EclipseLink 2.4.2, build 'v20130514-5956486' API Reference

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

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

public final class SelectStatement
extends AbstractSelectStatement

A select statement must always have a SELECT and a FROM clause.

JPA:

BNF: select_statement ::= select_clause from_clause [where_clause] [groupby_clause] [having_clause] [orderby_clause]

EclipseLink 2.4:

BNF: select_statement ::= select_clause from_clause [where_clause] [groupby_clause] [having_clause] [orderby_clause] {union_clause}*

Version:
2.4.2
See Also:
SelectClause
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
SelectStatement(AbstractExpression parent)
          Creates a new SelectStatement.
 
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.
protected  FromClause buildFromClause()
          Creates the expression representing the from clause of this select statement.
protected  SelectClause buildSelectClause()
          Creates the expression representing the select clause of this select statement.
 JPQLQueryBNF findQueryBNF(Expression expression)
          Retrieves the JPQLQueryBNF that represents the fragment of this Expression that was used when parsing the given Expression.
 Expression getOrderByClause()
          Returns the Expression representing the ORDER BY clause.
 JPQLQueryBNF getQueryBNF()
          Returns the BNF of this Expression.
 SelectClause getSelectClause()
          Returns the AbstractSelectClause representing the SELECT clause.
 Expression getUnionClauses()
          Returns the Expression representing the UNION clauses.
 boolean hasOrderByClause()
          Determines whether the ORDER BY clause is defined.
 boolean hasSpaceBeforeOrderBy()
          Determines whether a whitespace was parsed before the ORDER BY clause.
 boolean hasSpaceBeforeUnion()
          Determines whether a whitespace was parsed before the UNION clause.
 boolean hasUnionClauses()
          Determines whether at least one UNION clause was defined.
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  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.AbstractSelectStatement
addSelectClause, getFromClause, getGroupByClause, getHavingClause, getWhereClause, hasFromClause, hasGroupByClause, hasHavingClause, hasSpaceAfterFrom, hasSpaceAfterGroupBy, hasSpaceAfterSelect, hasSpaceAfterWhere, hasWhereClause, shouldManageSpaceAfterClause
 
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, shouldSkipLiteral, toActualText, toParsedText, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

SelectStatement

public SelectStatement(AbstractExpression parent)
Creates a new SelectStatement.

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.

Specified by:
acceptChildren in interface Expression
Overrides:
acceptChildren in class AbstractSelectStatement
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 AbstractSelectStatement
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 AbstractSelectStatement
Parameters:
children - The list used to store the string representation of this AbstractExpression

buildFromClause

protected FromClause buildFromClause()
Creates the expression representing the from clause of this select statement.

Specified by:
buildFromClause in class AbstractSelectStatement
Returns:
A new from clause, null can't be returned

buildSelectClause

protected SelectClause buildSelectClause()
Creates the expression representing the select clause of this select statement.

Specified by:
buildSelectClause in class AbstractSelectStatement
Returns:
A new from clause, null can't be returned

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 AbstractSelectStatement
Parameters:
expression - The Expression that is a descendant of this one
Returns:
The JPQLQueryBNF that was used to parse the given expression

getOrderByClause

public Expression getOrderByClause()
Returns the Expression representing the ORDER BY clause.

Returns:
The expression representing the ORDER BY clause

getQueryBNF

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

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

getSelectClause

public SelectClause getSelectClause()
Returns the AbstractSelectClause representing the SELECT clause.

Overrides:
getSelectClause in class AbstractSelectStatement
Returns:
The expression representing the SELECT clause

getUnionClauses

public Expression getUnionClauses()
Returns the Expression representing the UNION clauses.

Returns:
The Expression representing the UNION clauses

hasOrderByClause

public boolean hasOrderByClause()
Determines whether the ORDER BY clause is defined.

Returns:
true if the query that got parsed had the ORDER BY clause

hasSpaceBeforeOrderBy

public boolean hasSpaceBeforeOrderBy()
Determines whether a whitespace was parsed before the ORDER BY clause. In some cases, the space could be owned by a child of the previous clause.

Returns:
true if there was a whitespace before the ORDER BY; false otherwise

hasSpaceBeforeUnion

public boolean hasSpaceBeforeUnion()
Determines whether a whitespace was parsed before the UNION clause. In some cases, the space could be owned by a child of the previous clause.

Returns:
true if there was a whitespace before the UNION; false otherwise

hasUnionClauses

public boolean hasUnionClauses()
Determines whether at least one UNION clause was defined.

Returns:
true if the query that got parsed had the UNION clauses

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.

Overrides:
parse in class AbstractSelectStatement
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

toParsedText

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

Overrides:
toParsedText in class AbstractSelectStatement
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