BeanContext (Java Platform SE 8 )
Keywords: java.beans.beancontext.BeanContext interface
Date: 2015-11-19

java.beans.beancontext

## Interface BeanContext

- All Superinterfaces:
    BeanContextChild, Collection, DesignMode, Iterable, Visibility
  All Known Subinterfaces:
    BeanContextServices
  All Known Implementing Classes:
    BeanContextServicesSupport, BeanContextSupport

      public interface BeanContext
      extends BeanContextChild, Collection, DesignMode, Visibility

  The BeanContext acts a logical hierarchical container for JavaBeans.

  Since:
    1.2
  See Also:
    `Beans`, `BeanContextChild`, `BeanContextMembershipListener`, `PropertyChangeEvent`, `DesignMode`, `Visibility`, `Collection`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static Object` | `globalHierarchyLock` This global lock is used by both `BeanContext` and `BeanContextServices` implementors to serialize changes in a `BeanContext` hierarchy and any service requests etc.

    - ### Fields inherited from interface java.beans.DesignMode

      `PROPERTYNAME`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addBeanContextMembershipListener(BeanContextMembershipListener bcml)` Adds the specified `BeanContextMembershipListener` to receive `BeanContextMembershipEvents` from this `BeanContext` whenever it adds or removes a child `Component`(s).
    `URL` | `getResource(String name, BeanContextChild bcc)` Analagous to `java.lang.ClassLoader.getResource()`, this method allows a `BeanContext` implementation to interpose behavior between the child `Component` and underlying `ClassLoader`.
    `InputStream` | `getResourceAsStream(String name, BeanContextChild bcc)` Analagous to `java.lang.ClassLoader.getResourceAsStream()`, this method allows a `BeanContext` implementation to interpose behavior between the child `Component` and underlying `ClassLoader`.
    `Object` | `instantiateChild(String beanName)` Instantiate the javaBean named as a child of this `BeanContext`.
    `void` | `removeBeanContextMembershipListener(BeanContextMembershipListener bcml)` Removes the specified `BeanContextMembershipListener` so that it no longer receives `BeanContextMembershipEvent`s when the child `Component`(s) are added or removed.

    - ### Methods inherited from interface java.beans.beancontext.BeanContextChild

      `addPropertyChangeListener, addVetoableChangeListener, getBeanContext, removePropertyChangeListener, removeVetoableChangeListener, setBeanContext`

    - ### Methods inherited from interface java.util.Collection

      `add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, parallelStream, remove, removeAll, removeIf, retainAll, size, spliterator, stream, toArray, toArray`

    - ### Methods inherited from interface java.lang.Iterable

      `forEach`

    - ### Methods inherited from interface java.beans.DesignMode

      `isDesignTime, setDesignTime`

    - ### Methods inherited from interface java.beans.Visibility

      `avoidingGui, dontUseGui, needsGui, okToUseGui`

- - ### Field Detail

    - #### globalHierarchyLock

          static final Object globalHierarchyLock

      This global lock is used by both `BeanContext` and `BeanContextServices` implementors to serialize changes in a `BeanContext` hierarchy and any service requests etc.

  - ### Method Detail

    - #### instantiateChild

          Object instantiateChild(String beanName)
                           throws IOException,
                                  ClassNotFoundException

      Instantiate the javaBean named as a child of this `BeanContext`. The implementation of the JavaBean is derived from the value of the beanName parameter, and is defined by the `java.beans.Beans.instantiate()` method.
      Parameters:
        `beanName` - The name of the JavaBean to instantiate as a child of this `BeanContext`
      Returns:
        a javaBean named as a child of this `BeanContext`
      Throws:
        `IOException` - if an IO problem occurs
        `ClassNotFoundException` - if the class identified by the beanName parameter is not found

    - #### getResourceAsStream

          InputStream getResourceAsStream(String name,
                                          BeanContextChild bcc)
                                   throws IllegalArgumentException

      Analagous to `java.lang.ClassLoader.getResourceAsStream()`, this method allows a `BeanContext` implementation to interpose behavior between the child `Component` and underlying `ClassLoader`.
      Parameters:
        `name` - the resource name
        `bcc` - the specified child
      Returns:
        an `InputStream` for reading the resource, or `null` if the resource could not be found.
      Throws:
        `IllegalArgumentException` - if the resource is not valid

    - #### getResource

          URL getResource(String name,
                          BeanContextChild bcc)
                   throws IllegalArgumentException

      Analagous to `java.lang.ClassLoader.getResource()`, this method allows a `BeanContext` implementation to interpose behavior between the child `Component` and underlying `ClassLoader`.
      Parameters:
        `name` - the resource name
        `bcc` - the specified child
      Returns:
        a `URL` for the named resource for the specified child
      Throws:
        `IllegalArgumentException` - if the resource is not valid

    - #### addBeanContextMembershipListener

          void addBeanContextMembershipListener(BeanContextMembershipListener bcml)

      Adds the specified `BeanContextMembershipListener` to receive `BeanContextMembershipEvents` from this `BeanContext` whenever it adds or removes a child `Component`(s).
      Parameters:
        `bcml` - the BeanContextMembershipListener to be added

    - #### removeBeanContextMembershipListener

          void removeBeanContextMembershipListener(BeanContextMembershipListener bcml)

      Removes the specified `BeanContextMembershipListener` so that it no longer receives `BeanContextMembershipEvent`s when the child `Component`(s) are added or removed.
      Parameters:
        `bcml` - the `BeanContextMembershipListener` to be removed

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