opennlp.tools.util.StringUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreemnets. 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 opennlp.tools.util;
public class StringUtil {
/**
* Determines if the specified character is a whitespace.
*
* A character is considered a whitespace when one
* of the following conditions is meet:
*
*
* - Its a {@link Character#isWhitespace(int)} whitespace.
* - Its a part of the Unicode Zs category ({@link Character#SPACE_SEPARATOR}).
*
*
* Character.isWhitespace(int) does not include no-break spaces.
* In OpenNLP no-break spaces are also considered as white spaces.
*
* @param charCode
* @return true if white space otherwise false
*/
public static boolean isWhitespace(char charCode) {
return Character.isWhitespace(charCode) ||
Character.getType(charCode) == Character.SPACE_SEPARATOR;
}
/**
* Determines if the specified character is a whitespace.
*
* A character is considered a whitespace when one
* of the following conditions is meet:
*
*
* - Its a {@link Character#isWhitespace(int)} whitespace.
* - Its a part of the Unicode Zs category ({@link Character#SPACE_SEPARATOR}).
*
*
* Character.isWhitespace(int) does not include no-break spaces.
* In OpenNLP no-break spaces are also considered as white spaces.
*
* @param charCode
* @return true if white space otherwise false
*/
public static boolean isWhitespace(int charCode) {
return Character.isWhitespace(charCode) ||
Character.getType(charCode) == Character.SPACE_SEPARATOR;
}
/**
* Converts to lower case independent of the current locale via
* {@link Character#toLowerCase(char)} which uses mapping information
* from the UnicodeData file.
*
* @param string
* @return lower cased String
*/
public static String toLowerCase(CharSequence string) {
char lowerCaseChars[] = new char[string.length()];
for (int i = 0; i < string.length(); i++) {
lowerCaseChars[i] = Character.toLowerCase(string.charAt(i));
}
return new String(lowerCaseChars);
}
/**
* Converts to upper case independent of the current locale via
* {@link Character#toUpperCase(char)} which uses mapping information
* from the UnicodeData file.
*
* @param string
* @return upper cased String
*/
public static String toUpperCase(CharSequence string) {
char upperCaseChars[] = new char[string.length()];
for (int i = 0; i < string.length(); i++) {
upperCaseChars[i] = Character.toUpperCase(string.charAt(i));
}
return new String(upperCaseChars);
}
/**
* Returns true if {@link CharSequence#length()} is
* 0 or null.
*
* @return true if {@link CharSequence#length()} is 0, otherwise
* false
*
* @since 1.5.1
*/
public static boolean isEmpty(CharSequence theString) {
return theString.length() == 0;
}
}