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Admin4J is a set of application administration utilities that will assist with providing alerts for thread contention, memory issues, performance issues. In addition, it provides a console for changing log levels at runtime.

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/*
 * 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 net.admin4j.deps.commons.lang3;

/**
 * 

Operations on {@code CharSet} instances.

* *

This class handles {@code null} input gracefully. * An exception will not be thrown for a {@code null} input. * Each method documents its behaviour in more detail.

* *

#ThreadSafe#

* @see CharSet * @since 1.0 * @version $Id: CharSetUtils.java 1144916 2011-07-10 17:50:21Z ggregory $ */ public class CharSetUtils { /** *

CharSetUtils instances should NOT be constructed in standard programming. * Instead, the class should be used as {@code CharSetUtils.evaluateSet(null);}.

* *

This constructor is public to permit tools that require a JavaBean instance * to operate.

*/ public CharSetUtils() { super(); } // Squeeze //----------------------------------------------------------------------- /** *

Squeezes any repetitions of a character that is mentioned in the * supplied set.

* *
     * CharSetUtils.squeeze(null, *)        = null
     * CharSetUtils.squeeze("", *)          = ""
     * CharSetUtils.squeeze(*, null)        = *
     * CharSetUtils.squeeze(*, "")          = *
     * CharSetUtils.squeeze("hello", "k-p") = "helo"
     * CharSetUtils.squeeze("hello", "a-e") = "hello"
     * 
* * @see CharSet#getInstance(java.lang.String...) for set-syntax. * @param str the string to squeeze, may be null * @param set the character set to use for manipulation, may be null * @return the modified String, {@code null} if null string input */ public static String squeeze(String str, String... set) { if (StringUtils.isEmpty(str) || deepEmpty(set)) { return str; } CharSet chars = CharSet.getInstance(set); StringBuilder buffer = new StringBuilder(str.length()); char[] chrs = str.toCharArray(); int sz = chrs.length; char lastChar = ' '; char ch = ' '; for (int i = 0; i < sz; i++) { ch = chrs[i]; // Compare with contains() last for performance. if (ch == lastChar && i != 0 && chars.contains(ch)) { continue; } buffer.append(ch); lastChar = ch; } return buffer.toString(); } // Count //----------------------------------------------------------------------- /** *

Takes an argument in set-syntax, see evaluateSet, * and returns the number of characters present in the specified string.

* *
     * CharSetUtils.count(null, *)        = 0
     * CharSetUtils.count("", *)          = 0
     * CharSetUtils.count(*, null)        = 0
     * CharSetUtils.count(*, "")          = 0
     * CharSetUtils.count("hello", "k-p") = 3
     * CharSetUtils.count("hello", "a-e") = 1
     * 
* * @see CharSet#getInstance(java.lang.String...) for set-syntax. * @param str String to count characters in, may be null * @param set String[] set of characters to count, may be null * @return the character count, zero if null string input */ public static int count(String str, String... set) { if (StringUtils.isEmpty(str) || deepEmpty(set)) { return 0; } CharSet chars = CharSet.getInstance(set); int count = 0; for (char c : str.toCharArray()) { if (chars.contains(c)) { count++; } } return count; } // Keep //----------------------------------------------------------------------- /** *

Takes an argument in set-syntax, see evaluateSet, * and keeps any of characters present in the specified string.

* *
     * CharSetUtils.keep(null, *)        = null
     * CharSetUtils.keep("", *)          = ""
     * CharSetUtils.keep(*, null)        = ""
     * CharSetUtils.keep(*, "")          = ""
     * CharSetUtils.keep("hello", "hl")  = "hll"
     * CharSetUtils.keep("hello", "le")  = "ell"
     * 
* * @see CharSet#getInstance(java.lang.String...) for set-syntax. * @param str String to keep characters from, may be null * @param set String[] set of characters to keep, may be null * @return the modified String, {@code null} if null string input * @since 2.0 */ public static String keep(String str, String... set) { if (str == null) { return null; } if (str.length() == 0 || deepEmpty(set)) { return ""; } return modify(str, set, true); } // Delete //----------------------------------------------------------------------- /** *

Takes an argument in set-syntax, see evaluateSet, * and deletes any of characters present in the specified string.

* *
     * CharSetUtils.delete(null, *)        = null
     * CharSetUtils.delete("", *)          = ""
     * CharSetUtils.delete(*, null)        = *
     * CharSetUtils.delete(*, "")          = *
     * CharSetUtils.delete("hello", "hl")  = "eo"
     * CharSetUtils.delete("hello", "le")  = "ho"
     * 
* * @see CharSet#getInstance(java.lang.String...) for set-syntax. * @param str String to delete characters from, may be null * @param set String[] set of characters to delete, may be null * @return the modified String, {@code null} if null string input */ public static String delete(String str, String... set) { if (StringUtils.isEmpty(str) || deepEmpty(set)) { return str; } return modify(str, set, false); } //----------------------------------------------------------------------- /** * Implementation of delete and keep * * @param str String to modify characters within * @param set String[] set of characters to modify * @param expect whether to evaluate on match, or non-match * @return the modified String, not null */ private static String modify(String str, String[] set, boolean expect) { CharSet chars = CharSet.getInstance(set); StringBuilder buffer = new StringBuilder(str.length()); char[] chrs = str.toCharArray(); int sz = chrs.length; for(int i=0; i




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