org.opencms.util
Class CmsRfsFileViewer

java.lang.Object
  org.opencms.util.CmsRfsFileViewer

All Implemented Interfaces:

java.lang.Cloneable

public class CmsRfsFileViewer
extends java.lang.Object
implements java.lang.Cloneable

The representation of a RFS file along with the settings to provide access to certain portions (amount of lines) of it.

Most often the underlying file will be the OpenCms logfile.

The portion of the file that is shown is defined by a "window" of "windowSize" lines of text at a position "windowPosition" which is an enumeration of windows in ascending order.

Since:

6.0.0

Version:

$Revision: 1.29 $

Author:

Achim Westermann

Field Summary

protected static org.apache.commons.logging.Log	LOG The log object for this class.
protected java.util.Map	m_fileName2lineIndex Maps file paths to internal info instances.
protected java.lang.String	m_filePath The path to the underlying file.
protected java.lang.String	m_rootPath The path to the root for all accessible files.
protected int	m_windowPos The current window (numbered from zero to amount of possible different windows).
protected int	m_windowSize The amount of lines to show.

Constructor Summary

CmsRfsFileViewer()
Creates an instance with default settings that tries to use the log file path obtained from OpenCms's CmsSystemInfo instance.

Method Summary

java.lang.Object	clone() Returns a clone of this file view settings that is not "frozen" and therefore allows modifications.
java.lang.String	getFileEncoding() Returns the canonical name of the character encoding of the underlying file.
java.lang.String	getFilePath() Returns the path denoting the file that is accessed.
boolean	getIsLogfile() Returns true if the view's internal file path points to a log file in standard OpenCms format.
java.lang.String	getRootPath() Returns the path denoting the root folder for all accessible files.
int	getWindowPos() Returns the start position of the current display.
int	getWindowSize() Get the amount of lines (or entries depending on whether a standard log file is shown) to display per page.
boolean	isEnabled() Returns true if this view upon the underlying file via readFilePortion() is enabled.
java.lang.String	readFilePortion() Return the view portion of lines of text from the underlying file or an empty String if isEnabled() returns false.
void	setEnabled(boolean preview) Set the boolean that decides if the view to the underlying file via readFilePortion() is enabled.
void	setFileEncoding(java.lang.String fileEncoding) Set the character encoding of the underlying file.
void	setFilePath(java.lang.String path) Set the path in the real file system that points to the file that should be displayed.
void	setFrozen(boolean frozen) Package friendly access that allows the CmsWorkplaceManager to "freeze" this instance within the system-wide assignment in it's CmsWorkplaceManager.setFileViewSettings(org.opencms.file.CmsObject, CmsRfsFileViewer) method.
void	setIsLogfile(boolean isLogfile) Set if the internal file is in standard log file format (true) or not (false).
void	setRootPath(java.lang.String path) Set the path in the real file system that points to the folder/tree containing the log files.
void	setWindowPos(int windowPos) Sets the start position of the current display.
void	setWindowSize(int windowSize) Set the amount of lines (or entries depending on whether a standard log file is shown) to display per page.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

protected static final org.apache.commons.logging.Log LOG

The log object for this class.

m_fileName2lineIndex

protected java.util.Map m_fileName2lineIndex

Maps file paths to internal info instances.

m_filePath

protected java.lang.String m_filePath

The path to the underlying file.

m_rootPath

protected java.lang.String m_rootPath

The path to the root for all accessible files.

m_windowPos

protected int m_windowPos

The current window (numbered from zero to amount of possible different windows).

m_windowSize

protected int m_windowSize

The amount of lines to show.

Constructor Detail

CmsRfsFileViewer

public CmsRfsFileViewer()

Creates an instance with default settings that tries to use the log file path obtained from OpenCms's CmsSystemInfo instance.

If the log file path is invalid or not configured correctly a logging is performed and the path remains empty to allow user-specified file selection.

Method Detail

clone

public java.lang.Object clone()

Returns a clone of this file view settings that is not "frozen" and therefore allows modifications.

Every instance that plans to modify settings has to obtain a clone first that may be modified. The original instance returned from (CmsWorkplaceManager.getFileViewSettings()) will throw a CmsRuntimeException for each setter invocation.

Overrides:

clone in class java.lang.Object

Returns:

a clone of this file view settings that is not "frozen" and therefore allows modifications

getFileEncoding

public java.lang.String getFileEncoding()

Returns the canonical name of the character encoding of the underlying file.

If no special choice is fed into setFileEncoding(String) before this call always the system default character encoding is returned.

This value may be ignored outside and will be ignored inside if the underlying does not contain textual content.

Returns:

the canonical name of the character encoding of the underlying file

getFilePath

public java.lang.String getFilePath()

Returns the path denoting the file that is accessed.

Returns:

the path denoting the file that is accessed

getIsLogfile

public boolean getIsLogfile()

Returns true if the view's internal file path points to a log file in standard OpenCms format.

Returns:

true if the view's internal file path points to a log file in standard OpenCms format

getWindowPos

public int getWindowPos()

Returns the start position of the current display.

This is a count of "windows" that consist of viewable text with "windowSize" lines of text (for a non-standard log file) or log-entries (for a standard log file).

Returns:

the start position of the current display

getRootPath

public java.lang.String getRootPath()

Returns the path denoting the root folder for all accessible files.

Returns:

the path denoting the root folder for all accessible files

getWindowSize

public int getWindowSize()

Get the amount of lines (or entries depending on whether a standard log file is shown) to display per page.

Returns:

the amount of lines to display per page

isEnabled

public boolean isEnabled()

Returns true if this view upon the underlying file via readFilePortion() is enabled.

Returns:

true if this view upon the underlying file via readFilePortion() is enabled.

readFilePortion

public java.lang.String readFilePortion()
                                 throws CmsRfsException

Return the view portion of lines of text from the underlying file or an empty String if isEnabled() returns false.

Returns:

the view portion of lines of text from the underlying file or an empty String if isEnabled() returns false

Throws:

CmsRfsException - if something goes wrong

setEnabled

public void setEnabled(boolean preview)

Set the boolean that decides if the view to the underlying file via readFilePortion() is enabled.

Parameters:

preview - the boolean that decides if the view to the underlying file via readFilePortion() is enabled

setFileEncoding

public void setFileEncoding(java.lang.String fileEncoding)

Set the character encoding of the underlying file.

The given String has to match a valid char set name (canonical or alias) of one of the system's supported Charset instances (see Charset.forName(java.lang.String)).

This setting will be used for reading the file. This enables to correctly display files with text in various encodings in UIs.

Parameters:

fileEncoding - the character encoding of the underlying file to set

setFilePath

public void setFilePath(java.lang.String path)
                 throws CmsRfsException,
                        CmsRuntimeException

Set the path in the real file system that points to the file that should be displayed.

This method will only success if the file specified by the path argument is valid within the file system, no folder and may be read by the OpenCms process on the current platform.

Parameters:

path - the path in the real file system that points to the file that should be displayed to set

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen

CmsRfsException - if the given path is invalid, does not point to a file or cannot be accessed

setFrozen

public void setFrozen(boolean frozen)
               throws CmsRuntimeException

Package friendly access that allows the CmsWorkplaceManager to "freeze" this instance within the system-wide assignment in it's CmsWorkplaceManager.setFileViewSettings(org.opencms.file.CmsObject, CmsRfsFileViewer) method.

Parameters:

frozen - if true this instance will freeze and throw CmsRuntimeExceptions upon setter invocations

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen (setFrozen(boolean))

setIsLogfile

public void setIsLogfile(boolean isLogfile)
                  throws CmsRuntimeException

Set if the internal file is in standard log file format (true) or not (false).

If set to true the file might be treated / displayed in a more convenient format than standard files in future. Currently it is only inverted (last lines appear first) and only the last 'Window Size' lines of the file are displayed.

Do not activate this (it is possible from the log file viewer settings in the workplace administration) if your selected file is no log file: The display will confuse you and be more expensive (imaging scrolling a 20 MB file to view the last 200 lines).

Parameters:

isLogfile - determines if the internal file is in standard log file format (true) or not (false)

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen (setFrozen(boolean))

setRootPath

public void setRootPath(java.lang.String path)
                 throws CmsRfsException,
                        CmsRuntimeException

Set the path in the real file system that points to the folder/tree containing the log files.

This method will only success if the folder specified by the path argument is valid within the file system.

Parameters:

path - the path in the real file system that points to the folder containing the log files

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen

CmsRfsException - if the given path is invalid

setWindowPos

public void setWindowPos(int windowPos)
                  throws CmsRuntimeException

Sets the start position of the current display.

This is a count of "windows" that consist of viewable text with "windowSize" lines of text (for a non-standard log file) or log-entries (for a standard log file).

Parameters:

windowPos - the start position of the current display to set

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen (setFrozen(boolean))

setWindowSize

public void setWindowSize(int windowSize)
                   throws CmsRuntimeException

Set the amount of lines (or entries depending on whether a standard log file is shown) to display per page.

Parameters:

windowSize - the amount of lines to display per page

Throws:

CmsRuntimeException - if the configuration of this instance has been frozen (setFrozen(boolean))