Constraint (Apache Jackrabbit 2.23.1-beta API)

All Known Implementing Classes:

AndConstraint, ChildNodeConstraint, ComparisonConstraint, DescendantNodeConstraint, FullTextConstraint, HierarchyConstraint, LikeConstraint, NotConstraint, OrConstraint, PropertyExistenceConstraint, QueryConstraint, SameNodeConstraint, SelectorBasedConstraint
```
public interface Constraint
```
Constraint defines an interface for a QOM constraint.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`evaluate(ScoreNode[] row, Name[] selectorNames, EvaluationContext context)`	Evaluates this constraint for the given row.

- Method Detail
  - evaluate
```
boolean evaluate(ScoreNode[] row,
                 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.