bytearray.cs

C#数据库中间层处理,支持主流数据库,如sql、oracle等

/*
 * ByteArray.cs
 *
 * Copyright (c) 2001, The HSQL Development Group
 * 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 HSQL Development Group 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 REGENTS 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.
 *
 * This package is based on HypersonicSQL, originally developed by Thomas Mueller.
 *
 * C# port by Mark Tutt
 *
 */
namespace SharpHSQL
{
	using System;
	using System.Collections;
	using System.IO;
	using System.Runtime.Serialization.Formatters.Binary;

	/**
	 * ByteArray class declaration
	 * <P> This class allows HSQL to store binary data as an array of bytes.
	 * It contains methods to create and access the data, perform comparisons, etc.
	 *
	 * @version 1.0.0.1
	 */
	class ByteArray 
	{
		private byte[] data;

		/**
		 * ByteArray Constructor declaration
		 * <P>Converts a string parameter to the array of bytes the ByteArray object
		 * will contain.
		 *
		 * @param s
		 */
		public ByteArray(string s) 
		{
			data = stringConverter.hexToByte(s);
		}

		/**
		 * ByteArray Constructor declaration
		 * <P>Creates a ByteArray object from an array of bytes.
		 *
		 * @param s
		 */
		public ByteArray(byte []a) 
		{
			data = a;
		}

		/**
		 * byteValue method declaration
		 * <P>Give access to the object's data
		 *
		 * @return The array of bytes representing this objects data.
		 */
		public byte[] byteValue() 
		{
			return data;
		}

		/**
		 * compareTo method declaration
		 * <P>This method compares the object to another ByteArray object.
		 *
		 * @param ByteArray object we are comparing against.
		 *
		 * @return 0 if objects are the same, non-zero otherwise.
		 */
		public int compareTo(ByteArray o) 
		{
			int len = data.Length;
			int lenb = o.data.Length;

			for (int i = 0; ; i++) 
			{
				int a = 0, b = 0;

				if (i < len) 
				{
					a = ((int) data[i]) & 0xff;
				} 
				else if (i >= lenb) 
				{
					return 0;
				}

				if (i < lenb) 
				{
					b = ((int) o.data[i]) & 0xff;
				}

				if (a > b) 
				{
					return 1;
				}

				if (b > a) 
				{
					return -1;
				}
			}
		}

		/**
		 * serialize method declaration
		 * <P>This method serializes an object into an array of bytes.
		 *
		 * @param The object to serialize
		 *
		 * @return a static byte array representing the passed object
		 *
		 * @throws Exception
		 */
		public static byte[] serialize(object s) 
		{
			try 
			{
				MemoryStream ms = new MemoryStream();
				BinaryFormatter b = new BinaryFormatter();
				b.Serialize(ms,s);

				return ms.ToArray();
			} 
			catch (Exception e) 
			{
				throw Trace.error(Trace.SERIALIZATION_FAILURE, e.Message);
			}
		}

		/**
		 * serializeTostring method declaration
		 * <P>This method serializes an object into a string.
		 *
		 * @param The object to serialize
		 *
		 * @return A string representing the passed object
		 *
		 * @throws Exception
		 */
		public static string serializeTostring(object s) 
		{
			return createstring(serialize(s));
		}

		/**
		 * deserialize method declaration
		 * <P>This method returns the array of bytes stored in the instance of
		 * ByteArray class as an object instance.
		 *
		 * @return deserialized object
		 *
		 * @throws Exception
		 */
		public object deserialize() 
		{
			try 
			{
				MemoryStream ms = new MemoryStream(data);
				BinaryFormatter b = new BinaryFormatter();

				return b.Deserialize(ms);
			} 
			catch (Exception e) 
			{
				throw Trace.error(Trace.SERIALIZATION_FAILURE, e.Message);
			}
		}

		/**
		 * createstring method declaration
		 * <P>This method creates a string from the passed array of bytes.
		 *
		 * @param byte array to convert.
		 *
		 * @return string representation of the byte array.
		 */
		static string createstring(byte[] b) 
		{
			return b.ToString();
		}

		/**
		 * tostring method declaration
		 * <P>This method creates a string from the passed array of bytes stored in
		 * this instance of the ByteArray class.
		 *
		 * @return string representation of the ByteArray.
		 */
		public string tostring() 
		{
			return createstring(data);
		}

		/**
		 * hashcode method declaration
		 * <P>This method returns the hashcode for the data stored in this instance of
		 * the ByteArray class.
		 *
		 * @return
		 */
		public int hashCode() 
		{
			return data.GetHashCode();
		}

	}
}