Package org.picocontainer.injectors
Class MethodInjector<T>
java.lang.Object
org.picocontainer.adapters.AbstractAdapter<T>
org.picocontainer.injectors.AbstractInjector<T>
org.picocontainer.injectors.SingleMemberInjector<T>
org.picocontainer.injectors.MethodInjector<T>
- All Implemented Interfaces:
Serializable
,ComponentAdapter<T>
,ComponentMonitorStrategy
,Injector<T>
- Direct Known Subclasses:
MethodInjector.ByMethodName
,MethodInjector.ByReflectionMethod
Injection will happen through a single method for the component.
Most likely it is a method called 'inject', though that can be overridden.
- Author:
- Paul Hammant, Aslak Hellesøy, Jon Tirsén, Zohar Melamed, Jörg Schaible, Mauro Talevi
- See Also:
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
static class
Nested classes/interfaces inherited from class org.picocontainer.injectors.SingleMemberInjector
SingleMemberInjector.ParameterCannotBeNullException
Nested classes/interfaces inherited from class org.picocontainer.injectors.AbstractInjector
AbstractInjector.AmbiguousComponentResolutionException, AbstractInjector.CyclicDependencyException, AbstractInjector.NotConcreteRegistrationException, AbstractInjector.UnsatisfiableDependenciesException
Nested classes/interfaces inherited from interface org.picocontainer.ComponentAdapter
ComponentAdapter.NOTHING
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Field Summary
Fields inherited from class org.picocontainer.injectors.AbstractInjector
parameters, verifyingGuard
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Constructor Summary
ConstructorsConstructorDescriptionMethodInjector
(Object componentKey, Class componentImplementation, Parameter[] parameters, ComponentMonitor monitor, String methodName, boolean useNames) Creates a MethodInjector -
Method Summary
Modifier and TypeMethodDescriptiondecorateComponentInstance
(PicoContainer container, Type into, T instance) A preexiting component instance can be injected into after instantiationgetComponentInstance
(PicoContainer container, Type into) Retrieve the component instance.protected abstract Method
protected Object[]
getMemberArguments
(PicoContainer container, Method method) protected boolean
isNullParamAllowed
(AccessibleObject member, int i) Checks to see if a null parameter is allowed in the given constructor/field/method.void
verify
(PicoContainer container) Verify that all dependencies for this adapter can be satisfied.Methods inherited from class org.picocontainer.injectors.SingleMemberInjector
boxParameters, getBindings, getMemberArguments, getParameter, getParanamer, nullCheck
Methods inherited from class org.picocontainer.injectors.AbstractInjector
accept, box, caughtIllegalAccessException, caughtIllegalAccessException, caughtInstantiationException, caughtInvocationTargetException, createDefaultParameters, getComponentInstance, getDescriptor, newInstance, useNames
Methods inherited from class org.picocontainer.adapters.AbstractAdapter
changeMonitor, checkTypeCompatibility, currentMonitor, findAdapterOfType, getComponentImplementation, getComponentKey, getDelegate, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.picocontainer.ComponentAdapter
findAdapterOfType, getComponentImplementation, getComponentKey, getDelegate
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Constructor Details
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MethodInjector
public MethodInjector(Object componentKey, Class componentImplementation, Parameter[] parameters, ComponentMonitor monitor, String methodName, boolean useNames) throws AbstractInjector.NotConcreteRegistrationException Creates a MethodInjector- Parameters:
componentKey
- the search key for this implementationcomponentImplementation
- the concrete implementationparameters
- the parameters to use for the initializationmonitor
- the component monitor used by this addAdaptermethodName
- the method nameuseNames
- use argument names when looking up dependencies- Throws:
AbstractInjector.NotConcreteRegistrationException
- if the implementation is not a concrete class.NullPointerException
- if one of the parameters isnull
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Method Details
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getInjectorMethod
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getComponentInstance
Description copied from interface:ComponentAdapter
Retrieve the component instance. This method will usually create a new instance each time it is called, but that is not required. For example,Cached
will always return the same instance.- Specified by:
getComponentInstance
in interfaceComponentAdapter<T>
- Specified by:
getComponentInstance
in classAbstractInjector<T>
- Parameters:
container
- thePicoContainer
, that is used to resolve any possible dependencies of the instance.into
- the class that is about to be injected into. Use ComponentAdapter.NOTHING.class if this is not important to you.- Returns:
- the component instance.
- Throws:
PicoCompositionException
- if the component has dependencies which could not be resolved, or instantiation of the component lead to an ambiguous situation within the container.
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getMemberArguments
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decorateComponentInstance
Description copied from interface:Injector
A preexiting component instance can be injected into after instantiation- Specified by:
decorateComponentInstance
in interfaceInjector<T>
- Overrides:
decorateComponentInstance
in classAbstractInjector<T>
- Parameters:
container
- the container that can provide injectable dependenciesinto
-instance
- the instance to- Returns:
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verify
Description copied from interface:ComponentAdapter
Verify that all dependencies for this adapter can be satisfied. Normally, the adapter should verify this by checking that the associated PicoContainer contains all the needed dependencies.- Specified by:
verify
in interfaceComponentAdapter<T>
- Overrides:
verify
in classAbstractInjector<T>
- Parameters:
container
- thePicoContainer
, that is used to resolve any possible dependencies of the instance.- Throws:
PicoCompositionException
- if one or more dependencies cannot be resolved.
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isNullParamAllowed
Description copied from class:SingleMemberInjector
Checks to see if a null parameter is allowed in the given constructor/field/method. The default version allows null if the target object is not a primitive type.- Overrides:
isNullParamAllowed
in classSingleMemberInjector<T>
- Parameters:
member
- constructor method or fieldi
- parameter #.- Returns:
- true if the null parameter might be allowed.
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