Class ASTExists

java.lang.Object

org.apache.cayenne.exp.Expression

org.apache.cayenne.exp.parser.SimpleNode

org.apache.cayenne.exp.parser.ConditionNode

org.apache.cayenne.exp.parser.ASTExists

All Implemented Interfaces:

Serializable, Node, XMLSerializable

public class ASTExists
extends ConditionNode

Since:

4.2

See Also:

• Serialized Form

Field Summary

Fields inherited from class SimpleNode

children, id, parent

Fields inherited from class Expression

ADD, ALL, AND, ANY, ASTERISK, BETWEEN, BITWISE_AND, BITWISE_LEFT_SHIFT, BITWISE_NOT, BITWISE_OR, BITWISE_RIGHT_SHIFT, BITWISE_XOR, CASE_WHEN, CUSTOM_OP, DB_PATH, DBID_PATH, DIVIDE, ELSE, ENCLOSING_OBJECT, EQUAL_TO, EXISTS, FALSE, FULL_OBJECT, FUNCTION_CALL, GREATER_THAN, GREATER_THAN_EQUAL_TO, IN, LESS_THAN, LESS_THAN_EQUAL_TO, LIKE, LIKE_IGNORE_CASE, LIST, MULTIPLY, NEGATIVE, NOT, NOT_BETWEEN, NOT_EQUAL_TO, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_LIKE_IGNORE_CASE, OBJ_PATH, OR, PRUNED_NODE, SCALAR, SUBQUERY, SUBTRACT, THEN, TRUE, type, WHEN

Constructor Summary

Constructors

Constructor	Description
ASTExists(Expression expression)

Method Summary

Modifier and Type	Method	Description
protected Object	evaluateNode(Object o)	Evaluates itself with object, pushing result on the stack.
protected Boolean	evaluateSubNode(Object o, Object[] evaluatedChildren)
Expression	exists()	Returns expression that will be dynamically resolved to proper subqueries based on a relationships used (if no relationships are present in the original expression no subqueries will be used).
protected String	getExpressionOperator(int index)
protected int	getRequiredChildrenCount()
int	getType()	Returns a type of expression.
protected boolean	isValidParent(Node n)	Additional parent check that we can't handle properly in the grammar By default it just returns true.
void	jjtAddChild(Node n, int i)	This method tells the node to add its argument to the node's list of children.
void	jjtSetParent(Node n)	This pair of methods are used to inform the node of its parent.
Expression	notExists()	Returns expression that will be dynamically resolved to proper subqueries based on a relationships used (if no relationships are present in the original expression no subqueries will be used).
Expression	shallowCopy()	Creates a copy of this expression node, without copying children.

Methods inherited from class SimpleNode

appendAsEJBQL, appendAsEJBQL, appendAsEscapedString, appendAsString, appendChildrenAsEJBQL, appendScalarAsString, connectChildren, encodeScalarAsEJBQL, evaluate, evaluateChild, expName, flattenTree, getEJBQLExpressionOperator, getOperand, getOperandCount, getPathAliases, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, notExp, numericToString, pruneNodeForPrunedChild, setOperand, unwrapChild, wrapChild

Methods inherited from class Expression

andExp, andExp, deepCopy, encodeAsXML, equals, filter, filterObjects, first, hashCode, joinExp, joinExp, match, orExp, orExp, params, params, paramsArray, setType, toEJBQL, toEJBQL, toString, transform, transformExpression, traverse, traverse

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ASTExists

public ASTExists(Expression expression)

Method Details

getRequiredChildrenCount

protected int getRequiredChildrenCount()

Specified by:

getRequiredChildrenCount in class ConditionNode

evaluateNode

protected Object evaluateNode(Object o)
                       throws Exception

Description copied from class: SimpleNode

Evaluates itself with object, pushing result on the stack.

Overrides:

evaluateNode in class ConditionNode

Throws:

Exception

evaluateSubNode

protected Boolean evaluateSubNode(Object o,
 Object[] evaluatedChildren)
                           throws Exception

Specified by:

evaluateSubNode in class ConditionNode

Throws:

Exception

getExpressionOperator

protected String getExpressionOperator(int index)

Specified by:

getExpressionOperator in class SimpleNode

isValidParent

protected boolean isValidParent(Node n)

Description copied from class: SimpleNode

Additional parent check that we can't handle properly in the grammar By default it just returns true.

Overrides:

isValidParent in class ConditionNode

Parameters:

n - potential parent node to check

Returns:

true if node could be set as a parent for the current node

jjtSetParent

public void jjtSetParent(Node n)

Description copied from interface: Node

This pair of methods are used to inform the node of its parent.

Specified by:

jjtSetParent in interface Node

Overrides:

jjtSetParent in class SimpleNode

jjtAddChild

public void jjtAddChild(Node n,
 int i)

Description copied from interface: Node

This method tells the node to add its argument to the node's list of children.

Specified by:

jjtAddChild in interface Node

Overrides:

jjtAddChild in class SimpleNode

shallowCopy

public Expression shallowCopy()

Description copied from class: Expression

Creates a copy of this expression node, without copying children.

Specified by:

shallowCopy in class Expression

getType

public int getType()

Description copied from class: Expression

Returns a type of expression. Most common types are defined as public static fields of this interface.

Overrides:

getType in class Expression

exists

public Expression exists()

Description copied from class: ConditionNode

Returns expression that will be dynamically resolved to proper subqueries based on a relationships used (if no relationships are present in the original expression no subqueries will be used).

Overrides:

exists in class ConditionNode

Returns:

exists expression

See Also:

• ExpressionFactory.exists(Expression)

notExists

public Expression notExists()

Description copied from class: ConditionNode

Returns expression that will be dynamically resolved to proper subqueries based on a relationships used (if no relationships are present in the original expression no subqueries will be used).

Overrides:

notExists in class ConditionNode

Returns:

not exists expression

See Also:

• ExpressionFactory.notExists(Expression)