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, QueryObjectModelConstants

Direct Known Subclasses:

LikeConstraint

public class ComparisonConstraint
extends SelectorBasedConstraint
implements QueryObjectModelConstants

ComparisonConstraint implements a comparison constraint.

Field Summary

Fields inherited from interface org.apache.jackrabbit.spi.commons.query.jsr283.qom.QueryObjectModelConstants

JOIN_TYPE_INNER, JOIN_TYPE_LEFT_OUTER, JOIN_TYPE_RIGHT_OUTER, OPERATOR_EQUAL_TO, OPERATOR_GREATER_THAN, OPERATOR_GREATER_THAN_OR_EQUAL_TO, OPERATOR_LESS_THAN, OPERATOR_LESS_THAN_OR_EQUAL_TO, OPERATOR_LIKE, OPERATOR_NOT_EQUAL_TO, ORDER_ASCENDING, ORDER_DESCENDING

Constructor Summary

ComparisonConstraint(DynamicOperand operand1, int operator, Value operand2, SelectorImpl selector)
Creates a new comparision constraint.

Method Summary

boolean	evaluate(ScoreNode[] row, 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,
                            int operator,
                            Value operand2,
                            SelectorImpl selector)

Creates a new comparision 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,
                        Name[] selectorNames,
                        EvaluationContext context)
                 throws IOException

Evaluates this constraint for the given row.

Specified by:

evaluate in interface Constraint

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.