1 /*
2 * Copyright 2013 University of Glasgow.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package broadwick.montecarlo;
17
18 import java.io.Serializable;
19 import java.util.LinkedHashMap;
20 import java.util.Map;
21 import lombok.Getter;
22
23 /**
24 * A representation of the current step in a Markov Chain. The step is represented by a set of coordinates in the
25 * parameter space spanning the possible set of steps.
26 */
27 public class MonteCarloStep implements Serializable {
28
29 /**
30 * Copy constructor.
31 * @param step the step to copy.
32 */
33 public MonteCarloStep(final MonteCarloStep step) {
34 this.coordinates = new LinkedHashMap<>();
35 for (Map.Entry<String, Double> entry : step.coordinates.entrySet()) {
36 coordinates.put(entry.getKey(), entry.getValue());
37 }
38 }
39
40 /**
41 * Create a single step in a Markov Chain.
42 * @param coordinates the coordinates of the step in the parameter space of the chain.
43 */
44 public MonteCarloStep(final Map<String, Double> coordinates) {
45 if (coordinates instanceof LinkedHashMap) {
46 this.coordinates = new LinkedHashMap<>();
47 this.coordinates.putAll(coordinates);
48 } else {
49 throw new IllegalArgumentException("The coordinates of the Monte Carlo Path step must be a LinkedHashMap");
50 }
51 }
52
53 @Override
54 public final String toString() {
55 final StringBuilder sb = new StringBuilder();
56 for (Map.Entry<String, Double> entry : coordinates.entrySet()) {
57 sb.append(entry.getValue()).append(',');
58 }
59
60 if (sb.length() > 0) {
61 // remove the last value separator.
62 sb.deleteCharAt(sb.length() - 1);
63 }
64 return sb.toString();
65 }
66 @Getter
67 Map<String, Double> coordinates;
68 }