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An evaluation context is used to manage a set of objects needed during XML expression evaluation. A context has a parent context, can manage a set of named variables and has a default variable. The default variable is used during XML expression evaluation if no explicit variable is referenced.
This interface is not intended to be implemented by clients. Clients
are allowed to instantiate EvaluationContext
.
Method Summary | |
---|---|
void |
addVariable(String name,
Object value)
Adds a new named variable to this context. |
Object |
getDefaultVariable()
Returns the default variable. |
IEvaluationContext |
getParent()
Returns the parent context or null if
this is the root of the evaluation context hierarchy. |
IEvaluationContext |
getRoot()
Returns the root evaluation context. |
Object |
getVariable(String name)
Returns the variable managed under the given name. |
Object |
removeVariable(String name)
Removes the variable managed under the given name from this evaluation context. |
Object |
resolveVariable(String name,
Object[] args)
Resolves a variable for the given name and arguments. |
Method Detail |
public IEvaluationContext getParent()
null
if
this is the root of the evaluation context hierarchy.
null
public IEvaluationContext getRoot()
public Object getDefaultVariable()
null
if
no default variable is managed.public void addVariable(String name, Object value)
name
- the variable's namevalue
- the variable's valuepublic Object removeVariable(String name)
name
- the variable's name
null
if
the variable doesn't existpublic Object getVariable(String name)
name
- the variable's name
null
if the content
doesn't manage a variable with the given namepublic Object resolveVariable(String name, Object[] args) throws CoreException
resolve
expression.
name
- the variable to resolveargs
- an object array of arguments used to resolve the
variable
null
if no variable
can be resolved for the given name and arguments
CoreException
- if an errors occurs while resolving
the variable
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Guidelines for using Eclipse APIs.
Copyright (c) IBM Corp. and others 2000, 2005. All rights reserved.