com.sdm.quasar.client.core.data.structure
Interface Computation

All Known Implementing Classes:

AbstractSimpleComputation, ContextNodeComputation

public interface Computation

Defines a computation used within a ComputedNode. If you want to implement a computation that does not need a context you should use AbstractSimpleComputation as base class.

Version:

1.0

Author:

Thomas Wolf, sd&m AG, Bernd Olleck, sd&m AG

Method Summary

java.util.Set	computeIndexSet(ComputationValueAccess sourceValuesAccess, Context context) Performs the computation of a Set of the index values.
java.lang.Object	computeValue(ComputationValueAccess sourceValuesAccess, Context context) Performs the computation with an context.
java.lang.Class[]	getSourceTypes()
java.lang.Class	getType()
void	reverseValueComputation(java.lang.Object targetValue, ComputationValueAccess sourceValuesAccess, Context context) Perform a reverse computation computes the correct source values with respect to the target value with a context.
boolean	supportsReverse()

Method Detail

getType

public java.lang.Class getType()

Returns:

the type of the result that this computation produces

getSourceTypes

public java.lang.Class[] getSourceTypes()

Returns:

the types of the source values that this compuatation expects

computeValue

public java.lang.Object computeValue(ComputationValueAccess sourceValuesAccess,
                                     Context context)

Performs the computation with an context.

Parameters:

sourceValuesAccess - the access source values

context - the context to be used

Returns:

the result

computeIndexSet

public java.util.Set computeIndexSet(ComputationValueAccess sourceValuesAccess,
                                     Context context)

Performs the computation of a Set of the index values. The method returns null for not indexed nodes.

Parameters:

sourceValuesAccess - the access source values

context - the context to be used

Returns:

a Set of the index values or null

supportsReverse

public boolean supportsReverse()

Returns:

true iff the computation supports a reverse computation

reverseValueComputation

public void reverseValueComputation(java.lang.Object targetValue,
                                    ComputationValueAccess sourceValuesAccess,
                                    Context context)

Perform a reverse computation computes the correct source values with respect to the target value with a context. The resulting new source values must be set using the ComputationValueAccess.

Parameters:

targetValue - the target value

sourceValuesAccess - the access current source values

context - the context to be used