org.eclipse.incquery.runtime.matchers.planning.helpers

Class FunctionalDependencyHelper

java.lang.Object

org.eclipse.incquery.runtime.matchers.planning.helpers.FunctionalDependencyHelper

public class FunctionalDependencyHelper
extends java.lang.Object

Helper utility class for functional dependency analysis. Throughout this class attribute sets are represented as generic sets and functional dependencies as maps from attribute set (generic sets) to attribute set (generic sets)

Author:

Adam Dudas

Constructor Summary

Constructors

Constructor and Description
FunctionalDependencyHelper()

Method Summary

Modifier and Type	Method and Description
static <A> java.util.Set<A>	closureOf(java.util.Collection<A> attributes, java.util.Map<java.util.Set<A>,java.util.Set<A>> dependencies) Get the closure of the specified attribute set relative to the specified functional dependencies.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionalDependencyHelper

public FunctionalDependencyHelper()

Method Detail

closureOf

public static <A> java.util.Set<A> closureOf(java.util.Collection<A> attributes,
                                             java.util.Map<java.util.Set<A>,java.util.Set<A>> dependencies)

Get the closure of the specified attribute set relative to the specified functional dependencies.

Parameters:

attributes - The attributes to get the closure of.

dependencies - The functional dependencies of which the closure operation is relative to.

Returns:

The closure of the specified attribute set relative to the specified functional dependencies.