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

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

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

org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable
An identification variable is a valid identifier declared in the FROM clause of a query.
Requirements:
- All identification variables must be declared in the FROM clause. Identification variables cannot be declared in other clauses.
- An identification variable must not be a reserved identifier or have the same name as any entity in the same persistence unit.
- Identification variables are case insensitive.
- An identification variable evaluates to a value of the type of the expression used in declaring the variable.
An identification variable can range over an entity, embeddable, or basic abstract schema type. An identification variable designates an instance of an abstract schema type or an element of a collection of abstract schema type instances.
Note that for identification variables referring to an instance of an association or collection represented as a {@link java.util.Map}, the identification variable is of the abstract schema type of the map value.
An identification variable always designates a reference to a single value. It is declared in one of three ways:
- In a range variable declaration;
- In a join clause;
- In a collection member declaration.
The identification variable declarations are evaluated from left to right in the FROM clause, and an identification variable declaration can use the result of a preceding identification variable declaration of the query string.
All identification variables used in the SELECT, WHERE, ORDER BY, GROUP BY, or HAVING clause of a SELECT or DELETE statement must be declared in the FROM clause. The identification variables used in the WHERE clause of an UPDATE statement must be declared in the UPDATE clause.
An identification variable is scoped to the query (or subquery) in which it is defined and is also visible to any subqueries within that query scope that do not define an identification variable of the same name. @version 2.4 @since 2.3 @author Pascal Filion

    /**
     * {@link InputParameter}
     */
    @Override
    public void visit(ValueExpression expression) {
      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();
      Declaration declaration = queryContext.getDeclaration(identificationVariable.getVariableName());
      descriptor = declaration.getDescriptor();
    }

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      declaration.declarationExpression = expression;
      declarations.add(declaration);


      // A derived collection member declaration does not have an identification variable
      if (!expression.isDerived()) {
        IdentificationVariable identificationVariable = (IdentificationVariable) expression.getIdentificationVariable();
        declaration.identificationVariable = identificationVariable;
      }


      // This collection member declaration is the first defined,
      // it is then the base Declaration

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    public void visit(Join expression) {


      ((AbstractRangeDeclaration) currentDeclaration).addJoin(expression);


      if (!expression.hasFetch() || expression.hasIdentificationVariable()) {
        IdentificationVariable identificationVariable = (IdentificationVariable) expression.getIdentificationVariable();


        JoinDeclaration declaration = new JoinDeclaration(queryContext);
        declaration.baseExpression = expression;
        declaration.identificationVariable = identificationVariable;
        declarations.add(declaration);

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    /**
     * {@inheritDoc}
     */
    @Override
    public void visit(ResultVariable expression) {
      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getResultVariable();
      resultVariables.add(identificationVariable);
    }

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      // If a subquery is defined in a WHERE clause of an update query,
      // then check for a path expression
      if (isWithinSubquery(expression)) {


        // Find the identification variable from the UPDATE range declaration
        IdentificationVariable identificationVariable = findVirtualIdentificationVariable(expression);
        String variableName = (identificationVariable != null) ? identificationVariable.getText() : null;


        if (ExpressionTools.stringIsNotEmpty(variableName)) {


          Object mapping = helper.resolveMapping(variableName, abstractSchemaName);
          Object type = helper.getMappingType(mapping);

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        // The left expression cannot be an identification variable
        if (validator.leftIdentificationVariable &&
            validator.leftIdentificationVariableValid) {


          IdentificationVariable variable = (IdentificationVariable) leftExpression;


          // There is a specific EclipseLink case where it is valid to use an
          // identification variable, which is when the identification variable
          // maps to a direct collection mapping
          if (!isIdentificationVariableValidInComparison(variable)) {


            addProblem(
              leftExpression,
              ComparisonExpression_IdentificationVariable,
              leftExpression.toActualText(),
              expression.getComparisonOperator()
            );


            valid = false;
          }
        }
        // The left expression is a path expression
        else if (validator.leftStateFieldPathExpression &&
                 validator.leftStateFieldPathExpressionValid) {


          Object mapping = helper.resolveMapping(leftExpression);


          // The path expression cannot be a non-basic mapping
          if ((mapping != null) && !helper.isPropertyMapping(mapping)) {


            addProblem(
              leftExpression,
              ComparisonExpression_AssociationField,
              leftExpression.toActualText(),
              expression.getComparisonOperator()
            );


            valid = false;
          }
        }


        // The right expression cannot be an identification variable
        if (validator.rightIdentificationVariable &&
            validator.rightIdentificationVariableValid) {


          IdentificationVariable variable = (IdentificationVariable) rightExpression;


          // There is a specific EclipseLink case where it is valid to use an
          // identification variable, which is when the identification variable
          // maps to a direct collection mapping
          if (!isIdentificationVariableValidInComparison(variable)) {


            addProblem(
              rightExpression,
              ComparisonExpression_IdentificationVariable,
              rightExpression.toActualText(),
              expression.getComparisonOperator()
            );


            valid = false;
          }
        }
        // The right expression is a path expression
        else if (validator.rightStateFieldPathExpression      &&
                 validator.rightStateFieldPathExpressionValid) {


          Object mapping = helper.resolveMapping(rightExpression);


          // The path expression cannot be a non-basic mapping
          if ((mapping != null) && !helper.isPropertyMapping(mapping)) {


            addProblem(
              rightExpression,
              ComparisonExpression_AssociationField,
              rightExpression.toActualText(),
              expression.getComparisonOperator()
            );


            valid = false;
          }
        }
      }
      // '=', '<>'
      else {


        // The left expression is an identification variable
        // The right expression is a path expression
        if (validator.leftIdentificationVariable      &&
            validator.leftIdentificationVariableValid &&
            validator.rightStateFieldPathExpression   &&
            validator.rightStateFieldPathExpressionValid) {


          Object mapping = helper.resolveMapping(rightExpression);
          IdentificationVariable variable = (IdentificationVariable) leftExpression;


          // The path expression can only be a non-basic mapping.
          // There is a specific EclipseLink case where it is valid to use an
          // identification variable, which is when the identification variable
          // maps to a direct collection mapping
          if ((mapping != null) && helper.isPropertyMapping(mapping) &&
              !isIdentificationVariableValidInComparison(variable)) {


            addProblem(
              rightExpression,
              ComparisonExpression_BasicField,
              rightExpression.toActualText(),
              expression.getComparisonOperator()
            );


            valid = false;
          }
        }
        // The left expression is a path expression
        // The right expression is an identification variable
        else if (validator.rightIdentificationVariable      &&
                 validator.rightIdentificationVariableValid &&
                 validator.leftStateFieldPathExpression     &&
                 validator.leftStateFieldPathExpressionValid) {


          Object mapping = helper.resolveMapping(leftExpression);
          IdentificationVariable variable = (IdentificationVariable) rightExpression;


          // The path expression can only be a non-basic mapping.
          // There is a specific EclipseLink case where it is valid to use an
          // identification variable, which is when the identification variable
          // maps to a direct collection mapping

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    DeclarationResolver declarationResolver = queryContext.getDeclarationResolverImp();


    for (Declaration declaration : declarationResolver.getDeclarations()) {


      // Register the identification variable from the base expression
      IdentificationVariable identificationVariable = declaration.getIdentificationVariable();
      addIdentificationVariable(identificationVariable, identificationVariables);


      // Register the identification variable from the JOIN expressions
      for (Join join : declaration.getJoins()) {
        IdentificationVariable joinIdentificationVariable = getIdentificationVariable(join.getIdentificationVariable());
        addIdentificationVariable(joinIdentificationVariable, identificationVariables);
      }
    }


    if (queryContext.getParent() == null) {

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


    IdentificationVariable variable = (IdentificationVariable) expression.getIdentificationVariable();
    Declaration declaration = queryContext.getDeclaration(variable.getVariableName());


    switch (declaration.getType()) {


      // If the Declaration is RangeDeclaration, then retrieve its Descriptor directly,
      // this will support two cases automatically, the "root" object is

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   */
  @Override
  public void visit(ResultVariable expression) {


    expression.getSelectExpression().accept(this);
    IdentificationVariable identificationVariable = (IdentificationVariable) expression.getResultVariable();
    String variableName = identificationVariable.getVariableName();
    queryContext.addQueryExpression(variableName, queryExpression);


    // Note: The type will be calculated when traversing the select expression
  }

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


      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();
      String variableName = identificationVariable.getVariableName();


      // Retrieve the Expression for the identification variable
      declaration = queryContext.findDeclaration(variableName);
      declaration.getBaseExpression().accept(ExpressionBuilderVisitor.this);
      localExpression = queryExpression;

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org.eclipse.persistence.internal.jpa.jpql.AbstractReadAllQueryVisitor$JoinVisitor

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