Package org.camunda.bpm.engine.impl.el

Class ElValueProvider

java.lang.Object

org.camunda.bpm.engine.impl.el.ElValueProvider

All Implemented Interfaces:

Comparable<ElValueProvider>, ParameterValueProvider

public class ElValueProvider
extends Object
implements ParameterValueProvider, Comparable<ElValueProvider>

Makes it possible to use expression in IoParameter mappings.

Author:

Daniel Meyer

Field Summary

Fields

Modifier and Type	Field	Description
protected Expression	expression

Constructor Summary

Constructors

Constructor	Description
ElValueProvider(Expression expression)

Method Summary

Modifier and Type	Method	Description
int	compareTo(ElValueProvider o)
Expression	getExpression()
Object	getValue(VariableScope variableScope)
boolean	isDynamic()
void	setExpression(Expression expression)

Methods inherited from class java.lang.Object

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

Field Details

expression

protected Expression expression

Constructor Details

ElValueProvider

public ElValueProvider(Expression expression)

Method Details

getValue

public Object getValue(VariableScope variableScope)

Specified by:

getValue in interface ParameterValueProvider

Parameters:

variableScope - the scope in which the value is to be resolved.

Returns:

the value

getExpression

public Expression getExpression()

setExpression

public void setExpression(Expression expression)

compareTo

public int compareTo(ElValueProvider o)

Specified by:

compareTo in interface Comparable<ElValueProvider>

isDynamic

public boolean isDynamic()

Specified by:

isDynamic in interface ParameterValueProvider

Returns:

true if the value provider:

• Can return a different value depending on the passed variable scope
• May uses external data for its resolution
• May have side effects

If true, a caller of ParameterValueProvider.getValue(VariableScope) can assume that:

• passing an empty variable scope returns the same value as passing any other variable scope
• Calling ParameterValueProvider.getValue(VariableScope) multiple times always returns the same value
• Calling ParameterValueProvider.getValue(VariableScope) does not have side effects