Package org.tmatesoft.svn.core.io.diff

Class SVNDiffInstruction

java.lang.Object
org.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:

  • 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
Version:
1.3
Author:
TMate Software Ltd.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    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.
    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.
    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.
    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

    Constructors
    Constructor
    Description
    SVNDiffInstruction()
    Creates a new instruction object.
    SVNDiffInstruction(int t, int l, int o)
    Creates a particular type of a diff instruction.

  • Method Summary

    Modifier and Type
    Method
    Description
    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 Details

    • 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:

    • 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:

    • 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:

    • 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 Details

    • 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:

    • SVNDiffInstruction

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

  • Method Details

    • toString

      public String toString()
      Gives a string representation of this object.
      Overrides:
      toString in class 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