com.hazelcast.config.matcher.MatchingPointConfigPatternMatcher Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.config.matcher;
import com.hazelcast.config.ConfigPatternMatcher;
import com.hazelcast.config.ConfigurationException;
/**
* This ConfigPatternMatcher supports a simplified wildcard matching.
* See "Config.md ## Using Wildcard" for details about the syntax options.
*
* In addition the candidates are weighted by the best match. The best result is returned.
* Throws {@link com.hazelcast.config.ConfigurationException} is multiple configurations are found.
*/
public class MatchingPointConfigPatternMatcher implements ConfigPatternMatcher {
@Override
public String matches(Iterable configPatterns, String itemName) throws ConfigurationException {
String candidate = null;
String duplicate = null;
int lastMatchingPoint = -1;
for (String pattern : configPatterns) {
int matchingPoint = getMatchingPoint(pattern, itemName);
if (matchingPoint > -1 && matchingPoint >= lastMatchingPoint) {
if (matchingPoint == lastMatchingPoint) {
duplicate = candidate;
} else {
duplicate = null;
}
lastMatchingPoint = matchingPoint;
candidate = pattern;
}
}
if (duplicate != null) {
throw new ConfigurationException(itemName, candidate, duplicate);
}
return candidate;
}
/**
* This method returns higher values the better the matching is.
*
* @param pattern configuration pattern to match with
* @param itemName item name to match
* @return -1 if name does not match at all, zero or positive otherwise
*/
private int getMatchingPoint(String pattern, String itemName) {
int index = pattern.indexOf('*');
if (index == -1) {
return -1;
}
String firstPart = pattern.substring(0, index);
if (!itemName.startsWith(firstPart)) {
return -1;
}
String secondPart = pattern.substring(index + 1);
if (!itemName.endsWith(secondPart)) {
return -1;
}
return firstPart.length() + secondPart.length();
}
}