/*
* BioJava development code
*
* This code may be freely distributed and modified under the
* terms of the GNU Lesser General Public Licence. This should
* be distributed with the code. If you do not have a copy,
* see:
*
* http://www.gnu.org/copyleft/lesser.html
*
* Copyright for this code is held jointly by the individual
* authors. These should be listed in @author doc comments.
*
* For more information on the BioJava project and its aims,
* or to join the biojava-l mailing list, visit the home page
* at:
*
* http://www.biojava.org/
*
*/
package org.biojava.bio.seq;
/**
* Accept features which are top-level sequence features. This is implemented
* by the logic that the parent
property of top-level features
* will implement the Sequence
interface.
*
* @author Thomas Down
* @since 1.3
*/
final class IsTopLevel implements OptimizableFilter {
public boolean accept(Feature f) {
return f.getParent() instanceof Sequence;
}
public int hashCode() {
return 42;
}
/**
* All instances are equal (this should really be a singleton, but
* that doesn't quite fit current FeatureFilter
* patterns.
*/
public boolean equals(Object o) {
return (o instanceof IsTopLevel);
}
public boolean isProperSubset(FeatureFilter ff) {
return (ff instanceof IsTopLevel) || (ff instanceof AcceptAllFilter);
}
public boolean isDisjoint(FeatureFilter ff) {
return (ff instanceof ByParent) || (ff instanceof ByAncestor);
}
}