/*
* 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.
*/
package com.navercorp.pinpoint.common.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;
public class StringUtils {
private static final int DEFAULT_ABBREVIATE_MAX_WIDTH = 64;
private static final String NULL_STRING = "null";
public StringUtils() {
throw new AssertionError();
}
public static String defaultString(final String str, final String defaultStr) {
return str == null ? defaultStr : str;
}
public static boolean isEmpty(final String string) {
return string == null || string.isEmpty();
}
public static boolean isNotEmpty(final String string) {
return string != null && string.length() > 0;
}
public static String toString(final Object object) {
if (object == null) {
return NULL_STRING;
}
return object.toString();
}
public static String abbreviate(final String str) {
return abbreviate(str, DEFAULT_ABBREVIATE_MAX_WIDTH);
}
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;
}
}
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);
}
}
private static void appendAbbreviateMessage(final StringBuilder buffer, final int strLength) {
buffer.append("...(");
buffer.append(strLength);
buffer.append(')');
}
/**
* 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);
}
/**
* 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) {
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;
}
}