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1 | package be.nikiroo.fanfix; |
2 | ||
2a25f781 | 3 | import java.awt.image.BufferedImage; |
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4 | import java.io.File; |
5 | import java.io.IOException; | |
6 | import java.io.InputStream; | |
7 | import java.net.URL; | |
8 | import java.util.Map; | |
9 | ||
10 | import javax.imageio.ImageIO; | |
11 | ||
12 | import be.nikiroo.fanfix.bundles.Config; | |
13 | import be.nikiroo.fanfix.supported.BasicSupport; | |
14 | import be.nikiroo.utils.Cache; | |
15 | import be.nikiroo.utils.Downloader; | |
16 | import be.nikiroo.utils.ImageUtils; | |
17 | ||
18 | /** | |
19 | * This cache will manage Internet (and local) downloads, as well as put the | |
20 | * downloaded files into a cache. | |
21 | * <p> | |
22 | * As long the cached resource is not too old, it will use it instead of | |
23 | * retrieving the file again. | |
24 | * | |
25 | * @author niki | |
26 | */ | |
27 | public class DataLoader { | |
28 | private Cache cache; | |
29 | private Downloader downloader; | |
30 | ||
31 | /** | |
32 | * Create a new {@link DataLoader} object. | |
33 | * | |
34 | * @param dir | |
35 | * the directory to use as cache | |
36 | * @param UA | |
37 | * the User-Agent to use to download the resources | |
38 | * @param hoursChanging | |
39 | * the number of hours after which a cached file that is thought | |
40 | * to change ~often is considered too old (or -1 for | |
41 | * "never too old") | |
42 | * @param hoursStable | |
43 | * the number of hours after which a LARGE cached file that is | |
44 | * thought to change rarely is considered too old (or -1 for | |
45 | * "never too old") | |
46 | * | |
47 | * @throws IOException | |
48 | * in case of I/O error | |
49 | */ | |
50 | public DataLoader(File dir, String UA, int hoursChanging, int hoursStable) | |
51 | throws IOException { | |
52 | cache = new Cache(dir, hoursChanging, hoursStable); | |
53 | downloader = new Downloader(UA); | |
54 | } | |
55 | ||
56 | /** | |
57 | * Open a resource (will load it from the cache if possible, or save it into | |
58 | * the cache after downloading if not). | |
59 | * | |
60 | * @param url | |
61 | * the resource to open | |
62 | * @param support | |
63 | * the support to use to download the resource | |
64 | * @param stable | |
65 | * TRUE for more stable resources, FALSE when they often change | |
66 | * | |
67 | * @return the opened resource, NOT NULL | |
68 | * | |
69 | * @throws IOException | |
70 | * in case of I/O error | |
71 | */ | |
72 | public InputStream open(URL url, BasicSupport support, boolean stable) | |
73 | throws IOException { | |
74 | // MUST NOT return null | |
75 | return open(url, support, stable, url); | |
76 | } | |
77 | ||
78 | /** | |
79 | * Open a resource (will load it from the cache if possible, or save it into | |
80 | * the cache after downloading if not). | |
81 | * <p> | |
82 | * The cached resource will be assimilated to the given original {@link URL} | |
83 | * | |
84 | * @param url | |
85 | * the resource to open | |
86 | * @param support | |
87 | * the support to use to download the resource | |
88 | * @param stable | |
89 | * TRUE for more stable resources, FALSE when they often change | |
90 | * @param originalUrl | |
91 | * the original {@link URL} used to locate the cached resource | |
92 | * | |
93 | * @return the opened resource, NOT NULL | |
94 | * | |
95 | * @throws IOException | |
96 | * in case of I/O error | |
97 | */ | |
98 | public InputStream open(URL url, BasicSupport support, boolean stable, | |
99 | URL originalUrl) throws IOException { | |
100 | // MUST NOT return null | |
101 | try { | |
102 | InputStream in = cache.load(originalUrl, false, stable); | |
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103 | Instance.getTraceHandler().trace( |
104 | "Cache " + (in != null ? "hit" : "miss") + ": " + url); | |
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105 | |
106 | if (in == null) { | |
107 | try { | |
108 | in = openNoCache(url, support, null, null, null); | |
109 | cache.save(in, originalUrl); | |
110 | // ..But we want a resetable stream | |
111 | in.close(); | |
112 | in = cache.load(originalUrl, false, stable); | |
113 | } catch (IOException e) { | |
114 | throw new IOException("Cannot save the url: " | |
115 | + (url == null ? "null" : url.toString()), e); | |
116 | } | |
117 | } | |
118 | ||
119 | return in; | |
120 | } catch (IOException e) { | |
121 | throw new IOException("Cannot open the url: " | |
122 | + (url == null ? "null" : url.toString()), e); | |
123 | } | |
124 | } | |
125 | ||
126 | /** | |
127 | * Open the given {@link URL} without using the cache, but still update the | |
128 | * cookies. | |
129 | * | |
130 | * @param url | |
131 | * the {@link URL} to open | |
132 | * | |
133 | * @return the {@link InputStream} of the opened page | |
134 | * | |
135 | * @throws IOException | |
136 | * in case of I/O error | |
137 | */ | |
138 | public InputStream openNoCache(URL url) throws IOException { | |
139 | return downloader.open(url); | |
140 | } | |
141 | ||
142 | /** | |
143 | * Open the given {@link URL} without using the cache, but still using and | |
144 | * updating the cookies. | |
145 | * | |
146 | * @param url | |
147 | * the {@link URL} to open | |
148 | * @param support | |
149 | * the {@link BasicSupport} used for the cookies | |
150 | * @param postParams | |
151 | * the POST parameters | |
152 | * @param getParams | |
153 | * the GET parameters (priority over POST) | |
154 | * @param oauth | |
155 | * OAuth authorization (aka, "bearer XXXXXXX") | |
156 | * | |
157 | * @return the {@link InputStream} of the opened page | |
158 | * | |
159 | * @throws IOException | |
160 | * in case of I/O error | |
161 | */ | |
162 | public InputStream openNoCache(URL url, BasicSupport support, | |
163 | Map<String, String> postParams, Map<String, String> getParams, | |
164 | String oauth) throws IOException { | |
165 | ||
166 | Map<String, String> cookiesValues = null; | |
167 | URL currentReferer = url; | |
168 | if (support != null) { | |
169 | cookiesValues = support.getCookies(); | |
170 | currentReferer = support.getCurrentReferer(); | |
171 | // priority: arguments | |
172 | if (oauth == null) { | |
173 | oauth = support.getOAuth(); | |
174 | } | |
175 | } | |
176 | ||
177 | return downloader.open(url, currentReferer, cookiesValues, postParams, | |
178 | getParams, oauth); | |
179 | } | |
180 | ||
181 | /** | |
182 | * Refresh the resource into cache if needed. | |
183 | * | |
184 | * @param url | |
185 | * the resource to open | |
186 | * @param support | |
187 | * the support to use to download the resource | |
188 | * @param stable | |
189 | * TRUE for more stable resources, FALSE when they often change | |
190 | * | |
191 | * @throws IOException | |
192 | * in case of I/O error | |
193 | */ | |
194 | public void refresh(URL url, BasicSupport support, boolean stable) | |
195 | throws IOException { | |
196 | if (!cache.check(url, false, stable)) { | |
197 | open(url, support, stable).close(); | |
198 | } | |
199 | } | |
200 | ||
201 | /** | |
202 | * Check the resource to see if it is in the cache. | |
203 | * | |
204 | * @param url | |
205 | * the resource to check | |
206 | * @param stable | |
207 | * a stable file (that dones't change too often) -- parameter | |
208 | * used to check if the file is too old to keep or not | |
209 | * | |
210 | * @return TRUE if it is | |
211 | * | |
212 | */ | |
213 | public boolean check(URL url, boolean stable) { | |
214 | return cache.check(url, false, stable); | |
215 | } | |
216 | ||
217 | /** | |
218 | * Save the given resource as an image on disk using the default image | |
219 | * format for content. | |
220 | * | |
221 | * @param url | |
222 | * the resource | |
223 | * @param target | |
224 | * the target file | |
225 | * | |
226 | * @throws IOException | |
227 | * in case of I/O error | |
228 | */ | |
229 | public void saveAsImage(URL url, File target) throws IOException { | |
230 | InputStream in = open(url, null, true); | |
231 | try { | |
2a25f781 | 232 | saveAsImage(ImageUtils.fromStream(in), target); |
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233 | } finally { |
234 | in.close(); | |
235 | } | |
236 | } | |
237 | ||
2a25f781 NR |
238 | /** |
239 | * Save the given resource as an image on disk using the default image | |
240 | * format for content. | |
241 | * | |
242 | * @param image | |
243 | * the resource | |
244 | * @param target | |
245 | * the target file | |
246 | * | |
247 | * @throws IOException | |
248 | * in case of I/O error | |
249 | */ | |
250 | public void saveAsImage(BufferedImage image, File target) | |
251 | throws IOException { | |
252 | try { | |
253 | String format = Instance.getConfig() | |
254 | .getString(Config.IMAGE_FORMAT_CONTENT).toLowerCase(); | |
2a25f781 | 255 | |
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256 | boolean ok = false; |
257 | try { | |
258 | ok = ImageIO.write(image, format, target); | |
259 | } catch (IOException e) { | |
260 | ok = false; | |
261 | } | |
262 | ||
263 | // Some formats are not reliable | |
264 | // Second change: PNG | |
265 | if (!ok && !format.equals("png")) { | |
266 | ok = ImageIO.write(image, "png", target); | |
267 | } | |
268 | ||
269 | if (!ok) { | |
270 | throw new IOException( | |
271 | "Cannot find a writer for this image and format: " | |
272 | + format); | |
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273 | } |
274 | } catch (IOException e) { | |
275 | throw new IOException("Cannot write image to " + target, e); | |
276 | } | |
277 | } | |
278 | ||
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279 | /** |
280 | * Manually add this item to the cache. | |
281 | * | |
282 | * @param in | |
283 | * the input data | |
284 | * @param uniqueID | |
285 | * a unique ID for this resource | |
286 | * | |
287 | * @return the resulting {@link File} | |
288 | * | |
289 | * @throws IOException | |
290 | * in case of I/O error | |
291 | */ | |
292 | public File addToCache(InputStream in, String uniqueID) throws IOException { | |
293 | return cache.save(in, uniqueID); | |
294 | } | |
295 | ||
296 | /** | |
297 | * Return the {@link InputStream} corresponding to the given unique ID, or | |
298 | * NULL if none found. | |
299 | * | |
300 | * @param uniqueID | |
301 | * the unique ID | |
302 | * | |
303 | * @return the content or NULL | |
304 | */ | |
305 | public InputStream getFromCache(String uniqueID) { | |
306 | return cache.load(uniqueID, true, true); | |
307 | } | |
308 | ||
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309 | /** |
310 | * Remove the given resource from the cache. | |
311 | * | |
312 | * @param uniqueID | |
313 | * a unique ID used to locate the cached resource | |
314 | * | |
315 | * @return TRUE if it was removed | |
316 | */ | |
317 | public boolean removeFromCache(String uniqueID) { | |
318 | return cache.remove(uniqueID); | |
319 | } | |
320 | ||
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321 | /** |
322 | * Clean the cache (delete the cached items). | |
323 | * | |
324 | * @param onlyOld | |
325 | * only clean the files that are considered too old | |
326 | * | |
327 | * @return the number of cleaned items | |
328 | */ | |
329 | public int cleanCache(boolean onlyOld) { | |
330 | return cache.clean(onlyOld); | |
331 | } | |
332 | } |