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/*
 *  Copyright 2008 biaoping.yin
 *
 *  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 com.frameworkset.util;

/**
 * Title: PatternMatchUtils.java 
 * Description: 
 * bboss workgroup
 * Copyright (c) 2008
 * @Date 2010-9-29
 * @author biaoping.yin
 * @version 1.0
 */
public abstract class PatternMatchUtils {
	/**
	 * Match a String against the given pattern, supporting the following simple
	 * pattern styles: "xxx*", "*xxx", "*xxx*" and "xxx*yyy" matches (with an
	 * arbitrary number of pattern parts), as well as direct equality.
	 * @param pattern the pattern to match against
	 * @param str the String to match
	 * @return whether the String matches the given pattern
	 */
	public static boolean simpleMatch(String pattern, String str) {
		if (pattern == null || str == null) {
			return false;
		}
		int firstIndex = pattern.indexOf('*');
		if (firstIndex == -1) {
			return pattern.equals(str);
		}
		if (firstIndex == 0) {
			if (pattern.length() == 1) {
				return true;
			}
			int nextIndex = pattern.indexOf('*', firstIndex + 1);
			if (nextIndex == -1) {
				return str.endsWith(pattern.substring(1));
			}
			String part = pattern.substring(1, nextIndex);
			int partIndex = str.indexOf(part);
			while (partIndex != -1) {
				if (simpleMatch(pattern.substring(nextIndex), str.substring(partIndex + part.length()))) {
					return true;
				}
				partIndex = str.indexOf(part, partIndex + 1);
			}
			return false;
		}
		return (str.length() >= firstIndex &&
				pattern.substring(0, firstIndex).equals(str.substring(0, firstIndex)) &&
				simpleMatch(pattern.substring(firstIndex), str.substring(firstIndex)));
	}

	/**
	 * Match a String against the given patterns, supporting the following simple
	 * pattern styles: "xxx*", "*xxx", "*xxx*" and "xxx*yyy" matches (with an
	 * arbitrary number of pattern parts), as well as direct equality.
	 * @param patterns the patterns to match against
	 * @param str the String to match
	 * @return whether the String matches any of the given patterns
	 */
	public static boolean simpleMatch(String[] patterns, String str) {
		if (patterns != null) {
			for (int i = 0; i < patterns.length; i++) {
				if (simpleMatch(patterns[i], str)) {
					return true;
				}
			}
		}
		return false;
	}

}