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[pinpoint-apm#2815] Enhancement StringUtils
- Add isNotEmpty()
- Move from bootstrap-core module to commons module
- Deprecate StringUtils of bootstrap-core module
- Change splitAndTrim() API
- splitAndTrim() -> tokenizeToStringList()
- Copy from spring framework- Loading branch information
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154 changes: 154 additions & 0 deletions
154
commons/src/main/java/com/navercorp/pinpoint/common/util/StringUtils.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,154 @@ | ||
| /* | ||
| * Copyright 2017 NAVER Corp. | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.navercorp.pinpoint.common.util; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.StringTokenizer; | ||
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| public class StringUtils { | ||
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| private static final int DEFAULT_ABBREVIATE_MAX_WIDTH = 64; | ||
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| private static final String NULL_STRING = "null"; | ||
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| public StringUtils() { | ||
| throw new AssertionError(); | ||
| } | ||
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| public static String defaultString(final String str, final String defaultStr) { | ||
| return str == null ? defaultStr : str; | ||
| } | ||
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| public static boolean isEmpty(final String string) { | ||
| return string == null || string.isEmpty(); | ||
| } | ||
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| public static boolean isNotEmpty(final String string) { | ||
| return string != null && string.length() > 0; | ||
| } | ||
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| public static String toString(final Object object) { | ||
| if (object == null) { | ||
| return NULL_STRING; | ||
| } | ||
| return object.toString(); | ||
| } | ||
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| public static String abbreviate(final String str) { | ||
| return abbreviate(str, DEFAULT_ABBREVIATE_MAX_WIDTH); | ||
| } | ||
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| public static String abbreviate(final String str, final int maxWidth) { | ||
| if (str == null) { | ||
| return NULL_STRING; | ||
| } | ||
| if (maxWidth < 0) { | ||
| throw new IllegalArgumentException("negative maxWidth:" + maxWidth); | ||
| } | ||
| if (str.length() > maxWidth) { | ||
| StringBuilder buffer = new StringBuilder(maxWidth + 10); | ||
| buffer.append(str, 0, maxWidth); | ||
| appendAbbreviateMessage(buffer, str.length()); | ||
| return buffer.toString(); | ||
| } else { | ||
| return str; | ||
| } | ||
| } | ||
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| public static void appendAbbreviate(final StringBuilder builder, final String str, final int maxWidth) { | ||
| if (str == null) { | ||
| return; | ||
| } | ||
| if (maxWidth < 0) { | ||
| return; | ||
| } | ||
| if (str.length() > maxWidth) { | ||
| builder.append(str, 0, maxWidth); | ||
| appendAbbreviateMessage(builder, str.length()); | ||
| } else { | ||
| builder.append(str); | ||
| } | ||
| } | ||
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| private static void appendAbbreviateMessage(final StringBuilder buffer, final int strLength) { | ||
| buffer.append("...("); | ||
| buffer.append(strLength); | ||
| buffer.append(')'); | ||
| } | ||
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| /** | ||
| * Copy Spring Framework StringUtils | ||
| * | ||
| * <p>Tokenize the given String into a String array via a StringTokenizer. | ||
| * Trims tokens and omits empty tokens. | ||
| * <p>The given delimiters string is supposed to consist of any number of | ||
| * delimiter characters. Each of those characters can be used to separate | ||
| * tokens. A delimiter is always a single character; for multi-character | ||
| * delimiters, consider using {@code delimitedListToStringArray} | ||
| * @param str the String to tokenize | ||
| * @param delimiters the delimiter characters, assembled as String | ||
| * (each of those characters is individually considered as delimiter). | ||
| * @return List of the tokens | ||
| * @see java.util.StringTokenizer | ||
| * @see String#trim() | ||
| */ | ||
| public static List<String> tokenizeToStringList(final String str, final String delimiters) { | ||
| return tokenizeToStringList(str, delimiters, true, true); | ||
| } | ||
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| /** | ||
| * Spring Framework StringUtils | ||
| * | ||
| * <p>Tokenize the given String into a String array via a StringTokenizer. | ||
| * Trims tokens and omits empty tokens. | ||
| * <p>The given delimiters string is supposed to consist of any number of | ||
| * delimiter characters. Each of those characters can be used to separate | ||
| * tokens. A delimiter is always a single character; for multi-character | ||
| * delimiters, consider using {@code delimitedListToStringArray} | ||
| * @param str the String to tokenize | ||
| * @param delimiters the delimiter characters, assembled as String | ||
| * (each of those characters is individually considered as delimiter). | ||
| * @return List of the tokens | ||
| * @see java.util.StringTokenizer | ||
| * @see String#trim() | ||
| */ | ||
| public static List<String> tokenizeToStringList(final String str, final String delimiters, final boolean trimTokens, final boolean ignoreEmptyTokens) { | ||
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| if (isEmpty(str)) { | ||
| return Collections.emptyList(); | ||
| } | ||
| StringTokenizer st = new StringTokenizer(str, delimiters); | ||
| List<String> tokens = new ArrayList<String>(); | ||
| while (st.hasMoreTokens()) { | ||
| String token = st.nextToken(); | ||
| if (trimTokens) { | ||
| token = token.trim(); | ||
| } | ||
| if (!ignoreEmptyTokens || token.length() > 0) { | ||
| tokens.add(token); | ||
| } | ||
| } | ||
| return tokens; | ||
| } | ||
| } |
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