| 1 | package be.nikiroo.utils; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.EventListener; |
| 5 | import java.util.HashMap; |
| 6 | import java.util.List; |
| 7 | import java.util.Map; |
| 8 | import java.util.Map.Entry; |
| 9 | import java.util.Set; |
| 10 | |
| 11 | /** |
| 12 | * Progress reporting system, possibly nested. |
| 13 | * |
| 14 | * @author niki |
| 15 | */ |
| 16 | public class Progress { |
| 17 | public interface ProgressListener extends EventListener { |
| 18 | /** |
| 19 | * A progression event. |
| 20 | * |
| 21 | * @param progress |
| 22 | * the {@link Progress} object that generated it, not |
| 23 | * necessarily the same as the one where the listener was |
| 24 | * attached (it could be a child {@link Progress} of this |
| 25 | * {@link Progress}). |
| 26 | * @param name |
| 27 | * the first non-null name of the {@link Progress} step that |
| 28 | * generated this event |
| 29 | */ |
| 30 | public void progress(Progress progress, String name); |
| 31 | } |
| 32 | |
| 33 | private String name; |
| 34 | private Map<Progress, Double> children; |
| 35 | private List<ProgressListener> listeners; |
| 36 | private int min; |
| 37 | private int max; |
| 38 | private int localProgress; |
| 39 | private int progress; // children included |
| 40 | |
| 41 | /** |
| 42 | * Create a new default unnamed {@link Progress}, from 0 to 100. |
| 43 | */ |
| 44 | public Progress() { |
| 45 | this(null); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Create a new default {@link Progress}, from 0 to 100. |
| 50 | * |
| 51 | * @param name |
| 52 | * the name of this {@link Progress} step |
| 53 | */ |
| 54 | public Progress(String name) { |
| 55 | this(name, 0, 100); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Create a new unnamed {@link Progress}, from min to max. |
| 60 | * |
| 61 | * @param min |
| 62 | * the minimum progress value (and starting value) -- must be |
| 63 | * non-negative |
| 64 | * @param max |
| 65 | * the maximum progress value |
| 66 | */ |
| 67 | public Progress(int min, int max) { |
| 68 | this(null, min, max); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Create a new {@link Progress}, from min to max. |
| 73 | * |
| 74 | * @param name |
| 75 | * the name of this {@link Progress} step |
| 76 | * @param min |
| 77 | * the minimum progress value (and starting value) -- must be |
| 78 | * non-negative |
| 79 | * @param max |
| 80 | * the maximum progress value |
| 81 | */ |
| 82 | public Progress(String name, int min, int max) { |
| 83 | this.name = name; |
| 84 | this.children = new HashMap<Progress, Double>(); |
| 85 | this.listeners = new ArrayList<Progress.ProgressListener>(); |
| 86 | setMinMax(min, max); |
| 87 | setProgress(min); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * The name of this {@link Progress} step. |
| 92 | * |
| 93 | * @return the name |
| 94 | */ |
| 95 | public String getName() { |
| 96 | return name; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * The name of this {@link Progress} step. |
| 101 | * |
| 102 | * @param name |
| 103 | * the new name |
| 104 | */ |
| 105 | public void setName(String name) { |
| 106 | this.name = name; |
| 107 | // will fire an action event: |
| 108 | setProgress(this.localProgress); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * The minimum progress value. |
| 113 | * |
| 114 | * @return the min |
| 115 | */ |
| 116 | public int getMin() { |
| 117 | return min; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * The minimum progress value. |
| 122 | * |
| 123 | * @param min |
| 124 | * the min to set |
| 125 | */ |
| 126 | public void setMin(int min) { |
| 127 | if (min < 0) { |
| 128 | throw new Error("negative values not supported"); |
| 129 | } |
| 130 | |
| 131 | if (min > max) { |
| 132 | throw new Error( |
| 133 | "The minimum progress value must be <= the maximum progress value"); |
| 134 | } |
| 135 | |
| 136 | this.min = min; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * The maximum progress value. |
| 141 | * |
| 142 | * @return the max |
| 143 | */ |
| 144 | public int getMax() { |
| 145 | return max; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * The maximum progress value (must be >= the minimum progress value). |
| 150 | * |
| 151 | * @param max |
| 152 | * the max to set |
| 153 | */ |
| 154 | public void setMax(int max) { |
| 155 | if (max < min) { |
| 156 | throw new Error( |
| 157 | "The maximum progress value must be >= the minimum progress value"); |
| 158 | } |
| 159 | |
| 160 | this.max = max; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Set both the minimum and maximum progress values. |
| 165 | * |
| 166 | * @param min |
| 167 | * the min |
| 168 | * @param max |
| 169 | * the max |
| 170 | */ |
| 171 | public void setMinMax(int min, int max) { |
| 172 | if (min < 0) { |
| 173 | throw new Error("negative values not supported"); |
| 174 | } |
| 175 | |
| 176 | if (min > max) { |
| 177 | throw new Error( |
| 178 | "The minimum progress value must be <= the maximum progress value"); |
| 179 | } |
| 180 | |
| 181 | this.min = min; |
| 182 | this.max = max; |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Get the total progress value (including the optional children |
| 187 | * {@link Progress}) on a {@link Progress#getMin()} to |
| 188 | * {@link Progress#getMax()} scale. |
| 189 | * |
| 190 | * @return the progress the value |
| 191 | */ |
| 192 | public int getProgress() { |
| 193 | return progress; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Set the local progress value (not including the optional children |
| 198 | * {@link Progress}), on a {@link Progress#getMin()} to |
| 199 | * {@link Progress#getMax()} scale. |
| 200 | * |
| 201 | * @param progress |
| 202 | * the progress to set |
| 203 | */ |
| 204 | public void setProgress(int progress) { |
| 205 | int diff = this.progress - this.localProgress; |
| 206 | this.localProgress = progress; |
| 207 | setTotalProgress(this, name, progress + diff); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * Check if the action corresponding to this {@link Progress} is done (i.e., |
| 212 | * if its progress value is >= its max value). |
| 213 | * |
| 214 | * @return TRUE if it is |
| 215 | */ |
| 216 | public boolean isDone() { |
| 217 | return progress >= max; |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Get the total progress value (including the optional children |
| 222 | * {@link Progress}) on a 0.0 to 1.0 scale. |
| 223 | * |
| 224 | * @return the progress |
| 225 | */ |
| 226 | public double getRelativeProgress() { |
| 227 | return (((double) progress) / (max - min)); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Return the list of direct children of this {@link Progress}. |
| 232 | * |
| 233 | * @return the children (who will think of them??) |
| 234 | */ |
| 235 | public Set<Progress> getChildren() { |
| 236 | return children.keySet(); |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Set the total progress value (including the optional children |
| 241 | * {@link Progress}), on a {@link Progress#getMin()} to |
| 242 | * {@link Progress#getMax()} scale. |
| 243 | * |
| 244 | * @param pg |
| 245 | * the {@link Progress} to report as the progression emitter |
| 246 | * @param name |
| 247 | * the current name (if it is NULL, the first non-null name in |
| 248 | * the hierarchy will overwrite it) of the {@link Progress} who |
| 249 | * emitted this change |
| 250 | * @param progress |
| 251 | * the progress to set |
| 252 | */ |
| 253 | private void setTotalProgress(Progress pg, String name, int progress) { |
| 254 | this.progress = progress; |
| 255 | |
| 256 | for (ProgressListener l : listeners) { |
| 257 | l.progress(pg, name); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Add a {@link ProgressListener} that will trigger on progress changes. |
| 263 | * <p> |
| 264 | * Note: the {@link Progress} that will be reported will be the active |
| 265 | * progress, not necessarily the same as the current one (it could be a |
| 266 | * child {@link Progress} of this {@link Progress}). |
| 267 | * |
| 268 | * @param l |
| 269 | * the listener |
| 270 | */ |
| 271 | public void addProgressListener(ProgressListener l) { |
| 272 | this.listeners.add(l); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Remove a {@link ProgressListener} that would trigger on progress changes. |
| 277 | * |
| 278 | * @param l |
| 279 | * the listener |
| 280 | * |
| 281 | * @return TRUE if it was found (and removed) |
| 282 | */ |
| 283 | public boolean removeProgressListener(ProgressListener l) { |
| 284 | return this.listeners.remove(l); |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Add a child {@link Progress} of the given weight. |
| 289 | * |
| 290 | * @param progress |
| 291 | * the child {@link Progress} to add |
| 292 | * @param weight |
| 293 | * the weight (on a {@link Progress#getMin()} to |
| 294 | * {@link Progress#getMax()} scale) of this child |
| 295 | * {@link Progress} in relation to its parent |
| 296 | */ |
| 297 | public void addProgress(Progress progress, double weight) { |
| 298 | if (weight < min || weight > max) { |
| 299 | throw new Error( |
| 300 | "A Progress object cannot have a weight outside its parent range"); |
| 301 | } |
| 302 | |
| 303 | // Note: this is quite inefficient, especially with many children |
| 304 | // TODO: improve it? |
| 305 | progress.addProgressListener(new ProgressListener() { |
| 306 | public void progress(Progress pg, String name) { |
| 307 | double total = ((double) localProgress) / (max - min); |
| 308 | for (Entry<Progress, Double> entry : children.entrySet()) { |
| 309 | total += (entry.getValue() / (max - min)) |
| 310 | * entry.getKey().getRelativeProgress(); |
| 311 | } |
| 312 | |
| 313 | if (name == null) { |
| 314 | name = Progress.this.name; |
| 315 | } |
| 316 | |
| 317 | setTotalProgress(pg, name, |
| 318 | (int) Math.round(total * (max - min))); |
| 319 | } |
| 320 | }); |
| 321 | |
| 322 | this.children.put(progress, weight); |
| 323 | } |
| 324 | } |