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org.apache.excalibur.store.impl
Class AbstractFilesystemStore

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.excalibur.store.impl.AbstractReadWriteStore
          org.apache.excalibur.store.impl.AbstractFilesystemStore

All Implemented Interfaces:

Component, LogEnabled, Store, ThreadSafe

public abstract class AbstractFilesystemStore

extends AbstractReadWriteStore

implements Store, ThreadSafe

Stores objects on the filesystem: String objects as text files, all other objects are serialized. This class must be subclassed in order to set the directory the store should work on.

Version:

CVS $Id: AbstractFilesystemStore.java,v 1.4 2004/02/28 11:47:31 cziegeler Exp $

Author:

Avalon Development Team

Field Summary

protected java.io.File	m_directoryFile The directory repository
protected java.lang.String	m_directoryPath

Fields inherited from class org.apache.excalibur.store.impl.AbstractReadWriteStore

lock

Fields inherited from interface org.apache.excalibur.store.Store

PERSISTENT_STORE, ROLE, TRANSIENT_STORE

Constructor Summary

AbstractFilesystemStore()

Method Summary

protected void	addKeys(org.apache.excalibur.store.impl.AbstractFilesystemStore.FSEnumeration enumer, java.io.File directory)
protected int	countKeys(java.io.File directory)
protected java.lang.String	decode(java.lang.String filename) Inverse of encode exept it do not use path.
java.lang.Object	deserializeObject(java.io.File file) This method deserializes an object from an input stream.
java.lang.String	deserializeString(java.io.File file) Load a text file contents as a String.
protected void	doClear() Clear the Store of all elements
protected boolean	doContainsKey(java.lang.Object key) Indicates if the given key is associated to a contained object.
protected void	doFree() Try to free some used memory.
protected java.lang.Object	doGet(java.lang.Object key) Get the File object associated with the given unique key name.
protected java.util.Enumeration	doGetKeys() Returns the list of stored files as an Enumeration of Files
protected int	doGetSize() Returns count of the objects in the store, or -1 if could not be obtained.
protected void	doRemove(java.lang.Object key) Remove the object associated to the given key.
protected void	doStore(java.lang.Object key, java.lang.Object value) Store the given object in a persistent state.
protected java.lang.String	encode(java.lang.String s) Returns a String that uniquely identifies the object.
protected java.io.File	fileFromKey(java.lang.Object key)
void	free() Try to free some used memory.
java.lang.String	getDirectoryPath() Returns the repository's full pathname
java.lang.String	getFullFilename(java.io.File file) Get the complete filename corresponding to a (typically relative) File.
java.lang.Object	getObject(java.lang.Object key)
java.lang.String	getString(java.lang.Object key)
void	serializeObject(java.io.File file, java.lang.Object object) This method serializes an object to an output stream.
void	serializeString(java.io.File file, java.lang.String string) Dump a String to a text file.
void	setDirectory(java.io.File directory) Sets the repository's location
void	setDirectory(java.lang.String directory) Sets the repository's location

Methods inherited from class org.apache.excalibur.store.impl.AbstractReadWriteStore

clear, containsKey, get, getChildInstrumentables, getInstrumentableName, getInstruments, keys, remove, setInstrumentableName, size, store

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.excalibur.store.Store

clear, containsKey, get, keys, remove, size, store

Field Detail

m_directoryFile

protected java.io.File m_directoryFile

The directory repository

m_directoryPath

protected volatile java.lang.String m_directoryPath

Constructor Detail

AbstractFilesystemStore

public AbstractFilesystemStore()

Method Detail

setDirectory

public void setDirectory(java.lang.String directory)
                  throws java.io.IOException

Sets the repository's location

Throws:

java.io.IOException

setDirectory

public void setDirectory(java.io.File directory)
                  throws java.io.IOException

Sets the repository's location

Throws:

java.io.IOException

getDirectoryPath

public java.lang.String getDirectoryPath()

Returns the repository's full pathname

doGet

protected java.lang.Object doGet(java.lang.Object key)

Get the File object associated with the given unique key name.

Specified by:

doGet in class AbstractReadWriteStore

doStore

protected void doStore(java.lang.Object key,
                       java.lang.Object value)
                throws java.io.IOException

Store the given object in a persistent state. 1) Null values generate empty directories. 2) String values are dumped to text files 3) Object values are serialized

Specified by:

doStore in class AbstractReadWriteStore

Throws:

java.io.IOException

doRemove

protected void doRemove(java.lang.Object key)

Remove the object associated to the given key.

Specified by:

doRemove in class AbstractReadWriteStore

doClear

protected void doClear()

Clear the Store of all elements

Specified by:

doClear in class AbstractReadWriteStore

doContainsKey

protected boolean doContainsKey(java.lang.Object key)

Indicates if the given key is associated to a contained object.

Specified by:

doContainsKey in class AbstractReadWriteStore

doGetKeys

protected java.util.Enumeration doGetKeys()

Returns the list of stored files as an Enumeration of Files

Specified by:

doGetKeys in class AbstractReadWriteStore

doGetSize

protected int doGetSize()

Returns count of the objects in the store, or -1 if could not be obtained.

Specified by:

doGetSize in class AbstractReadWriteStore

addKeys

protected void addKeys(org.apache.excalibur.store.impl.AbstractFilesystemStore.FSEnumeration enumer,
                       java.io.File directory)

countKeys

protected int countKeys(java.io.File directory)

fileFromKey

protected java.io.File fileFromKey(java.lang.Object key)

getString

public java.lang.String getString(java.lang.Object key)
                           throws java.io.IOException

Throws:

java.io.IOException

free

public void free()

Description copied from interface: Store

Try to free some used memory. The transient store can simply remove some hold data, the persistent store can free all memory by writing the data to a persistent store etc.

Specified by:

free in interface Store

Overrides:

free in class AbstractReadWriteStore

doFree

protected void doFree()

Description copied from class: AbstractReadWriteStore

Try to free some used memory. The transient store can simply remove some hold data, the persistent store can free all memory by writing the data to a persistent store etc.

Specified by:

doFree in class AbstractReadWriteStore

getObject

public java.lang.Object getObject(java.lang.Object key)
                           throws java.io.IOException,
                                  java.lang.ClassNotFoundException

Throws:

java.io.IOException

java.lang.ClassNotFoundException

decode

protected java.lang.String decode(java.lang.String filename)

Inverse of encode exept it do not use path. So decode(encode(s) - m_path) = s. In other words it returns a String that can be used as key to retive the record contained in the 'filename' file.

encode

protected java.lang.String encode(java.lang.String s)

Returns a String that uniquely identifies the object. Note: since this method uses the Object.toString() method, it's up to the caller to make sure that this method doesn't change between different JVM executions (like it may normally happen). For this reason, it's highly recommended (even if not mandated) that Strings be used as keys.

serializeString

public void serializeString(java.io.File file,
                            java.lang.String string)
                     throws java.io.IOException

Dump a String to a text file.

Parameters:

file - The output file

string - The string to be dumped

Throws:

java.io.IOException - IO Error

deserializeString

public java.lang.String deserializeString(java.io.File file)
                                   throws java.io.IOException

Load a text file contents as a String. This method does not perform enconding conversions

Parameters:

file - The input file

Returns:

The file contents as a String

Throws:

java.io.IOException - IO Error

serializeObject

public void serializeObject(java.io.File file,
                            java.lang.Object object)
                     throws java.io.IOException

This method serializes an object to an output stream.

Parameters:

file - The output file

object - The object to be serialized

Throws:

java.io.IOException - IOError

deserializeObject

public java.lang.Object deserializeObject(java.io.File file)
                                   throws java.io.IOException,
                                          java.lang.ClassNotFoundException

This method deserializes an object from an input stream.

Parameters:

file - The input file

Returns:

The deserialized object

Throws:

java.io.IOException - IOError

java.lang.ClassNotFoundException

getFullFilename

public java.lang.String getFullFilename(java.io.File file)

Get the complete filename corresponding to a (typically relative) File. This method accounts for the possibility of an error in getting the filename's canonical path, returning the io/error-safe absolute form instead

Parameters:

file - The file

Returns:

The file's absolute filename