serval-dna/java/org/servalproject/servaldna/AbstractId.java

135 lines
3.9 KiB
Java

/**
* Copyright (C) 2011 The Serval Project
*
* This file is part of Serval Software (http://www.servalproject.org)
*
* Serval Software is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This source code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this source code; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.servalproject.servaldna;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
public abstract class AbstractId {
abstract int getBinarySize();
public static class InvalidHexException extends Exception {
private static final long serialVersionUID = 1L;
private InvalidHexException(AbstractId id, String message) {
super(id.getClass().getName() + ": " + message);
}
}
public static class InvalidBinaryException extends Exception {
private static final long serialVersionUID = 1L;
private InvalidBinaryException(AbstractId id, String message) {
super(id.getClass().getName() + ": " + message);
}
}
private final byte[] binary;
public AbstractId(String hex) throws InvalidHexException {
if (hex==null)
throw new InvalidHexException(this, "null is not a invalid hex value");
if (hex.length() != getBinarySize()*2)
throw new InvalidHexException(this, "invalid length " + hex.length() + " (should be " + (getBinarySize() * 2) + ") of '" + hex + "'");
binary = new byte[getBinarySize()];
int j = 0;
for (int i = 0; i != binary.length; i++) {
int d1 = Character.digit(hex.charAt(j++), 16);
int d2 = Character.digit(hex.charAt(j++), 16);
if (d1 == -1 || d2 == -1)
throw new InvalidHexException(this, "non-hex digit in '" + hex + "'");
binary[i] = (byte) ((d1 << 4) | d2);
}
}
public AbstractId(ByteBuffer b) throws InvalidBinaryException {
this.binary = new byte[getBinarySize()];
try {
b.get(this.binary);
}
catch (BufferUnderflowException e) {
throw new InvalidBinaryException(this, "not enough bytes (expecting " + getBinarySize() + ")");
}
}
public AbstractId(byte[] binary) throws InvalidBinaryException {
if (binary.length != getBinarySize())
throw new InvalidBinaryException(this, "invalid number of bytes (" + binary.length + "), should be " + getBinarySize());
this.binary = binary;
}
@Override
public boolean equals(Object other) {
// must be the exact same type with the same binary contents to be considered equal
if (other==null)
return false;
if (other.getClass() == this.getClass()) {
AbstractId oBinary = (AbstractId) other;
for (int i = 0; i < this.binary.length; i++)
if (this.binary[i] != oBinary.binary[i])
return false;
return true;
}
return false;
}
@Override
public int hashCode() {
int hashCode = 0;
for (int i = 0; i < this.binary.length; i++)
hashCode = (hashCode << 8 | hashCode >>> 24) ^ this.binary[i];
return hashCode;
}
public void toByteBuffer(ByteBuffer buff){
buff.put(this.binary);
}
public String toHex(int offset, int len) {
StringBuilder sb = new StringBuilder();
for (int i = offset; i < offset + len && i < binary.length; i++) {
sb.append(Character.forDigit(((binary[i]) & 0xf0) >> 4, 16));
sb.append(Character.forDigit((binary[i]) & 0x0f, 16));
}
return sb.toString().toUpperCase();
}
public String toHex(int len) {
return toHex(0, len);
}
public String toHex() {
return toHex(0, binary.length);
}
public String abbreviation() {
return toHex(0, 4);
}
@Override
public String toString() {
return toHex();
}
}