org.eclipse.incquery.runtime.rete.recipes

## Interface ExistenceJoinRecipe

- All Superinterfaces:
    BetaRecipe, org.eclipse.emf.ecore.EObject, org.eclipse.emf.common.notify.Notifier, ReteNodeRecipe
  All Known Subinterfaces:
    AntiJoinRecipe, SemiJoinRecipe
  All Known Implementing Classes:
    AntiJoinRecipeImpl, ExistenceJoinRecipeImpl, SemiJoinRecipeImpl

      public interface ExistenceJoinRecipe
      extends BetaRecipe

  A representation of the model object 'Existence Join Recipe'. Existence joins are TODO See http://en.wikipedia.org/wiki/Relational_algebra
  See Also:
    `RecipesPackage.getExistenceJoinRecipe()`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getArity()`

    - ### Methods inherited from interface org.eclipse.incquery.runtime.rete.recipes.BetaRecipe

      `getLeftParent, getRightParent, setLeftParent, setRightParent`

    - ### Methods inherited from interface org.eclipse.incquery.runtime.rete.recipes.ReteNodeRecipe

      `getTraceInfo, setTraceInfo`

    - ### Methods inherited from interface org.eclipse.emf.ecore.EObject

      `eAllContents, eClass, eContainer, eContainingFeature, eContainmentFeature, eContents, eCrossReferences, eGet, eGet, eInvoke, eIsProxy, eIsSet, eResource, eSet, eUnset`

    - ### Methods inherited from interface org.eclipse.emf.common.notify.Notifier

      `eAdapters, eDeliver, eNotify, eSetDeliver`

- - ### Method Detail

    - #### getArity

          int getArity()

      Specified by:
        `getArity` in interface `ReteNodeRecipe`