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/*
* 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;
}
@Override
public char charAt(int index) {
return (char) (buffer[startPtr + index] & 0xff);
}
@Override
public int length() {
return endPtr - startPtr;
}
@Override
public CharSequence subSequence(int start, int end) {
return new RawCharSequence(buffer, startPtr + start, startPtr + end);
}
@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();
}
}
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