1 /*
2 * Grapht, an open source dependency injector.
3 * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
4 * Copyright 2010-2014 Regents of the University of Minnesota
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 51
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20 package org.grouplens.grapht.solver;
21
22 import org.grouplens.grapht.ResolutionException;
23 import org.grouplens.grapht.reflect.Desire;
24
25 /**
26 * Thrown by when a cyclic dependency is detected and could not be broken or
27 * bypassed by the solver.
28 *
29 * @author <a href="http://grouplens.org">GroupLens Research</a>
30 */
31 public class CyclicDependencyException extends ResolutionException {
32 private static final long serialVersionUID = 1L;
33
34 private final Desire desire;
35
36 public CyclicDependencyException(Desire desire, String msg) {
37 super(msg);
38 this.desire = desire;
39 }
40
41 /**
42 * @return The current desire that triggered the cycle detection
43 */
44 public Desire getDesire() {
45 return desire;
46 }
47
48 @Override
49 public String getMessage() {
50 return new StringBuilder("Unable to satisfy desire: ")
51 .append(format(desire.getInjectionPoint()))
52 .append('\n')
53 .append("Reason: ")
54 .append(super.getMessage())
55 .toString();
56 }
57 }