Class ExistsExp

java.lang.Object

org.apache.cayenne.exp.Expression

org.apache.cayenne.exp.ConditionExp

org.apache.cayenne.exp.ExistsExp

All Implemented Interfaces:

XMLSerializable

public final class ExistsExp
extends ConditionExp

Since:

5.0

Field Summary

Fields inherited from class Expression

operands, PRUNED_NODE

Constructor Summary

Constructors

Constructor	Description
ExistsExp(Object... operands)

Method Summary

Modifier and Type	Method	Description
void	appendAsString(Appendable out)	Appends own content as a String to the provided Appendable: the operands separated by the operator.
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)	Returns the operator printed between the operands, before the operand at the given index.
protected int	getRequiredChildrenCount()
protected boolean	isValidParent(Expression parent)	Whether this node can be an operand of the given node.
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 Expression

andExp, andExp, appendOperandAsString, deepCopy, encodeAsXML, equals, evaluate, evaluateOperand, expName, filter, filterObjects, first, flattenTree, getOperand, getOperandCount, getPathAliases, hashCode, match, notExp, orExp, orExp, params, params, paramsArray, parenthesizeAsOperand, pruneNodeForPrunedChild, setOperand, setOperands, toString, transform, transformExpression, traverse, traverse

Methods inherited from class Object

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

Constructor Details

ExistsExp

public ExistsExp(Object... operands)

Method Details

getRequiredChildrenCount

protected int getRequiredChildrenCount()

Specified by:

getRequiredChildrenCount in class ConditionExp

evaluateNode

protected Object evaluateNode(Object o)
                       throws Exception

Description copied from class: Expression

Evaluates itself with object, pushing result on the stack.

Overrides:

evaluateNode in class ConditionExp

Throws:

Exception

evaluateSubNode

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

Specified by:

evaluateSubNode in class ConditionExp

Throws:

Exception

appendAsString

public void appendAsString(Appendable out)
                    throws IOException

Description copied from class: Expression

Appends own content as a String to the provided Appendable: the operands separated by the operator.

Overrides:

appendAsString in class Expression

Throws:

IOException

getExpressionOperator

protected String getExpressionOperator(int index)

Description copied from class: Expression

Returns the operator printed between the operands, before the operand at the given index.

Specified by:

getExpressionOperator in class Expression

isValidParent

protected boolean isValidParent(Expression parent)

Description copied from class: Expression

Whether this node can be an operand of the given node. Called by the parent when the operand is set, to check what the grammar can't: e.g. a condition can only be an operand of a condition aggregate. By default any parent is valid.

Overrides:

isValidParent in class ConditionExp

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

exists

public Expression exists()

Description copied from class: ConditionExp

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 ConditionExp

Returns:

exists expression

See Also:

• ExpressionFactory.exists(Expression)

notExists

public Expression notExists()

Description copied from class: ConditionExp

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 ConditionExp

Returns:

not exists expression

See Also:

• ExpressionFactory.notExists(Expression)