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

      resolvers.put(internalVariableName, resolver);


      Declaration declaration = new Declaration();
      declaration.rangeDeclaration       = true;
      declaration.rootPath               = entityName;
      declaration.identificationVariable = new IdentificationVariable(null, variableName);
      declaration.lockData();
      declarations.add(declaration);
    }
  }

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      return Collections.unmodifiableSet(variables);
    }


    protected Map.Entry<Join, String> buildMapEntry(Map.Entry<Join, IdentificationVariable> entry) {
      IdentificationVariable variable = entry.getValue();
      String variableName = (variable != null) ? variable.getText() : ExpressionTools.EMPTY_STRING;
      return new SimpleEntry(entry.getKey(), variableName);
    }

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    DeclarationResolver declarationResolver = queryContext.getDeclarationResolverImp();


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


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


      // Register the identification variable from the JOIN expressions
      for (IdentificationVariable joinIdentificationVariable : declaration.joins.values()) {
        addIdentificationVariable(joinIdentificationVariable, identificationVariables);

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


      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();


      // Create the Expression for the identification variable
      identificationVariable.accept(ExpressionBuilderVisitor.this);
      localExpression = new MapEntryExpression(queryExpression);


      // Retrieve the mapping's key mapping's descriptor
      descriptor = queryContext.resolveDescriptor(expression);
    }

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


      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();


      // Create the Expression for the identification variable
      identificationVariable.accept(ExpressionBuilderVisitor.this);
      localExpression = queryExpression;


      // Retrieve the mapping's reference descriptor
      declaration = queryContext.findDeclaration(identificationVariable.getVariableName());
      descriptor = declaration.getDescriptor();
    }

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  /**
   * {@inheritDoc}
   */
  @Override
  public void visit(KeyExpression expression) {
    IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();
    Declaration declaration = queryContext.findDeclaration(identificationVariable.getVariableName());
    DatabaseMapping mapping = declaration.getMapping();
    MappedKeyMapContainerPolicy mapContainerPolicy = (MappedKeyMapContainerPolicy) mapping.getContainerPolicy();
    type = (Class<?>) mapContainerPolicy.getKeyType();
  }

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


    IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();
    Declaration declaration = queryContext.findDeclaration(identificationVariable.getVariableName());
    DatabaseMapping mapping = declaration.getMapping();


    if (mapping.isDirectMapMapping()) {


      DirectMapMapping mapMapping = (DirectMapMapping) mapping;

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     * {@link InputParameter}
     */
    @Override
    public void visit(KeyExpression expression) {


      IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression();
      Declaration declaration = queryContext.getDeclaration(identificationVariable.getVariableName());
      DatabaseMapping mapping = declaration.getMapping();


      ContainerPolicy containerPolicy = mapping.getContainerPolicy();
      MappedKeyMapContainerPolicy mapPolicy = (MappedKeyMapContainerPolicy) containerPolicy;
      descriptor = mapPolicy.getKeyMapping().getReferenceDescriptor();

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