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## org.modeshape.graph.query.process
Class DependentQueryComponent

    java.lang.Object
      org.modeshape.graph.query.process.ProcessingComponent
          org.modeshape.graph.query.process.DependentQueryComponent

    public class DependentQueryComponent

extends ProcessingComponent

A `ProcessingComponent` that executes a `dependent query` node by first executing the left component and then executing the right component. If a variable name is specified, this component will save the query results from the the corresponding component into the `variables` in the `QueryContext`.

Nested Class Summary

Nested classes/interfaces inherited from class org.modeshape.graph.query.process.ProcessingComponent
`ProcessingComponent.DynamicOperation`

Constructor Summary
`DependentQueryComponent(QueryContext context, ProcessingComponent left, ProcessingComponent right, String leftVariableName, String rightVariableName)`

Method Summary
`protected QueryResults.Columns` | `colunnsOfDependentQuery()` Get the columns definition for the results from the right component that is dependent upon the left.
`protected QueryResults.Columns` | `colunnsOfIndependentQuery()` Get the columns definition for the results from the left, independent query that is processed first.
`List<Object[]>` | `execute()` Execute this stage of processing and return the resulting tuples that each conform to the `columns`.
`protected ProcessingComponent` | `left()` Get the processing component that serves as the left side of the join.
`protected ProcessingComponent` | `right()` Get the processing component that serves as the right side of the join.
`protected void` | `saveResultsToVariable(List<Object[]> results, String variableName)`

Methods inherited from class org.modeshape.graph.query.process.ProcessingComponent
`close, createDynamicOperation, createSortComparator, emptyTuples, getColumns, getContext, problems`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DependentQueryComponent

    public DependentQueryComponent(QueryContext context,
                                   ProcessingComponent left,
                                   ProcessingComponent right,
                                   String leftVariableName,
                                   String rightVariableName)

Method Detail

### left

    protected final ProcessingComponent left()

  Get the processing component that serves as the left side of the join.

  Returns:
    the left-side processing component; never null

### right

    protected final ProcessingComponent right()

  Get the processing component that serves as the right side of the join.

  Returns:
    the right-side processing component; never null

### colunnsOfIndependentQuery

    protected final QueryResults.Columns colunnsOfIndependentQuery()

  Get the columns definition for the results from the left, independent query that is processed first.

  Returns:
    the left-side columns; never null

### colunnsOfDependentQuery

    protected final QueryResults.Columns colunnsOfDependentQuery()

  Get the columns definition for the results from the right component that is dependent upon the left.

  Returns:
    the right-side columns; never null

### execute

    public List<Object[]> execute()

  Execute this stage of processing and return the resulting tuples that each conform to the `columns`.

  Specified by:
    `execute` in class `ProcessingComponent`
  Returns:
    the list of tuples, where each tuple corresonds to the `columns`; never null
  See Also:
    `ProcessingComponent.execute()`

### saveResultsToVariable

    protected void saveResultsToVariable(List<Object[]> results,
                                         String variableName)

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