Examples of org.hibernate.loader.plan.spi.CollectionReference

org.hibernate.loader.plan.spi.CollectionReference
Represents a reference to a persistent collection either as a Return or as a {@link CollectionAttributeFetch}. @author Steve Ebersole


  @Override
  public void startingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
    final Type indexType = collectionIndexDefinition.getType();
    if ( indexType.isAssociationType() || indexType.isComponentType() ) {
      final CollectionReference collectionReference = collectionReferenceStack.peekFirst();
      final FetchOwner indexGraph = collectionReference.getIndexGraph();
      if ( indexGraph == null ) {
        throw new WalkingException( "Collection reference did not return index handler" );
      }
      pushToStack( indexGraph );
    }

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  }


  @Override
  public void startingCollectionElements(CollectionElementDefinition elementDefinition) {
    if ( elementDefinition.getType().isAssociationType() || elementDefinition.getType().isComponentType() ) {
      final CollectionReference collectionReference = collectionReferenceStack.peekFirst();
      final FetchOwner elementGraph = collectionReference.getElementGraph();
      if ( elementGraph == null ) {
        throw new WalkingException( "Collection reference did not return element handler" );
      }
      pushToStack( elementGraph );
    }

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  }


  @Override
  public void finishingCollection(CollectionDefinition collectionDefinition) {
    // pop the current fetch owner, and make sure what we just popped represents this collection
    final CollectionReference collectionReference = popFromCollectionStack();
    if ( ! collectionReference.getCollectionPersister().equals( collectionDefinition.getCollectionPersister() ) ) {
      throw new WalkingException( "Mismatched FetchOwner from stack on pop" );
    }


    log.tracef(
        "%s Finished collection : %s",

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    mdcStack().push( collectionReference.getPropertyPath() );
    collectionReferenceStack.addFirst( collectionReference );
  }


  private CollectionReference popFromCollectionStack() {
    final CollectionReference last = collectionReferenceStack.removeFirst();
    log.trace( "Popped collection reference from stack : " + last );
    mdcStack().pop();
    if ( FetchStackAware.class.isInstance( last ) ) {
      ( (FetchStackAware) last ).poppedFromStack();
    }

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    propertyPathStack.push( collectionReference.getPropertyPath() );
    collectionReferenceStack.addFirst( collectionReference );
  }


  private CollectionReference popFromCollectionStack() {
    final CollectionReference last = collectionReferenceStack.removeFirst();
    log.trace( "Popped collection reference from stack : " + last );
    propertyPathStack.pop();
    return last;
  }

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    if ( !isRoot ) {
      // if not, this call should represent a fetch which will be handled in #finishingAttribute
      return;
    }


    final CollectionReference popped = popFromCollectionStack();
    checkedPoppedCollection( popped, collectionDefinition );


    log.tracef(
        "%s Finished root collection : %s",
        StringHelper.repeat( "<<", fetchSourceStack.size() ),

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        "%s Starting collection index graph : %s",
        StringHelper.repeat( ">>", fetchSourceStack.size() ),
        indexDefinition.getCollectionDefinition().getCollectionPersister().getRole()
    );


    final CollectionReference collectionReference = currentCollection();
    final CollectionFetchableIndex indexGraph = collectionReference.getIndexGraph();


    if ( indexType.isEntityType() || indexType.isComponentType() ) {
      if ( indexGraph == null ) {
        throw new WalkingException(
            "CollectionReference did not return an expected index graph : " +

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        "%s Starting collection element graph : %s",
        StringHelper.repeat( ">>", fetchSourceStack.size() ),
        elementDefinition.getCollectionDefinition().getCollectionPersister().getRole()
    );


    final CollectionReference collectionReference = currentCollection();
    final CollectionFetchableElement elementGraph = collectionReference.getElementGraph();


    if ( elementType.isAssociationType() || elementType.isComponentType() ) {
      if ( elementGraph == null ) {
        throw new IllegalStateException(
            "CollectionReference did not return an expected element graph : " +

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          final ExpandingFetchSource popped = popFromStack();
          checkPoppedEntity( popped, associationAttributeDefinition.toEntityDefinition() );
        }
      }
      else if ( attributeType.isCollectionType() ) {
        final CollectionReference currentCollection = currentCollection();
        // One way to find out if the fetch was pushed is to check the fetch strategy; rather than recomputing
        // the fetch strategy, simply check if current collection's fetched attribute definition matches
        // associationAttributeDefinition.
        if ( AttributeFetch.class.isInstance( currentCollection ) &&
            associationAttributeDefinition.equals( AttributeFetch.class.cast( currentCollection ).getFetchedAttributeDefinition() ) ) {
          final CollectionReference popped = popFromCollectionStack();
          checkedPoppedCollection( popped, associationAttributeDefinition.toCollectionDefinition() );
        }
      }
    }
    else if ( attributeType.isComponentType() ) {

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    propertyPathStack.push( collectionReference.getPropertyPath() );
    collectionReferenceStack.addFirst( collectionReference );
  }


  private CollectionReference popFromCollectionStack() {
    final CollectionReference last = collectionReferenceStack.removeFirst();
    log.trace( "Popped collection reference from stack : " + last );
    propertyPathStack.pop();
    return last;
  }

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