| /* |
| * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.util; |
| |
| /** |
| * A rough character sequence around a raw byte buffer. |
| * <p> |
| * Characters are assumed to be 8-bit US-ASCII. |
| */ |
| public final class RawCharSequence implements CharSequence { |
| /** A zero-length character sequence. */ |
| public static final RawCharSequence EMPTY = new RawCharSequence(null, 0, 0); |
| |
| final byte[] buffer; |
| |
| final int startPtr; |
| |
| final int endPtr; |
| |
| /** |
| * Create a rough character sequence around the raw byte buffer. |
| * |
| * @param buf |
| * buffer to scan. |
| * @param start |
| * starting position for the sequence. |
| * @param end |
| * ending position for the sequence. |
| */ |
| public RawCharSequence(byte[] buf, int start, int end) { |
| buffer = buf; |
| startPtr = start; |
| endPtr = end; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public char charAt(int index) { |
| return (char) (buffer[startPtr + index] & 0xff); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int length() { |
| return endPtr - startPtr; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| return new RawCharSequence(buffer, startPtr + start, startPtr + end); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String toString() { |
| final int n = length(); |
| final StringBuilder b = new StringBuilder(n); |
| for (int i = 0; i < n; i++) |
| b.append(charAt(i)); |
| return b.toString(); |
| } |
| } |