Package org.camunda.bpm.engine.impl.core.variable.mapping.value

Class NullValueProvider

java.lang.Object

org.camunda.bpm.engine.impl.core.variable.mapping.value.NullValueProvider

All Implemented Interfaces:

ParameterValueProvider

public class NullValueProvider
extends Object
implements ParameterValueProvider

Author:

Daniel Meyer

Constructor Summary

Constructors

Constructor	Description
NullValueProvider()

Method Summary

Modifier and Type	Method	Description
Object	getValue(VariableScope variableScope)
boolean	isDynamic()

Methods inherited from class java.lang.Object

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

Constructor Details

NullValueProvider

public NullValueProvider()

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

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