de.grogra.xl.impl.queues
Class QueueDescriptor<Q extends Queue>

java.lang.Object
  de.grogra.xl.impl.queues.QueueDescriptor<Q>

Direct Known Subclasses:

GraphQueue.AddEdgeDescriptor, GraphQueue.AddNodeDescriptor, GraphQueue.AddUndirectedEdgeDescriptor, GraphQueue.ConnectDescriptor, GraphQueue.DeleteEdgeDescriptor, GraphQueue.DeleteNodeDescriptor, GraphQueue.ExecuteDescriptor, PropertyQueue.MakePersistentDescriptor, PropertyQueue.PropertyQueueDescriptor, VVQueue.Descriptor

public abstract class QueueDescriptor<Q extends Queue>
extends java.lang.Object

A QueueDescriptor is a handle to the method QueueCollection.getQueue(QueueDescriptor), there it is used to instantiate a queue by createQueue(QueueCollection). In addition, a QueueDescriptor describes the order processing of queues (see QueueCollection.process(int[])) by its methods queuesToProcessBefore() and queuesToProcessAfter(). The methods equals and hashCode are overriden such that two descriptors are equal iff their classes are equal.

Author:

Ole Kniemeyer

Field Summary

static QueueDescriptor[]

DESCRIPTOR_0 Immutable QueueDescriptor array of length 0.

Constructor Summary

QueueDescriptor()

Method Summary

static void	addOrder(java.util.List<? super QueueDescriptor<?>> queueOrder)
abstract Q	createQueue(QueueCollection qc) Creates a new Queue.
boolean	equals(java.lang.Object o)
int	hashCode()
protected abstract QueueDescriptor[]	queuesToProcessAfter() Returns the descriptors of queues which are to be applied after the queue of this descriptor.
protected abstract QueueDescriptor[]	queuesToProcessBefore() Returns the descriptors of queues which are to be applied before the queue of this descriptor.

Methods inherited from class java.lang.Object

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

Field Detail

DESCRIPTOR_0

public static final QueueDescriptor[] DESCRIPTOR_0

Immutable QueueDescriptor array of length 0.

Constructor Detail

QueueDescriptor

public QueueDescriptor()

Method Detail

addOrder

public static void addOrder(java.util.List<? super QueueDescriptor<?>> queueOrder)

createQueue

public abstract Q createQueue(QueueCollection qc)

Creates a new Queue. This method is invoked by QueueCollection.getQueue(QueueDescriptor).

Parameters:

qc - the invoking QueueCollection

Returns:

a new Queue instance corresponding to this descriptor

equals

public final boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

queuesToProcessAfter

protected abstract QueueDescriptor[] queuesToProcessAfter()

Returns the descriptors of queues which are to be applied after the queue of this descriptor.

Returns:

descriptors of queues to be applied after this descriptor's queue

See Also:

QueueCollection.process(int[])

queuesToProcessBefore

protected abstract QueueDescriptor[] queuesToProcessBefore()

Returns the descriptors of queues which are to be applied before the queue of this descriptor.

Returns:

descriptors of queues to be applied before this descriptor's queue

See Also:

QueueCollection.process(int[])