1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data;
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3 |
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4 | import java.util.EventObject;
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5 | import java.util.Iterator;
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6 | import java.util.LinkedList;
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7 | import java.util.Objects;
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8 |
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9 | import org.openstreetmap.josm.command.Command;
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10 | import org.openstreetmap.josm.data.osm.DataSet;
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11 | import org.openstreetmap.josm.data.osm.OsmDataManager;
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12 | import org.openstreetmap.josm.spi.preferences.Config;
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13 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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14 |
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15 | /**
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16 | * This is the global undo/redo handler for all {@link DataSet}s.
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17 | * <p>
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18 | * If you want to change a data set, you can use {@link #add(Command)} to execute a command on it and make that command undoable.
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19 | */
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20 | public final class UndoRedoHandler {
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21 |
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22 | /**
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23 | * All commands that were made on the dataset. Don't write from outside!
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24 | *
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25 | * @see #getLastCommand()
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26 | */
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27 | public final LinkedList<Command> commands = new LinkedList<>();
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28 | /**
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29 | * The stack for redoing commands
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30 | */
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31 | public final LinkedList<Command> redoCommands = new LinkedList<>();
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32 |
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33 | private final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<>();
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34 | private final LinkedList<CommandQueuePreciseListener> preciseListenerCommands = new LinkedList<>();
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35 |
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36 | private static class InstanceHolder {
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37 | static final UndoRedoHandler INSTANCE = new UndoRedoHandler();
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38 | }
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39 |
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40 | /**
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41 | * Returns the unique instance.
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42 | * @return the unique instance
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43 | * @since 14134
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44 | */
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45 | public static UndoRedoHandler getInstance() {
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46 | return InstanceHolder.INSTANCE;
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47 | }
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48 |
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49 | /**
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50 | * Constructs a new {@code UndoRedoHandler}.
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51 | */
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52 | private UndoRedoHandler() {
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53 | // Hide constructor
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54 | }
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55 |
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56 | /**
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57 | * A simple listener that gets notified of command queue (undo/redo) size changes.
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58 | * @see CommandQueuePreciseListener
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59 | * @since 12718 (moved from {@code OsmDataLayer}
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60 | */
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61 | @FunctionalInterface
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62 | public interface CommandQueueListener {
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63 | /**
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64 | * Notifies the listener about the new queue size
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65 | * @param queueSize Undo stack size
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66 | * @param redoSize Redo stack size
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67 | */
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68 | void commandChanged(int queueSize, int redoSize);
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69 | }
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70 |
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71 | /**
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72 | * A listener that gets notified of command queue (undo/redo) operations individually.
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73 | * @see CommandQueueListener
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74 | * @since 13729
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75 | */
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76 | public interface CommandQueuePreciseListener {
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77 |
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78 | /**
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79 | * Notifies the listener about a new command added to the queue.
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80 | * @param e event
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81 | */
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82 | void commandAdded(CommandAddedEvent e);
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83 |
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84 | /**
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85 | * Notifies the listener about commands being cleaned.
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86 | * @param e event
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87 | */
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88 | void cleaned(CommandQueueCleanedEvent e);
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89 |
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90 | /**
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91 | * Notifies the listener about a command that has been undone.
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92 | * @param e event
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93 | */
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94 | void commandUndone(CommandUndoneEvent e);
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95 |
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96 | /**
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97 | * Notifies the listener about a command that has been redone.
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98 | * @param e event
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99 | */
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100 | void commandRedone(CommandRedoneEvent e);
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101 | }
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102 |
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103 | abstract static class CommandQueueEvent extends EventObject {
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104 | protected CommandQueueEvent(UndoRedoHandler source) {
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105 | super(Objects.requireNonNull(source));
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106 | }
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107 |
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108 | /**
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109 | * Calls the appropriate method of the listener for this event.
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110 | * @param listener dataset listener to notify about this event
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111 | */
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112 | abstract void fire(CommandQueuePreciseListener listener);
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113 |
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114 | @Override
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115 | public final UndoRedoHandler getSource() {
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116 | return (UndoRedoHandler) super.getSource();
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117 | }
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118 | }
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119 |
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120 | /**
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121 | * Event fired after a command has been added to the command queue.
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122 | * @since 13729
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123 | */
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124 | public static final class CommandAddedEvent extends CommandQueueEvent {
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125 |
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126 | private static final long serialVersionUID = 1L;
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127 | private final Command cmd;
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128 |
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129 | private CommandAddedEvent(UndoRedoHandler source, Command cmd) {
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130 | super(source);
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131 | this.cmd = Objects.requireNonNull(cmd);
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132 | }
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133 |
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134 | /**
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135 | * Returns the added command.
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136 | * @return the added command
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137 | */
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138 | public Command getCommand() {
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139 | return cmd;
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140 | }
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141 |
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142 | @Override
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143 | void fire(CommandQueuePreciseListener listener) {
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144 | listener.commandAdded(this);
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145 | }
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146 | }
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147 |
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148 | /**
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149 | * Event fired after the command queue has been cleaned.
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150 | * @since 13729
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151 | */
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152 | public static final class CommandQueueCleanedEvent extends CommandQueueEvent {
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153 |
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154 | private static final long serialVersionUID = 1L;
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155 | private final DataSet ds;
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156 |
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157 | private CommandQueueCleanedEvent(UndoRedoHandler source, DataSet ds) {
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158 | super(source);
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159 | this.ds = ds;
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160 | }
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161 |
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162 | /**
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163 | * Returns the affected dataset.
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164 | * @return the affected dataset, or null if the queue has been globally emptied
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165 | */
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166 | public DataSet getDataSet() {
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167 | return ds;
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168 | }
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169 |
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170 | @Override
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171 | void fire(CommandQueuePreciseListener listener) {
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172 | listener.cleaned(this);
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173 | }
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174 | }
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175 |
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176 | /**
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177 | * Event fired after a command has been undone.
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178 | * @since 13729
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179 | */
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180 | public static final class CommandUndoneEvent extends CommandQueueEvent {
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181 |
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182 | private static final long serialVersionUID = 1L;
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183 | private final Command cmd;
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184 |
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185 | private CommandUndoneEvent(UndoRedoHandler source, Command cmd) {
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186 | super(source);
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187 | this.cmd = Objects.requireNonNull(cmd);
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188 | }
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189 |
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190 | /**
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191 | * Returns the undone command.
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192 | * @return the undone command
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193 | */
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194 | public Command getCommand() {
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195 | return cmd;
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196 | }
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197 |
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198 | @Override
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199 | void fire(CommandQueuePreciseListener listener) {
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200 | listener.commandUndone(this);
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201 | }
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202 | }
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203 |
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204 | /**
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205 | * Event fired after a command has been redone.
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206 | * @since 13729
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207 | */
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208 | public static final class CommandRedoneEvent extends CommandQueueEvent {
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209 |
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210 | private static final long serialVersionUID = 1L;
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211 | private final Command cmd;
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212 |
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213 | private CommandRedoneEvent(UndoRedoHandler source, Command cmd) {
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214 | super(source);
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215 | this.cmd = Objects.requireNonNull(cmd);
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216 | }
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217 |
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218 | /**
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219 | * Returns the redone command.
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220 | * @return the redone command
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221 | */
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222 | public Command getCommand() {
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223 | return cmd;
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224 | }
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225 |
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226 | @Override
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227 | void fire(CommandQueuePreciseListener listener) {
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228 | listener.commandRedone(this);
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229 | }
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230 | }
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231 |
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232 | /**
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233 | * Gets the last command that was executed on the command stack.
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234 | * @return That command or <code>null</code> if there is no such command.
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235 | * @since #12316
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236 | */
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237 | public Command getLastCommand() {
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238 | return commands.peekLast();
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239 | }
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240 |
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241 | /**
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242 | * Executes the command and add it to the intern command queue.
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243 | * @param c The command to execute. Must not be {@code null}.
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244 | */
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245 | public void addNoRedraw(final Command c) {
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246 | CheckParameterUtil.ensureParameterNotNull(c, "c");
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247 | c.executeCommand();
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248 | commands.add(c);
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249 | // Limit the number of commands in the undo list.
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250 | // Currently you have to undo the commands one by one. If
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251 | // this changes, a higher default value may be reasonable.
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252 | if (commands.size() > Config.getPref().getInt("undo.max", 1000)) {
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253 | commands.removeFirst();
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254 | }
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255 | redoCommands.clear();
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256 | }
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257 |
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258 | /**
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259 | * Fires a commands change event after adding a command.
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260 | * @param cmd command added
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261 | * @since 13729
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262 | */
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263 | public void afterAdd(Command cmd) {
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264 | if (cmd != null) {
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265 | fireEvent(new CommandAddedEvent(this, cmd));
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266 | }
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267 | fireCommandsChanged();
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268 | }
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269 |
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270 | /**
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271 | * Executes the command and add it to the intern command queue.
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272 | * @param c The command to execute. Must not be {@code null}.
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273 | */
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274 | public synchronized void add(final Command c) {
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275 | addNoRedraw(c);
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276 | afterAdd(c);
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277 | }
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278 |
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279 | /**
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280 | * Undoes the last added command.
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281 | */
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282 | public void undo() {
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283 | undo(1);
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284 | }
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285 |
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286 | /**
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287 | * Undoes multiple commands.
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288 | * @param num The number of commands to undo
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289 | */
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290 | public synchronized void undo(int num) {
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291 | if (commands.isEmpty())
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292 | return;
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293 | DataSet ds = OsmDataManager.getInstance().getEditDataSet();
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294 | if (ds != null) {
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295 | ds.beginUpdate();
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296 | }
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297 | try {
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298 | for (int i = 1; i <= num; ++i) {
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299 | final Command c = commands.removeLast();
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300 | c.undoCommand();
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301 | redoCommands.addFirst(c);
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302 | fireEvent(new CommandUndoneEvent(this, c));
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303 | if (commands.isEmpty()) {
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304 | break;
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305 | }
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306 | }
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307 | } finally {
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308 | if (ds != null) {
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309 | ds.endUpdate();
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310 | }
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311 | }
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312 | fireCommandsChanged();
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313 | }
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314 |
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315 | /**
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316 | * Redoes the last undoed command.
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317 | */
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318 | public void redo() {
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319 | redo(1);
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320 | }
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321 |
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322 | /**
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323 | * Redoes multiple commands.
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324 | * @param num The number of commands to redo
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325 | */
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326 | public void redo(int num) {
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327 | if (redoCommands.isEmpty())
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328 | return;
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329 | for (int i = 0; i < num; ++i) {
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330 | final Command c = redoCommands.removeFirst();
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331 | c.executeCommand();
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332 | commands.add(c);
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333 | fireEvent(new CommandRedoneEvent(this, c));
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334 | if (redoCommands.isEmpty()) {
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335 | break;
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336 | }
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337 | }
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338 | fireCommandsChanged();
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339 | }
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340 |
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341 | /**
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342 | * Fires a command change to all listeners.
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343 | */
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344 | private void fireCommandsChanged() {
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345 | for (final CommandQueueListener l : listenerCommands) {
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346 | l.commandChanged(commands.size(), redoCommands.size());
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347 | }
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348 | }
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349 |
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350 | private void fireEvent(CommandQueueEvent e) {
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351 | preciseListenerCommands.forEach(e::fire);
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352 | }
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353 |
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354 | /**
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355 | * Resets the undo/redo list.
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356 | */
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357 | public void clean() {
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358 | redoCommands.clear();
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359 | commands.clear();
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360 | fireEvent(new CommandQueueCleanedEvent(this, null));
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361 | fireCommandsChanged();
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362 | }
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363 |
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364 | /**
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365 | * Resets all commands that affect the given dataset.
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366 | * @param dataSet The data set that was affected.
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367 | * @since 12718
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368 | */
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369 | public void clean(DataSet dataSet) {
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370 | if (dataSet == null)
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371 | return;
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372 | boolean changed = false;
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373 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
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374 | if (it.next().getAffectedDataSet() == dataSet) {
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375 | it.remove();
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376 | changed = true;
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377 | }
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378 | }
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379 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
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380 | if (it.next().getAffectedDataSet() == dataSet) {
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381 | it.remove();
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382 | changed = true;
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383 | }
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384 | }
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385 | if (changed) {
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386 | fireEvent(new CommandQueueCleanedEvent(this, dataSet));
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387 | fireCommandsChanged();
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388 | }
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389 | }
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390 |
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391 | /**
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392 | * Removes a command queue listener.
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393 | * @param l The command queue listener to remove
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394 | */
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395 | public void removeCommandQueueListener(CommandQueueListener l) {
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396 | listenerCommands.remove(l);
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397 | }
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398 |
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399 | /**
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400 | * Adds a command queue listener.
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401 | * @param l The command queue listener to add
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402 | * @return {@code true} if the listener has been added, {@code false} otherwise
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403 | */
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404 | public boolean addCommandQueueListener(CommandQueueListener l) {
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405 | return listenerCommands.add(l);
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406 | }
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407 |
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408 | /**
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409 | * Removes a precise command queue listener.
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410 | * @param l The precise command queue listener to remove
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411 | * @since 13729
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412 | */
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413 | public void removeCommandQueuePreciseListener(CommandQueuePreciseListener l) {
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414 | preciseListenerCommands.remove(l);
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415 | }
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416 |
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417 | /**
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418 | * Adds a precise command queue listener.
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419 | * @param l The precise command queue listener to add
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420 | * @return {@code true} if the listener has been added, {@code false} otherwise
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421 | * @since 13729
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422 | */
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423 | public boolean addCommandQueuePreciseListener(CommandQueuePreciseListener l) {
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424 | return preciseListenerCommands.add(l);
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425 | }
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426 | }
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