EclipseLink 2.4.2, build 'v20130514-5956486' API Reference

org.eclipse.persistence.jpa.jpql.parser
Class ConstructorExpression

java.lang.Object
  extended by org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
      extended by org.eclipse.persistence.jpa.jpql.parser.ConstructorExpression
All Implemented Interfaces:
Expression

public final class ConstructorExpression
extends AbstractExpression

In the SELECT clause a constructor may be used in the SELECT list to return one or more Java instances. The specified class is not required to be an entity or to be mapped to the database. The constructor name must be fully qualified.

BNF: constructor_expression ::= NEW constructor_name(constructor_item {, constructor_item}*)

Version:
2.4.2
Author:
Pascal Filion
Since:
2.3

Field Summary
 
Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE
 
Fields inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression
ABS, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXTRACT, FALSE, FETCH, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, REGEXP, SELECT, SET, SIZE, SOME, SQL, SQRT, SUBSTRING, SUM, TABLE, THEN, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE
 
Constructor Summary
ConstructorExpression(AbstractExpression parent)
          Creates a new ConstructorExpression.
 
Method Summary
 void accept(ExpressionVisitor visitor)
          Visits this Expression by the given visitor.
 void acceptChildren(ExpressionVisitor visitor)
          Visits the children of this Expression.
protected  void addChildrenTo(java.util.Collection<Expression> children)
          Adds the children of this AbstractExpression to the given collection.
protected  void addOrderedChildrenTo(java.util.List<Expression> children)
          Adds the children of this AbstractExpression to the given list.
 CollectionExpression buildCollectionExpression()
          Creates a new CollectionExpression that will wrap the single constructor item.
 JPQLQueryBNF findQueryBNF(Expression expression)
          Retrieves the JPQLQueryBNF that represents the fragment of this Expression that was used when parsing the given Expression.
 java.lang.String getActualIdentifier()
          Returns the actual NEW identifier found in the string representation of the JPQL query, which has the actual case that was used.
 java.lang.String getClassName()
          Returns the fully qualified class name that will be used to retrieve the constructor.
 Expression getConstructorItems()
          Returns the constructor items aggregated into a single expression and separated by commas or a single expression.
 JPQLQueryBNF getQueryBNF()
          Returns the BNF of this Expression.
 boolean hasConstructorItems()
          Determines whether the constructor items were parsed.
 boolean hasLeftParenthesis()
          Determines whether the open parenthesis was parsed or not.
 boolean hasRightParenthesis()
          Determines whether the close parenthesis was parsed or not.
 boolean hasSpaceAfterNew()
          Determines whether a whitespace was parsed after NEW.
protected  boolean isParsingComplete(WordParser wordParser, java.lang.String word, Expression expression)
          Determines whether the parsing is complete based on what is left in the given text.
protected  void parse(WordParser wordParser, boolean tolerant)
          Parses the query by starting at the current position, which is part of the given WordParser.
protected  boolean shouldSkipLiteral(AbstractExpression expression)
          When parsing an invalid or incomplete query, it is possible two literals would be parsed but in some cases, a CollectionExpression should not be created and the parsing should actually stop here.
protected  void toParsedText(java.lang.StringBuilder writer, boolean actual)
          Generates a string representation of this Expression, including its children, if it has any.
 
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
acceptUnknownVisitor, acceptUnknownVisitor, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, getText, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, toActualText, toParsedText, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ConstructorExpression

public ConstructorExpression(AbstractExpression parent)
Creates a new ConstructorExpression.

Parameters:
parent - The parent of this expression
Method Detail

accept

public void accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor.

Parameters:
visitor - The ExpressionVisitor to visit this object

acceptChildren

public void acceptChildren(ExpressionVisitor visitor)
Visits the children of this Expression. This method can be used to optimize traversing the children since a new list is not created every time Expression.children() is called.

This does not traverse the Expression sub-hierarchy, use a subclass of AbstractTraverseChildrenVisitor in order to traverse the entire sub-hierarchy.

Parameters:
visitor - The visitor to visit the children of this object.

addChildrenTo

protected void addChildrenTo(java.util.Collection<Expression> children)
Adds the children of this AbstractExpression to the given collection.

Overrides:
addChildrenTo in class AbstractExpression
Parameters:
children - The collection used to store the children

addOrderedChildrenTo

protected void addOrderedChildrenTo(java.util.List<Expression> children)
Adds the children of this AbstractExpression to the given list.

Overrides:
addOrderedChildrenTo in class AbstractExpression
Parameters:
children - The list used to store the string representation of this AbstractExpression

buildCollectionExpression

public CollectionExpression buildCollectionExpression()
Creates a new CollectionExpression that will wrap the single constructor item.

Returns:
The single constructor item represented by a temporary collection

findQueryBNF

public JPQLQueryBNF findQueryBNF(Expression expression)
Retrieves the JPQLQueryBNF that represents the fragment of this Expression that was used when parsing the given Expression.

Specified by:
findQueryBNF in interface Expression
Overrides:
findQueryBNF in class AbstractExpression
Parameters:
expression - The Expression that is a descendant of this one
Returns:
The JPQLQueryBNF that was used to parse the given expression

getActualIdentifier

public java.lang.String getActualIdentifier()
Returns the actual NEW identifier found in the string representation of the JPQL query, which has the actual case that was used.

Returns:
The NEW identifier that was actually parsed

getClassName

public java.lang.String getClassName()
Returns the fully qualified class name that will be used to retrieve the constructor.

Returns:
The fully qualified class name or an empty string if it is not defined

getConstructorItems

public Expression getConstructorItems()
Returns the constructor items aggregated into a single expression and separated by commas or a single expression.

Returns:
The constructor item or items or an invalid or "null" expression

getQueryBNF

public JPQLQueryBNF getQueryBNF()
Returns the BNF of this Expression.

Returns:
The JPQLQueryBNF, which represents the grammar of this Expression

hasConstructorItems

public boolean hasConstructorItems()
Determines whether the constructor items were parsed.

Returns:
true if the query had at least one constructor item; false otherwise

hasLeftParenthesis

public boolean hasLeftParenthesis()
Determines whether the open parenthesis was parsed or not.

Returns:
true if the open parenthesis was present in the string version of the query; false otherwise

hasRightParenthesis

public boolean hasRightParenthesis()
Determines whether the close parenthesis was parsed or not.

Returns:
true if the close parenthesis was present in the string version of the query; false otherwise

hasSpaceAfterNew

public boolean hasSpaceAfterNew()
Determines whether a whitespace was parsed after NEW.

Returns:
true if there was a whitespace after NEW; false otherwise

isParsingComplete

protected boolean isParsingComplete(WordParser wordParser,
                                    java.lang.String word,
                                    Expression expression)
Determines whether the parsing is complete based on what is left in the given text. The text is never empty.

Overrides:
isParsingComplete in class AbstractExpression
Parameters:
wordParser - The text to parse based on the current position of the cursor
word - The word that was retrieved from the given text, which is the first word in the text
expression - The Expression that has already been parsed
Returns:
true if the text no longer can't be parsed by the current expression; false if more can be parsed

parse

protected void parse(WordParser wordParser,
                     boolean tolerant)
Parses the query by starting at the current position, which is part of the given WordParser.

Specified by:
parse in class AbstractExpression
Parameters:
wordParser - The text to parse based on the current position of the cursor
tolerant - Determines whether the parsing system should be tolerant, meaning if it should try to parse invalid or incomplete queries

shouldSkipLiteral

protected boolean shouldSkipLiteral(AbstractExpression expression)
When parsing an invalid or incomplete query, it is possible two literals would be parsed but in some cases, a CollectionExpression should not be created and the parsing should actually stop here. Example: BETWEEN 10 20, when parsing 20, it should not be parsed as part of the lower bound expression.

Overrides:
shouldSkipLiteral in class AbstractExpression
Parameters:
expression - The Expression that has just been parsed or null
Returns:
true

toParsedText

protected void toParsedText(java.lang.StringBuilder writer,
                            boolean actual)
Generates a string representation of this Expression, including its children, if it has any.

Specified by:
toParsedText in class AbstractExpression
Parameters:
writer - The buffer used to append this Expression's string representation
actual - Determines whether the string representation should represent what was parsed, i.e. include any "virtual" whitespace (such as ending whitespace) and the actual case of the JPQL identifiers

EclipseLink 2.4.2, build 'v20130514-5956486' API Reference