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org.tmatesoft.svn.core.io.diff
Class SVNDiffInstruction

java.lang.Object
  extended byorg.tmatesoft.svn.core.io.diff.SVNDiffInstruction

public class SVNDiffInstruction
extends Object

The SVNDiffInstruction class represents instructions used as delta applying rules.

For now there are three types of copy instructions:

These are three different ways how full text representation bytes are obtained.

Version:
1.1
Author:
TMate Software Ltd.

Field Summary
static int COPY_FROM_NEW_DATA
          A type of an instruction that says that data must be copied from the new data to the target view.
static int COPY_FROM_SOURCE
          A type of an instruction that says that data must be copied from the source view to the target one.
static int COPY_FROM_TARGET
          A type of an instruction that says that data must be copied from the target view to the target itself.
 int length
          A length bytes to copy.
 int offset
          An offset in the source from where the bytes should be copied.
 int type
          A type of this instruction.
 
Constructor Summary
SVNDiffInstruction()
          Creates a new instruction object.
SVNDiffInstruction(int t, int l, int o)
          Creates a particular type of a diff instruction.
 
Method Summary
 String toString()
          Gives a string representation of this object.
static void writeInt(ByteBuffer os, int i)
          Writes an integer to a byte buffer.
static void writeLong(ByteBuffer os, long i)
          Writes a long to a byte buffer.
 void writeTo(ByteBuffer target)
          Wirtes this instruction to a byte buffer.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

COPY_FROM_SOURCE

public static final int COPY_FROM_SOURCE
A type of an instruction that says that data must be copied from the source view to the target one.

See Also:
Constant Field Values

COPY_FROM_TARGET

public static final int COPY_FROM_TARGET
A type of an instruction that says that data must be copied from the target view to the target itself.

See Also:
Constant Field Values

COPY_FROM_NEW_DATA

public static final int COPY_FROM_NEW_DATA
A type of an instruction that says that data must be copied from the new data to the target view.

See Also:
Constant Field Values

type

public int type
A type of this instruction.


length

public int length
A length bytes to copy.


offset

public int offset
An offset in the source from where the bytes should be copied. Instruction offsets are relative to the bounds of views, i.e. a source/target view is a window of bytes (specified in a concrete diff window) in the source/target stream (this can be a file, a buffer).

Constructor Detail

SVNDiffInstruction

public SVNDiffInstruction(int t,
                          int l,
                          int o)
Creates a particular type of a diff instruction. Instruction offsets are relative to the bounds of views, i.e. a source/target view is a window of bytes (specified in a concrete diff window) in the source/target stream (this can be a file, a buffer).

Parameters:
t - a type of an instruction
l - a number of bytes to copy
o - an offset in the source (which may be a source or a target view, or a new data stream) from where the bytes are to be copied
See Also:
SVNDiffWindow

SVNDiffInstruction

public SVNDiffInstruction()
Creates a new instruction object. It's the instruction for the empty contents file.

Method Detail

toString

public String toString()
Gives a string representation of this object.

Returns:
a string representation of this object

writeTo

public void writeTo(ByteBuffer target)
Wirtes this instruction to a byte buffer.

Parameters:
target - a byte buffer to write to

writeInt

public static void writeInt(ByteBuffer os,
                            int i)
Writes an integer to a byte buffer.

Parameters:
os - a byte buffer to write to
i - an integer to write

writeLong

public static void writeLong(ByteBuffer os,
                             long i)
Writes a long to a byte buffer.

Parameters:
os - a byte buffer to write to
i - a long number to write

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