org.treetank.service.xml.xpath.expr

Class AndExpr

java.lang.Object

org.treetank.axis.AbsAxis

org.treetank.service.xml.xpath.expr.AbsExpression

org.treetank.service.xml.xpath.expr.AndExpr

All Implemented Interfaces:

Iterable<Long>, Iterator<Long>

public class AndExpr
extends AbsExpression

Logical And Expression

The logical and expression performs a logical conjunction of the boolean values of two input sequences. If a logical expression does not raise an error, its value is always one of the boolean values true or false.

The value of an and-expression is determined by the effective boolean values of its operands, as shown in the following table:

AND	EBV2 = true	EBV2 = false	error in EBV2
EBV1 = true	true	false	error
EBV1 = false	false	false	false
error in EBV1	error	error	error

Constructor Summary

Constructors

Constructor and Description
AndExpr(INodeReadTrx rtx, AbsAxis mOperand1, AbsAxis mOperand2) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
AtomicValue	evaluate() Performs the expression dependent evaluation of the expression.
void	reset(long mNodeKey) Resetting the nodekey of this axis to a given nodekey.

Methods inherited from class org.treetank.service.xml.xpath.expr.AbsExpression

hasNext

Methods inherited from class org.treetank.axis.AbsAxis

addAtomicToItemList, close, getItemList, getNode, getStartKey, isSelfIncluded, iterator, moveTo, next, remove, resetToLastKey, resetToStartKey

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AndExpr

public AndExpr(INodeReadTrx rtx,
       AbsAxis mOperand1,
       AbsAxis mOperand2)

Constructor. Initializes the internal state.

Parameters:

rtx - Exclusive (immutable) transaction to iterate with.

mOperand1 - First operand

mOperand2 - Second operand

Method Detail

reset

public void reset(long mNodeKey)

Resetting the nodekey of this axis to a given nodekey.

Overrides:

reset in class AbsExpression

Parameters:

mNodeKey - the nodekey where the reset should occur to.

evaluate

public AtomicValue evaluate()
                     throws TTXPathException

Performs the expression dependent evaluation of the expression. (Template method)

Specified by:

evaluate in class AbsExpression

Throws:

TTXPathException