.java @@ -0,0 +1,146 @@ +/* + * 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); + } + +} + |