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////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010-2021 60East Technologies Inc., All Rights Reserved.
//
// This computer software is owned by 60East Technologies Inc. and is
// protected by U.S. copyright laws and other laws and by international
// treaties. This computer software is furnished by 60East Technologies
// Inc. pursuant to a written license agreement and may be used, copied,
// transmitted, and stored only in accordance with the terms of such
// license agreement and with the inclusion of the above copyright notice.
// This computer software or any other copies thereof may not be provided
// or otherwise made available to any other person.
//
// U.S. Government Restricted Rights. This computer software: (a) was
// developed at private expense and is in all respects the proprietary
// information of 60East Technologies Inc.; (b) was not developed with
// government funds; (c) is a trade secret of 60East Technologies Inc.
// for all purposes of the Freedom of Information Act; and (d) is a
// commercial item and thus, pursuant to Section 12.212 of the Federal
// Acquisition Regulations (FAR) and DFAR Supplement Section 227.7202,
// Government's use, duplication or disclosure of the computer software
// is subject to the restrictions set forth by 60East Technologies Inc..
//
////////////////////////////////////////////////////////////////////////////
package com.crankuptheamps.client.fields;
import java.nio.charset.StandardCharsets;
/**
* Base class for the different types of field data that make up a
* {@link com.crankuptheamps.client.Message}.
* Implemented with byte array and int offset and length primitives to maximize
* heap efficiency of cloning, reads, updates, and comparisons.
*/
public class Field
{
public byte[] buffer = null;
public int position = 0;
public int length = 0;
/**
* Default constructor.
*/
public Field()
{
}
/**
* Constructs an instance with the bytes of the specified string value. The string is interpreted as the
* UTF-8 representation.
* @param value The string to be converted into UTF-8 bytes.
*/
public Field(String value)
{
byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
this.buffer = bytes;
this.position = 0;
this.length = buffer.length;
}
/**
* Constructs an instance with the specified region of a byte buffer. Note: the bytes are not copied
* from the buffer. The specified buffer region is referenced by this instance.
* @param buffer The byte buffer.
* @param position The starting positon of the value in the byte buffer.
* @param length The length from the starting position of the value in the byte buffer.
*/
public Field(byte[] buffer, int position, int length)
{
set(buffer, position, length);
}
/**
* Sets the value of this instance with the specified region of a byte buffer. Note: the bytes are not
* copied from the buffer. The specified buffer region is referenced by this instance.
* @param buffer The byte buffer.
* @param position The starting positon of the value in the byte buffer.
* @param length The length from the starting position of the value in the byte buffer.
*/
public final void set(byte[] buffer,int position,int length)
{
this.buffer = buffer;
this.position = position;
this.length = length;
}
/**
* Sets the value of this instance with the specified buffer. Note: the bytes are not copied
* from the buffer. The buffer is referenced by this instance.
* @param buffer The byte buffer to be copied.
*/
public void set(byte[] buffer)
{
this.buffer = buffer;
this.position = 0;
this.length = buffer.length;
}
/**
* Indicates whether this instance's value is null.
* @return True if null, false if not.
*/
public boolean isNull()
{
return this.buffer == null || this.length == 0;
}
/**
* Resets the value of this instance to null.
*/
public void reset()
{
this.buffer = null;
this.length = 0;
}
/**
* Returns the byte at {@link #position} plus index i.
* @param i The given index.
* @return The specified byte.
*/
public byte byteAt(int i)
{
return this.buffer[this.position + i];
}
/**
* Default implementation of {@link Object#hashCode} for a Field.
*/
public int hashCode()
{
// for large sets of short, similar byte sequences this can produce lots of collision
int result = 0;
for(int i = 0; i < length; i++)
{
result += buffer[position+i];
}
return result;
}
/**
* Default implementation for {@link Object#equals} for a Field. For two Fields to be considered equal,
* their values must have the same length and all bytes in the value must be equal.
* @param obj The object to compare this with.
*/
public boolean equals(Object obj)
{
if(obj == null || !(obj instanceof Field))
{
return false;
}
Field o = (Field)obj;
if(o.length != length) return false;
for(int i=0; i< length; i++)
{
if(o.buffer[o.position+i] != buffer[position+i]) return false;
}
return true;
}
/**
* Constructs a new Field and sets its value to a deep copy of this instance.
* @return The new deep copy of this instance.
*/
public Field copy()
{
byte[] copy = null;
if (buffer != null) {
copy = new byte[length];
System.arraycopy(buffer, position, copy, 0, length);
}
return new Field(copy, 0, length);
}
/**
* Converts the value to a string representation where each byte is interpreted as a Java character.
* @return The Java string.
*/
public String toString()
{
StringBuilder sb = new StringBuilder();
for(int i = position; i < position + length; i++)
{
sb.append((char)buffer[i]);
}
return sb.toString();
}
/**
* Sets the value of this instance to a deep copy of the value of the specified field.
* @param f The Field to copy from.
*/
public void copyFrom(Field f) {
if (buffer == null || f.length > buffer.length) {
buffer = new byte[f.length];
}
System.arraycopy(f.buffer, f.position, buffer, 0, f.length);
position = 0;
length = f.length;
}
}
