Examples of org.eclipse.persistence.jpa.jpql.parser.CollectionValuedPathExpression

Package org.eclipse.persistence.jpa.jpql.parser

Examples of org.eclipse.persistence.jpa.jpql.parser.CollectionValuedPathExpression

org.eclipse.persistence.jpa.jpql.parser.CollectionValuedPathExpression
A collection_valued_field is designated by the name of an association field in a one-to-many or a many-to-many relationship or by the name of an element collection field. The type of a collection_valued_field is a collection of values of the abstract schema type of the related entity or element type.
BNF: collection_valued_path_expression ::= general_identification_variable.{single_valued_object_field.}*collection_valued_field
@version 2.4 @since 2.3 @author Pascal Filion

    // Add the attribute
    Expression queryExpression = queryContext.buildExpression(expression.getExpression());
    addAttribute("size", queryExpression.count(), Integer.class);


    // Now add the GROUP BY expression
    CollectionValuedPathExpression pathExpression = (CollectionValuedPathExpression) expression.getExpression();
    queryExpression = queryContext.buildGroupByExpression(pathExpression);
    query.addGrouping(queryExpression);
  }

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    Expression rootObject = expression.getRootObject();


    // Special case, the path expression could be a fully qualified class name,
    // make sure to not validate it as collection-valued path expression
    CollectionValuedPathExpression pathExpression = getCollectionValuedPathExpression(rootObject);


    if (pathExpression != null) {
      String path = pathExpression.toActualText();


      // The path expression is not a fully qualified class name
      if (helper.getType(path) == null) {
        pathExpression.accept(this);
      }
    }
    else {
      rootObject.accept(this);
    }

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    expression.getEntityExpression().accept(this);
    Expression entityExpression = queryExpression;


    if (expression.hasNot()) {


      CollectionValuedPathExpression pathExpression = (CollectionValuedPathExpression) expression.getCollectionValuedPathExpression();


      // Retrieve the ExpressionBuilder from the collection-valued path expression's
      // identification variable and the variable name
      pathExpression.getIdentificationVariable().accept(this);
      Expression parentExpression = queryExpression;


      // Now create the actual expression
      Expression newBuilder = new ExpressionBuilder();
      Expression collectionBase = newBuilder;
            for (int i = 1; i < pathExpression.pathSize() - 1; i++) {
                // nested paths must be single valued.
                collectionBase = collectionBase.get(pathExpression.getPath(i));
            }
            String lastPath = pathExpression.getPath(pathExpression.pathSize() - 1);
            // The following code is copied from Expression.noneOf and altered a bit
            Expression criteria = newBuilder.equal(parentExpression).and(collectionBase.anyOf(lastPath).equal(entityExpression));
            ReportQuery subQuery = new ReportQuery();
            subQuery.setShouldRetrieveFirstPrimaryKey(true);
            subQuery.setSelectionCriteria(criteria);

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   * {@inheritDoc}
   */
  @Override
  public void visit(EmptyCollectionComparisonExpression expression) {


    CollectionValuedPathExpression collectionPath = (CollectionValuedPathExpression) expression.getExpression();
    int lastPathIndex = collectionPath.pathSize() - 1;
    String name = collectionPath.getPath(lastPathIndex);


    // Create the expression for the collection-valued path expression (except the last path)
    visitPathExpression(collectionPath, false, lastPathIndex);


    // Create the IS EMPTY expression

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   * {@inheritDoc}
   */
  @Override
  public void visit(SizeExpression expression) {


    CollectionValuedPathExpression pathExpression = (CollectionValuedPathExpression) expression.getExpression();
    int lastIndex = pathExpression.pathSize() - 1;


    // Create the right chain of expressions
    visitPathExpression(pathExpression, false, lastIndex - 1);


    // Now create the SIZE expression
    String name = pathExpression.getPath(lastIndex);
    queryExpression = queryExpression.size(name);


    // Set the expression type
    type[0] = Integer.class;
  }

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    Expression rootObject = expression.getRootObject();


    // Special case, the path expression could be a fully qualified class name,
    // make sure to not validate it as collection-valued path expression
    CollectionValuedPathExpression pathExpression = getCollectionValuedPathExpression(rootObject);


    if (pathExpression != null) {
      String path = pathExpression.toActualText();


      // The path expression is not a fully qualified class name
      if (helper.getType(path) == null) {
        pathExpression.accept(this);
      }
    }
    else {
      rootObject.accept(this);
    }

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                                                           boolean collectionTypeOnly) {


    boolean valid = true;


    // The path expression resolves to a collection-valued path expression
    CollectionValuedPathExpression collectionValuedPathExpression = getCollectionValuedPathExpression(expression);


    if (collectionValuedPathExpression != null &&
        collectionValuedPathExpression.hasIdentificationVariable() &&
       !collectionValuedPathExpression.endsWithDot()) {


      // A collection_valued_field is designated by the name of an association field in a
      // one-to-many or a many-to-many relationship or by the name of an element collection field
      Object mapping = helper.resolveMapping(expression);
      Object type = helper.getMappingType(mapping);

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    expression.getEntityExpression().accept(this);
    Expression entityExpression = queryExpression;


    if (expression.hasNot()) {


      CollectionValuedPathExpression pathExpression = (CollectionValuedPathExpression) expression.getCollectionValuedPathExpression();


      // Retrieve the ExpressionBuilder from the collection-valued path expression's
      // identification variable and the variable name
      pathExpression.getIdentificationVariable().accept(this);
      Expression parentExpression = queryExpression;


      // Now create the actual expression
      String lastPath = pathExpression.getPath(pathExpression.pathSize() - 1);
      queryExpression = new ExpressionBuilder().equal(entityExpression);
      queryExpression = parentExpression.noneOf(lastPath, queryExpression);
    }
    else {
      // Create the expression for the collection-valued path expression

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   * {@inheritDoc}
   */
  @Override
  public void visit(EmptyCollectionComparisonExpression expression) {


    CollectionValuedPathExpression collectionPath = (CollectionValuedPathExpression) expression.getExpression();
    int lastPathIndex = collectionPath.pathSize() - 1;
    String name = collectionPath.getPath(lastPathIndex);


    // Create the expression for the collection-valued path expression (except the last path)
    visitPathExpression(collectionPath, false, lastPathIndex);


    // Create the IS EMPTY expression

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   * {@inheritDoc}
   */
  @Override
  public void visit(SizeExpression expression) {


    CollectionValuedPathExpression pathExpression = (CollectionValuedPathExpression) expression.getExpression();
    int lastIndex = pathExpression.pathSize() - 1;


    // Create the right chain of expressions
    visitPathExpression(pathExpression, false, lastIndex - 1);


    // Now create the SIZE expression
    String name = pathExpression.getPath(lastIndex);
    queryExpression = queryExpression.size(name);


    // Set the expression type
    type[0] = Integer.class;
  }

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