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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.ConstructorExpression
public final class ConstructorExpression
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.
constructor_expression ::= NEW constructor_name(constructor_item {, constructor_item}*)
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression |
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COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE |
Constructor Summary | |
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ConstructorExpression(AbstractExpression parent)
Creates a new ConstructorExpression . |
Method Summary | |
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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 java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ConstructorExpression(AbstractExpression parent)
ConstructorExpression
.
parent
- The parent of this expressionMethod Detail |
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public void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.
visitor
- The ExpressionVisitor
to visit this objectpublic void acceptChildren(ExpressionVisitor visitor)
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.
visitor
- The visitor
to visit the children of this object.protected void addChildrenTo(java.util.Collection<Expression> children)
AbstractExpression
to the given collection.
addChildrenTo
in class AbstractExpression
children
- The collection used to store the childrenprotected void addOrderedChildrenTo(java.util.List<Expression> children)
AbstractExpression
to the given list.
addOrderedChildrenTo
in class AbstractExpression
children
- The list used to store the string representation of this AbstractExpression
public CollectionExpression buildCollectionExpression()
CollectionExpression
that will wrap the single constructor item.
public JPQLQueryBNF findQueryBNF(Expression expression)
JPQLQueryBNF
that represents the fragment of this Expression
that was used when parsing the given Expression
.
findQueryBNF
in interface Expression
findQueryBNF
in class AbstractExpression
expression
- The Expression
that is a descendant of this one
JPQLQueryBNF
that was used to parse the given expressionpublic java.lang.String getActualIdentifier()
public java.lang.String getClassName()
public Expression getConstructorItems()
null
" expressionpublic JPQLQueryBNF getQueryBNF()
Expression
.
JPQLQueryBNF
, which represents the grammar of this Expression
public boolean hasConstructorItems()
true
if the query had at least one constructor item; false
otherwisepublic boolean hasLeftParenthesis()
true
if the open parenthesis was present in the string version of the
query; false
otherwisepublic boolean hasRightParenthesis()
true
if the close parenthesis was present in the string version of the
query; false
otherwisepublic boolean hasSpaceAfterNew()
true
if there was a whitespace after NEW; false
otherwiseprotected boolean isParsingComplete(WordParser wordParser, java.lang.String word, Expression expression)
isParsingComplete
in class AbstractExpression
wordParser
- The text to parse based on the current position of the cursorword
- The word that was retrieved from the given text, which is the first word in the textexpression
- The Expression
that has already been parsed
true
if the text no longer can't be parsed by the current expression;
false
if more can be parsedprotected void parse(WordParser wordParser, boolean tolerant)
WordParser
.
parse
in class AbstractExpression
wordParser
- The text to parse based on the current position of the cursortolerant
- Determines whether the parsing system should be tolerant, meaning if it should
try to parse invalid or incomplete queriesprotected boolean shouldSkipLiteral(AbstractExpression expression)
shouldSkipLiteral
in class AbstractExpression
expression
- The Expression
that has just been parsed or null
true
protected void toParsedText(java.lang.StringBuilder writer, boolean actual)
Expression
, including its children,
if it has any.
toParsedText
in class AbstractExpression
writer
- The buffer used to append this Expression
's string representationactual
- 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
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