Package org.eclipse.rdf4j.federated.evaluation.iterator

## Class StatementConversionIteration

- java.lang.Object
- - org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet,​QueryEvaluationException>
  - - org.eclipse.rdf4j.federated.evaluation.iterator.StatementConversionIteration

- All Implemented Interfaces:
    `AutoCloseable`, `CloseableIteration<BindingSet,​QueryEvaluationException>`, `Iteration<BindingSet,​QueryEvaluationException>`

      public class StatementConversionIteration
      extends AbstractCloseableIteration<BindingSet,​QueryEvaluationException>

  Converts Statement iteration (i.e. RepositoryResult) into the corresponding binding set. Note that exceptions are converted appropriately as well.
  Author:
    Andreas Schwarte

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected BindingSet` | `bindings` |
    `protected RepositoryResult<Statement>` | `repoResult` |
    `protected StatementPattern` | `stmt` |
    `protected boolean` | `updateContext` |
    `protected boolean` | `updateObj` |
    `protected boolean` | `updatePred` |
    `protected boolean` | `updateSubj` |

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `StatementConversionIteration​(RepositoryResult<Statement> repoResult, BindingSet bindings, StatementPattern stmt)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected BindingSet` | `convert​(Statement st)` |
    `protected QueryEvaluationException` | `convertException​(Exception e)` |
    `protected void` | `handleClose()` | Called by `AbstractCloseableIteration.close()` when it is called for the first time.
    `boolean` | `hasNext()` | Returns true if the iteration has more elements.
    `protected void` | `init()` |
    `BindingSet` | `next()` | Returns the next element in the iteration.
    `void` | `remove()` | Removes from the underlying collection the last element returned by the iteration (optional operation).

    - ### 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`

- - ### Field Detail

    - #### repoResult

          protected final RepositoryResult<Statement> repoResult

    - #### bindings

          protected final BindingSet bindings

    - #### stmt

          protected final StatementPattern stmt

    - #### updateSubj

          protected boolean updateSubj

    - #### updatePred

          protected boolean updatePred

    - #### updateObj

          protected boolean updateObj

    - #### updateContext

          protected boolean updateContext

  - ### Constructor Detail

    - #### StatementConversionIteration

          public StatementConversionIteration​(RepositoryResult<Statement> repoResult,
                                              BindingSet bindings,
                                              StatementPattern stmt)

  - ### Method Detail

    - #### init

          protected void init()

    - #### hasNext

          public boolean hasNext()
                          throws QueryEvaluationException

      Description copied from interface: `Iteration`
      Returns true if the iteration has more elements. (In other words, returns true if `Iteration.next()` would return an element rather than throwing a NoSuchElementException.)
      Returns:
        true if the iteration has more elements.
      Throws:
        `QueryEvaluationException`

    - #### next

          public BindingSet next()
                          throws QueryEvaluationException

      Description copied from interface: `Iteration`
      Returns the next element in the iteration.
      Returns:
        the next element in the iteration.
      Throws:
        `QueryEvaluationException`

    - #### remove

          public void remove()
                      throws QueryEvaluationException

      Description copied from interface: `Iteration`
      Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.
      Throws:
        `QueryEvaluationException`

    - #### handleClose

          protected void handleClose()
                              throws QueryEvaluationException

      Description copied from class: `AbstractCloseableIteration`
      Called by `AbstractCloseableIteration.close()` when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.
      Overrides:
        `handleClose` in class `AbstractCloseableIteration<BindingSet,​QueryEvaluationException>`
      Throws:
        `QueryEvaluationException`

    - #### convert

          protected BindingSet convert​(Statement st)

    - #### convertException

          protected QueryEvaluationException convertException​(Exception e)