MutableObjectId.java
/*
* Copyright (C) 2008-2009, Google Inc.
* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
* Copyright (C) 2007-2009, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006-2008, 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.lib;
import java.text.MessageFormat;
import org.eclipse.jgit.errors.InvalidObjectIdException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.util.NB;
import org.eclipse.jgit.util.RawParseUtils;
/**
* A mutable SHA-1 abstraction.
*/
public class MutableObjectId extends AnyObjectId {
/**
* Empty constructor. Initialize object with default (zeros) value.
*/
public MutableObjectId() {
super();
}
/**
* Copying constructor.
*
* @param src
* original entry, to copy id from
*/
MutableObjectId(MutableObjectId src) {
fromObjectId(src);
}
/**
* Set any byte in the id.
*
* @param index
* index of the byte to set in the raw form of the ObjectId. Must
* be in range [0,
* {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}).
* @param value
* the value of the specified byte at {@code index}. Values are
* unsigned and thus are in the range [0,255] rather than the
* signed byte range of [-128, 127].
* @throws java.lang.ArrayIndexOutOfBoundsException
* {@code index} is less than 0, equal to
* {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}, or
* greater than
* {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}.
*/
public void setByte(int index, int value) {
switch (index >> 2) {
case 0:
w1 = set(w1, index & 3, value);
break;
case 1:
w2 = set(w2, index & 3, value);
break;
case 2:
w3 = set(w3, index & 3, value);
break;
case 3:
w4 = set(w4, index & 3, value);
break;
case 4:
w5 = set(w5, index & 3, value);
break;
default:
throw new ArrayIndexOutOfBoundsException(index);
}
}
private static int set(int w, int index, int value) {
value &= 0xff;
switch (index) {
case 0:
return (w & 0x00ffffff) | (value << 24);
case 1:
return (w & 0xff00ffff) | (value << 16);
case 2:
return (w & 0xffff00ff) | (value << 8);
case 3:
return (w & 0xffffff00) | value;
default:
throw new ArrayIndexOutOfBoundsException();
}
}
/**
* Make this id match {@link org.eclipse.jgit.lib.ObjectId#zeroId()}.
*/
public void clear() {
w1 = 0;
w2 = 0;
w3 = 0;
w4 = 0;
w5 = 0;
}
/**
* Copy an ObjectId into this mutable buffer.
*
* @param src
* the source id to copy from.
*/
public void fromObjectId(AnyObjectId src) {
this.w1 = src.w1;
this.w2 = src.w2;
this.w3 = src.w3;
this.w4 = src.w4;
this.w5 = src.w5;
}
/**
* Convert an ObjectId from raw binary representation.
*
* @param bs
* the raw byte buffer to read from. At least 20 bytes must be
* available within this byte array.
*/
public void fromRaw(byte[] bs) {
fromRaw(bs, 0);
}
/**
* Convert an ObjectId from raw binary representation.
*
* @param bs
* the raw byte buffer to read from. At least 20 bytes after p
* must be available within this byte array.
* @param p
* position to read the first byte of data from.
*/
public void fromRaw(byte[] bs, int p) {
w1 = NB.decodeInt32(bs, p);
w2 = NB.decodeInt32(bs, p + 4);
w3 = NB.decodeInt32(bs, p + 8);
w4 = NB.decodeInt32(bs, p + 12);
w5 = NB.decodeInt32(bs, p + 16);
}
/**
* Convert an ObjectId from binary representation expressed in integers.
*
* @param ints
* the raw int buffer to read from. At least 5 integers must be
* available within this integers array.
*/
public void fromRaw(int[] ints) {
fromRaw(ints, 0);
}
/**
* Convert an ObjectId from binary representation expressed in integers.
*
* @param ints
* the raw int buffer to read from. At least 5 integers after p
* must be available within this integers array.
* @param p
* position to read the first integer of data from.
*/
public void fromRaw(int[] ints, int p) {
w1 = ints[p];
w2 = ints[p + 1];
w3 = ints[p + 2];
w4 = ints[p + 3];
w5 = ints[p + 4];
}
/**
* Convert an ObjectId from binary representation expressed in integers.
*
* @param a
* an int.
* @param b
* an int.
* @param c
* an int.
* @param d
* an int.
* @param e
* an int.
* @since 4.7
*/
public void set(int a, int b, int c, int d, int e) {
w1 = a;
w2 = b;
w3 = c;
w4 = d;
w5 = e;
}
/**
* Convert an ObjectId from hex characters (US-ASCII).
*
* @param buf
* the US-ASCII buffer to read from. At least 40 bytes after
* offset must be available within this byte array.
* @param offset
* position to read the first character from.
*/
public void fromString(byte[] buf, int offset) {
fromHexString(buf, offset);
}
/**
* Convert an ObjectId from hex characters.
*
* @param str
* the string to read from. Must be 40 characters long.
*/
public void fromString(String str) {
if (str.length() != Constants.OBJECT_ID_STRING_LENGTH)
throw new IllegalArgumentException(MessageFormat.format(
JGitText.get().invalidId, str));
fromHexString(Constants.encodeASCII(str), 0);
}
private void fromHexString(byte[] bs, int p) {
try {
w1 = RawParseUtils.parseHexInt32(bs, p);
w2 = RawParseUtils.parseHexInt32(bs, p + 8);
w3 = RawParseUtils.parseHexInt32(bs, p + 16);
w4 = RawParseUtils.parseHexInt32(bs, p + 24);
w5 = RawParseUtils.parseHexInt32(bs, p + 32);
} catch (ArrayIndexOutOfBoundsException e) {
InvalidObjectIdException e1 = new InvalidObjectIdException(bs, p,
Constants.OBJECT_ID_STRING_LENGTH);
e1.initCause(e);
throw e1;
}
}
/** {@inheritDoc} */
@Override
public ObjectId toObjectId() {
return new ObjectId(this);
}
}