Class TrueExp

java.lang.Object

org.apache.cayenne.exp.Expression

org.apache.cayenne.exp.ConditionExp

org.apache.cayenne.exp.TrueExp

All Implemented Interfaces:

XMLSerializable

public final class TrueExp
extends ConditionExp

Boolean true expression element Notice that there is one TrueExp and one FalseExp instead of a single BooleanExp with a Boolean value. The main reason for doing this is that a common BooleanExp will have operand count of 1 and that will default to a prepared statmenet like " where ? and (...)", but we only need " where true and (...)".

Since:

5.0

See Also:

• FalseExp

Field Summary

Fields inherited from class Expression

operands, PRUNED_NODE

Constructor Summary

Constructors

Constructor	Description
TrueExp(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 Boolean	evaluateSubNode(Object o, Object[] evaluatedChildren)
protected String	getExpressionOperator(int index)	Returns the operator printed between the operands, before the operand at the given index.
protected int	getRequiredChildrenCount()
protected boolean	parenthesizeAsOperand()	Whether this node is wrapped in parentheses when printed as an operand of another node.
Expression	shallowCopy()	Creates a copy of this expression node, without copying children.

Methods inherited from class ConditionExp

evaluateNode, exists, isValidParent, notExists

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, pruneNodeForPrunedChild, setOperand, setOperands, toString, transform, transformExpression, traverse, traverse

Methods inherited from class Object

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

Constructor Details

TrueExp

public TrueExp(Object... operands)

Method Details

getRequiredChildrenCount

protected int getRequiredChildrenCount()

Specified by:

getRequiredChildrenCount in class ConditionExp

evaluateSubNode

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

Specified by:

evaluateSubNode in class ConditionExp

Throws:

Exception

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

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

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

parenthesizeAsOperand

protected boolean parenthesizeAsOperand()

Description copied from class: Expression

Whether this node is wrapped in parentheses when printed as an operand of another node. Compound nodes are, leaves and nodes with their own delimiters (function calls, lists) are not.

Overrides:

parenthesizeAsOperand in class Expression