Java tutorial
/* * ConversionUtil.java * * Created on May 28, 2006, 12:02 PM * * Copyright (c) 2006, Mark Martin All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the * following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and * the following disclaimer in the documentation and/or other materials provided with the distribution. * * Neither the name of the JOCP Project nor the names of its contributors may be used to endorse or * promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.nio.ByteBuffer; /** * * @author mark */ public class ConversionUtil { /** Creates a new instance of ConversionUtil */ public ConversionUtil() { } public static byte[] convertToByteArray(byte value) { byte[] array = new byte[1]; array[0] = value; return array; } public static byte[] convertToByteArray(char value) { byte[] bytes = new byte[2]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putChar(value); return buffer.array(); // buffer.get(bytes); /* for (int i =0;i<bytes.length; ++i) { int offset = (bytes.length -i-1) *8; bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } **/ // return bytes; } public static byte[] convertToByteArray(int value) { byte[] bytes = new byte[4]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putInt(value); return buffer.array(); // buffer.get(bytes); /* for (int i =0;i<bytes.length; ++i) { int offset = (bytes.length -i-1) *8; bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } */ // return bytes; } public static byte[] convertToByteArray(long value) { byte[] bytes = new byte[8]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putLong(value); return buffer.array(); // buffer.get(bytes); /* for (int i =0;i<bytes.length; ++i) { int offset = (bytes.length -i-1) *8; bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } */ // return bytes; } public static byte[] convertToByteArray(short value) { byte[] bytes = new byte[2]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putShort(value); return buffer.array(); // buffer.get(bytes); /* for (int i =0;i<bytes.length; ++i) { int offset = (bytes.length -i-1) *8; bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } */ // return bytes; } public static byte[] convertToByteArray(float value) { byte[] bytes = new byte[4]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putFloat(value); return buffer.array(); // buffer.get(bytes); // return bytes; // return convertToByteArray(Float.floatToIntBits(value)); } public static byte[] convertToByteArray(double value) { byte[] bytes = new byte[8]; ByteBuffer buffer = ByteBuffer.allocate(bytes.length); buffer.putDouble(value); return buffer.array(); // buffer.get(bytes); // return bytes; //return convertToByteArray(Double.doubleToLongBits(value)); } public static byte[] convertToByteArray(String value) { return value.getBytes(); } public static byte[] convertToByteArray(boolean value) { byte[] array = new byte[1]; array[0] = (byte) (value == true ? 1 : 0); return array; } public static byte convertToByte(byte[] array) { return array[0]; } public static int convertToInt(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getInt(); /* int value = 0; for (int i =0;i<array.length; ++i) { int offset = (array.length -i-1) *8; value += (array[i] << offset); // bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } return value; **/ } public static long convertToLong(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getLong(); /* long value = 0; for (int i =0;i<array.length; ++i) { int offset = (array.length -i-1) *8; value += (array[i] << offset); // bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } return value; */ } public static short convertToShort(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getShort(); /* short value = 0; for (int i =0;i<array.length; ++i) { int offset = (array.length -i-1) *8; value += (array[i] << offset); // bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } return value; */ } public static String convertToString(byte[] array) { String value = new String(array); return value; } public static Object convertToValue(Class aClass, byte[] inputArray) throws Exception { Object returnValue = null; String className = aClass.getName(); if (className.equals(Integer.class.getName())) { returnValue = new Integer(convertToInt(inputArray)); } else if (className.equals(String.class.getName())) { returnValue = convertToString(inputArray); } else if (className.equals(Byte.class.getName())) { returnValue = new Byte(convertToByte(inputArray)); } else if (className.equals(Long.class.getName())) { returnValue = new Long(convertToLong(inputArray)); } else if (className.equals(Short.class.getName())) { returnValue = new Short(convertToShort(inputArray)); } else if (className.equals(Boolean.class.getName())) { returnValue = new Boolean(convertToBoolean(inputArray)); } else { throw new Exception("Cannot convert object of type " + className); } return returnValue; } public static byte[] convertToByteArray(Object object) throws Exception { byte[] returnArray = null; Class clazz = object.getClass(); String clazzName = clazz.getName(); if (clazz.equals(Integer.class)) { Integer aValue = (Integer) object; int intValue = aValue.intValue(); returnArray = convertToByteArray(intValue); } else if (clazz.equals(String.class)) { String aValue = (String) object; returnArray = convertToByteArray(aValue); } else if (clazz.equals(Byte.class)) { Byte aValue = (Byte) object; byte byteValue = aValue.byteValue(); returnArray = convertToByteArray(byteValue); } else if (clazz.equals(Long.class)) { Long aValue = (Long) object; long longValue = aValue.longValue(); returnArray = convertToByteArray(longValue); } else if (clazz.equals(Short.class)) { Short aValue = (Short) object; short shortValue = aValue.shortValue(); returnArray = convertToByteArray(shortValue); } else if (clazz.equals(Boolean.class)) { Boolean aValue = (Boolean) object; boolean booleanValue = aValue.booleanValue(); returnArray = convertToByteArray(booleanValue); } else if (clazz.equals(Character.class)) { Character aValue = (Character) object; char charValue = aValue.charValue(); returnArray = convertToByteArray(charValue); } else if (clazz.equals(Float.class)) { Float aValue = (Float) object; float floatValue = aValue.floatValue(); returnArray = convertToByteArray(floatValue); } else if (clazz.equals(Double.class)) { Double aValue = (Double) object; double doubleValue = aValue.doubleValue(); returnArray = convertToByteArray(doubleValue); } else { throw new Exception("Cannot convert object of type " + clazzName); } return returnArray; } public static boolean convertToBoolean(byte[] array) { return (array[0] > 0 ? true : false); } public static char convertToCharacter(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getChar(); /* char value = 0; for (int i =0;i<array.length; ++i) { int offset = (array.length -i-1) *8; value += (array[i] << offset); // bytes[i] = (byte)((value & (0xff << offset)) >>> offset); } return value; */ } public static double convertToDouble(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getDouble(); /* long longValue = convertToLong(array); return Double.longBitsToDouble(longValue); */ } public static float convertToFloat(byte[] array) { ByteBuffer buffer = ByteBuffer.wrap(array); return buffer.getFloat(); /* int intValue = convertToInt(array); return Float.intBitsToFloat(intValue); */ } }