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## org.picocontainer.adapters
Class AbstractAdapter<T>

    java.lang.Object
      org.picocontainer.adapters.AbstractAdapter<T>

All Implemented Interfaces:
  Serializable, ComponentAdapter<T>, ComponentMonitorStrategy

Direct Known Subclasses:
  AbstractInjector, DefaultPicoContainer.LateInstance, InstanceAdapter

    public abstract class AbstractAdapter<T>

extends Object
implements ComponentAdapter<T>, ComponentMonitorStrategy, Serializable

Base class for a ComponentAdapter with general functionality. This implementation provides basic checks for a healthy implementation of a ComponentAdapter. It does not allow to use `null` for the component key or the implementation, ensures that the implementation is a concrete class and that the key is assignable from the implementation if the key represents a type.

Author:
  Paul Hammant, Aslak Hellesøy, Jon Tirsén
See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.picocontainer.ComponentAdapter
`ComponentAdapter.NOTHING`

Constructor Summary
`AbstractAdapter(Object componentKey, Class componentImplementation)` Constructs a new ComponentAdapter for the given key and implementation.
`AbstractAdapter(Object componentKey, Class componentImplementation, ComponentMonitor monitor)` Constructs a new ComponentAdapter for the given key and implementation.

Method Summary
`void` | `accept(PicoVisitor visitor)` Accepts a visitor for this ComponentAdapter.
`void` | `changeMonitor(ComponentMonitor monitor)` Changes the component monitor used
`protected void` | `checkTypeCompatibility()`
`ComponentMonitor` | `currentMonitor()` Returns the monitor currently used
`
`<U extends ComponentAdapter> U`
` | `findAdapterOfType(Class<U> adapterType)` Locates a component adapter of type componentAdapterType in the ComponentAdapter chain.
`Class<T>` | `getComponentImplementation()` Retrieve the class of the component.
`T` | `getComponentInstance(PicoContainer container)` Retrieve the component instance.
`Object` | `getComponentKey()` Retrieve the key associated with the component.
`ComponentAdapter<T>` | `getDelegate()` Component adapters may be nested in a chain, and this method is used to grab the next ComponentAdapter in the chain.
`String` | `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
`getComponentInstance, getDescriptor, verify`

Constructor Detail

### AbstractAdapter

    public AbstractAdapter(Object componentKey,
                           Class componentImplementation)

  Constructs a new ComponentAdapter for the given key and implementation.

  Parameters:
    `componentKey` - the search key for this implementation
    `componentImplementation` - the concrete implementation

### AbstractAdapter

    public AbstractAdapter(Object componentKey,
                           Class componentImplementation,
                           ComponentMonitor monitor)

  Constructs a new ComponentAdapter for the given key and implementation.

  Parameters:
    `componentKey` - the search key for this implementation
    `componentImplementation` - the concrete implementation
    `monitor` - the component monitor used by this ComponentAdapter

Method Detail

### getComponentKey

    public Object getComponentKey()

  Retrieve the key associated with the component.

  Specified by:
    `getComponentKey` in interface `ComponentAdapter<T>`
  Returns:
    the component's key. Should either be a class type (normally an interface) or an identifier that is unique (within the scope of the current PicoContainer).
  See Also:
    `ComponentAdapter.getComponentKey()`

### getComponentImplementation

    public Class<T> getComponentImplementation()

  Retrieve the class of the component.

  Specified by:
    `getComponentImplementation` in interface `ComponentAdapter<T>`
  Returns:
    the component's implementation class. Should normally be a concrete class (ie, a class that can be instantiated).
  See Also:
    `ComponentAdapter.getComponentImplementation()`

### checkTypeCompatibility

    protected void checkTypeCompatibility()

### getComponentInstance

    public T getComponentInstance(PicoContainer container)
                           throws PicoCompositionException

  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 interface `ComponentAdapter<T>`
  Parameters:
    `container` - the `PicoContainer`, that is used to resolve any possible dependencies of the instance.
  Returns:
    the component instance.
  Throws:
    `PicoCompositionException` - if the component has dependencies which could not be resolved, or instantiation of the component lead to an ambigous situation within the container.

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`
  Returns:
    Returns the ComponentAdapter's class name and the component's key.
  See Also:
    `Object.toString()`

### accept

    public void accept(PicoVisitor visitor)

  Description copied from interface: `ComponentAdapter`
  Accepts a visitor for this ComponentAdapter. The method is normally called by visiting a `PicoContainer`, that cascades the visitor also down to all its ComponentAdapter instances.

  Specified by:
    `accept` in interface `ComponentAdapter<T>`
  Parameters:
    `visitor` - the visitor.

### changeMonitor

    public void changeMonitor(ComponentMonitor monitor)

  Description copied from interface: `ComponentMonitorStrategy`
  Changes the component monitor used

  Specified by:
    `changeMonitor` in interface `ComponentMonitorStrategy`
  Parameters:
    `monitor` - the new ComponentMonitor to use

### currentMonitor

    public ComponentMonitor currentMonitor()

  Returns the monitor currently used

  Specified by:
    `currentMonitor` in interface `ComponentMonitorStrategy`
  Returns:
    The ComponentMonitor currently used

### getDelegate

    public final ComponentAdapter<T> getDelegate()

  Description copied from interface: `ComponentAdapter`
  Component adapters may be nested in a chain, and this method is used to grab the next ComponentAdapter in the chain.

  Specified by:
    `getDelegate` in interface `ComponentAdapter<T>`
  Returns:
    the next component adapter in line or null if there is no delegate ComponentAdapter.

### findAdapterOfType

    public final <U extends ComponentAdapter> U findAdapterOfType(Class<U> adapterType)

  Description copied from interface: `ComponentAdapter`
  Locates a component adapter of type componentAdapterType in the ComponentAdapter chain. Will return null if there is no adapter of the given type.

  Specified by:
    `findAdapterOfType` in interface `ComponentAdapter<T>`
  Type Parameters:
    `U` - the type of ComponentAdapter being located.
  Returns:
    the appropriate component adapter of type U. May return null if the component adapter type is not returned.

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