Field Detail

• SELECT_ITEM_PROPERTY

  public static final String SELECT_ITEM_PROPERTY

  Notifies the select expression property has changed.

  See Also:

  Constant Field Values

Constructor Detail

• SimpleSelectClauseStateObject

  public SimpleSelectClauseStateObject​(SimpleSelectStatementStateObject parent)

  Creates a new SubQuerySelectClauseStateObject.

  Parameters:

  parent - The parent of this state object, which cannot be null

  Throws:

  NullPointerException - The given parent cannot be null

Method Detail

• accept

  public void accept​(StateObjectVisitor visitor)

  Visits this StateObject by the given visitor.

  Parameters:

  visitor - The visitor to visit this object

• getBuilder

  public ISimpleSelectExpressionStateObjectBuilder getBuilder()

  Creates and returns a new ISimpleSelectExpressionStateObjectBuilder that can be used to programmatically create a single select expression and once the expression is complete, ISimpleSelectExpressionStateObjectBuilder.commit() will push the StateObject representation of that expression as this clause's select expression.

  Returns:

  A new builder that can be used to quickly create a select expression

• getExpression

  public SimpleSelectClause getExpression()

  Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.

  Specified by:

  getExpression in interface StateObject

  Overrides:

  getExpression in class AbstractSelectClauseStateObject

  Returns:

  The parsed object when a JPQL query is parsed and converted into a StateObject or null when the JPQL query is manually created (i.e. not from a string)

• getFromClause

  public SimpleFromClauseStateObject getFromClause()

  Returns the AbstractFromClauseStateObject representing the FROM clause.

  Overrides:

  getFromClause in class AbstractSelectClauseStateObject

  Returns:

  The state object representing the FROM clause

• getParent

  public SimpleSelectStatementStateObject getParent()

  Returns the parent of this StateObject.

  Specified by:

  getParent in interface StateObject

  Overrides:

  getParent in class AbstractSelectClauseStateObject

  Returns:

  Returns the parent of this StateObject, which is null only when this is the root of the hierarchy

• getSelectItem

  public StateObject getSelectItem()

  Returns

  Returns:

• hasSelectItem

  public boolean hasSelectItem()

  Determines whether this SELECT clause has a select item defined (only one can be set for a subquery's SELECT clause and many for a top-level query).

  Specified by:

  hasSelectItem in class AbstractSelectClauseStateObject

  Returns:

  true if this state object has children; false otherwise

• isEquivalent

  public boolean isEquivalent​(StateObject stateObject)

  Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.

  Specified by:

  isEquivalent in interface StateObject

  Overrides:

  isEquivalent in class AbstractSelectClauseStateObject

  Parameters:

  stateObject - The StateObject to compare its content to this one

  Returns:

  true if both object are equivalent; false otherwise

• parse

  public void parse​(String jpqlFragment)

  Parses the given JPQL fragment and create the select item. For the top-level query, the fragment can contain several select items but for a subquery, it can represent only one.

  Specified by:

  parse in class AbstractSelectClauseStateObject

  Parameters:

  jpqlFragment - The portion of the query representing one or several select items

• setExpression

  public void setExpression​(SimpleSelectClause expression)

  Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.

  Parameters:

  expression - The parsed object representing a subquery SELECT clause

• setSelectItem

  public void setSelectItem​(StateObject stateObject)

  Sets the given StateObject as this clause's select item.

  Parameters:

  stateObject - The StateObject representing the single select item