Package org.apache.commons.jexl2
Interface JexlContext
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- All Known Implementing Classes:
MapContext
,ObjectContext
,ReadonlyContext
,UnifiedJEXL.TemplateContext
public interface JexlContext
Manages variables which can be referenced in a JEXL expression.Note that JEXL may use '$jexl' and '$ujexl' variables for internal purpose; setting or getting those variables may lead to unexpected results unless specified otherwise.
- Since:
- 1.0
- Version:
- $Id: JexlContext.java 1202769 2011-11-16 16:33:02Z henrib $
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.lang.Object
get(java.lang.String name)
Gets the value of a variable.boolean
has(java.lang.String name)
Checks whether a variable is defined in this context.void
set(java.lang.String name, java.lang.Object value)
Sets the value of a variable.
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Method Detail
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get
java.lang.Object get(java.lang.String name)
Gets the value of a variable.- Parameters:
name
- the variable's name- Returns:
- the value
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set
void set(java.lang.String name, java.lang.Object value)
Sets the value of a variable.- Parameters:
name
- the variable's namevalue
- the variable's value
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has
boolean has(java.lang.String name)
Checks whether a variable is defined in this context.A variable may be defined with a null value; this method checks whether the value is null or if the variable is undefined.
- Parameters:
name
- the variable's name- Returns:
- true if it exists, false otherwise
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