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

java.lang.Object
  org.tmatesoft.svn.core.io.diff.SVNDiffInstruction

public class SVNDiffInstruction
extends java.lang.Object

The SVNDiffInstruction class represents instructions used as delta applying rules.

For now there are three types of copy instructions:

• COPY_FROM_SOURCE: that is when bytes are copied from a source view (for example, existing revision of a file) to the target one.
• COPY_FROM_NEW_DATA: new data bytes (e.g. new text) are copied to the target view.
• COPY_FROM_TARGET: that is, when a sequence of bytes in the target must be repeated.

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

Since:

1.2

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

java.lang.String	toString() Gives a string representation of this object.
static void	writeInt(java.nio.ByteBuffer os, int i) Writes an integer to a byte buffer.
static void	writeLong(java.nio.ByteBuffer os, long i) Writes a long to a byte buffer.
void	writeTo(java.nio.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 java.lang.String toString()

Gives a string representation of this object.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this object

writeTo

public void writeTo(java.nio.ByteBuffer target)

Wirtes this instruction to a byte buffer.

Parameters:

target - a byte buffer to write to

writeInt

public static void writeInt(java.nio.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(java.nio.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