| /* |
| * 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.selectors; |
| |
| import java.io.File; |
| import java.util.Enumeration; |
| |
| /** |
| * This selector is here just to shake up your thinking a bit. Don't get |
| * too caught up in boolean, there are other ways you can evaluate a |
| * collection of selectors. This one takes a vote of the selectors it |
| * contains, and majority wins. You could also have an "all-but-one" |
| * selector, a "weighted-average" selector, and so on. These are left |
| * as exercises for the reader (as are the usecases where this would |
| * be necessary). |
| * |
| * @since 1.5 |
| */ |
| public class MajoritySelector extends BaseSelectorContainer { |
| |
| private boolean allowtie = true; |
| |
| /** |
| * Default constructor. |
| */ |
| public MajoritySelector() { |
| } |
| |
| /** |
| * @return a string describing this object |
| */ |
| public String toString() { |
| StringBuffer buf = new StringBuffer(); |
| if (hasSelectors()) { |
| buf.append("{majorityselect: "); |
| buf.append(super.toString()); |
| buf.append("}"); |
| } |
| return buf.toString(); |
| } |
| |
| /** |
| * A attribute to specify what will happen if number |
| * of yes votes is the same as the number of no votes |
| * defaults to true |
| * |
| * @param tiebreaker the value to give if there is a tie |
| */ |
| public void setAllowtie(boolean tiebreaker) { |
| allowtie = tiebreaker; |
| } |
| |
| /** |
| * Returns true (the file is selected) if most of the other selectors |
| * agree. In case of a tie, go by the allowtie setting. That defaults |
| * to true, meaning in case of a tie, the file is selected. |
| * |
| * @param basedir the base directory the scan is being done from |
| * @param filename is the name of the file to check |
| * @param file is a java.io.File object for the filename that the selector |
| * can use |
| * @return whether the file should be selected or not |
| */ |
| public boolean isSelected(File basedir, String filename, File file) { |
| validate(); |
| int yesvotes = 0; |
| int novotes = 0; |
| Enumeration e = selectorElements(); |
| boolean result; |
| |
| while (e.hasMoreElements()) { |
| result = ((FileSelector) e.nextElement()).isSelected(basedir, |
| filename, file); |
| if (result) { |
| yesvotes = yesvotes + 1; |
| } else { |
| novotes = novotes + 1; |
| } |
| } |
| if (yesvotes > novotes) { |
| return true; |
| } else if (novotes > yesvotes) { |
| return false; |
| } |
| // At this point, we know we have a tie. |
| return allowtie; |
| } |
| } |
| |