org.picocontainer.parameters
Class ConstantParameter

java.lang.Object
  org.picocontainer.parameters.ConstantParameter

All Implemented Interfaces:

Serializable, Parameter

public class ConstantParameter
extends Object
implements Parameter, 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.

Author:

Jon Tirsén, Aslak Hellesøy, Jörg Schaible, Thomas Heller

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.picocontainer.Parameter

DEFAULT, ZERO

Constructor Summary

ConstantParameter(Object value)

Method Summary

void	accept(PicoVisitor visitor) Visit the current Parameter.
protected boolean	isAssignable(Type expectedType)
boolean	isResolvable(PicoContainer container, ComponentAdapter<?> adapter, Type expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding) Check if the Parameter can satisfy the expected type using the container.
Object	resolveInstance(PicoContainer container, ComponentAdapter<?> adapter, Type expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding) Retrieve the object from the Parameter that satisfies the expected type.
void	verify(PicoContainer container, ComponentAdapter<?> adapter, Type expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding) Verify that the Parameter can satisfy the expected type using the container

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantParameter

public ConstantParameter(Object value)

Method Detail

resolveInstance

public Object resolveInstance(PicoContainer container,
                              ComponentAdapter<?> adapter,
                              Type expectedType,
                              NameBinding expectedNameBinding,
                              boolean useNames,
                              Annotation binding)

Description copied from interface: Parameter

Retrieve the object from the Parameter that satisfies 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.

expectedNameBinding - Expected parameter name

Returns:

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

isResolvable

public boolean isResolvable(PicoContainer container,
                            ComponentAdapter<?> adapter,
                            Type expectedType,
                            NameBinding expectedNameBinding,
                            boolean useNames,
                            Annotation binding)

Description copied from interface: Parameter

Check if the Parameter can satisfy 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

expectedNameBinding - Expected parameter name

Returns:

true if the component parameter can be resolved.

verify

public void verify(PicoContainer container,
                   ComponentAdapter<?> adapter,
                   Type expectedType,
                   NameBinding expectedNameBinding,
                   boolean useNames,
                   Annotation binding)
            throws PicoException

Verify that the Parameter can satisfy 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

expectedNameBinding - Expected parameter name

Throws:

PicoCompositionException - if parameter and its dependencies cannot be resolved

PicoException

See Also:

Parameter.verify(org.picocontainer.PicoContainer,org.picocontainer.ComponentAdapter,java.lang.reflect.Type,org.picocontainer.NameBinding,boolean,java.lang.annotation.Annotation)

isAssignable

protected boolean isAssignable(Type expectedType)

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)