Package org.apache.velocity.example

Class DBContext

java.lang.Object

org.apache.velocity.context.InternalContextBase

org.apache.velocity.context.AbstractContext

org.apache.velocity.example.DBContext

All Implemented Interfaces:

Context, InternalEventContext, InternalHousekeepingContext

public class DBContext
extends AbstractContext

Example context impl that uses a database to store stuff :) yes, this is silly expects a mysql db test with table CREATE TABLE contextstore ( k varchar(100), val blob ); very fragile, crappy code.... just a demo!

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Connection	conn

Constructor Summary

Constructors

Constructor	Description
DBContext()
DBContext(Context inner)

Method Summary

Modifier and Type	Method	Description
boolean	internalContainsKey(String key)	Not implementing.
Object	internalGet(String key)	retrieves a serialized object from the db and returns the living instance to the caller.
String[]	internalGetKeys()	Not implementing.
Object	internalPut(String key, Object value)	Serializes and stores an object in the database.
Object	internalRemove(String key)	Not implementing.
private void	setup()

Methods inherited from class org.apache.velocity.context.AbstractContext

containsKey, get, getChainedContext, getKeys, put, remove

Methods inherited from class org.apache.velocity.context.InternalContextBase

attachEventCartridge, getCurrentMacroCallDepth, getCurrentMacroName, getCurrentResource, getCurrentTemplateName, getEventCartridge, getMacroLibraries, getMacroNameStack, getTemplateNameStack, icacheGet, icachePut, popCurrentMacroName, popCurrentTemplateName, pushCurrentMacroName, pushCurrentTemplateName, setCurrentResource, setMacroLibraries

Methods inherited from class java.lang.Object

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

Field Details

conn

Connection conn

Constructor Details

DBContext

public DBContext()

DBContext

public DBContext(Context inner)

Method Details

internalGet

public Object internalGet(String key)

retrieves a serialized object from the db and returns the living instance to the caller.

Specified by:

internalGet in class AbstractContext

Parameters:

key - key whose associated value is to be returned

Returns:

object stored in the context

internalPut

public Object internalPut(String key,
 Object value)

Serializes and stores an object in the database. This is really a hokey way to do it, and will cause problems. The right way is to use a prepared statement...

Specified by:

internalPut in class AbstractContext

Parameters:

key - key with which to associate the value

value - value to be associated with the key

Returns:

previously stored value if exists, or null

internalContainsKey

public boolean internalContainsKey(String key)

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalContainsKey in class AbstractContext

Parameters:

key - key to test for existence

Returns:

true if found, false if not

internalGetKeys

public String[] internalGetKeys()

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalGetKeys in class AbstractContext

Returns:

array of keys

internalRemove

public Object internalRemove(String key)

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalRemove in class AbstractContext

Parameters:

key - key to remove

Returns:

object removed if exists, else null

setup

private void setup()