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java.lang.Objectorg.picocontainer.parameters.BasicComponentParameter
public class BasicComponentParameter
A BasicComponentParameter should be used to pass in a particular component as argument to a different component's constructor. This is particularly useful in cases where several components of the same type have been registered, but with a different key. Passing a ComponentParameter as a parameter when registering a component will give PicoContainer a hint about what other component to use in the constructor. This Parameter will never resolve against a collecting type, that is not directly registered in the PicoContainer itself.
Field Summary | |
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static BasicComponentParameter |
BASIC_DEFAULT
BASIC_DEFAULT is an instance of BasicComponentParameter using the default constructor. |
Fields inherited from interface org.picocontainer.Parameter |
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DEFAULT, ZERO |
Constructor Summary | |
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BasicComponentParameter()
Expect any parameter of the appropriate type. |
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BasicComponentParameter(Object componentKey)
Expect a parameter matching a component of a specific key. |
Method Summary | ||
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void |
accept(PicoVisitor visitor)
Visit the current Parameter . |
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boolean |
isResolvable(PicoContainer container,
ComponentAdapter adapter,
Class expectedType,
NameBinding expectedNameBinding,
boolean useNames,
Annotation binding)
Check whether the given Parameter can be satisfied by the container. |
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resolveInstance(PicoContainer container,
ComponentAdapter adapter,
Class<T> expectedType,
NameBinding expectedNameBinding,
boolean useNames,
Annotation binding)
Retrieve the object from the Parameter that satisfies the expected type. |
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void |
verify(PicoContainer container,
ComponentAdapter adapter,
Class 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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final BasicComponentParameter BASIC_DEFAULT
BASIC_DEFAULT
is an instance of BasicComponentParameter using the default constructor.
Constructor Detail |
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public BasicComponentParameter(Object componentKey)
componentKey
- the key of the desired addComponentpublic BasicComponentParameter()
Method Detail |
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public boolean isResolvable(PicoContainer container, ComponentAdapter adapter, Class expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding)
isResolvable
in interface Parameter
container
- the container from which dependencies are resolved.adapter
- the ComponentAdapter
that is asking for the instanceexpectedType
- the required typeexpectedNameBinding
- Expected parameter name
true
if the Parameter can be verified.
PicoCompositionException
Parameter.isResolvable(PicoContainer, ComponentAdapter, Class, NameBinding ,boolean, Annotation)
public <T> T resolveInstance(PicoContainer container, ComponentAdapter adapter, Class<T> expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding)
Parameter
resolveInstance
in interface Parameter
container
- the container from which dependencies are resolved.adapter
- the ComponentAdapter
that is asking for the instanceexpectedType
- the type that the returned instance needs to match.expectedNameBinding
- Expected parameter name
null
if no suitable instance can be found.public void verify(PicoContainer container, ComponentAdapter adapter, Class expectedType, NameBinding expectedNameBinding, boolean useNames, Annotation binding)
Parameter
verify
in interface Parameter
container
- the container from which dependencies are resolved.adapter
- the ComponentAdapter
that is asking for the verificationexpectedType
- the required typeexpectedNameBinding
- Expected parameter namepublic void accept(PicoVisitor visitor)
Parameter
.
accept
in interface Parameter
visitor
- the visitor.Parameter.accept(org.picocontainer.PicoVisitor)
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