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## org.tmatesoft.svn.core.wc.admin
Class SVNLookClient

    java.lang.Object
      org.tmatesoft.svn.core.wc.SVNBasicClient
          org.tmatesoft.svn.core.wc.admin.SVNLookClient

All Implemented Interfaces:
  ISVNCanceller, ISVNEventHandler

public class SVNLookClient
extends SVNBasicClient

The SVNLookClient class provides API for examining different aspects of a Subversion repository. Its functionality is similar to the one of the Subversion command-line utility called svnlook. The following table matches methods of SVNLookClient to the corresponding commands of the svnlook utility (to make sense what its different methods are for):

SVNLookClient | Subversion
doCat() | 'svnlook cat'
doGetAuthor() | 'svnlook author'
doGetChanged() | 'svnlook changed'
doGetChangedDirectories() | 'svnlook dirs-changed'
doGetDate() | 'svnlook date'
doGetDiff() | 'svnlook diff'
doGetHistory() | 'svnlook history'
doGetInfo() | 'svnlook info'
doGetLock() | 'svnlook lock'
doGetLog() | 'svnlook log'
doGetProperties() | 'svnlook proplist'
doGetProperty() | 'svnlook propget'
doGetRevisionProperties() | 'svnlook proplist --revprop'
doGetRevisionProperty() | 'svnlook propget --revprop'
doGetTree() | 'svnlook tree'
doGetUUID() | 'svnlook uuid'
doGetYoungestRevision() | 'svnlook youngest'

Since:
  1.1.1
Version:
  1.1.1
Author:
  TMate Software Ltd.

Nested Class Summary

Nested classes inherited from class org.tmatesoft.svn.core.wc.SVNBasicClient
`SVNBasicClient.RepositoryReference, SVNBasicClient.SVNRepositoryLocation`

Field Summary

Fields inherited from interface org.tmatesoft.svn.core.wc.ISVNEventHandler
`UNKNOWN`

Fields inherited from interface org.tmatesoft.svn.core.ISVNCanceller
`NULL`

Constructor Summary
`SVNLookClient(ISVNAuthenticationManager authManager, ISVNOptions options)` Creates a new instance of SVNLookClient given an authentication manager and global options keeper.
`SVNLookClient(ISVNRepositoryPool repositoryPool, ISVNOptions options)` Creates a new instance of SVNLookClient given an `SVNRepository`} drivers provider and global options keeper.

Method Summary
`void` `doCat(File repositoryRoot, String path, String transactionName, OutputStream out)` Fetches file contents for the specified path in the given transaction.
`void` `doCat(File repositoryRoot, String path, SVNRevision revision, OutputStream out)` Fetches file contents for the specified revision and path.
`String` `doGetAuthor(File repositoryRoot, String transactionName)` Returns author information for the given transaction.
`String` `doGetAuthor(File repositoryRoot, SVNRevision revision)` Returns author information for the given revision.
`void` `doGetChanged(File repositoryRoot, String transactionName, ISVNChangeEntryHandler handler, boolean includeCopyInfo)` Traverses changed paths for the given transaction invoking the passed handler on each changed path.
`void` `doGetChanged(File repositoryRoot, SVNRevision revision, ISVNChangeEntryHandler handler, boolean includeCopyInfo)` Traverses changed paths for the given revision invoking the passed handler on each changed path.
`void` `doGetChangedDirectories(File repositoryRoot, String transactionName, ISVNChangedDirectoriesHandler handler)` Passes paths of directories changed in the given transaction to the provided handler.
`void` `doGetChangedDirectories(File repositoryRoot, SVNRevision revision, ISVNChangedDirectoriesHandler handler)` Passes paths of directories changed in the given revision to the provided handler.
`Date` `doGetDate(File repositoryRoot, String transactionName)` Returns datestamp information for the given transaction.
`Date` `doGetDate(File repositoryRoot, SVNRevision revision)` Returns datestamp information for the given revision.
`void` `doGetDiff(File repositoryRoot, String transactionName, boolean diffDeleted, boolean diffAdded, boolean diffCopyFrom, OutputStream os)` Writes differences of changed files and properties for the given transaction to the provided output stream.
`void` `doGetDiff(File repositoryRoot, SVNRevision revision, boolean diffDeleted, boolean diffAdded, boolean diffCopyFrom, OutputStream os)` Writes differences of changed files and properties for the given revision to the provided output stream.
`void` `doGetHistory(File repositoryRoot, String path, SVNRevision revision, boolean includeIDs, ISVNHistoryHandler handler)` Passes history information for the specified path and revision to the provided handler.
`SVNLogEntry` `doGetInfo(File repositoryRoot, String transactionName)` Retrieves author, timestamp and log message information from the repository for the given transaction name.
`SVNLogEntry` `doGetInfo(File repositoryRoot, SVNRevision revision)` Retrieves author, timestamp and log message information from the repository for the given revision.
`SVNLock` `doGetLock(File repositoryRoot, String path)` Retrieves lock information for the specified path.
`String` `doGetLog(File repositoryRoot, String transactionName)` Returns log information for the given transaction.
`String` `doGetLog(File repositoryRoot, SVNRevision revision)` Returns log information for the given revision.
`Map` `doGetProperties(File repositoryRoot, String path, String transactionName)` Returns versioned properties for the specified path in the given transaction.
`Map` `doGetProperties(File repositoryRoot, String path, SVNRevision revision)` Returns versioned properties for the specified path in the given revision.
`String` `doGetProperty(File repositoryRoot, String propName, String path, String transactionName)` Returns the value of a versioned property for the specified path in the given transaction.
`String` `doGetProperty(File repositoryRoot, String propName, String path, SVNRevision revision)` Returns the value of a versioned property for the specified path in the given revision.
`Map` `doGetRevisionProperties(File repositoryRoot, String transactionName)` Returns revision properties for the given transaction.
`Map` `doGetRevisionProperties(File repositoryRoot, SVNRevision revision)` Returns revision properties in the given revision.
`String` `doGetRevisionProperty(File repositoryRoot, String propName, String transactionName)` Returns the value of a revision property for the given transaction.
`String` `doGetRevisionProperty(File repositoryRoot, String propName, SVNRevision revision)` Returns the value of a revision property in the given revision.
`void` `doGetTree(File repositoryRoot, String path, String transactionName, boolean includeIDs, ISVNTreeHandler handler)` Traverses repository tree starting at the specified path in the given transaction and invoking the provided handler on each path.
`void` `doGetTree(File repositoryRoot, String path, SVNRevision revision, boolean includeIDs, ISVNTreeHandler handler)` Traverses repository tree starting at the specified path in the given revision and invoking the provided handler on each path.
`String` `doGetUUID(File repositoryRoot)` Returns the uuid of the repository.
`long` `doGetYoungestRevision(File repositoryRoot)` Returns the latest revision of the repository.
`ISVNGNUDiffGenerator` `getDiffGenerator()` Returns a diff generator to be used in `doGetDiff()` methods of this class.
`void` `setDiffGenerator(ISVNGNUDiffGenerator diffGenerator)` Sets a diff generator to be used in `doGetDiff()` methods of this class.

Methods inherited from class org.tmatesoft.svn.core.wc.SVNBasicClient

`checkCancelled, createRepository, createRepository, createRepository, createWCAccess, createWCAccess, dispatchEvent, dispatchEvent, getDebugLog, getEventDispatcher, getLocations, getOptions, getRepositoryPool, getRevisionNumber, getURL, handleEvent, isIgnoreExternals, isLeaveConflictsUnresolved, setDebugLog, setEventHandler, setEventPathPrefix, setIgnoreExternals, setLeaveConflictsUnresolved, setOptions, sleepForTimeStamp`

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

Constructor Detail

### SVNLookClient

    public SVNLookClient(ISVNAuthenticationManager authManager,
                         ISVNOptions options)

  Creates a new instance of SVNLookClient given an authentication manager and global options keeper.

Parameters:
  `authManager` - a manager which provides authentication credentials
  `options` - a global config options provider

### SVNLookClient

    public SVNLookClient(ISVNRepositoryPool repositoryPool,
                         ISVNOptions options)

  Creates a new instance of SVNLookClient given an `SVNRepository`} drivers provider and global options keeper.

Parameters:
  `repositoryPool` - a repository connectors keeper
  `options` - a global config options provider

Method Detail

### doGetInfo

    public SVNLogEntry doGetInfo(File repositoryRoot,
                                 SVNRevision revision)
                          throws SVNException

  Retrieves author, timestamp and log message information from the repository for the given revision. This information is provided in a single `SVNLogEntry` object, that is only the following methods of SVNLogEntry return valid information:
  - `getAuthor()`
  - `getDate()`
  - `getMessage()`
  - `getRevision()`

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
  Returns:
    revision info
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetInfo

    public SVNLogEntry doGetInfo(File repositoryRoot,
                                 String transactionName)
                          throws SVNException

  Retrieves author, timestamp and log message information from the repository for the given transaction name. This information is provided in a single `SVNLogEntry` object, that is only the following methods of SVNLogEntry return valid information:
  - `getAuthor()`
  - `getDate()`
  - `getMessage()`

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
  Returns:
    transaction info
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetYoungestRevision

    public long doGetYoungestRevision(File repositoryRoot)
                               throws SVNException

  Returns the latest revision of the repository.

  Parameters:
    `repositoryRoot` - a repository root directory path
  Returns:
    a revision number
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetUUID

    public String doGetUUID(File repositoryRoot)
                     throws SVNException

  Returns the uuid of the repository.

  Parameters:
    `repositoryRoot` - a repository root directory path
  Returns:
    an uuid
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetAuthor

    public String doGetAuthor(File repositoryRoot,
                              SVNRevision revision)
                       throws SVNException

  Returns author information for the given revision.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
  Returns:
    a revision author
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetAuthor

    public String doGetAuthor(File repositoryRoot,
                              String transactionName)
                       throws SVNException

  Returns author information for the given transaction.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
  Returns:
    a transaction owner
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doCat

    public void doCat(File repositoryRoot,
                      String path,
                      SVNRevision revision,
                      OutputStream out)
               throws SVNException

  Fetches file contents for the specified revision and path. `path` must be absolute, that is it must start with `'/'`. The provided output stream is not closed within this method.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute file path
    `revision` - a revision number
    `out` - an output stream to write contents to
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found or is not a file

### doCat

    public void doCat(File repositoryRoot,
                      String path,
                      String transactionName,
                      OutputStream out)
               throws SVNException

  Fetches file contents for the specified path in the given transaction. `path` must be absolute, that is it must start with `'/'`. The provided output stream is not closed within this method.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute file path
    `transactionName` - a transaction name
    `out` - an output stream to write contents to
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found or is not a file
    - if the specified transaction is not found

### doGetDate

    public Date doGetDate(File repositoryRoot,
                          SVNRevision revision)
                   throws SVNException

  Returns datestamp information for the given revision.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
  Returns:
    a datestamp
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetDate

    public Date doGetDate(File repositoryRoot,
                          String transactionName)
                   throws SVNException

  Returns datestamp information for the given transaction.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
  Returns:
    a datestamp
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetLog

    public String doGetLog(File repositoryRoot,
                           SVNRevision revision)
                    throws SVNException

  Returns log information for the given revision.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
  Returns:
    a log message
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetLog

    public String doGetLog(File repositoryRoot,
                           String transactionName)
                    throws SVNException

  Returns log information for the given transaction.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
  Returns:
    a log message
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetChanged

    public void doGetChanged(File repositoryRoot,
                             SVNRevision revision,
                             ISVNChangeEntryHandler handler,
                             boolean includeCopyInfo)
                      throws SVNException

  Traverses changed paths for the given revision invoking the passed handler on each changed path.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
    `handler` - a changed path handler
    `includeCopyInfo` - if true copy-from information is also provided for copied paths
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetChanged

    public void doGetChanged(File repositoryRoot,
                             String transactionName,
                             ISVNChangeEntryHandler handler,
                             boolean includeCopyInfo)
                      throws SVNException

  Traverses changed paths for the given transaction invoking the passed handler on each changed path.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
    `handler` - a changed path handler
    `includeCopyInfo` - if true copy-from information is also provided for copied paths
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetChangedDirectories

    public void doGetChangedDirectories(File repositoryRoot,
                                        SVNRevision revision,
                                        ISVNChangedDirectoriesHandler handler)
                                 throws SVNException

  Passes paths of directories changed in the given revision to the provided handler. Paths are absolute (start with `'/'`).

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
    `handler` - a path handler
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetChangedDirectories

    public void doGetChangedDirectories(File repositoryRoot,
                                        String transactionName,
                                        ISVNChangedDirectoriesHandler handler)
                                 throws SVNException

  Passes paths of directories changed in the given transaction to the provided handler. Paths are absolute (start with `'/'`).

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
    `handler` - a path handler
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetHistory

    public void doGetHistory(File repositoryRoot,
                             String path,
                             SVNRevision revision,
                             boolean includeIDs,
                             ISVNHistoryHandler handler)
                      throws SVNException

  Passes history information for the specified path and revision to the provided handler. This information is provided as `SVNAdminPath` objects and include the following pieces:
  - path (use `SVNAdminPath.getPath()` to retrieve it)
  - revision (use `SVNAdminPath.getRevision()` to retrieve it)
  - node id (optional, use `SVNAdminPath.getNodeID()` to retrieve it)
  For history retrieval only these listed `get` methods of SVNAdminPath are relevant.

  `path` must be absolute, that is it must start with `'/'`. If `path` is null it defaults to `"/"`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
    `revision` - a revision number
    `includeIDs` - if true a node revision id is also included for each path
    `handler` - a history handler
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found

### doGetLock

    public SVNLock doGetLock(File repositoryRoot,
                             String path)
                      throws SVNException

  Retrieves lock information for the specified path. `path` must be absolute, that is it must start with `'/'`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
  Returns:
    an object containing details of a lock or null if the path is not locked
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found

### doGetTree

    public void doGetTree(File repositoryRoot,
                          String path,
                          SVNRevision revision,
                          boolean includeIDs,
                          ISVNTreeHandler handler)
                   throws SVNException

  Traverses repository tree starting at the specified path in the given revision and invoking the provided handler on each path. Path information is provided as `SVNAdminPath` objects and include the following pieces:
  - path (use `SVNAdminPath.getPath()` to retrieve it)
  - tree depth (use `SVNAdminPath.getTreeDepth()` to retrieve it)
  - node id (optional, use `SVNAdminPath.getNodeID()` to retrieve it)
  - file/dir information (use `SVNAdminPath.isDir()` to retrieve it)
  For tree retrieval only these listed `get` methods of SVNAdminPath are relevant.

  `path` must be absolute, that is it must start with `'/'`. If `path` is null it defaults to `"/"`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
    `revision` - a revision number
    `includeIDs` - if true a node revision id is also included for each path
    `handler` - a tree handler
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found

### doGetTree

    public void doGetTree(File repositoryRoot,
                          String path,
                          String transactionName,
                          boolean includeIDs,
                          ISVNTreeHandler handler)
                   throws SVNException

  Traverses repository tree starting at the specified path in the given transaction and invoking the provided handler on each path. Path information is provided as `SVNAdminPath` objects and include the following pieces:
  - path (use `SVNAdminPath.getPath()` to retrieve it)
  - tree depth (use `SVNAdminPath.getTreeDepth()` to retrieve it)
  - node id (optional, use `SVNAdminPath.getNodeID()` to retrieve it)
  - file/dir information (use `SVNAdminPath.isDir()` to retrieve it)
  For tree retrieval only these listed `get` methods of SVNAdminPath are relevant.

  `path` must be absolute, that is it must start with `'/'`. If `path` is null it defaults to `"/"`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
    `transactionName` - a transaction name
    `includeIDs` - if true a node revision id is also included for each path
    `handler` - a tree handler
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found
    - if the specified transaction is not found

### doGetDiff

    public void doGetDiff(File repositoryRoot,
                          SVNRevision revision,
                          boolean diffDeleted,
                          boolean diffAdded,
                          boolean diffCopyFrom,
                          OutputStream os)
                   throws SVNException

  Writes differences of changed files and properties for the given revision to the provided output stream. If no special diff generator `was provided` to this client a default GNU-style diff generator is used (which writes differences just like the `'svnlook diff'` command).

  The provided output stream is not closed within this method.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
    `diffDeleted` - if true differences for deleted files are included, otherwise not
    `diffAdded` - if true differences for added files are included, otherwise not
    `diffCopyFrom` - if true writes differences against the copy source (if any), otherwise not
    `os` - an output stream to write differences to
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetDiff

    public void doGetDiff(File repositoryRoot,
                          String transactionName,
                          boolean diffDeleted,
                          boolean diffAdded,
                          boolean diffCopyFrom,
                          OutputStream os)
                   throws SVNException

  Writes differences of changed files and properties for the given transaction to the provided output stream. If no special diff generator `was provided` to this client a default GNU-style diff generator is used (which writes differences just like the `'svnlook diff'` command).

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
    `diffDeleted` - if true differences for deleted files are included, otherwise not
    `diffAdded` - if true differences for added files are included, otherwise not
    `diffCopyFrom` - if true writes differences against the copy source (if any), otherwise not
    `os` - an output stream to write differences to
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetProperty

    public String doGetProperty(File repositoryRoot,
                                String propName,
                                String path,
                                SVNRevision revision)
                         throws SVNException

  Returns the value of a versioned property for the specified path in the given revision.

  `path` must be absolute, that is it must start with `'/'`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `propName` - a property name
    `path` - an absolute path
    `revision` - a revision number
  Returns:
    the value of a property
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found

### doGetProperties

    public Map doGetProperties(File repositoryRoot,
                               String path,
                               SVNRevision revision)
                        throws SVNException

  Returns versioned properties for the specified path in the given revision.

  `path` must be absolute, that is it must start with `'/'`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
    `revision` - a revision number
  Returns:
    name (String) to value (String) mappings
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found

### doGetProperty

    public String doGetProperty(File repositoryRoot,
                                String propName,
                                String path,
                                String transactionName)
                         throws SVNException

  Returns the value of a versioned property for the specified path in the given transaction.

  `path` must be absolute, that is it must start with `'/'`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `propName` - a property name
    `path` - an absolute path
    `transactionName` - a transaction name
  Returns:
    the value of a property
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found
    - if the specified transaction is not found

### doGetProperties

    public Map doGetProperties(File repositoryRoot,
                               String path,
                               String transactionName)
                        throws SVNException

  Returns versioned properties for the specified path in the given transaction.

  `path` must be absolute, that is it must start with `'/'`.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `path` - an absolute path
    `transactionName` - a transaction name
  Returns:
    name (String) to value (String) mappings
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if `path` is not found
    - if the specified transaction is not found

### doGetRevisionProperty

    public String doGetRevisionProperty(File repositoryRoot,
                                        String propName,
                                        SVNRevision revision)
                                 throws SVNException

  Returns the value of a revision property in the given revision.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `propName` - a property name
    `revision` - a revision number
  Returns:
    the value of a revision property
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetRevisionProperties

    public Map doGetRevisionProperties(File repositoryRoot,
                                       SVNRevision revision)
                                throws SVNException

  Returns revision properties in the given revision.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `revision` - a revision number
  Returns:
    name (String) to value (String) mappings
  Throws:
    `SVNException` - no repository is found at `repositoryRoot`

### doGetRevisionProperty

    public String doGetRevisionProperty(File repositoryRoot,
                                        String propName,
                                        String transactionName)
                                 throws SVNException

  Returns the value of a revision property for the given transaction.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `propName` - a property name
    `transactionName` - a transaction name
  Returns:
    the value of a revision property
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### doGetRevisionProperties

    public Map doGetRevisionProperties(File repositoryRoot,
                                       String transactionName)
                                throws SVNException

  Returns revision properties for the given transaction.

  Parameters:
    `repositoryRoot` - a repository root directory path
    `transactionName` - a transaction name
  Returns:
    name (String) to value (String) mappings
  Throws:
    `SVNException` -
    - no repository is found at `repositoryRoot`
    - if the specified transaction is not found

### setDiffGenerator

    public void setDiffGenerator(ISVNGNUDiffGenerator diffGenerator)

  Sets a diff generator to be used in `doGetDiff()` methods of this class.

  Parameters:
    `diffGenerator` -
  See Also:
    `getDiffGenerator()`

### getDiffGenerator

    public ISVNGNUDiffGenerator getDiffGenerator()

  Returns a diff generator to be used in `doGetDiff()` methods of this class. If no generator was provided by a caller, SVNLookClient uses a default one that prints differences in a GNU-style.

  Returns:
    a diff generator
  See Also:
    `setDiffGenerator(ISVNGNUDiffGenerator)`

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