org.apache.tapestry5.internal.bindings
Class AbstractBinding

java.lang.Object
  org.apache.tapestry5.ioc.BaseLocatable
      org.apache.tapestry5.internal.bindings.AbstractBinding

All Implemented Interfaces:

Binding, AnnotationProvider, Locatable

Direct Known Subclasses:

AssetBinding, AttributeExpansionBinding, BlockBinding, ComponentBinding, InvariantBinding, LiteralBinding, PropBinding, RenderVariableBinding

public abstract class AbstractBinding
extends BaseLocatable
implements Binding

Abstract base class for bindings. Assumes that the binding is read only and invariant. Subclasses must provide an implementation of Binding.get().

Constructor Summary

	AbstractBinding()
protected	AbstractBinding(Location location)

Method Summary

<T extends Annotation> T	getAnnotation(Class<T> annotationClass) Always returns null.
Class	getBindingType() Returns the actual class, by invoking Binding.get().
boolean	isInvariant() Returns true.
void	set(Object value) Updates the current value.

Methods inherited from class org.apache.tapestry5.ioc.BaseLocatable

getLocation

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.tapestry5.Binding

get

Constructor Detail

AbstractBinding

public AbstractBinding()

AbstractBinding

protected AbstractBinding(Location location)

Method Detail

set

public void set(Object value)

Description copied from interface: Binding

Updates the current value. Most types of bindings are read-only, and this method will throw a runtime exception. It is the caller's responsibility to ensure that the value passed in is of the appropriate type.

Specified by:

set in interface Binding

Throws:

TapestryException - always

isInvariant

public boolean isInvariant()

Returns true. Subclasses that do not supply a fixed, read-only value should override this method to return false.

Specified by:

isInvariant in interface Binding

getBindingType

public Class getBindingType()

Returns the actual class, by invoking Binding.get(). Subclasses may override this method to work more efficiently (say, when the binding type is known statically).

Specified by:

getBindingType in interface Binding

getAnnotation

public <T extends Annotation> T getAnnotation(Class<T> annotationClass)

Always returns null. Bindings that provide access to a method or field will override this method to return the appropriate annotation.

Specified by:

getAnnotation in interface AnnotationProvider

Parameters:

annotationClass - used to select the annotation to return

Returns:

the annotation, or null if not found