DBContext (Apache Velocity 2.2 API)

java.lang.Object
- org.apache.velocity.context.AbstractContext
- - org.apache.velocity.example.DBContext

All Implemented Interfaces:

Context, InternalEventContext
```
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: DBContext.java 1871468 2019-12-14 12:20:11Z cbrisson $

Author:

Geir Magnusson Jr.

Constructor Summary

Constructors
Constructor and Description

DBContext()

DBContext(Context inner)

Constructors
Constructor and Description
`DBContext()`
`DBContext(Context inner)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`EventCartridge`	`attachEventCartridge(EventCartridge ec)`
`int`	`getCurrentMacroCallDepth()` get the current macro call depth
`String`	`getCurrentMacroName()` get the current macro name
`Resource`	`getCurrentResource()` temporary fix to enable #include() to figure out current encoding.
`String`	`getCurrentTemplateName()` get the current template name
`EventCartridge`	`getEventCartridge()`
`List`	`getMacroLibraries()` Get the macro library list for the current template.
`String[]`	`getMacroNameStack()` get the current macro name stack
`String[]`	`getTemplateNameStack()` get the current template name stack
`IntrospectionCacheData`	`icacheGet(Object key)` returns an IntrospectionCache Data (@see IntrospectionCacheData) object if exists for the key
`void`	`icachePut(Object key, IntrospectionCacheData o)` places an IntrospectionCache Data (@see IntrospectionCacheData) element in the cache for specified key
`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.
`void`	`popCurrentMacroName()` remove the current macro name from stack
`void`	`popCurrentTemplateName()` remove the current template name from stack
`void`	`pushCurrentMacroName(String s)` set the current macro name on top of stack
`void`	`pushCurrentTemplateName(String s)` set the current template name on top of stack
`void`	`setCurrentResource(Resource r)`
`void`	`setMacroLibraries(List macroLibraries)` Set the macro library list for the current template.

Methods inherited from class org.apache.velocity.context.AbstractContext
containsKey, get, getChainedContext, getKeys, put, remove

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

- Constructor Detail
  - DBContext
```
public DBContext()
```
  - DBContext
```
public DBContext(Context inner)
```
- Method Detail
  - 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
  - pushCurrentTemplateName
```
public void pushCurrentTemplateName(String s)
```
    set the current template name on top of stack
    
    Parameters:
    
    s - current template name
  - popCurrentTemplateName
```
public void popCurrentTemplateName()
```
    remove the current template name from stack
  - getCurrentTemplateName
```
public String getCurrentTemplateName()
```
    get the current template name
    
    Returns:
    
    String current template name
  - getTemplateNameStack
```
public String[] getTemplateNameStack()
```
    get the current template name stack
    
    Returns:
    
    String[] with the template name stack contents.
  - pushCurrentMacroName
```
public void pushCurrentMacroName(String s)
```
    set the current macro name on top of stack
    
    Parameters:
    
    s - current macro name
  - popCurrentMacroName
```
public void popCurrentMacroName()
```
    remove the current macro name from stack
  - getCurrentMacroName
```
public String getCurrentMacroName()
```
    get the current macro name
    
    Returns:
    
    String current macro name
  - getCurrentMacroCallDepth
```
public int getCurrentMacroCallDepth()
```
    get the current macro call depth
    
    Returns:
    
    int current macro call depth
  - getMacroNameStack
```
public String[] getMacroNameStack()
```
    get the current macro name stack
    
    Returns:
    
    String[] with the macro name stack contents.
  - icacheGet
```
public IntrospectionCacheData icacheGet(Object key)
```
    returns an IntrospectionCache Data (@see IntrospectionCacheData) object if exists for the key
    
    Parameters:
    
    key - key to find in cache
    
    Returns:
    
    cache object
  - icachePut
```
public void icachePut(Object key,
                      IntrospectionCacheData o)
```
    places an IntrospectionCache Data (@see IntrospectionCacheData) element in the cache for specified key
    
    Parameters:
    
    key - key
    
    o - IntrospectionCacheData object to place in cache
  - setCurrentResource
```
public void setCurrentResource(Resource r)
```
    See Also:
    
    InternalHousekeepingContext.setCurrentResource(org.apache.velocity.runtime.resource.Resource)
  - getCurrentResource
```
public Resource getCurrentResource()
```
    temporary fix to enable #include() to figure out current encoding.
    
    Returns:
    
    The current resource.
    
    See Also:
    
    InternalHousekeepingContext.getCurrentResource()
  - setMacroLibraries
```
public void setMacroLibraries(List macroLibraries)
```
    Set the macro library list for the current template.
    
    Parameters:
    
    macroLibraries - list of macro libraries to set
    
    See Also:
    
    InternalHousekeepingContext.setMacroLibraries(List)
  - getMacroLibraries
```
public List getMacroLibraries()
```
    Get the macro library list for the current template.
    
    Returns:
    
    List of macro library names
    
    See Also:
    
    InternalHousekeepingContext.getMacroLibraries()
  - attachEventCartridge
```
public EventCartridge attachEventCartridge(EventCartridge ec)
```
    Specified by:
    
    attachEventCartridge in interface InternalEventContext
    
    Returns:
    
    The old EventCartridge.
    
    See Also:
    
    InternalEventContext.attachEventCartridge(org.apache.velocity.app.event.EventCartridge)
  - getEventCartridge
```
public EventCartridge getEventCartridge()
```
    Specified by:
    
    getEventCartridge in interface InternalEventContext
    
    Returns:
    
    The current EventCartridge.
    
    See Also:
    
    InternalEventContext.getEventCartridge()

Class DBContext

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

DBContext

DBContext

Method Detail

internalGet

internalPut

internalContainsKey

internalGetKeys

internalRemove

pushCurrentTemplateName

popCurrentTemplateName

getCurrentTemplateName

getTemplateNameStack

pushCurrentMacroName

popCurrentMacroName

getCurrentMacroName

getCurrentMacroCallDepth

getMacroNameStack

icacheGet

icachePut

setCurrentResource

getCurrentResource

setMacroLibraries

getMacroLibraries

attachEventCartridge

getEventCartridge