orc.trace
Class WeakBackwardEventCursor

java.lang.Object
  orc.trace.WeakBackwardEventCursor

All Implemented Interfaces:

EventCursor

public class WeakBackwardEventCursor
extends java.lang.Object
implements EventCursor

Wrap a cursor to provide weak back references. This means you can only traverse back to the earliest cursor for which you hold a reference externally.

Author:

quark

Nested Class Summary

Nested classes/interfaces inherited from interface orc.trace.EventCursor

EventCursor.EndOfStream

Constructor Summary

WeakBackwardEventCursor(EventCursor cursor)

Method Summary

WeakBackwardEventCursor	backward() Return a cursor to the previous event in the stream.
Event	current() Return the current event in the stream.
WeakBackwardEventCursor	forward() Return a cursor to the next event in the stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakBackwardEventCursor

public WeakBackwardEventCursor(EventCursor cursor)

Method Detail

current

public Event current()

Description copied from interface: EventCursor

Return the current event in the stream.

Specified by:

current in interface EventCursor

forward

public WeakBackwardEventCursor forward()
                                throws EventCursor.EndOfStream

Description copied from interface: EventCursor

Return a cursor to the next event in the stream. Why "forward" instead of "next"? To avoid confusion with the temporal logic "next" operator which evaluates a predicate at the next location. Also because I prefer the symmetry of forward/backward to next/previous.

Specified by:

forward in interface EventCursor

Throws:

EventCursor.EndOfStream

backward

public WeakBackwardEventCursor backward()
                                 throws EventCursor.EndOfStream

Description copied from interface: EventCursor

Return a cursor to the previous event in the stream.

Specified by:

backward in interface EventCursor

Throws:

EventCursor.EndOfStream