Class AggregateConditionExp

java.lang.Object

org.apache.cayenne.exp.Expression

org.apache.cayenne.exp.AggregateConditionExp

All Implemented Interfaces:

XMLSerializable

Direct Known Subclasses:

AndExp, NotExp, OrExp, WhenExp

public abstract sealed class AggregateConditionExp
extends Expression
permits AndExp, NotExp, OrExp, WhenExp

Superclass of aggregated conditional nodes such as NOT, AND, OR. Performs extra checks on parent and child expressions to validate conditions that are not addressed in the Cayenne expressions grammar.

Since:

5.0

Field Summary

Fields inherited from class Expression

operands, PRUNED_NODE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AggregateConditionExp(Object... operands)

Method Summary

Modifier and Type	Method	Description
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 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).
protected boolean	pruneNodeForPrunedChild(Object prunedChild)	Returns true if this node should be pruned from expression tree in the event a child is removed.
void	setOperand(int index, Object value)	Sets a value of operand at index, growing the operands array if needed.
protected Object	transformExpression(Function<Object,Object> transformer)	A recursive method called from "transform" to do the actual transformation.

Methods inherited from class Expression

andExp, andExp, appendAsString, appendOperandAsString, deepCopy, encodeAsXML, equals, evaluate, evaluateNode, evaluateOperand, expName, filter, filterObjects, first, flattenTree, getExpressionOperator, getOperand, getOperandCount, getPathAliases, hashCode, match, notExp, orExp, orExp, params, params, paramsArray, parenthesizeAsOperand, setOperands, shallowCopy, toString, transform, traverse, traverse

Methods inherited from class Object

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

Constructor Details

AggregateConditionExp

protected AggregateConditionExp(Object... operands)

Method Details

pruneNodeForPrunedChild

protected boolean pruneNodeForPrunedChild(Object prunedChild)

Description copied from class: Expression

Returns true if this node should be pruned from expression tree in the event a child is removed.

Overrides:

pruneNodeForPrunedChild in class Expression

transformExpression

protected Object transformExpression(Function<Object,Object> transformer)

Description copied from class: Expression

A recursive method called from "transform" to do the actual transformation.

Overrides:

transformExpression in class Expression

Returns:

null, Expression.PRUNED_NODE or transformed 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 Expression

setOperand

public void setOperand(int index,
 Object value)

Description copied from class: Expression

Sets a value of operand at index, growing the operands array if needed. Operand indexing starts at 0. A Persistent is replaced with its ObjectId. A nested expression is asked first whether this node is a valid parent for it, see Expression.isValidParent(Expression).

Overrides:

setOperand in class Expression

exists

public Expression exists()

Description copied from class: Expression

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 Expression

Returns:

exists expression

See Also:

• ExpressionFactory.exists(Expression)

notExists

public Expression notExists()

Description copied from class: Expression

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 Expression

Returns:

not exists expression

See Also:

• ExpressionFactory.notExists(Expression)