bboss.org.apache.velocity.runtime.directive

类 Foreach.NullHolderContext

java.lang.Object

bboss.org.apache.velocity.context.ChainedInternalContextAdapter

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

所有已实现的接口:

Context, InternalContextAdapter, InternalEventContext, InternalWrapperContext

封闭类:

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.

从以下版本开始:

1.5

字段概要

从类继承的字段 bboss.org.apache.velocity.context.ChainedInternalContextAdapter

innerContext

方法概要

限定符和类型	方法和说明
java.lang.Object	get(java.lang.String key) Get an object from the context, or null if the key is equal to the loop variable
java.lang.Object	localPut(java.lang.String key, java.lang.Object value) Allows callers to explicitly put objects in the local context.
java.lang.Object	put(java.lang.String key, java.lang.Object value) Put method also stores values in parent context
java.lang.Object	remove(java.lang.Object key) Remove an object from the context

从类继承的方法 bboss.org.apache.velocity.context.ChainedInternalContextAdapter

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

从类继承的方法 java.lang.Object

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

方法详细资料

get

public java.lang.Object get(java.lang.String key)
                     throws MethodInvocationException

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

指定者:

get 在接口中 Context

覆盖:

get 在类中 ChainedInternalContextAdapter

参数:

key - name of item to get

返回:

stored object or null

抛出:

MethodInvocationException - passes on potential exception from reference method call

另请参阅:

Context.get(java.lang.String)

put

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

从类复制的说明: ChainedInternalContextAdapter

Put method also stores values in parent context

指定者:

put 在接口中 Context

覆盖:

put 在类中 ChainedInternalContextAdapter

参数:

key - name of item to set

value - object to set to key

返回:

old stored object

另请参阅:

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

localPut

public java.lang.Object localPut(java.lang.String key,
                                 java.lang.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.

指定者:

localPut 在接口中 InternalWrapperContext

覆盖:

localPut 在类中 ChainedInternalContextAdapter

参数:

key - name of item to set.

value - object to set to key.

返回:

old stored object

另请参阅:

InternalWrapperContext.localPut(String, Object)

remove

public java.lang.Object remove(java.lang.Object key)

Remove an object from the context

指定者:

remove 在接口中 Context

覆盖:

remove 在类中 ChainedInternalContextAdapter

参数:

key - The name of the value to remove.

返回:

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

另请参阅:

Context.remove(java.lang.Object key)