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## org.tmatesoft.svn.core.wc
Interface ISVNDiffGenerator

All Known Subinterfaces:
  ISVNGNUDiffGenerator

All Known Implementing Classes:
  DefaultSVNDiffGenerator

public interface ISVNDiffGenerator

The ISVNDiffGenerator should be implemented by drivers generating contents difference between files in order to be used in 'diff' operations performed by SVNDiffClient.

Since:
  1.2
Version:
  1.3
Author:
  TMate Software Ltd.
See Also:
  `SVNDiffClient`, `DefaultSVNDiffGenerator`

Method Summary
`File` | `createTempDirectory()` Creates a temporary directory (when necessary) where temporary files will be created.
`void` | `displayAddedDirectory(String path, String rev1, String rev2)` Notifies this generator that the directory was added in revision `rev2`.
`void` | `displayDeletedDirectory(String path, String rev1, String rev2)` Notifies this generator that the directory was deleted in revision `rev2`.
`void` | `displayFileDiff(String path, File file1, File file2, String rev1, String rev2, String mimeType1, String mimeType2, OutputStream result)` Generates and writes differences between two files to the specified output stream.
`void` | `displayPropDiff(String path, SVNProperties baseProps, SVNProperties diff, OutputStream result)` Writes the differences in file properties to the specified output stream.
`String` | `getEncoding()` Gets the encoding charset being in use for a diff output.
`byte[]` | `getEOL()` Returns the EOL marker bytes used in diff output.
`void` | `init(String anchorPath1, String anchorPath2)` Initializes the driver setting up the paths/URLs that should be compared, or root paths/URLs for those paths to which a diff operation should be restricted.
`boolean` | `isDiffAdded()` Tells whether added files are enabled to be diffed.
`boolean` | `isDiffCopied()` Tells whether copied files are enabled to be diffed against their copy sources.
`boolean` | `isDiffDeleted()` Tells whether deleted files are enabled to be diffed.
`boolean` | `isDiffUnversioned()` Says if unversioned files are also diffed or ignored.
`boolean` | `isForcedBinaryDiff()` Tells whether to force diff even if files are binary.
`void` | `setBasePath(File basePath)` Sets the root path for this diff generator.
`void` | `setDiffAdded(boolean isDiffAdded)` Enables or disables generating differences for added files.
`void` | `setDiffCopied(boolean isDiffCopied)` Enables or disables generating differences against copy source for copied files.
`void` | `setDiffDeleted(boolean isDiffDeleted)` Enables or disables generating differences for deleted files.
`void` | `setDiffUnversioned(boolean diffUnversioned)` Includes or not unversioned files into diff processing.
`void` | `setEncoding(String encoding)` Sets the encoding charset to be used for a diff output.
`void` | `setEOL(byte[] eol)` Sets the EOL marker bytes to use in diff output.
`void` | `setForcedBinaryDiff(boolean forced)` Enables or disables generating differnces between files having a binary MIME type.

Method Detail

### init

    public void init(String anchorPath1,
                     String anchorPath2)

  Initializes the driver setting up the paths/URLs that should be compared, or root paths/URLs for those paths to which a diff operation should be restricted.

  These paths have got the same meaning as OLD-TGT (`anchorPath1`) and NEW-TGT (`anchorPath2`) in the SVN command line client's 'svn diff' command. So, they can be either local paths, or URLs pointing to repository locations. If one of them (or both) is a URL it may differ from that one passed to an appropriate doDiff() method of SVNDiffClient in that case when in a peg revision it's one URL, but in the target revision it was changed (moved?) to some other one. So, this method should receive the real one.

  Parameters:
    `anchorPath1` - an old path/URL
    `anchorPath2` - a new path/URL

### setBasePath

    public void setBasePath(File basePath)

  Sets the root path for this diff generator.

  This can be used to make all paths in a diff output be relative to this base path.

  Parameters:
    `basePath` - a base path for this driver

### setForcedBinaryDiff

    public void setForcedBinaryDiff(boolean forced)

  Enables or disables generating differnces between files having a binary MIME type.

  Like the '--force' option of the 'svn diff' command.

  Parameters:
    `forced` - if true binary files will also be diffed, otherwise not

### setEncoding

    public void setEncoding(String encoding)

  Sets the encoding charset to be used for a diff output.

  Parameters:
    `encoding` - the name of a charset

### getEncoding

    public String getEncoding()

  Gets the encoding charset being in use for a diff output.

  Returns:
    the name of the charset being in use

### setEOL

    public void setEOL(byte[] eol)

  Sets the EOL marker bytes to use in diff output.

  Parameters:
    `eol` - EOL bytes
  Since:
    1.2.0

### getEOL

    public byte[] getEOL()

  Returns the EOL marker bytes used in diff output.

  Returns:
    EOL bytes
  Since:
    1.2.0

### setDiffDeleted

    public void setDiffDeleted(boolean isDiffDeleted)

  Enables or disables generating differences for deleted files.

  Like the '--no-diff-deleted' option of the 'svn diff' or 'svnlook diff' commands.

  Parameters:
    `isDiffDeleted` - if true then deleted files will be diffed, otherwise not
  See Also:
    `isDiffDeleted()`

### isDiffDeleted

    public boolean isDiffDeleted()

  Tells whether deleted files are enabled to be diffed.

  Returns:
    true if deleted files should be diffed (the driver is set to generate differences for deleted files as well), otherwise false
  See Also:
    `setDiffDeleted(boolean)`

### setDiffAdded

    public void setDiffAdded(boolean isDiffAdded)

  Enables or disables generating differences for added files. This switch is relevant to `SVNLookClient`'s diff operations.

  Like the '--no-diff-added' option of the 'svnlook diff' command.

  Parameters:
    `isDiffAdded` - if true then added files will be diffed, otherwise not
  See Also:
    `isDiffAdded()`

### isDiffAdded

    public boolean isDiffAdded()

  Tells whether added files are enabled to be diffed. This switch is relevant to `SVNLookClient`'s diff operations.

  Returns:
    true if added files should be diffed, otherwise false
  See Also:
    `setDiffAdded(boolean)`

### setDiffCopied

    public void setDiffCopied(boolean isDiffCopied)

  Enables or disables generating differences against copy source for copied files. This switch is relevant to `SVNLookClient`'s diff operations.

  Like the '--diff-copy-from' option of the 'svnlook diff' command.

  Parameters:
    `isDiffCopied` - if true then copied files will be diffed against copy sources, otherwise they will be treated as newly added files
  See Also:
    `isDiffCopied()`

### isDiffCopied

    public boolean isDiffCopied()

  Tells whether copied files are enabled to be diffed against their copy sources. This switch is relevant to `SVNLookClient`'s diff operations.

  Returns:
    true if copied files should be diffed against copy sources; false if copied files should be treated as newly added
  See Also:
    `setDiffCopied(boolean)`

### setDiffUnversioned

    public void setDiffUnversioned(boolean diffUnversioned)

  Includes or not unversioned files into diff processing.

  If a diff operation is invoked on a versioned directory and `diffUnversioned` is true then all unversioned files that may be met in the directory will be processed as added. Otherwise if `diffUnversioned` is false such files are ignored.

  Parameters:
    `diffUnversioned` - controls whether to diff unversioned files or not
  See Also:
    `isDiffUnversioned()`

### isDiffUnversioned

    public boolean isDiffUnversioned()

  Says if unversioned files are also diffed or ignored.

  Returns:
    true if diffed, false if ignored
  See Also:
    `setDiffUnversioned(boolean)`

### createTempDirectory

    public File createTempDirectory()
                             throws SVNException

  Creates a temporary directory (when necessary) where temporary files will be created.

  This temporary directory exists till the end of the diff operation.

  Returns:
    an abstract pathname denoting a newly-created temporary directory
  Throws:
    `SVNException` - if a directory can not be created

### displayPropDiff

    public void displayPropDiff(String path,
                                SVNProperties baseProps,
                                SVNProperties diff,
                                OutputStream result)
                         throws SVNException

  Writes the differences in file properties to the specified output stream.

  Parameters:
    `path` - a file path on which the property changes are written to the output
    `baseProps` - a `Map` of old properties (property names are mapped to their values)
    `diff` - a `Map` of changed properties (property names are mapped to their values)
    `result` - the target `OutputStream` where the differences will be written to
  Throws:
    `SVNException` - if can not save diff data

### displayFileDiff

    public void displayFileDiff(String path,
                                File file1,
                                File file2,
                                String rev1,
                                String rev2,
                                String mimeType1,
                                String mimeType2,
                                OutputStream result)
                         throws SVNException

  Generates and writes differences between two files to the specified output stream.

  `file1` or `file2` may be temporary files crteated to get file contents from the repository (when running diff on URLs). These temporary files will be deleted with the temporary directory (created by `createTempDirectory()`) when the operation ends up.

  Parameters:
    `path` - a file path on which the differences are generated and written to the output
    `file1` - a file with old contents
    `file2` - a file with new contents
    `rev1` - the first diff revision of `file1`
    `rev2` - the second diff revision of `file2`
    `mimeType1` - the MIME-type of `file1`
    `mimeType2` - the MIME-type of `file2`
    `result` - the target `OutputStream` where the differences will be written to
  Throws:
    `SVNException` - if can not save diff data

### displayDeletedDirectory

    public void displayDeletedDirectory(String path,
                                        String rev1,
                                        String rev2)
                                 throws SVNException

  Notifies this generator that the directory was deleted in revision `rev2`.

  Parameters:
    `path` - a directory path
    `rev1` - the first diff revision
    `rev2` - the second diff revision
  Throws:
    `SVNException`
  Since:
    1.1

### displayAddedDirectory

    public void displayAddedDirectory(String path,
                                      String rev1,
                                      String rev2)
                               throws SVNException

  Notifies this generator that the directory was added in revision `rev2`.

  Parameters:
    `path` - a directory path
    `rev1` - the first diff revision
    `rev2` - the second diff revision
  Throws:
    `SVNException`
  Since:
    1.1

### isForcedBinaryDiff

    public boolean isForcedBinaryDiff()

  Tells whether to force diff even if files are binary.

  Returns:
    true to force diff for binary files; otherwise false
  Since:
    1.1.1

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