org.picocontainer.defaults

Class ConstantParameter

java.lang.Object

org.picocontainer.defaults.ConstantParameter

All Implemented Interfaces:

java.io.Serializable, Parameter

public class ConstantParameter
extends java.lang.Object
implements Parameter, java.io.Serializable

A ConstantParameter should be used to pass in "constant" arguments to constructors. This includes Strings,Integers or any other object that is not registered in the container.

Version:

$Revision: 3132 $

Author:

Jon Tirsén, Aslak Hellesøy, Jörg Schaible, Thomas Heller

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.Object	value

Constructor Summary

Constructors

Constructor and Description
ConstantParameter(java.lang.Object value)

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(PicoVisitor visitor) Visit the current Parameter.
private boolean	checkPrimitive(java.lang.Class expectedType)
boolean	isResolvable(PicoContainer container, ComponentAdapter adapter, java.lang.Class expectedType) Check if the Parameter can statisfy the expected type using the container.
java.lang.Object	resolveInstance(PicoContainer container, ComponentAdapter adapter, java.lang.Class expectedType) Retrieve the object from the Parameter that statisfies the expected type.
void	verify(PicoContainer container, ComponentAdapter adapter, java.lang.Class expectedType) Verify that the Parameter can statisfied the expected type using the container

Methods inherited from class java.lang.Object

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

Field Detail

value

private final java.lang.Object value

Constructor Detail

ConstantParameter

public ConstantParameter(java.lang.Object value)

Method Detail

resolveInstance

public java.lang.Object resolveInstance(PicoContainer container,
                               ComponentAdapter adapter,
                               java.lang.Class expectedType)

Description copied from interface: Parameter

Retrieve the object from the Parameter that statisfies the expected type.

Specified by:

resolveInstance in interface Parameter

Parameters:

container - the container from which dependencies are resolved.

adapter - the ComponentAdapter that is asking for the instance

expectedType - the type that the returned instance needs to match.

Returns:

the instance or null if no suitable instance can be found.

isResolvable

public boolean isResolvable(PicoContainer container,
                   ComponentAdapter adapter,
                   java.lang.Class expectedType)

Description copied from interface: Parameter

Check if the Parameter can statisfy the expected type using the container.

Specified by:

isResolvable in interface Parameter

Parameters:

container - the container from which dependencies are resolved.

adapter - the ComponentAdapter that is asking for the instance

expectedType - the required type

Returns:

true if the component parameter can be resolved.

verify

public void verify(PicoContainer container,
          ComponentAdapter adapter,
          java.lang.Class expectedType)
            throws PicoException

Verify that the Parameter can statisfied the expected type using the container

Specified by:

verify in interface Parameter

Parameters:

container - the container from which dependencies are resolved.

adapter - the ComponentAdapter that is asking for the verification

expectedType - the required type

Throws:

PicoIntrospectionException - if parameter and its dependencies cannot be resolved

PicoException

See Also:

Parameter.verify(org.picocontainer.PicoContainer, org.picocontainer.ComponentAdapter, java.lang.Class)

accept

public void accept(PicoVisitor visitor)

Visit the current Parameter.

Specified by:

accept in interface Parameter

Parameters:

visitor - the visitor.

See Also:

Parameter.accept(org.picocontainer.PicoVisitor)

checkPrimitive

private boolean checkPrimitive(java.lang.Class expectedType)