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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » javax.media.jai

Source Cross Reference Class Diagram Java Document (Java Doc)

javax.media.jai .DeferredData

javax.media.jai .DeferredProperty

DeferredProperty
public class DeferredProperty extends DeferredData implements PropertyChangeListener(Code)
	A subclass of `DeferredData` to be used to wrap JAI property values which will be computed at a later time. For example, an instance of this class could be used to wrap a property emitted by an operation node so that the actual computation of the property value was deferred until it was actually needed. See Also: DeferredData See Also: RenderedOp since: JAI 1.1

Field Summary
protected String	propertyName The name of the property the value of which is to be obtained.
protected transient PropertySource	propertySource The `PropertySource` from which the value of the named property is to be drawn.

Constructor Summary
public	DeferredProperty(PropertySource propertySource, String propertyName, Class propertyClass) Creates a `DeferredProperty`.

Method Summary
protected Object	computeData() Returns the value of the image property associated with the image and property name specified at construction.
public boolean	equals(Object obj) Tests whether the parameter equals this object.
public String	getPropertyName() Returns the name of the property the value of which is to be obtained.
public PropertySource	getPropertySource() Returns the `PropertySource` of the property value.
public int	hashCode() Returns a hash code value for the object.
public void	propertyChange(PropertyChangeEvent evt) The implementation of `PropertyChangeListener`.

Field Detail

propertyName
protected String propertyName(Code)
	The name of the property the value of which is to be obtained.

propertySource
protected transient PropertySource propertySource(Code)
	The `PropertySource` from which the value of the named property is to be drawn.

Constructor Detail

DeferredProperty
public DeferredProperty(PropertySource propertySource, String propertyName, Class propertyClass)(Code)
	Creates a `DeferredProperty`. If the specified `PropertySource` is a `PropertyChangeEmitter`, then this `DeferredProperty` object is registered as a `PropertyChangeListener` of the `PropertySource`. exception: IllegalArgumentException - if a parameter is `null`or if the `propertyName` is not among thoseemitted by the `PropertySource`.

Method Detail

computeData
protected Object computeData()(Code)
	Returns the value of the image property associated with the image and property name specified at construction.

equals
public boolean equals(Object obj)(Code)
	Tests whether the parameter equals this object. Equality obtains if the parameter object is a `DeferredProperty` and the respective `propertySource` and `dataClass` variables are equal according to their respective `equals()` methods and the `propertyName`s are equal ignoring case. The wrapped data object is not tested unless the `isValid()` of both objects returns `true` because requesting it via `getData()` may provoke computation of a deferred quantity.

getPropertyName
public String getPropertyName()(Code)
	Returns the name of the property the value of which is to be obtained.

getPropertySource
public PropertySource getPropertySource()(Code)
	Returns the `PropertySource` of the property value.

hashCode
public int hashCode()(Code)
	Returns a hash code value for the object.

propertyChange

public void propertyChange(PropertyChangeEvent evt)(Code)

The implementation of PropertyChangeListener. This method responds to certain PropertyChangeEvents generated by the PropertySource used to construct this object.

If the PropertyChangeEvent is named "Rendering" and is an instance of javax.media.jai.RenderingChangeEvent, then the source of the event is checked to determine whether it equals the PropertySource used to construct this object. If this test is passed then the PropertySource is a RenderedOp the rendering of which has changed. Therefore setData() will be invoked with a null argument. This will indicate to any registered observers that the property data should be re-requested by invoking getData() on this object.

If the PropertyChangeEvent was generated by the PropertySource used to construct this object, has name equal to the name of the deferred property, and is an instance of PropertySourceChangeEvent, then the value returned by the getNewValue() method of the event object will be passed to setData() unless getNewValue() returns java.awt.Image.UndefinedProperty in which case null will be passed to setData(). Registered observers will be notified according to the specification of setData().

Fields inherited from javax.media.jai.DeferredData

protected transient Object data(Code)(Java Doc)
protected Class dataClass(Code)(Java Doc)

Methods inherited from javax.media.jai.DeferredData

abstract protected Object computeData()(Code)(Java Doc)
final public synchronized Object getData()(Code)(Java Doc)
public Class getDataClass()(Code)(Java Doc)
public boolean isValid()(Code)(Java Doc)
final protected void setData(Object data)(Code)(Java Doc)

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