org.apache.jackrabbit.core.query.lucene.constraint
Class ComparisonConstraint

java.lang.Object
  org.apache.jackrabbit.core.query.lucene.constraint.SelectorBasedConstraint
      org.apache.jackrabbit.core.query.lucene.constraint.ComparisonConstraint

All Implemented Interfaces:

Constraint

Direct Known Subclasses:

LikeConstraint

public class ComparisonConstraint
extends SelectorBasedConstraint

ComparisonConstraint implements a comparison constraint.

Constructor Summary

ComparisonConstraint(DynamicOperand operand1, org.apache.jackrabbit.commons.query.qom.Operator operator, Value operand2, org.apache.jackrabbit.spi.commons.query.qom.SelectorImpl selector)
Creates a new comparison constraint.

Method Summary

boolean	evaluate(ScoreNode[] row, org.apache.jackrabbit.spi.Name[] selectorNames, EvaluationContext context) Evaluates this constraint for the given row.
protected boolean	evaluate(Value op1) Evaluates this constraint for the given dynamic operand value op1.

Methods inherited from class org.apache.jackrabbit.core.query.lucene.constraint.SelectorBasedConstraint

getSelector, getSelectorIndex

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparisonConstraint

public ComparisonConstraint(DynamicOperand operand1,
                            org.apache.jackrabbit.commons.query.qom.Operator operator,
                            Value operand2,
                            org.apache.jackrabbit.spi.commons.query.qom.SelectorImpl selector)

Creates a new comparison constraint.

Parameters:

operand1 - the dynamic operand.

operator - the operator.

operand2 - the static operand.

selector - the selector for this constraint.

Method Detail

evaluate

public boolean evaluate(ScoreNode[] row,
                        org.apache.jackrabbit.spi.Name[] selectorNames,
                        EvaluationContext context)
                 throws IOException

Evaluates this constraint for the given row.

Parameters:

row - the current row of score nodes.

selectorNames - the selector names associated with row.

context - the evaluation context.

Returns:

true if the row satisfies the constraint, false otherwise.

Throws:

IOException - if an error occurs while evaluating the constraint.

evaluate

protected boolean evaluate(Value op1)
                    throws RepositoryException

Evaluates this constraint for the given dynamic operand value op1.

Parameters:

op1 - the current value of the dynamic operand.

Returns:

true if the given value satisfies the constraint.

Throws:

RepositoryException - if an error occurs while converting the values.