| Line | Hits | Source |
|---|---|---|
| 1 | /* | |
| 2 | * Copyright (c) 2003, the JUNG Project and the Regents of the University of | |
| 3 | * California All rights reserved. | |
| 4 | * | |
| 5 | * This software is open-source under the BSD license; see either "license.txt" | |
| 6 | * or http://jung.sourceforge.net/license.txt for a description. | |
| 7 | * | |
| 8 | * Created on Mar 3, 2004 | |
| 9 | */ | |
| 10 | package edu.uci.ics.jung.graph.predicates; | |
| 11 | ||
| 12 | import edu.uci.ics.jung.graph.ArchetypeVertex; | |
| 13 | ||
| 14 | /** | |
| 15 | * A predicate which tests to see whether a specified | |
| 16 | * vertex has any neighbors. Not suitable for use | |
| 17 | * as a constraint. | |
| 18 | * | |
| 19 | * @author Joshua O'Madadhain | |
| 20 | */ | |
| 21 | public class IsolatedVertexPredicate extends VertexPredicate { | |
| 22 | ||
| 23 | private static IsolatedVertexPredicate instance; | |
| 24 | ||
| 25 | private static final String message = "IsolatedVertexPredicate"; | |
| 26 | ||
| 27 | /** | |
| 28 | * Returns an instance of this class. | |
| 29 | */ | |
| 30 | public static IsolatedVertexPredicate getInstance() { | |
| 31 | 3 | if (instance == null) instance = new IsolatedVertexPredicate(); |
| 32 | 3 | return instance; |
| 33 | } | |
| 34 | ||
| 35 | public String toString() { | |
| 36 | 0 | return message; |
| 37 | } | |
| 38 | ||
| 39 | /** | |
| 40 | * Returns <code>true</code> if the argument is a <code>Vertex</code> | |
| 41 | * whose degree is 0. | |
| 42 | * | |
| 43 | * @see org.apache.commons.collections.Predicate#evaluate(java.lang.Object) | |
| 44 | */ | |
| 45 | public boolean evaluateVertex(ArchetypeVertex v) { | |
| 46 | 13 | return (v.degree() == 0); |
| 47 | } | |
| 48 | ||
| 49 | /** | |
| 50 | * This constructor is protected in order to keep equals working by | |
| 51 | * retaining only one instance. (Currently, since there can only be one | |
| 52 | * instance, equals trivially returns true. If this class is extended, be | |
| 53 | * careful to write equals correctly.) | |
| 54 | */ | |
| 55 | protected IsolatedVertexPredicate() { | |
| 56 | 2 | super(); |
| 57 | 2 | } |
| 58 | } |
|
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