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/*
* Copyright 2011-2012 the original author or authors.
*
* 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.gemstone.gemfire.management.internal.cli.util.spring;
/**
* Replaces org.springframework.shell.support.util.StringUtils which
* is now removed from SPring Shell & the same class is referred from Spring
* Core. With this we can avoid GemFire member's runtime dependency on Spring
* Core.
*/
/*
* Code selectively taken from the original org.springframework.shell.support.util.StringUtils
*/
public class StringUtils {
/**
*
* Removes leading and trailing whitespace from both ends of this String returning an empty String ("") if the String is empty after the trim or if it is null.
*
*
* StringUtils.trimToNull(null) = ""
* StringUtils.trimToNull("") = ""
* StringUtils.trimToNull(" ") = ""
* StringUtils.trimToNull("abc") = "abc"
* StringUtils.trimToNull(" abc ") = "abc"
*
*
* @param str the String to be trimmed, may be null
* @return the trimmed String, an empty String("") if only chars <= 32, empty or null String input
* @since 1.1
*/
public static String trimToEmpty(final String str) {
String ts = trimWhitespace(str);
return !hasText(ts) ? "" : ts;
}
/**
* Trim leading and trailing whitespace from the given String.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimWhitespace(final String str) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
//---------------------------------------------------------------------
// General convenience methods for working with Strings
//---------------------------------------------------------------------
/**
* Check that the given CharSequence is neither null nor of length 0.
* Note: Will return true for a CharSequence that purely consists of whitespace.
*
* StringUtils.hasLength(null) = false
* StringUtils.hasLength("") = false
* StringUtils.hasLength(" ") = true
* StringUtils.hasLength("Hello") = true
*
* @param str the CharSequence to check (may be null)
* @return true if the CharSequence is not null and has length
* @see #hasText(String)
*/
public static boolean hasLength(final CharSequence str) {
return (str != null && str.length() > 0);
}
/**
* Check that the given String is neither null nor of length 0.
* Note: Will return true for a String that purely consists of whitespace.
* @param str the String to check (may be null)
* @return true if the String is not null and has length
* @see #hasLength(CharSequence)
*/
public static boolean hasLength(final String str) {
return hasLength((CharSequence) str);
}
/**
* Check whether the given CharSequence has actual text.
* More specifically, returns true if the string not null,
* its length is greater than 0, and it contains at least one non-whitespace character.
*
* StringUtils.hasText(null) = false
* StringUtils.hasText("") = false
* StringUtils.hasText(" ") = false
* StringUtils.hasText("12345") = true
* StringUtils.hasText(" 12345 ") = true
*
* @param str the CharSequence to check (may be null)
* @return true if the CharSequence is not null,
* its length is greater than 0, and it does not contain whitespace only
* @see java.lang.Character#isWhitespace
*/
public static boolean hasText(final CharSequence str) {
if (!hasLength(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Check whether the given String has actual text.
* More specifically, returns true if the string not null,
* its length is greater than 0, and it contains at least one non-whitespace character.
* @param str the String to check (may be null)
* @return true if the String is not null, its length is
* greater than 0, and it does not contain whitespace only
* @see #hasText(CharSequence)
*/
public static boolean hasText(final String str) {
return hasText((CharSequence) str);
}
/**
* Removes the given prefix from the given string, if it exists
*
* @param str the string to modify (can be blank to do nothing)
* @param prefix the prefix to remove (can be blank to do nothing)
* @return null if a null string was given
* @since 1.2.0
*/
public static String removePrefix(final String str, final String prefix) {
if (!hasText(str) || !hasText(prefix) || !str.startsWith(prefix)) {
return str;
}
return str.substring(prefix.length());
}
/**
* Removes the given suffix from the given string, if it exists
*
* @param str the string to modify (can be blank to do nothing)
* @param suffix the suffix to remove (can be blank to do nothing)
* @return null if a null string was given
* @since 1.2.0
*/
public static String removeSuffix(final String str, final String suffix) {
if (!hasText(str) || !hasText(suffix) || !str.endsWith(suffix)) {
return str;
}
return str.substring(0, str.length() - suffix.length());
}
/**
* Trim trailing whitespace from the given String.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimTrailingWhitespace(final String str) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
/**
* Test if the given String ends with the specified suffix,
* ignoring upper/lower case.
* @param str the String to check
* @param suffix the suffix to look for
* @see java.lang.String#endsWith
*/
public static boolean endsWithIgnoreCase(final String str, final String suffix) {
if (str == null || suffix == null) {
return false;
}
if (str.endsWith(suffix)) {
return true;
}
if (str.length() < suffix.length()) {
return false;
}
String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
String lcSuffix = suffix.toLowerCase();
return lcStr.equals(lcSuffix);
}
}