org.apache.velocity.tools.generic
Class ContextTool

java.lang.Object
  extended by org.apache.velocity.tools.generic.SafeConfig
      extended by org.apache.velocity.tools.generic.ContextTool
Direct Known Subclasses:
ViewContextTool

@DefaultKey(value="context")
@InvalidScope(value={"application","session"})
public class ContextTool
extends SafeConfig

Tool for convenient access to Context data and meta-data.

 Template example(s):
  #foreach( $key in $context.keys )
    $key = $context.get($key)
  #end

 Toolbox configuration:
 <tools>
   <toolbox scope="request">
     <tool class="org.apache.velocity.tools.generic.ContextTool"/>
   </toolbox>
 </tools>
 

This class is only designed for use as a request-scope tool.

Since:
VelocityTools 2.0
Version:
$Id: ContextTool.java 385122 2006-03-11 18:37:42Z nbubna $
Author:
Nathan Bubna

Field Summary
protected  org.apache.velocity.context.Context context
           
protected  Map<String,Object> toolbox
           
 
Fields inherited from class org.apache.velocity.tools.generic.SafeConfig
LOCK_CONFIG_KEY, OLD_LOCK_CONFIG_KEY, SAFE_MODE_KEY
 
Constructor Summary
ContextTool()
           
 
Method Summary
protected  void configure(ValueParser parser)
          Initializes this instance for the current request.
 boolean contains(Object refName)
          Returns true if the context contains a value for the specified reference name (aka context key).
protected  void fillKeyset(Set keys)
          Actually do the work of filling in the set of keys for getKeys() here so subclasses can add keys too.
 Object get(Object refName)
          Retrieves the value for the specified reference name (aka context key).
 Set getKeys()
          Return a Set of the available reference keys in the current context.
 org.apache.velocity.context.Context getThis()
          Returns the context being analyzed by this tool.
 Map<String,Object> getToolbox()
          Returns a read-only view of the toolbox Map for this context.
 Set getValues()
          Return a Set of the available values in the current context.
 
Methods inherited from class org.apache.velocity.tools.generic.SafeConfig
configure, isConfigLocked, isSafeMode, setLockConfig, setSafeMode
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

context

protected org.apache.velocity.context.Context context

toolbox

protected Map<String,Object> toolbox
Constructor Detail

ContextTool

public ContextTool()
Method Detail

configure

protected void configure(ValueParser parser)
Initializes this instance for the current request. Also looks for a safe-mode configuration setting. By default, safeMode is true and thus keys with '.' in them are hidden.

Overrides:
configure in class SafeConfig

getThis

public org.apache.velocity.context.Context getThis()
Returns the context being analyzed by this tool.


getToolbox

public Map<String,Object> getToolbox()

Returns a read-only view of the toolbox Map for this context.

Returns:
a map of all available tools for this request or null if such a map is not available

getKeys

public Set getKeys()

Return a Set of the available reference keys in the current context.


fillKeyset

protected void fillKeyset(Set keys)
Actually do the work of filling in the set of keys for getKeys() here so subclasses can add keys too.


getValues

public Set getValues()

Return a Set of the available values in the current context.


contains

public boolean contains(Object refName)

Returns true if the context contains a value for the specified reference name (aka context key).


get

public Object get(Object refName)
Retrieves the value for the specified reference name (aka context key).



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