org.geotools.event
Class GTDeltaImpl

java.lang.Object
  org.geotools.event.GTDeltaImpl

All Implemented Interfaces:

GTDelta

public class GTDeltaImpl

extends java.lang.Object

implements GTDelta

Describes the extent of changes.

The "delta" acts as a series of bread crumbs allowing you the listener to figure out what changed where.

Since:

2.2.M3

Nested Class Summary

Nested classes inherited from class org.geotools.event.GTDelta

GTDelta.Kind

Field Summary

Fields inherited from interface org.geotools.event.GTDelta

NO_CHILDREN, NO_INDEX

Constructor Summary

GTDeltaImpl(GTNote notification, GTDelta.Kind kind, java.lang.Object value, java.lang.Object oldValue)
Create a delta, with no children.

GTDeltaImpl(GTNote notification, GTDelta.Kind kind, java.lang.Object value, java.lang.Object oldValue, GTDelta delta)
Create a delta with with a list element child delta.

GTDeltaImpl(GTNote notification, GTDelta.Kind kind, java.lang.Object value, java.lang.Object oldValue, java.util.List children)
Create a delta, completely specifying all values.

GTDeltaImpl(GTNote notification, java.lang.Object before, java.lang.Object after)
Does the right thing, aka magic.

Method Summary

void	accept(GTDeltaVisitor visitor) Accepts the given visitor.
java.util.List	getChildren() Finds and returns deltas for specificly changed constructs.
GTDelta.Kind	getKind() Returns the kind of this delta.
java.lang.String	getName() Name of property being affected.
java.lang.Object	getOldValue() Construct being replaced with a changed, getValue is the replacing value.
int	getPosition() Position in a "list" where the change occured, or NO_INDEX.
java.lang.Object	getValue() Affected construct, getKind & getChildern indicate specific details of the change.

Methods inherited from class java.lang.Object

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

Constructor Detail

GTDeltaImpl

public GTDeltaImpl(GTNote notification,
                   java.lang.Object before,
                   java.lang.Object after)

Does the right thing, aka magic.

This constructor is provided to make things easier, if your experience is not magic please skip this and try the next constructor.

Magic:

• NO_CHANGE: before == null after == null
• NO_CHANGE: before == after
• REMOVED: before == obj after == null
• ADDED: before == null after == obj
• CHANGED: before != after

Parameters:

notification -

before -

after -

GTDeltaImpl

public GTDeltaImpl(GTNote notification,
                   GTDelta.Kind kind,
                   java.lang.Object value,
                   java.lang.Object oldValue)

Create a delta, with no children.

Parameters:

notification -

kind -

value -

oldValue -

GTDeltaImpl

public GTDeltaImpl(GTNote notification,
                   GTDelta.Kind kind,
                   java.lang.Object value,
                   java.lang.Object oldValue,
                   GTDelta delta)

Create a delta with with a list element child delta.

This can be used to communicate a batch of changes, such as adding and removing sections from a list, or the results of a transformation.

Parameters:

notification -

kind -

value -

oldValue -

delta -

GTDeltaImpl

public GTDeltaImpl(GTNote notification,
                   GTDelta.Kind kind,
                   java.lang.Object value,
                   java.lang.Object oldValue,
                   java.util.List children)

Create a delta, completely specifying all values.

Parameters:

notification -

kind -

value -

oldValue -

children -

Method Detail

getName

public java.lang.String getName()

Description copied from interface: GTDelta

Name of property being affected.

• propertyName: "bean" property name when intergrating third party Java Beans into a more complex tree structure.
• List and Arrays: the name of the list, and may be combined with getPosition to indicate location, NO_INDEX would indicate the entire "list" has been modified.

Specified by:

getName in interface GTDelta

Returns:

name of affected Child, or null for root

getPosition

public int getPosition()

Description copied from interface: GTDelta

Position in a "list" where the change occured, or NO_INDEX.

Specified by:

getPosition in interface GTDelta

Returns:

Position in "list" or NO_INDEX.

getKind

public GTDelta.Kind getKind()

Description copied from interface: GTDelta

Returns the kind of this delta.

Normally, one of ADDED, REMOVED or CHANGED.

Specified by:

getKind in interface GTDelta

Returns:

the kind of this resource delta

See Also:

Kind.ADDED, Kind.REMOVED, Kind.CHANGED

getValue

public java.lang.Object getValue()

Description copied from interface: GTDelta

Affected construct, getKind & getChildern indicate specific details of the change.

Specified by:

getValue in interface GTDelta

Returns:

Affected construct

getOldValue

public java.lang.Object getOldValue()

Description copied from interface: GTDelta

Construct being replaced with a changed, getValue is the replacing value.

Specified by:

getOldValue in interface GTDelta

Returns:

Affected construct

getChildren

public java.util.List getChildren()

Description copied from interface: GTDelta

Finds and returns deltas for specificly changed constructs.

This code may be considered more accessable then the use of GTDeltaVisitor.

Specified by:

getChildren in interface GTDelta

Returns:

List of StyleDelta

accept

public void accept(GTDeltaVisitor visitor)

Description copied from interface: GTDelta

Accepts the given visitor.

Specified by:

accept in interface GTDelta

Parameters:

visitor -