| /* |
| * 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.drill.exec.store; |
| |
| //TODO - make sure we figure out the license on these |
| public class ByteArrayUtil { |
| |
| public static byte[] toByta(Object data) throws Exception { |
| if (data instanceof Integer) { |
| return toByta((int) data); |
| } else if (data instanceof Double) { |
| return toByta((double) data); |
| } else if (data instanceof Float) { |
| return toByta((float) data); |
| } else if (data instanceof Boolean) { |
| return toByta((boolean) data); |
| } else if (data instanceof Long) { |
| return toByta((long) data); |
| } else { |
| throw new Exception("Cannot convert that type to a byte array."); |
| } |
| } |
| |
| // found at http://www.daniweb.com/software-development/java/code/216874/primitive-types-as-byte-arrays |
| // I have modified them to switch the endianess of integers and longs |
| /* ========================= */ |
| /* "primitive type --> byte[] data" Methods */ |
| /* ========================= */ |
| public static byte[] toByta(byte data) { |
| return new byte[]{data}; |
| } |
| |
| public static byte[] toByta(byte[] data) { |
| return data; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(short data) { |
| return new byte[]{ |
| (byte) ((data >> 8) & 0xff), |
| (byte) ((data >> 0) & 0xff), |
| }; |
| } |
| |
| public static byte[] toByta(short[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 2]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 2, 2); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(char data) { |
| return new byte[]{ |
| (byte) ((data >> 8) & 0xff), |
| (byte) ((data >> 0) & 0xff), |
| }; |
| } |
| |
| public static byte[] toByta(char[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 2]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 2, 2); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(int data) { |
| return new byte[]{ |
| (byte) ((data >> 0) & 0xff), |
| (byte) ((data >> 8) & 0xff), |
| (byte) ((data >> 16) & 0xff), |
| (byte) ((data >> 24) & 0xff), |
| }; |
| } |
| |
| public static byte[] toByta(int[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 4]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 4, 4); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(long data) { |
| return new byte[]{ |
| (byte) ((data >> 0) & 0xff), |
| (byte) ((data >> 8) & 0xff), |
| (byte) ((data >> 16) & 0xff), |
| (byte) ((data >> 24) & 0xff), |
| (byte) ((data >> 32) & 0xff), |
| (byte) ((data >> 40) & 0xff), |
| (byte) ((data >> 48) & 0xff), |
| (byte) ((data >> 56) & 0xff), |
| }; |
| } |
| |
| public static byte[] toByta(long[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 8]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 8, 8); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(float data) { |
| return toByta(Float.floatToRawIntBits(data)); |
| } |
| |
| public static byte[] toByta(float[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 4]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 4, 4); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(double data) { |
| return toByta(Double.doubleToRawLongBits(data)); |
| } |
| |
| public static byte[] toByta(double[] data) { |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| byte[] byts = new byte[data.length * 8]; |
| for (int i = 0; i < data.length; i++) { |
| System.arraycopy(toByta(data[i]), 0, byts, i * 8, 8); |
| } |
| return byts; |
| } |
| |
| /* ========================= */ |
| public static byte[] toByta(boolean data) { |
| return new byte[]{(byte) (data ? 0x01 : 0x00)}; // bool -> {1 byte} |
| } |
| |
| public static byte[] toByta(boolean[] data) { |
| // Advanced Technique: The byte array containts information |
| // about how many boolean values are involved, so the exact |
| // array is returned when later decoded. |
| // ---------- |
| if (data == null) { |
| return null; |
| } |
| // ---------- |
| int len = data.length; |
| byte[] lena = toByta(len); // int conversion; length array = lena |
| byte[] byts = new byte[lena.length + (len / 8) + (len % 8 != 0 ? 1 : 0)]; |
| // (Above) length-array-length + sets-of-8-booleans +? byte-for-remainder |
| System.arraycopy(lena, 0, byts, 0, lena.length); |
| // ---------- |
| // (Below) algorithm by Matthew Cudmore: boolean[] -> bits -> byte[] |
| for (int i = 0, j = lena.length, k = 7; i < data.length; i++) { |
| byts[j] |= (data[i] ? 1 : 0) << k--; |
| if (k < 0) { |
| j++; |
| k = 7; |
| } |
| } |
| // ---------- |
| return byts; |
| } |
| |
| // above utility methods found here: |
| // http://www.daniweb.com/software-development/java/code/216874/primitive-types-as-byte-arrays |
| } |