org.gvsig.fmap.mapcontext

Class ExtentHistory

java.lang.Object

org.gvsig.fmap.mapcontext.ExtentHistory

All Implemented Interfaces:

org.gvsig.tools.persistence.Persistent

public class ExtentHistory
extends java.lang.Object
implements org.gvsig.tools.persistence.Persistent

ExtentHistory is designed for managing a history of extents.

Note: An extent is a re.setMandatory(true)ctangular area, with information of its top-left 2D corner.

Author:

Vicente Caballero Navarro

Constructor Summary

Constructors

Constructor and Description
ExtentHistory() Creates a new instance of ExtentsHistory with an history of 10 extents.
ExtentHistory(int numEntries) Creates a new instance of ExtentsHistory with an history of numEntries extents.

Method Summary

Methods

Modifier and Type	Method and Description
java.awt.geom.Rectangle2D	get() Returns the last extent in the history.
boolean	hasPrevious() Returns true if there are extents registered.
void	loadFromState(org.gvsig.tools.persistence.PersistentState state)
void	put(java.awt.geom.Rectangle2D ext) Appends the specified extent to the end of this history.
static void	registerPersistent()
java.awt.geom.Rectangle2D	removePrev() Extracts (removing) the last extent from the history.
void	saveToState(org.gvsig.tools.persistence.PersistentState state) Returns information of this object.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtentHistory

public ExtentHistory()

Creates a new instance of ExtentsHistory with an history of 10 extents.

ExtentHistory

public ExtentHistory(int numEntries)

Creates a new instance of ExtentsHistory with an history of numEntries extents.

Parameters:

numEntries - the maximum number of extents that will store the instance

Method Detail

get

public java.awt.geom.Rectangle2D get()

Returns the last extent in the history.

Returns:

the last extent in the history

See Also:

put(Rectangle2D), #getXMLEntity()

hasPrevious

public boolean hasPrevious()

Returns true if there are extents registered.

Returns:

true if there are extents registered; false otherwise

See Also:

put(Rectangle2D), removePrev(), get()

loadFromState

public void loadFromState(org.gvsig.tools.persistence.PersistentState state)
                   throws org.gvsig.tools.persistence.exception.PersistenceException

Specified by:

loadFromState in interface org.gvsig.tools.persistence.Persistent

Throws:

org.gvsig.tools.persistence.exception.PersistenceException

put

public void put(java.awt.geom.Rectangle2D ext)

Appends the specified extent to the end of this history.

Parameters:

ext - the new extent

See Also:

get(), hasPrevious()

registerPersistent

public static void registerPersistent()

removePrev

public java.awt.geom.Rectangle2D removePrev()

Extracts (removing) the last extent from the history.

Returns:

last extent in the history

See Also:

hasPrevious()

saveToState

public void saveToState(org.gvsig.tools.persistence.PersistentState state)
                 throws org.gvsig.tools.persistence.exception.PersistenceException

Returns information of this object. All information is stored as properties:

Properties:

• className: name of this class.
• num: number of extents registered.
• numrec: maximum number of extents that can register.
• extents: .

Specified by:

saveToState in interface org.gvsig.tools.persistence.Persistent

Throws:

org.gvsig.tools.persistence.exception.PersistenceException