- /*
- * Copyright 2002-2004 The Apache Software Foundation
- *
- * Licensed 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;
- }
- }
-