gov.nasa.worldwind.render
Class AbstractSurfaceObject.SurfaceObjectStateKey

java.lang.Object
  gov.nasa.worldwind.render.AbstractSurfaceObject.SurfaceObjectStateKey

All Implemented Interfaces:

Cacheable

Direct Known Subclasses:

AbstractSurfaceShape.SurfaceShapeStateKey

Enclosing class:

AbstractSurfaceObject

protected static class AbstractSurfaceObject.SurfaceObjectStateKey
extends Object
implements Cacheable

Represents a surface object's current state. StateKey uniquely identifies a surface object's current state as follows:

• The StateKey class distinguishes the key from other object types.
• The object's unique ID distinguishes one surface object instances from another.
• The object's modified time distinguishes an object's internal state from any of its previous states.
Using the unique ID to distinguish between objects ensures that the StateKey does not store dangling references to the surface object itself. Should the StateKey live longer than the surface object that created it, the StateKey does not prevent the object from being garbage collected.

Field Summary

protected long	modifiedTime The SurfaceObject's modified time.
protected long	uniqueId The SurfaceObject's unique ID.

Constructor Summary

AbstractSurfaceObject.SurfaceObjectStateKey(long uniqueId, long modifiedTime)
Constructs a new SurfaceObjectStateKey with the specified unique ID and modified time.

Method Summary

boolean	equals(Object o)
long	getSizeInBytes() Returns the state key's size in bytes.
int	hashCode()

Methods inherited from class java.lang.Object

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

Field Detail

modifiedTime

protected final long modifiedTime

The SurfaceObject's modified time.

uniqueId

protected final long uniqueId

The SurfaceObject's unique ID. This is unique to all instances of SurfaceObject.

Constructor Detail

AbstractSurfaceObject.SurfaceObjectStateKey

public AbstractSurfaceObject.SurfaceObjectStateKey(long uniqueId,
                                                   long modifiedTime)

Constructs a new SurfaceObjectStateKey with the specified unique ID and modified time.

Parameters:

uniqueId - the SurfaceObject's unique ID.

modifiedTime - the SurfaceObject's modified time.

Method Detail

equals

public boolean equals(Object o)

Overrides:

equals in class Object

getSizeInBytes

public long getSizeInBytes()

Returns the state key's size in bytes.

Specified by:

getSizeInBytes in interface Cacheable

Returns:

the state key's size in bytes.

hashCode

public int hashCode()

Overrides:

hashCode in class Object