Package org.eclipse.rdf4j.common.iteration

## Class MinusIteration<E,​X extends Exception>

- java.lang.Object
- - org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,​X>
  - - org.eclipse.rdf4j.common.iteration.IterationWrapper<E,​X>
    - - org.eclipse.rdf4j.common.iteration.FilterIteration<E,​X>
      - - org.eclipse.rdf4j.common.iteration.MinusIteration<E,​X>

- All Implemented Interfaces:
    `AutoCloseable`, `CloseableIteration<E,​X>`, `Iteration<E,​X>`

      public class MinusIteration<E,​X extends Exception>
      extends FilterIteration<E,​X>

  An Iteration that returns the results of an Iteration (the left argument) minus the results of another Iteration (the right argument). Optionally, the Iteration can be configured to filter duplicates from the returned elements.

  Note that duplicates can also be filtered by wrapping this Iteration in a `DistinctIteration`, but that has a bit more overhead as it adds a second hash table lookup.

- - ### Field Summary

    - ### Fields inherited from class org.eclipse.rdf4j.common.iteration.IterationWrapper

      `wrappedIter`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MinusIteration​(Iteration<? extends E,​X> leftArg, Iteration<? extends E,​X> rightArg)` | Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.
    `MinusIteration​(Iteration<? extends E,​X> leftArg, Iteration<? extends E,​X> rightArg, boolean distinct)` | Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected boolean` | `accept​(E object)` | Tests whether or not the specified object should be returned by this Iteration.
    `protected void` | `handleClose()` | Closes this Iteration and also closes the wrapped Iteration if it is a `CloseableIteration`.

    - ### Methods inherited from class org.eclipse.rdf4j.common.iteration.FilterIteration

      `hasNext, next`

    - ### Methods inherited from class org.eclipse.rdf4j.common.iteration.IterationWrapper

      `remove`

    - ### Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

      `close, isClosed`

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

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

    - ### Methods inherited from interface org.eclipse.rdf4j.common.iteration.Iteration

      `stream`

- - ### Constructor Detail

    - #### MinusIteration

          public MinusIteration​(Iteration<? extends E,​X> leftArg,
                                Iteration<? extends E,​X> rightArg)

      Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument. By default, duplicates are not filtered from the results.
      Parameters:
        `leftArg` - An Iteration containing the main set of elements.
        `rightArg` - An Iteration containing the set of elements that should be filtered from the main set.

    - #### MinusIteration

          public MinusIteration​(Iteration<? extends E,​X> leftArg,
                                Iteration<? extends E,​X> rightArg,
                                boolean distinct)

      Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.
      Parameters:
        `leftArg` - An Iteration containing the main set of elements.
        `rightArg` - An Iteration containing the set of elements that should be filtered from the main set.
        `distinct` - Flag indicating whether duplicate elements should be filtered from the result.

  - ### Method Detail

    - #### accept

          protected boolean accept​(E object)
                            throws X extends Exception

      Description copied from class: `FilterIteration`
      Tests whether or not the specified object should be returned by this Iteration. All objects from the wrapped Iteration pass through this method in the same order as they are coming from the wrapped Iteration.
      Specified by:
        `accept` in class `FilterIteration<E,​X extends Exception>`
      Parameters:
        `object` - The object to be tested.
      Returns:
        true if the object should be returned, false otherwise.
      Throws:
        `X`
        `X extends Exception`

    - #### handleClose

          protected void handleClose()
                              throws X extends Exception

      Description copied from class: `IterationWrapper`
      Closes this Iteration and also closes the wrapped Iteration if it is a `CloseableIteration`.
      Overrides:
        `handleClose` in class `FilterIteration<E,​X extends Exception>`
      Throws:
        `X`
        `X extends Exception`