Mega Code Archive
Removes one newline from end of a String if its there, otherwise leave it alone
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import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
/*
* 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.
*
*/
public class Main {
/**
* <code>\u000a</code> linefeed LF ('\n').
*
* @see <a href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#101089">JLF: Escape Sequences
* for Character and String Literals</a>
* @since 2.2
*/
public static final char LF = '\n';
/**
* <code>\u000d</code> carriage return CR ('\r').
*
* @see <a href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#101089">JLF: Escape Sequences
* for Character and String Literals</a>
* @since 2.2
*/
public static final char CR = '\r';
/**
* Removes one newline from end of a String if it's there,
* otherwise leave it alone. A newline is "<code>\n</code>",
* "<code>\r</code>", or "<code>\r\n</code>".
*
* NOTE: This method changed in 2.0.
* It now more closely matches Perl chomp.
*
* <pre>
* StringUtils.chomp(null) = null
* StringUtils.chomp("") = ""
* StringUtils.chomp("abc \r") = "abc "
* StringUtils.chomp("abc\n") = "abc"
* StringUtils.chomp("abc\r\n") = "abc"
* StringUtils.chomp("abc\r\n\r\n") = "abc\r\n"
* StringUtils.chomp("abc\n\r") = "abc\n"
* StringUtils.chomp("abc\n\rabc") = "abc\n\rabc"
* StringUtils.chomp("\r") = ""
* StringUtils.chomp("\n") = ""
* StringUtils.chomp("\r\n") = ""
* </pre>
*
* @param str the String to chomp a newline from, may be null
* @return String without newline, <code>null</code> if null String input
*/
public static String chomp(String str) {
if (isEmpty(str)) {
return str;
}
if (str.length() == 1) {
char ch = str.charAt(0);
if (ch == CR || ch == LF) {
return "";
}
return str;
}
int lastIdx = str.length() - 1;
char last = str.charAt(lastIdx);
if (last == LF) {
if (str.charAt(lastIdx - 1) == CR) {
lastIdx--;
}
} else if (last != CR) {
lastIdx++;
}
return str.substring(0, lastIdx);
}
// Empty checks
//-----------------------------------------------------------------------
/**
* Checks if a String is empty ("") or null.
*
* <pre>
* StringUtils.isEmpty(null) = true
* StringUtils.isEmpty("") = true
* StringUtils.isEmpty(" ") = false
* StringUtils.isEmpty("bob") = false
* StringUtils.isEmpty(" bob ") = false
* </pre>
*
* NOTE: This method changed in Lang version 2.0.
* It no longer trims the String.
* That functionality is available in isBlank().
*
* @param str the String to check, may be null
* @return <code>true</code> if the String is empty or null
*/
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
}
}
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