org.apache.ode.utils.stl

## Class MemberOfFunction<E>

- java.lang.Object
- - org.apache.ode.utils.stl.MemberOfFunction<E>

- All Implemented Interfaces:
    UnaryFunction<E,java.lang.Boolean>, UnaryFunctionEx<E,java.lang.Boolean>
  Direct Known Subclasses:
    EqualsUnaryFunction, MemberOfFunction.InstanceOf

      public abstract class MemberOfFunction<E>
      extends java.lang.Object
      implements UnaryFunction<E,java.lang.Boolean>

  Interface used for defining object filters/selectors, classes that are used to determine whether a given object belong in a set.

  Created on Feb 4, 2004 at 4:48:55 PM.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `MemberOfFunction.InstanceOf`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MemberOfFunction()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.Boolean` | `apply(E x)` Implementation of `UnaryFunction` method defering to `#isMember(E)`.
    `abstract boolean` | `isMember(E o)` A unary function that tests whether an element is the member of a set.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### MemberOfFunction

          public MemberOfFunction()

  - ### Method Detail

    - #### isMember

          public abstract boolean isMember(E o)

      A unary function that tests whether an element is the member of a set.
      Parameters:
        `o` - element to test
      Returns:
        `true` if element is a member

    - #### apply

          public final java.lang.Boolean apply(E x)

      Implementation of `UnaryFunction` method defering to `#isMember(E)`.
      Specified by:
        `apply` in interface `UnaryFunction<E,java.lang.Boolean>`
      Specified by:
        `apply` in interface `UnaryFunctionEx<E,java.lang.Boolean>`
      Parameters:
        `x` - element to test
      Returns:
        `Boolean.TRUE` if isMemeber returns `true`, `false` otherwise