aboutsummaryrefslogtreecommitdiffstats
path: root/client-compiler/src/com/vaadin/terminal/gwt/widgetsetutils/ClassPathExplorer.java
blob: f57a58a557d8ab38dad188de8313ee26ac8d4bdf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/*
 * Copyright 2011 Vaadin Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.vaadin.terminal.gwt.widgetsetutils;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Utility class to collect widgetset related information from classpath.
 * Utility will seek all directories from classpaths, and jar files having
 * "Vaadin-Widgetsets" key in their manifest file.
 * <p>
 * Used by WidgetMapGenerator and ide tools to implement some monkey coding for
 * you.
 * <p>
 * Developer notice: If you end up reading this comment, I guess you have faced
 * a sluggish performance of widget compilation or unreliable detection of
 * components in your classpaths. The thing you might be able to do is to use
 * annotation processing tool like apt to generate the needed information. Then
 * either use that information in {@link WidgetMapGenerator} or create the
 * appropriate monkey code for gwt directly in annotation processor and get rid
 * of {@link WidgetMapGenerator}. Using annotation processor might be a good
 * idea when dropping Java 1.5 support (integrated to javac in 6).
 * 
 */
public class ClassPathExplorer {

    private static final String VAADIN_ADDON_VERSION_ATTRIBUTE = "Vaadin-Package-Version";

    /**
     * File filter that only accepts directories.
     */
    private final static FileFilter DIRECTORIES_ONLY = new FileFilter() {
        @Override
        public boolean accept(File f) {
            if (f.exists() && f.isDirectory()) {
                return true;
            } else {
                return false;
            }
        }
    };

    /**
     * Raw class path entries as given in the java class path string. Only
     * entries that could include widgets/widgetsets are listed (primarily
     * directories, Vaadin JARs and add-on JARs).
     */
    private static List<String> rawClasspathEntries = getRawClasspathEntries();

    /**
     * Map from identifiers (either a package name preceded by the path and a
     * slash, or a URL for a JAR file) to the corresponding URLs. This is
     * constructed from the class path.
     */
    private static Map<String, URL> classpathLocations = getClasspathLocations(rawClasspathEntries);

    /**
     * No instantiation from outside, callable methods are static.
     */
    private ClassPathExplorer() {
    }

    /**
     * Finds the names and locations of widgetsets available on the class path.
     * 
     * @return map from widgetset classname to widgetset location URL
     */
    public static Map<String, URL> getAvailableWidgetSets() {
        long start = System.currentTimeMillis();
        Map<String, URL> widgetsets = new HashMap<String, URL>();
        Set<String> keySet = classpathLocations.keySet();
        for (String location : keySet) {
            searchForWidgetSets(location, widgetsets);
        }
        long end = System.currentTimeMillis();

        StringBuilder sb = new StringBuilder();
        sb.append("Widgetsets found from classpath:\n");
        for (String ws : widgetsets.keySet()) {
            sb.append("\t");
            sb.append(ws);
            sb.append(" in ");
            sb.append(widgetsets.get(ws));
            sb.append("\n");
        }
        final Logger logger = getLogger();
        logger.info(sb.toString());
        logger.info("Search took " + (end - start) + "ms");
        return widgetsets;
    }

    /**
     * Finds all GWT modules / Vaadin widgetsets in a valid location.
     * 
     * If the location is a directory, all GWT modules (files with the
     * ".gwt.xml" extension) are added to widgetsets.
     * 
     * If the location is a JAR file, the comma-separated values of the
     * "Vaadin-Widgetsets" attribute in its manifest are added to widgetsets.
     * 
     * @param locationString
     *            an entry in {@link #classpathLocations}
     * @param widgetsets
     *            a map from widgetset name (including package, with dots as
     *            separators) to a URL (see {@link #classpathLocations}) - new
     *            entries are added to this map
     */
    private static void searchForWidgetSets(String locationString,
            Map<String, URL> widgetsets) {

        URL location = classpathLocations.get(locationString);
        File directory = new File(location.getFile());

        if (directory.exists() && !directory.isHidden()) {
            // Get the list of the files contained in the directory
            String[] files = directory.list();
            for (int i = 0; i < files.length; i++) {
                // we are only interested in .gwt.xml files
                if (!files[i].endsWith(".gwt.xml")) {
                    continue;
                }

                // remove the .gwt.xml extension
                String classname = files[i].substring(0, files[i].length() - 8);
                String packageName = locationString.substring(locationString
                        .lastIndexOf("/") + 1);
                classname = packageName + "." + classname;

                if (!WidgetSetBuilder.isWidgetset(classname)) {
                    // Only return widgetsets and not GWT modules to avoid
                    // comparing modules and widgetsets
                    continue;
                }

                if (!widgetsets.containsKey(classname)) {
                    String packagePath = packageName.replaceAll("\\.", "/");
                    String basePath = location.getFile().replaceAll(
                            "/" + packagePath + "$", "");
                    try {
                        URL url = new URL(location.getProtocol(),
                                location.getHost(), location.getPort(),
                                basePath);
                        widgetsets.put(classname, url);
                    } catch (MalformedURLException e) {
                        // should never happen as based on an existing URL,
                        // only changing end of file name/path part
                        getLogger().log(Level.SEVERE,
                                "Error locating the widgetset " + classname, e);
                    }
                }
            }
        } else {

            try {
                // check files in jar file, entries will list all directories
                // and files in jar

                URLConnection openConnection = location.openConnection();
                if (openConnection instanceof JarURLConnection) {
                    JarURLConnection conn = (JarURLConnection) openConnection;

                    JarFile jarFile = conn.getJarFile();

                    Manifest manifest = jarFile.getManifest();
                    if (manifest == null) {
                        // No manifest so this is not a Vaadin Add-on
                        return;
                    }
                    String value = manifest.getMainAttributes().getValue(
                            "Vaadin-Widgetsets");
                    if (value != null) {
                        String[] widgetsetNames = value.split(",");
                        for (int i = 0; i < widgetsetNames.length; i++) {
                            String widgetsetname = widgetsetNames[i].trim()
                                    .intern();
                            if (!widgetsetname.equals("")) {
                                widgetsets.put(widgetsetname, location);
                            }
                        }
                    }
                }
            } catch (IOException e) {
                getLogger().log(Level.WARNING, "Error parsing jar file", e);
            }

        }
    }

    /**
     * Splits the current class path into entries, and filters them accepting
     * directories, Vaadin add-on JARs with widgetsets and Vaadin JARs.
     * 
     * Some other non-JAR entries may also be included in the result.
     * 
     * @return filtered list of class path entries
     */
    private final static List<String> getRawClasspathEntries() {
        // try to keep the order of the classpath
        List<String> locations = new ArrayList<String>();

        String pathSep = System.getProperty("path.separator");
        String classpath = System.getProperty("java.class.path");

        if (classpath.startsWith("\"")) {
            classpath = classpath.substring(1);
        }
        if (classpath.endsWith("\"")) {
            classpath = classpath.substring(0, classpath.length() - 1);
        }

        getLogger().fine("Classpath: " + classpath);

        String[] split = classpath.split(pathSep);
        for (int i = 0; i < split.length; i++) {
            String classpathEntry = split[i];
            if (acceptClassPathEntry(classpathEntry)) {
                locations.add(classpathEntry);
            }
        }

        return locations;
    }

    /**
     * Determine every URL location defined by the current classpath, and it's
     * associated package name.
     * 
     * See {@link #classpathLocations} for information on output format.
     * 
     * @param rawClasspathEntries
     *            raw class path entries as split from the Java class path
     *            string
     * @return map of classpath locations, see {@link #classpathLocations}
     */
    private final static Map<String, URL> getClasspathLocations(
            List<String> rawClasspathEntries) {
        long start = System.currentTimeMillis();
        // try to keep the order of the classpath
        Map<String, URL> locations = new LinkedHashMap<String, URL>();
        for (String classpathEntry : rawClasspathEntries) {
            File file = new File(classpathEntry);
            include(null, file, locations);
        }
        long end = System.currentTimeMillis();
        Logger logger = getLogger();
        if (logger.isLoggable(Level.FINE)) {
            logger.fine("getClassPathLocations took " + (end - start) + "ms");
        }
        return locations;
    }

    /**
     * Checks a class path entry to see whether it can contain widgets and
     * widgetsets.
     * 
     * All directories are automatically accepted. JARs are accepted if they
     * have the "Vaadin-Widgetsets" attribute in their manifest or the JAR file
     * name contains "vaadin-" or ".vaadin.".
     * 
     * Also other non-JAR entries may be accepted, the caller should be prepared
     * to handle them.
     * 
     * @param classpathEntry
     *            class path entry string as given in the Java class path
     * @return true if the entry should be considered when looking for widgets
     *         or widgetsets
     */
    private static boolean acceptClassPathEntry(String classpathEntry) {
        if (!classpathEntry.endsWith(".jar")) {
            // accept all non jars (practically directories)
            return true;
        } else {
            // accepts jars that comply with vaadin-component packaging
            // convention (.vaadin. or vaadin- as distribution packages),
            if (classpathEntry.contains("vaadin-")
                    || classpathEntry.contains(".vaadin.")) {
                return true;
            } else {
                URL url;
                try {
                    url = new URL("file:"
                            + new File(classpathEntry).getCanonicalPath());
                    url = new URL("jar:" + url.toExternalForm() + "!/");
                    JarURLConnection conn = (JarURLConnection) url
                            .openConnection();
                    getLogger().fine(url.toString());
                    JarFile jarFile = conn.getJarFile();
                    Manifest manifest = jarFile.getManifest();
                    if (manifest != null) {
                        Attributes mainAttributes = manifest
                                .getMainAttributes();
                        if (mainAttributes.getValue("Vaadin-Widgetsets") != null) {
                            return true;
                        }
                    }
                } catch (MalformedURLException e) {
                    getLogger().log(Level.FINEST, "Failed to inspect JAR file",
                            e);
                } catch (IOException e) {
                    getLogger().log(Level.FINEST, "Failed to inspect JAR file",
                            e);
                }

                return false;
            }
        }
    }

    /**
     * Recursively add subdirectories and jar files to locations - see
     * {@link #classpathLocations}.
     * 
     * @param name
     * @param file
     * @param locations
     */
    private final static void include(String name, File file,
            Map<String, URL> locations) {
        if (!file.exists()) {
            return;
        }
        if (!file.isDirectory()) {
            // could be a JAR file
            includeJar(file, locations);
            return;
        }

        if (file.isHidden() || file.getPath().contains(File.separator + ".")) {
            return;
        }

        if (name == null) {
            name = "";
        } else {
            name += ".";
        }

        // add all directories recursively
        File[] dirs = file.listFiles(DIRECTORIES_ONLY);
        for (int i = 0; i < dirs.length; i++) {
            try {
                // add the present directory
                if (!dirs[i].isHidden()
                        && !dirs[i].getPath().contains(File.separator + ".")) {
                    String key = dirs[i].getCanonicalPath() + "/" + name
                            + dirs[i].getName();
                    locations.put(key,
                            new URL("file://" + dirs[i].getCanonicalPath()));
                }
            } catch (Exception ioe) {
                return;
            }
            include(name + dirs[i].getName(), dirs[i], locations);
        }
    }

    /**
     * Add a jar file to locations - see {@link #classpathLocations}.
     * 
     * @param name
     * @param locations
     */
    private static void includeJar(File file, Map<String, URL> locations) {
        try {
            URL url = new URL("file:" + file.getCanonicalPath());
            url = new URL("jar:" + url.toExternalForm() + "!/");
            JarURLConnection conn = (JarURLConnection) url.openConnection();
            JarFile jarFile = conn.getJarFile();
            if (jarFile != null) {
                // the key does not matter here as long as it is unique
                locations.put(url.toString(), url);
            }
        } catch (Exception e) {
            // e.printStackTrace();
            return;
        }

    }

    /**
     * Find and return the default source directory where to create new
     * widgetsets.
     * 
     * Return the first directory (not a JAR file etc.) on the classpath by
     * default.
     * 
     * TODO this could be done better...
     * 
     * @return URL
     */
    public static URL getDefaultSourceDirectory() {

        final Logger logger = getLogger();

        if (logger.isLoggable(Level.FINE)) {
            logger.fine("classpathLocations values:");
            ArrayList<String> locations = new ArrayList<String>(
                    classpathLocations.keySet());
            for (String location : locations) {
                logger.fine(String.valueOf(classpathLocations.get(location)));
            }
        }

        Iterator<String> it = rawClasspathEntries.iterator();
        while (it.hasNext()) {
            String entry = it.next();

            File directory = new File(entry);
            if (directory.exists() && !directory.isHidden()
                    && directory.isDirectory()) {
                try {
                    return new URL("file://" + directory.getCanonicalPath());
                } catch (MalformedURLException e) {
                    logger.log(Level.FINEST, "Ignoring exception", e);
                    // ignore: continue to the next classpath entry
                } catch (IOException e) {
                    logger.log(Level.FINEST, "Ignoring exception", e);
                    // ignore: continue to the next classpath entry
                }
            }
        }
        return null;
    }

    /**
     * Test method for helper tool
     */
    public static void main(String[] args) {
        getLogger().info("Searching available widgetsets...");

        Map<String, URL> availableWidgetSets = ClassPathExplorer
                .getAvailableWidgetSets();
        for (String string : availableWidgetSets.keySet()) {

            getLogger().info(string + " in " + availableWidgetSets.get(string));
        }
    }

    private static final Logger getLogger() {
        return Logger.getLogger(ClassPathExplorer.class.getName());
    }

}