2 * DemosceneMusic - Base.java - Copyright © 2012 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.demoscenemusic.data;
20 import java.util.HashMap;
22 import java.util.Map.Entry;
27 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
29 public class DefaultBase implements Base {
31 private final String id;
33 private final Map<String, Value<?>> attributes = new HashMap<String, Value<?>>();
35 protected DefaultBase(String id) {
43 protected boolean hasValue(String name) {
44 return attributes.containsKey(name);
47 @SuppressWarnings({ "synthetic-access", "unchecked" })
48 protected <T> Value<T> value(String name, Class<T> clazz) {
49 if (!attributes.containsKey(name)) {
50 attributes.put(name, new Value<T>());
52 return (Value<T>) attributes.get(name);
55 protected boolean dirty() {
56 for (Value<?> value : attributes.values()) {
72 public int hashCode() {
73 return id().hashCode();
80 public boolean equals(Object obj) {
81 if (!(obj instanceof Base)) {
84 return id().equals(((Base) obj).id());
91 public String toString() {
92 StringBuilder stringBuilder = new StringBuilder();
93 stringBuilder.append(getClass().getName());
94 stringBuilder.append('[').append("id=").append(id());
95 for (Entry<String, Value<?>> attributeEntry : attributes.entrySet()) {
96 stringBuilder.append(',').append(attributeEntry.getKey()).append('=').append(attributeEntry.getValue().get());
98 stringBuilder.append(']');
99 return stringBuilder.toString();
102 protected static class Value<T> {
106 private boolean originalSet;
114 public Value<T> set(T value) {
123 public boolean dirty() {
124 return (original != null) ? !original.equals(current) : current != null;
127 public Value<T> commit() {