org.outerj.eclipse.jgit.util.RawCharUtil Maven / Gradle / Ivy
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/*
* Copyright (C) 2010, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.outerj.eclipse.jgit.util;
/**
* Utility class for character functions on raw bytes
*
* Characters are assumed to be 8-bit US-ASCII.
*/
public class RawCharUtil {
private static final boolean[] WHITESPACE = new boolean[256];
static {
WHITESPACE['\r'] = true;
WHITESPACE['\n'] = true;
WHITESPACE['\t'] = true;
WHITESPACE[' '] = true;
}
/**
* Determine if an 8-bit US-ASCII encoded character is represents whitespace
*
* @param c
* the 8-bit US-ASCII encoded character
* @return true if c represents a whitespace character in 8-bit US-ASCII
*/
public static boolean isWhitespace(final byte c) {
return WHITESPACE[c & 0xff];
}
/**
* Returns the new end point for the byte array passed in after trimming any
* trailing whitespace characters, as determined by the isWhitespace()
* function. start and end are assumed to be within the bounds of raw.
*
* @param raw
* the byte array containing the portion to trim whitespace for
* @param start
* the start of the section of bytes
* @param end
* the end of the section of bytes
* @return the new end point
*/
public static int trimTrailingWhitespace(final byte[] raw, final int start, final int end) {
int ptr = end - 1;
while (start <= ptr && isWhitespace(raw[ptr]))
ptr--;
return ptr + 1;
}
/**
* Returns the new start point for the byte array passed in after trimming
* any leading whitespace characters, as determined by the isWhitespace()
* function. start and end are assumed to be within the bounds of raw.
*
* @param raw
* the byte array containing the portion to trim whitespace for
* @param start
* the start of the section of bytes
* @param end
* the end of the section of bytes
* @return the new start point
*/
public static int trimLeadingWhitespace(final byte[] raw, int start, final int end) {
while (start < end && isWhitespace(raw[start]))
start++;
return start;
}
private RawCharUtil() {
// This will never be called
}
}