Package org.apache.jackrabbit.core.fs.db

Class DatabaseFileSystem

java.lang.Object

org.apache.jackrabbit.core.fs.db.DatabaseFileSystem

All Implemented Interfaces:

FileSystem

Direct Known Subclasses:

DbFileSystem, JNDIDatabaseFileSystem

public abstract class DatabaseFileSystem
extends Object
implements FileSystem

Base class for database file systems. This class contains common functionality for database file system subclasses that normally differ only in the way the database connection is acquired.

See the DbFileSystem for a detailed description of the available configuration options and database behaviour.

Field Summary

Fields

Modifier and Type	Field	Description
protected ConnectionHelper	conHelper	the ConnectionHelper set in the init() method
protected String	copyFileSQL
protected String	copyFilesSQL
protected String	deleteFileSQL
protected String	deleteFolderSQL
protected static int	INITIAL_BUFFER_SIZE
protected boolean	initialized
protected String	insertFileSQL
protected String	insertFolderSQL
protected String	schema
protected String	schemaObjectPrefix
protected String	selectChildCountSQL
protected String	selectDataSQL
protected String	selectExistSQL
protected String	selectFileAndFolderNamesSQL
protected String	selectFileExistSQL
protected String	selectFileNamesSQL
protected String	selectFolderExistSQL
protected String	selectFolderNamesSQL
protected String	selectLastModifiedSQL
protected String	selectLengthSQL
protected String	updateDataSQL
protected String	updateLastModifiedSQL

Fields inherited from interface org.apache.jackrabbit.core.fs.FileSystem

SEPARATOR, SEPARATOR_CHAR

Constructor Summary

Constructors

Constructor	Description
DatabaseFileSystem()	Default constructor

Method Summary

Modifier and Type	Method	Description
protected void	buildSQLStatements()	Builds the SQL statements
void	close()	Close the file system.
protected CheckSchemaOperation	createCheckSchemaOperation()	This method is called from init() after the createConnectionHelper(DataSource) method, and returns a default CheckSchemaOperation.
protected ConnectionHelper	createConnectionHelper(DataSource dataSrc)	This method is called from the init() method of this class and returns a ConnectionHelper instance which is assigned to the conHelper field.
protected void	createDeepFolder(String folderPath)	Creates the specified files system folder entry, recursively creating any non-existing intermediate folder entries.
void	createFolder(String folderPath)	Creates the folder named by this path, including any necessary but nonexistent parent folders.
void	deleteFile(String filePath)	Deletes the file denoted by this path.
void	deleteFolder(String folderPath)	Deletes the folder denoted by this path.
boolean	equals(Object obj)
boolean	exists(String path)	Tests whether the file system entry denoted by this path exists.
protected abstract DataSource	getDataSource()
InputStream	getInputStream(String filePath)	Returns an input stream of the contents of the file denoted by this path.
OutputStream	getOutputStream(String filePath)	Returns an output stream for writing bytes to the file denoted by this path.
String	getSchema()
String	getSchemaObjectPrefix()
boolean	hasChildren(String path)	Tests whether the file system entry denoted by this path has child entries.
int	hashCode()	Returns zero to satisfy the Object equals/hashCode contract.
void	init()	Initialize the file system
boolean	isFile(String path)	Tests whether the file system entry denoted by this path exists and is a file.
boolean	isFolder(String path)	Tests whether the file system entry denoted by this path exists and is a folder.
boolean	isSchemaCheckEnabled()
long	lastModified(String path)	Returns the time that the file system entry denoted by this path was last modified.
long	length(String filePath)	Returns the length of the file denoted by this path.
String[]	list(String folderPath)	Returns an array of strings naming the files and folders in the folder denoted by this path.
String[]	listFiles(String folderPath)	Returns an array of strings naming the files in the folder denoted by this path.
String[]	listFolders(String folderPath)	Returns an array of strings naming the folders in the folder denoted by this path.
void	setSchema(String schema)
void	setSchemaCheckEnabled(boolean enabled)
void	setSchemaObjectPrefix(String schemaObjectPrefix)
protected void	verifyRootExists()	Verifies that the root file system entry exists.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

initialized

protected boolean initialized

schema

protected String schema

schemaObjectPrefix

protected String schemaObjectPrefix

INITIAL_BUFFER_SIZE

protected static final int INITIAL_BUFFER_SIZE

See Also:

Constant Field Values

conHelper

protected ConnectionHelper conHelper

the ConnectionHelper set in the init() method

selectExistSQL

protected String selectExistSQL

selectFileExistSQL

protected String selectFileExistSQL

selectFolderExistSQL

protected String selectFolderExistSQL

selectChildCountSQL

protected String selectChildCountSQL

selectDataSQL

protected String selectDataSQL

selectLastModifiedSQL

protected String selectLastModifiedSQL

selectLengthSQL

protected String selectLengthSQL

selectFileNamesSQL

protected String selectFileNamesSQL

selectFolderNamesSQL

protected String selectFolderNamesSQL

selectFileAndFolderNamesSQL

protected String selectFileAndFolderNamesSQL

deleteFileSQL

protected String deleteFileSQL

deleteFolderSQL

protected String deleteFolderSQL

insertFileSQL

protected String insertFileSQL

insertFolderSQL

protected String insertFolderSQL

updateDataSQL

protected String updateDataSQL

updateLastModifiedSQL

protected String updateLastModifiedSQL

copyFileSQL

protected String copyFileSQL

copyFilesSQL

protected String copyFilesSQL

Constructor Detail

DatabaseFileSystem

public DatabaseFileSystem()

Default constructor

Method Detail

getSchemaObjectPrefix

public String getSchemaObjectPrefix()

setSchemaObjectPrefix

public void setSchemaObjectPrefix(String schemaObjectPrefix)

getSchema

public String getSchema()

setSchema

public void setSchema(String schema)

isSchemaCheckEnabled

public final boolean isSchemaCheckEnabled()

Returns:

whether the schema check is enabled

setSchemaCheckEnabled

public final void setSchemaCheckEnabled(boolean enabled)

Parameters:

enabled - set whether the schema check is enabled

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns zero to satisfy the Object equals/hashCode contract. This class is mutable and not meant to be used as a hash key.

Overrides:

hashCode in class Object

Returns:

always zero

See Also:

Object.hashCode()

init

public void init()
          throws FileSystemException

Initialize the file system

Specified by:

init in interface FileSystem

Throws:

FileSystemException - if the file system initialization fails

getDataSource

protected abstract DataSource getDataSource()
                                     throws Exception

Returns:

Throws:

Exception

createConnectionHelper

protected ConnectionHelper createConnectionHelper(DataSource dataSrc)
                                           throws Exception

This method is called from the init() method of this class and returns a ConnectionHelper instance which is assigned to the conHelper field. Subclasses may override it to return a specialized connection helper.

Parameters:

dataSrc - the DataSource of this persistence manager

Returns:

a ConnectionHelper

Throws:

Exception - on error

createCheckSchemaOperation

protected CheckSchemaOperation createCheckSchemaOperation()

This method is called from init() after the createConnectionHelper(DataSource) method, and returns a default CheckSchemaOperation. Subclasses can overrride this implementation to get a customized implementation.

Returns:

a new CheckSchemaOperation instance

close

public void close()
           throws FileSystemException

Close the file system. After calling this method, the file system is no longer accessible.

Specified by:

close in interface FileSystem

Throws:

FileSystemException

createFolder

public void createFolder(String folderPath)
                  throws FileSystemException

Creates the folder named by this path, including any necessary but nonexistent parent folders. Note that if this operation fails it may have succeeded in creating some of the necessary parent folders.

Specified by:

createFolder in interface FileSystem

Parameters:

folderPath - the path of the folder to be created.

Throws:

FileSystemException - if a file system entry denoted by path already exists or if another error occurs.

deleteFile

public void deleteFile(String filePath)
                throws FileSystemException

Deletes the file denoted by this path.

Specified by:

deleteFile in interface FileSystem

Parameters:

filePath - the path of the file to be deleted.

Throws:

FileSystemException - if this path does not denote a file or if another error occurs.

deleteFolder

public void deleteFolder(String folderPath)
                  throws FileSystemException

Deletes the folder denoted by this path. Any contents of this folder (folders and files) will be deleted recursively.

Specified by:

deleteFolder in interface FileSystem

Parameters:

folderPath - the path of the folder to be deleted.

Throws:

FileSystemException - if this path does not denote a folder or if another error occurs.

exists

public boolean exists(String path)
               throws FileSystemException

Tests whether the file system entry denoted by this path exists.

Specified by:

exists in interface FileSystem

Parameters:

path - the path of a file system entry.

Returns:

true if the file system entry at path exists; false otherwise.

Throws:

FileSystemException

isFile

public boolean isFile(String path)
               throws FileSystemException

Tests whether the file system entry denoted by this path exists and is a file.

Specified by:

isFile in interface FileSystem

Parameters:

path - the path of a file system entry.

Returns:

true if the file system entry at path is a file; false otherwise.

Throws:

FileSystemException

isFolder

public boolean isFolder(String path)
                 throws FileSystemException

Tests whether the file system entry denoted by this path exists and is a folder.

Specified by:

isFolder in interface FileSystem

Parameters:

path - the path of a file system entry.

Returns:

true if the file system entry at path is a folder; false otherwise.

Throws:

FileSystemException

lastModified

public long lastModified(String path)
                  throws FileSystemException

Returns the time that the file system entry denoted by this path was last modified.

Specified by:

lastModified in interface FileSystem

Parameters:

path - the path of a file system entry.

Returns:

A long value representing the time the file system entry was last modified, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970), or 0L if the modification time can't be determined.

Throws:

FileSystemException - if the file system entry does not exist.

length

public long length(String filePath)
            throws FileSystemException

Returns the length of the file denoted by this path.

Specified by:

length in interface FileSystem

Parameters:

filePath - the path of the file.

Returns:

The length, in bytes, of the file denoted by this path, or -1L if the length can't be determined.

Throws:

FileSystemException - if the path does not denote an existing file.

hasChildren

public boolean hasChildren(String path)
                    throws FileSystemException

Tests whether the file system entry denoted by this path has child entries.

Specified by:

hasChildren in interface FileSystem

Parameters:

path - the path of a file system entry.

Returns:

true if the file system entry at path has child entries; false otherwise.

Throws:

FileSystemException

list

public String[] list(String folderPath)
              throws FileSystemException

Returns an array of strings naming the files and folders in the folder denoted by this path.

Specified by:

list in interface FileSystem

Parameters:

folderPath - the path of the folder whose contents is to be listed.

Returns:

an array of strings naming the files and folders in the folder denoted by this path.

Throws:

FileSystemException - if this path does not denote a folder or if another error occurs.

listFiles

public String[] listFiles(String folderPath)
                   throws FileSystemException

Returns an array of strings naming the files in the folder denoted by this path.

Specified by:

listFiles in interface FileSystem

Parameters:

folderPath - the path of the folder whose contents is to be listed.

Returns:

an array of strings naming the files in the folder denoted by this path.

Throws:

FileSystemException - if this path does not denote a folder or if another error occurs.

listFolders

public String[] listFolders(String folderPath)
                     throws FileSystemException

Returns an array of strings naming the folders in the folder denoted by this path.

Specified by:

listFolders in interface FileSystem

Parameters:

folderPath - the path of the folder whose contents is to be listed.

Returns:

an array of strings naming the folders in the folder denoted by this path.

Throws:

FileSystemException - if this path does not denote a folder or if another error occurs.

getInputStream

public InputStream getInputStream(String filePath)
                           throws FileSystemException

Returns an input stream of the contents of the file denoted by this path.

Specified by:

getInputStream in interface FileSystem

Parameters:

filePath - the path of the file.

Returns:

an input stream of the contents of the file.

Throws:

FileSystemException - if the file does not exist or if it cannot be read from

getOutputStream

public OutputStream getOutputStream(String filePath)
                             throws FileSystemException

Returns an output stream for writing bytes to the file denoted by this path. The file will be created if it doesn't exist. If the file exists, its contents will be overwritten.

Specified by:

getOutputStream in interface FileSystem

Parameters:

filePath - the path of the file.

Returns:

an output stream for writing bytes to the file.

Throws:

FileSystemException - if the file cannot be written to or created

buildSQLStatements

protected void buildSQLStatements()

Builds the SQL statements

verifyRootExists

protected void verifyRootExists()
                         throws Exception

Verifies that the root file system entry exists. If it doesn't exist yet it will be automatically created.

Throws:

Exception - if an error occurs

createDeepFolder

protected void createDeepFolder(String folderPath)
                         throws FileSystemException

Creates the specified files system folder entry, recursively creating any non-existing intermediate folder entries.

Parameters:

folderPath - folder entry to create

Throws:

FileSystemException - if an error occurs