1 /* 2 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> 3 * and other copyright owners as documented in the project's IP log. 4 * 5 * This program and the accompanying materials are made available 6 * under the terms of the Eclipse Distribution License v1.0 which 7 * accompanies this distribution, is reproduced below, and is 8 * available at http://www.eclipse.org/org/documents/edl-v10.php 9 * 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * - Neither the name of the Eclipse Foundation, Inc. nor the 25 * names of its contributors may be used to endorse or promote 26 * products derived from this software without specific prior 27 * written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 package org.eclipse.jgit.util; 45 46 /** 47 * A rough character sequence around a raw byte buffer. 48 * <p> 49 * Characters are assumed to be 8-bit US-ASCII. 50 */ 51 public final class RawCharSequence implements CharSequence { 52 /** A zero-length character sequence. */ 53 public static final RawCharSequencee.html#RawCharSequence">RawCharSequence EMPTY = new RawCharSequence(null, 0, 0); 54 55 final byte[] buffer; 56 57 final int startPtr; 58 59 final int endPtr; 60 61 /** 62 * Create a rough character sequence around the raw byte buffer. 63 * 64 * @param buf 65 * buffer to scan. 66 * @param start 67 * starting position for the sequence. 68 * @param end 69 * ending position for the sequence. 70 */ 71 public RawCharSequence(byte[] buf, int start, int end) { 72 buffer = buf; 73 startPtr = start; 74 endPtr = end; 75 } 76 77 /** {@inheritDoc} */ 78 @Override 79 public char charAt(int index) { 80 return (char) (buffer[startPtr + index] & 0xff); 81 } 82 83 /** {@inheritDoc} */ 84 @Override 85 public int length() { 86 return endPtr - startPtr; 87 } 88 89 /** {@inheritDoc} */ 90 @Override 91 public CharSequence subSequence(int start, int end) { 92 return new RawCharSequence(buffer, startPtr + start, startPtr + end); 93 } 94 95 /** {@inheritDoc} */ 96 @Override 97 public String toString() { 98 final int n = length(); 99 final StringBuilder b = new StringBuilder(n); 100 for (int i = 0; i < n; i++) 101 b.append(charAt(i)); 102 return b.toString(); 103 } 104 }