| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.gora.accumulo.encoders; |
| |
| /** |
| * Encodes data in a ascii hex representation |
| */ |
| |
| public class HexEncoder implements Encoder { |
| |
| private byte chars[] = new byte[] {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; |
| |
| private void encode(byte[] a, long l) { |
| for (int i = a.length - 1; i >= 0; i--) { |
| a[i] = chars[(int) (l & 0x0f)]; |
| l = l >>> 4; |
| } |
| } |
| |
| private int fromChar(byte b) { |
| if (b >= '0' && b <= '9') { |
| return (b - '0'); |
| } else if (b >= 'a' && b <= 'f') { |
| return (b - 'a' + 10); |
| } |
| |
| throw new IllegalArgumentException("Bad char " + b); |
| } |
| |
| private long decode(byte[] a) { |
| long b = 0; |
| for (int i = 0; i < a.length; i++) { |
| b = b << 4; |
| b |= fromChar(a[i]); |
| } |
| |
| return b; |
| } |
| |
| @Override |
| public byte[] encodeByte(byte b, byte[] ret) { |
| encode(ret, 0xff & b); |
| return ret; |
| } |
| |
| @Override |
| public byte[] encodeByte(byte b) { |
| return encodeByte(b, new byte[2]); |
| } |
| |
| @Override |
| public byte decodeByte(byte[] a) { |
| return (byte) decode(a); |
| } |
| |
| @Override |
| public byte[] encodeShort(short s) { |
| return encodeShort(s, new byte[4]); |
| } |
| |
| @Override |
| public byte[] encodeShort(short s, byte[] ret) { |
| encode(ret, 0xffff & s); |
| return ret; |
| } |
| |
| @Override |
| public short decodeShort(byte[] a) { |
| return (short) decode(a); |
| } |
| |
| @Override |
| public byte[] encodeInt(int i) { |
| return encodeInt(i, new byte[8]); |
| } |
| |
| @Override |
| public byte[] encodeInt(int i, byte[] ret) { |
| encode(ret, i); |
| return ret; |
| } |
| |
| @Override |
| public int decodeInt(byte[] a) { |
| return (int) decode(a); |
| } |
| |
| @Override |
| public byte[] encodeLong(long l) { |
| return encodeLong(l, new byte[16]); |
| } |
| |
| @Override |
| public byte[] encodeLong(long l, byte[] ret) { |
| encode(ret, l); |
| return ret; |
| } |
| |
| @Override |
| public long decodeLong(byte[] a) { |
| return decode(a); |
| } |
| |
| @Override |
| public byte[] encodeDouble(double d) { |
| return encodeDouble(d, new byte[16]); |
| } |
| |
| @Override |
| public byte[] encodeDouble(double d, byte[] ret) { |
| return encodeLong(Double.doubleToRawLongBits(d), ret); |
| } |
| |
| @Override |
| public double decodeDouble(byte[] a) { |
| return Double.longBitsToDouble(decodeLong(a)); |
| } |
| |
| @Override |
| public byte[] encodeFloat(float d) { |
| return encodeFloat(d, new byte[16]); |
| } |
| |
| @Override |
| public byte[] encodeFloat(float d, byte[] ret) { |
| return encodeInt(Float.floatToRawIntBits(d), ret); |
| } |
| |
| @Override |
| public float decodeFloat(byte[] a) { |
| return Float.intBitsToFloat(decodeInt(a)); |
| } |
| |
| @Override |
| public boolean decodeBoolean(byte[] val) { |
| if (decodeByte(val) == 1) { |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public byte[] encodeBoolean(boolean b) { |
| return encodeBoolean(b, new byte[2]); |
| } |
| |
| @Override |
| public byte[] encodeBoolean(boolean b, byte[] ret) { |
| if (b) |
| encode(ret, 1); |
| else |
| encode(ret, 0); |
| |
| return ret; |
| } |
| |
| private byte[] toBinary(byte[] hex) { |
| byte[] bin = new byte[(hex.length / 2) + (hex.length % 2)]; |
| |
| int j = 0; |
| for (int i = 0; i < bin.length; i++) { |
| bin[i] = (byte) (fromChar(hex[j++]) << 4); |
| if (j >= hex.length) |
| break; |
| bin[i] |= (byte) fromChar(hex[j++]); |
| } |
| |
| return bin; |
| } |
| |
| private byte[] fromBinary(byte[] bin) { |
| byte[] hex = new byte[bin.length * 2]; |
| |
| int j = 0; |
| for (int i = 0; i < bin.length; i++) { |
| hex[j++] = chars[0x0f & (bin[i] >>> 4)]; |
| hex[j++] = chars[0x0f & bin[i]]; |
| } |
| |
| return hex; |
| } |
| |
| @Override |
| public byte[] followingKey(int size, byte[] per) { |
| return fromBinary(Utils.followingKey(size, toBinary(per))); |
| } |
| |
| @Override |
| public byte[] lastPossibleKey(int size, byte[] er) { |
| return fromBinary(Utils.lastPossibleKey(size, toBinary(er))); |
| } |
| |
| } |