kafka StringExpander 源码
kafka StringExpander 代码
文件路径：/trogdor/src/main/java/org/apache/kafka/trogdor/common/StringExpander.java
/*
* 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.kafka.trogdor.common;
import java.util.HashSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utilities for expanding strings that have range expressions in them.
*
* For example, 'foo[1-3]' would be expaneded to foo1, foo2, foo3.
* Strings that have no range expressions will not be expanded.
*/
public class StringExpander {
private final static Pattern NUMERIC_RANGE_PATTERN =
Pattern.compile("(.*)\\[([0-9]*)\\-([0-9]*)\\](.*)");
public static HashSet<String> expand(String val) {
HashSet<String> set = new HashSet<>();
Matcher matcher = NUMERIC_RANGE_PATTERN.matcher(val);
if (!matcher.matches()) {
set.add(val);
return set;
}
String prequel = matcher.group(1);
String rangeStart = matcher.group(2);
String rangeEnd = matcher.group(3);
String epilog = matcher.group(4);
int rangeStartInt = Integer.parseInt(rangeStart);
int rangeEndInt = Integer.parseInt(rangeEnd);
if (rangeEndInt < rangeStartInt) {
throw new RuntimeException("Invalid range: start " + rangeStartInt +
" is higher than end " + rangeEndInt);
}
for (int i = rangeStartInt; i <= rangeEndInt; i++) {
set.add(String.format("%s%d%s", prequel, i, epilog));
}
return set;
}
}
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