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## org.tmatesoft.svn.core.io.diff
Class SVNDeltaProcessor

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

public class SVNDeltaProcessor
extends Object

The SVNDeltaProcessor is used to get a full text of a file in series applying diff windows being passed to a processor.

Since:
  1.2
Version:
  1.3
Author:
  TMate Software Ltd.

Constructor Summary
`SVNDeltaProcessor()` Creates a processor.

Method Summary
`void` `applyTextDelta(File baseFile, File targetFile, boolean computeCheksum)` Starts processing deltas given a base file and a one to write resultant target bytes to.
`void` `applyTextDelta(InputStream baseIS, File targetFile, boolean computeTargetCheksum)` Starts processing deltas given a base file and a one to write resultant target bytes to.
`void` `applyTextDelta(InputStream base, OutputStream target, boolean computeCheksum)` Starts processing deltas given a base file stream and an output stream to write resultant target bytes to.
`OutputStream` `textDeltaChunk(SVNDiffWindow window)` Receives a next diff window to be applied.
`String` `textDeltaEnd()` Performs delta processing finalizing steps.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SVNDeltaProcessor

    public SVNDeltaProcessor()

  Creates a processor.

Method Detail

### applyTextDelta

    public void applyTextDelta(InputStream base,
                               OutputStream target,
                               boolean computeCheksum)

  Starts processing deltas given a base file stream and an output stream to write resultant target bytes to.

  If a target full text is a newly added file (text deltas would be vs. empty), then source bytes are not needed and `base` may be passed as null.

  If `computeChecksum` is true, then an MD5 checksum will be calculated for target bytes. The calculated checksum is returned by `textDeltaEnd()`.

  Parameters:
    `base` - an input stream to take base file contents from
    `target` - an output stream to write the resultant target contents to
    `computeCheksum` - true to calculate checksum

### applyTextDelta

    public void applyTextDelta(File baseFile,
                               File targetFile,
                               boolean computeCheksum)
                        throws SVNException

  Starts processing deltas given a base file and a one to write resultant target bytes to.

  If a target full text is a newly added file (text deltas would be vs. empty), then source bytes are not needed and `baseFile` may be passed as null.

  If a file represented by `targetFile` does not exist yet, first tries to create an empty file.

  If `computeChecksum` is true, then an MD5 checksum will be calculated for target bytes. The calculated checksum is returned by `textDeltaEnd()`.

  Parameters:
    `baseFile` - a base file to read base file contents from
    `targetFile` - a destination file where resultant target bytes will be written
    `computeCheksum` - true to calculate checksum
  Throws:
    `SVNException`

### applyTextDelta

    public void applyTextDelta(InputStream baseIS,
                               File targetFile,
                               boolean computeTargetCheksum)
                        throws SVNException

  Starts processing deltas given a base file and a one to write resultant target bytes to.

  If a target full text is a newly added file (text deltas would be vs. empty), then source bytes are not needed and `baseIS` may be passed as null.

  If a file represented by `targetFile` does not exist yet, first tries to create an empty file.

  If `computeTargetChecksum` is true, then an MD5 checksum will be calculated for target bytes. The calculated checksum is returned by `textDeltaEnd()`.

  Parameters:
    `baseIS` - an input stream to take base file contents from
    `targetFile` - a destination file where resultant target bytes will be written
    `computeTargetCheksum` - true to calculate checksum of the target text
  Throws:
    `SVNException`
  Since:
    1.3

### textDeltaChunk

    public OutputStream textDeltaChunk(SVNDiffWindow window)
                                throws SVNException

  Receives a next diff window to be applied. The return value is a dummy stream (left for backward compatibility) since new data should come within a diff window.

  Parameters:
    `window` - a diff window
  Returns:
    a dummy output stream
  Throws:
    `SVNException`

### textDeltaEnd

    public String textDeltaEnd()

  Performs delta processing finalizing steps. Applies the last window left (if any) and finalizes checksum calculation (if a checksum was required).

  Returns:
    a string representing a hex form of the calculated MD5 checksum or null if checksum calculation was not required

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