org.apache.velocity.runtime.directive
Class Foreach.NullHolderContext

java.lang.Object
  org.apache.velocity.context.ChainedInternalContextAdapter
      org.apache.velocity.runtime.directive.Foreach.NullHolderContext

All Implemented Interfaces:

Context, InternalContextAdapter, InternalEventContext, InternalWrapperContext

Enclosing class:

Foreach

protected static class Foreach.NullHolderContext
extends ChainedInternalContextAdapter

A special context to use when the foreach iterator returns a null. This is required since the standard context may not support nulls. All puts and gets are passed through, except for the foreach iterator key.

Since:

1.5

Field Summary

Fields inherited from class org.apache.velocity.context.ChainedInternalContextAdapter

innerContext

Method Summary

Object	get(String key) Get an object from the context, or null if the key is equal to the loop variable
Object	localPut(String key, Object value) Allows callers to explicitly put objects in the local context.
Object	put(String key, Object value) Put method also stores values in parent context
Object	remove(Object key) Remove an object from the context

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

attachEventCartridge, containsKey, getAllowRendering, getBaseContext, getCurrentMacroCallDepth, getCurrentMacroName, getCurrentResource, getCurrentTemplateName, getEventCartridge, getInternalUserContext, getKeys, getMacroLibraries, getMacroNameStack, getTemplateNameStack, icacheGet, icachePut, popCurrentMacroName, popCurrentTemplateName, pushCurrentMacroName, pushCurrentTemplateName, setAllowRendering, setCurrentResource, setMacroLibraries

Methods inherited from class java.lang.Object

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

Method Detail

get

public Object get(String key)
           throws MethodInvocationException

Get an object from the context, or null if the key is equal to the loop variable

Specified by:

get in interface Context

Overrides:

get in class ChainedInternalContextAdapter

Parameters:

key - name of item to get

Returns:

stored object or null

Throws:

MethodInvocationException - passes on potential exception from reference method call

See Also:

Context.get(java.lang.String)

put

public Object put(String key,
                  Object value)

Description copied from class: ChainedInternalContextAdapter

Put method also stores values in parent context

Specified by:

put in interface Context

Overrides:

put in class ChainedInternalContextAdapter

Parameters:

key - name of item to set

value - object to set to key

Returns:

old stored object

See Also:

Context.put(java.lang.String key, java.lang.Object value)

localPut

public Object localPut(String key,
                       Object value)

Allows callers to explicitly put objects in the local context. Objects added to the context through this method always end up in the top-level context of possible wrapped contexts.

Specified by:

localPut in interface InternalWrapperContext

Overrides:

localPut in class ChainedInternalContextAdapter

Parameters:

key - name of item to set.

value - object to set to key.

Returns:

old stored object

See Also:

InternalWrapperContext.localPut(String, Object)

remove

public Object remove(Object key)

Remove an object from the context

Specified by:

remove in interface Context

Overrides:

remove in class ChainedInternalContextAdapter

Parameters:

key - The name of the value to remove.

Returns:

The value that the key was mapped to, or null if unmapped.

See Also:

Context.remove(java.lang.Object key)