1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.io;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import java.security.Security;
31 import java.util.ArrayList;
32 import java.util.List;
33 import java.util.Objects;
34 import java.util.Optional;
35 import java.util.function.Function;
36
37 import jdk.internal.misc.SharedSecrets;
38
39 /**
40 * Filter classes, array lengths, and graph metrics during deserialization.
41 *
42 * <p><strong>Warning: Deserialization of untrusted data is inherently dangerous
43 * and should be avoided. Untrusted data should be carefully validated according to the
44 * "Serialization and Deserialization" section of the
45 * {@extLink secure_coding_guidelines_javase Secure Coding Guidelines for Java SE}.
46 * {@extLink serialization_filter_guide Serialization Filtering} describes best
47 * practices for defensive use of serial filters.
48 * </strong></p>
49 *
50 * If set on an {@link ObjectInputStream}, the {@link #checkInput checkInput(FilterInfo)}
51 * method is called to validate classes, the length of each array,
52 * the number of objects being read from the stream, the depth of the graph,
53 * and the total number of bytes read from the stream.
54 * <p>
55 * A filter can be set via {@link ObjectInputStream#setObjectInputFilter setObjectInputFilter}
56 * for an individual ObjectInputStream.
57 * A filter can be set via {@link Config#setSerialFilter(ObjectInputFilter) Config.setSerialFilter}
58 * to affect every {@code ObjectInputStream} that does not otherwise set a filter.
59 * <p>
60 * A filter determines whether the arguments are {@link Status#ALLOWED ALLOWED}
61 * or {@link Status#REJECTED REJECTED} and should return the appropriate status.
62 * If the filter cannot determine the status it should return
63 * {@link Status#UNDECIDED UNDECIDED}.
64 * Filters should be designed for the specific use case and expected types.
65 * A filter designed for a particular use may be passed a class that is outside
66 * of the scope of the filter. If the purpose of the filter is to black-list classes
67 * then it can reject a candidate class that matches and report UNDECIDED for others.
68 * A filter may be called with class equals {@code null}, {@code arrayLength} equal -1,
69 * the depth, number of references, and stream size and return a status
70 * that reflects only one or only some of the values.
71 * This allows a filter to specific about the choice it is reporting and
72 * to use other filters without forcing either allowed or rejected status.
73 *
74 * <p>
75 * Typically, a custom filter should check if a process-wide filter
76 * is configured and defer to it if so. For example,
77 * <pre>{@code
78 * ObjectInputFilter.Status checkInput(FilterInfo info) {
79 * ObjectInputFilter serialFilter = ObjectInputFilter.Config.getSerialFilter();
80 * if (serialFilter != null) {
81 * ObjectInputFilter.Status status = serialFilter.checkInput(info);
82 * if (status != ObjectInputFilter.Status.UNDECIDED) {
83 * // The process-wide filter overrides this filter
84 * return status;
85 * }
86 * }
87 * if (info.serialClass() != null &&
88 * Remote.class.isAssignableFrom(info.serialClass())) {
89 * return Status.REJECTED; // Do not allow Remote objects
90 * }
91 * return Status.UNDECIDED;
92 * }
93 *}</pre>
94 * <p>
95 * Unless otherwise noted, passing a {@code null} argument to a
96 * method in this interface and its nested classes will cause a
97 * {@link NullPointerException} to be thrown.
98 *
99 * @see ObjectInputStream#setObjectInputFilter(ObjectInputFilter)
100 * @since 9
101 */
102 @FunctionalInterface
103 public interface ObjectInputFilter {
104
105 /**
106 * Check the class, array length, number of object references, depth,
107 * stream size, and other available filtering information.
108 * Implementations of this method check the contents of the object graph being created
109 * during deserialization. The filter returns {@link Status#ALLOWED Status.ALLOWED},
110 * {@link Status#REJECTED Status.REJECTED}, or {@link Status#UNDECIDED Status.UNDECIDED}.
111 *
112 * @param filterInfo provides information about the current object being deserialized,
113 * if any, and the status of the {@link ObjectInputStream}
114 * @return {@link Status#ALLOWED Status.ALLOWED} if accepted,
115 * {@link Status#REJECTED Status.REJECTED} if rejected,
116 * {@link Status#UNDECIDED Status.UNDECIDED} if undecided.
117 */
118 Status checkInput(FilterInfo filterInfo);
119
120 /**
121 * FilterInfo provides access to information about the current object
122 * being deserialized and the status of the {@link ObjectInputStream}.
123 * @since 9
124 */
125 interface FilterInfo {
126 /**
127 * The class of an object being deserialized.
128 * For arrays, it is the array type.
129 * For example, the array class name of a 2 dimensional array of strings is
130 * "{@code [[Ljava.lang.String;}".
131 * To check the array's element type, iteratively use
132 * {@link Class#getComponentType() Class.getComponentType} while the result
133 * is an array and then check the class.
134 * The {@code serialClass is null} in the case where a new object is not being
135 * created and to give the filter a chance to check the depth, number of
136 * references to existing objects, and the stream size.
137 *
138 * @return class of an object being deserialized; may be null
139 */
140 Class<?> serialClass();
141
142 /**
143 * The number of array elements when deserializing an array of the class.
144 *
145 * @return the non-negative number of array elements when deserializing
146 * an array of the class, otherwise -1
147 */
148 long arrayLength();
149
150 /**
151 * The current depth.
152 * The depth starts at {@code 1} and increases for each nested object and
153 * decrements when each nested object returns.
154 *
155 * @return the current depth
156 */
157 long depth();
158
159 /**
160 * The current number of object references.
161 *
162 * @return the non-negative current number of object references
163 */
164 long references();
165
166 /**
167 * The current number of bytes consumed.
168 * @implSpec {@code streamBytes} is implementation specific
169 * and may not be directly related to the object in the stream
170 * that caused the callback.
171 *
172 * @return the non-negative current number of bytes consumed
173 */
174 long streamBytes();
175 }
176
177 /**
178 * The status of a check on the class, array length, number of references,
179 * depth, and stream size.
180 *
181 * @since 9
182 */
183 enum Status {
184 /**
185 * The status is undecided, not allowed and not rejected.
186 */
187 UNDECIDED,
188 /**
189 * The status is allowed.
190 */
191 ALLOWED,
192 /**
193 * The status is rejected.
194 */
195 REJECTED;
196 }
197
198 /**
199 * A utility class to set and get the process-wide filter or create a filter
200 * from a pattern string. If a process-wide filter is set, it will be
201 * used for each {@link ObjectInputStream} that does not set its own filter.
202 * <p>
203 * When setting the filter, it should be stateless and idempotent,
204 * reporting the same result when passed the same arguments.
205 * <p>
206 * The filter is configured during the initialization of the {@code ObjectInputFilter.Config}
207 * class. For example, by calling {@link #getSerialFilter() Config.getSerialFilter}.
208 * If the system property {@code jdk.serialFilter} is defined, it is used
209 * to configure the filter.
210 * If the system property is not defined, and the {@link java.security.Security}
211 * property {@code jdk.serialFilter} is defined then it is used to configure the filter.
212 * Otherwise, the filter is not configured during initialization.
213 * The syntax for each property is the same as for the
214 * {@link #createFilter(String) createFilter} method.
215 * If a filter is not configured, it can be set with
216 * {@link #setSerialFilter(ObjectInputFilter) Config.setSerialFilter}.
217 *
218 * @since 9
219 */
220 final class Config {
221 /* No instances. */
222 private Config() {}
223
224 /**
225 * Lock object for process-wide filter.
226 */
227 private final static Object serialFilterLock = new Object();
228
229 /**
230 * Debug: Logger
231 */
232 private final static System.Logger configLog;
233
234 /**
235 * Logger for debugging.
236 */
237 static void filterLog(System.Logger.Level level, String msg, Object... args) {
238 if (configLog != null) {
239 configLog.log(level, msg, args);
240 }
241 }
242
243 /**
244 * The name for the process-wide deserialization filter.
245 * Used as a system property and a java.security.Security property.
246 */
247 private final static String SERIAL_FILTER_PROPNAME = "jdk.serialFilter";
248
249 /**
250 * The process-wide filter; may be null.
251 * Lookup the filter in java.security.Security or
252 * the system property.
253 */
254 private final static ObjectInputFilter configuredFilter;
255
256 static {
257 configuredFilter = AccessController
258 .doPrivileged((PrivilegedAction<ObjectInputFilter>) () -> {
259 String props = System.getProperty(SERIAL_FILTER_PROPNAME);
260 if (props == null) {
261 props = Security.getProperty(SERIAL_FILTER_PROPNAME);
262 }
263 if (props != null) {
264 System.Logger log =
265 System.getLogger("java.io.serialization");
266 log.log(System.Logger.Level.INFO,
267 "Creating serialization filter from {0}", props);
268 try {
269 return createFilter(props);
270 } catch (RuntimeException re) {
271 log.log(System.Logger.Level.ERROR,
272 "Error configuring filter: {0}", re);
273 }
274 }
275 return null;
276 });
277 configLog = (configuredFilter != null) ? System.getLogger("java.io.serialization") : null;
278
279 // Setup shared secrets for RegistryImpl to use.
280 SharedSecrets.setJavaObjectInputFilterAccess(Config::createFilter2);
281 }
282
283 /**
284 * Current configured filter.
285 */
286 private static volatile ObjectInputFilter serialFilter = configuredFilter;
287
288 /**
289 * Returns the process-wide serialization filter or {@code null} if not configured.
290 *
291 * @return the process-wide serialization filter or {@code null} if not configured
292 */
293 public static ObjectInputFilter getSerialFilter() {
294 return serialFilter;
295 }
296
297 /**
298 * Set the process-wide filter if it has not already been configured or set.
299 *
300 * @param filter the serialization filter to set as the process-wide filter; not null
301 * @throws SecurityException if there is security manager and the
302 * {@code SerializablePermission("serialFilter")} is not granted
303 * @throws IllegalStateException if the filter has already been set {@code non-null}
304 */
305 public static void setSerialFilter(ObjectInputFilter filter) {
306 Objects.requireNonNull(filter, "filter");
307 SecurityManager sm = System.getSecurityManager();
308 if (sm != null) {
309 sm.checkPermission(ObjectStreamConstants.SERIAL_FILTER_PERMISSION);
310 }
311 synchronized (serialFilterLock) {
312 if (serialFilter != null) {
313 throw new IllegalStateException("Serial filter can only be set once");
314 }
315 serialFilter = filter;
316 }
317 }
318
319 /**
320 * Returns an ObjectInputFilter from a string of patterns.
321 * <p>
322 * Patterns are separated by ";" (semicolon). Whitespace is significant and
323 * is considered part of the pattern.
324 * If a pattern includes an equals assignment, "{@code =}" it sets a limit.
325 * If a limit appears more than once the last value is used.
326 * <ul>
327 * <li>maxdepth={@code value} - the maximum depth of a graph</li>
328 * <li>maxrefs={@code value} - the maximum number of internal references</li>
329 * <li>maxbytes={@code value} - the maximum number of bytes in the input stream</li>
330 * <li>maxarray={@code value} - the maximum array length allowed</li>
331 * </ul>
332 * <p>
333 * Other patterns match or reject class or package name
334 * as returned from {@link Class#getName() Class.getName()} and
335 * if an optional module name is present
336 * {@link Module#getName() class.getModule().getName()}.
337 * Note that for arrays the element type is used in the pattern,
338 * not the array type.
339 * <ul>
340 * <li>If the pattern starts with "!", the class is rejected if the remaining pattern is matched;
341 * otherwise the class is allowed if the pattern matches.
342 * <li>If the pattern contains "/", the non-empty prefix up to the "/" is the module name;
343 * if the module name matches the module name of the class then
344 * the remaining pattern is matched with the class name.
345 * If there is no "/", the module name is not compared.
346 * <li>If the pattern ends with ".**" it matches any class in the package and all subpackages.
347 * <li>If the pattern ends with ".*" it matches any class in the package.
348 * <li>If the pattern ends with "*", it matches any class with the pattern as a prefix.
349 * <li>If the pattern is equal to the class name, it matches.
350 * <li>Otherwise, the pattern is not matched.
351 * </ul>
352 * <p>
353 * The resulting filter performs the limit checks and then
354 * tries to match the class, if any. If any of the limits are exceeded,
355 * the filter returns {@link Status#REJECTED Status.REJECTED}.
356 * If the class is an array type, the class to be matched is the element type.
357 * Arrays of any number of dimensions are treated the same as the element type.
358 * For example, a pattern of "{@code !example.Foo}",
359 * rejects creation of any instance or array of {@code example.Foo}.
360 * The first pattern that matches, working from left to right, determines
361 * the {@link Status#ALLOWED Status.ALLOWED}
362 * or {@link Status#REJECTED Status.REJECTED} result.
363 * If the limits are not exceeded and no pattern matches the class,
364 * the result is {@link Status#UNDECIDED Status.UNDECIDED}.
365 *
366 * @param pattern the pattern string to parse; not null
367 * @return a filter to check a class being deserialized;
368 * {@code null} if no patterns
369 * @throws IllegalArgumentException if the pattern string is illegal or
370 * malformed and cannot be parsed.
371 * In particular, if any of the following is true:
372 * <ul>
373 * <li> if a limit is missing the name or the name is not one of
374 * "maxdepth", "maxrefs", "maxbytes", or "maxarray"
375 * <li> if the value of the limit can not be parsed by
376 * {@link Long#parseLong Long.parseLong} or is negative
377 * <li> if the pattern contains "/" and the module name is missing
378 * or the remaining pattern is empty
379 * <li> if the package is missing for ".*" and ".**"
380 * </ul>
381 */
382 public static ObjectInputFilter createFilter(String pattern) {
383 Objects.requireNonNull(pattern, "pattern");
384 return Global.createFilter(pattern, true);
385 }
386
387 /**
388 * Returns an ObjectInputFilter from a string of patterns that
389 * checks only the length for arrays, not the component type.
390 *
391 * @param pattern the pattern string to parse; not null
392 * @return a filter to check a class being deserialized;
393 * {@code null} if no patterns
394 */
395 static ObjectInputFilter createFilter2(String pattern) {
396 Objects.requireNonNull(pattern, "pattern");
397 return Global.createFilter(pattern, false);
398 }
399
400 /**
401 * Implementation of ObjectInputFilter that performs the checks of
402 * the process-wide serialization filter. If configured, it will be
403 * used for all ObjectInputStreams that do not set their own filters.
404 *
405 */
406 final static class Global implements ObjectInputFilter {
407 /**
408 * The pattern used to create the filter.
409 */
410 private final String pattern;
411 /**
412 * The list of class filters.
413 */
414 private final List<Function<Class<?>, Status>> filters;
415 /**
416 * Maximum allowed bytes in the stream.
417 */
418 private long maxStreamBytes;
419 /**
420 * Maximum depth of the graph allowed.
421 */
422 private long maxDepth;
423 /**
424 * Maximum number of references in a graph.
425 */
426 private long maxReferences;
427 /**
428 * Maximum length of any array.
429 */
430 private long maxArrayLength;
431 /**
432 * True to check the component type for arrays.
433 */
434 private final boolean checkComponentType;
435
436 /**
437 * Returns an ObjectInputFilter from a string of patterns.
438 *
439 * @param pattern the pattern string to parse
440 * @param checkComponentType true if the filter should check
441 * the component type of arrays
442 * @return a filter to check a class being deserialized;
443 * {@code null} if no patterns
444 * @throws IllegalArgumentException if the parameter is malformed
445 * if the pattern is missing the name, the long value
446 * is not a number or is negative.
447 */
448 static ObjectInputFilter createFilter(String pattern, boolean checkComponentType) {
449 try {
450 return new Global(pattern, checkComponentType);
451 } catch (UnsupportedOperationException uoe) {
452 // no non-empty patterns
453 return null;
454 }
455 }
456
457 /**
458 * Construct a new filter from the pattern String.
459 *
460 * @param pattern a pattern string of filters
461 * @param checkComponentType true if the filter should check
462 * the component type of arrays
463 * @throws IllegalArgumentException if the pattern is malformed
464 * @throws UnsupportedOperationException if there are no non-empty patterns
465 */
466 private Global(String pattern, boolean checkComponentType) {
467 boolean hasLimits = false;
468 this.pattern = pattern;
469 this.checkComponentType = checkComponentType;
470
471 maxArrayLength = Long.MAX_VALUE; // Default values are unlimited
472 maxDepth = Long.MAX_VALUE;
473 maxReferences = Long.MAX_VALUE;
474 maxStreamBytes = Long.MAX_VALUE;
475
476 String[] patterns = pattern.split(";");
477 filters = new ArrayList<>(patterns.length);
478 for (int i = 0; i < patterns.length; i++) {
479 String p = patterns[i];
480 int nameLen = p.length();
481 if (nameLen == 0) {
482 continue;
483 }
484 if (parseLimit(p)) {
485 // If the pattern contained a limit setting, i.e. type=value
486 hasLimits = true;
487 continue;
488 }
489 boolean negate = p.charAt(0) == '!';
490 int poffset = negate ? 1 : 0;
491
492 // isolate module name, if any
493 int slash = p.indexOf('/', poffset);
494 if (slash == poffset) {
495 throw new IllegalArgumentException("module name is missing in: \"" + pattern + "\"");
496 }
497 final String moduleName = (slash >= 0) ? p.substring(poffset, slash) : null;
498 poffset = (slash >= 0) ? slash + 1 : poffset;
499
500 final Function<Class<?>, Status> patternFilter;
501 if (p.endsWith("*")) {
502 // Wildcard cases
503 if (p.endsWith(".*")) {
504 // Pattern is a package name with a wildcard
505 final String pkg = p.substring(poffset, nameLen - 2);
506 if (pkg.isEmpty()) {
507 throw new IllegalArgumentException("package missing in: \"" + pattern + "\"");
508 }
509 if (negate) {
510 // A Function that fails if the class starts with the pattern, otherwise don't care
511 patternFilter = c -> matchesPackage(c, pkg) ? Status.REJECTED : Status.UNDECIDED;
512 } else {
513 // A Function that succeeds if the class starts with the pattern, otherwise don't care
514 patternFilter = c -> matchesPackage(c, pkg) ? Status.ALLOWED : Status.UNDECIDED;
515 }
516 } else if (p.endsWith(".**")) {
517 // Pattern is a package prefix with a double wildcard
518 final String pkgs = p.substring(poffset, nameLen - 2);
519 if (pkgs.length() < 2) {
520 throw new IllegalArgumentException("package missing in: \"" + pattern + "\"");
521 }
522 if (negate) {
523 // A Function that fails if the class starts with the pattern, otherwise don't care
524 patternFilter = c -> c.getName().startsWith(pkgs) ? Status.REJECTED : Status.UNDECIDED;
525 } else {
526 // A Function that succeeds if the class starts with the pattern, otherwise don't care
527 patternFilter = c -> c.getName().startsWith(pkgs) ? Status.ALLOWED : Status.UNDECIDED;
528 }
529 } else {
530 // Pattern is a classname (possibly empty) with a trailing wildcard
531 final String className = p.substring(poffset, nameLen - 1);
532 if (negate) {
533 // A Function that fails if the class starts with the pattern, otherwise don't care
534 patternFilter = c -> c.getName().startsWith(className) ? Status.REJECTED : Status.UNDECIDED;
535 } else {
536 // A Function that succeeds if the class starts with the pattern, otherwise don't care
537 patternFilter = c -> c.getName().startsWith(className) ? Status.ALLOWED : Status.UNDECIDED;
538 }
539 }
540 } else {
541 final String name = p.substring(poffset);
542 if (name.isEmpty()) {
543 throw new IllegalArgumentException("class or package missing in: \"" + pattern + "\"");
544 }
545 // Pattern is a class name
546 if (negate) {
547 // A Function that fails if the class equals the pattern, otherwise don't care
548 patternFilter = c -> c.getName().equals(name) ? Status.REJECTED : Status.UNDECIDED;
549 } else {
550 // A Function that succeeds if the class equals the pattern, otherwise don't care
551 patternFilter = c -> c.getName().equals(name) ? Status.ALLOWED : Status.UNDECIDED;
552 }
553 }
554 // If there is a moduleName, combine the module name check with the package/class check
555 if (moduleName == null) {
556 filters.add(patternFilter);
557 } else {
558 filters.add(c -> moduleName.equals(c.getModule().getName()) ? patternFilter.apply(c) : Status.UNDECIDED);
559 }
560 }
561 if (filters.isEmpty() && !hasLimits) {
562 throw new UnsupportedOperationException("no non-empty patterns");
563 }
564 }
565
566 /**
567 * Parse out a limit for one of maxarray, maxdepth, maxbytes, maxreferences.
568 *
569 * @param pattern a string with a type name, '=' and a value
570 * @return {@code true} if a limit was parsed, else {@code false}
571 * @throws IllegalArgumentException if the pattern is missing
572 * the name, the Long value is not a number or is negative.
573 */
574 private boolean parseLimit(String pattern) {
575 int eqNdx = pattern.indexOf('=');
576 if (eqNdx < 0) {
577 // not a limit pattern
578 return false;
579 }
580 String valueString = pattern.substring(eqNdx + 1);
581 if (pattern.startsWith("maxdepth=")) {
582 maxDepth = parseValue(valueString);
583 } else if (pattern.startsWith("maxarray=")) {
584 maxArrayLength = parseValue(valueString);
585 } else if (pattern.startsWith("maxrefs=")) {
586 maxReferences = parseValue(valueString);
587 } else if (pattern.startsWith("maxbytes=")) {
588 maxStreamBytes = parseValue(valueString);
589 } else {
590 throw new IllegalArgumentException("unknown limit: " + pattern.substring(0, eqNdx));
591 }
592 return true;
593 }
594
595 /**
596 * Parse the value of a limit and check that it is non-negative.
597 * @param string inputstring
598 * @return the parsed value
599 * @throws IllegalArgumentException if parsing the value fails or the value is negative
600 */
601 private static long parseValue(String string) throws IllegalArgumentException {
602 // Parse a Long from after the '=' to the end
603 long value = Long.parseLong(string);
604 if (value < 0) {
605 throw new IllegalArgumentException("negative limit: " + string);
606 }
607 return value;
608 }
609
610 /**
611 * {@inheritDoc}
612 */
613 @Override
614 public Status checkInput(FilterInfo filterInfo) {
615 if (filterInfo.references() < 0
616 || filterInfo.depth() < 0
617 || filterInfo.streamBytes() < 0
618 || filterInfo.references() > maxReferences
619 || filterInfo.depth() > maxDepth
620 || filterInfo.streamBytes() > maxStreamBytes) {
621 return Status.REJECTED;
622 }
623
624 Class<?> clazz = filterInfo.serialClass();
625 if (clazz != null) {
626 if (clazz.isArray()) {
627 if (filterInfo.arrayLength() >= 0 && filterInfo.arrayLength() > maxArrayLength) {
628 // array length is too big
629 return Status.REJECTED;
630 }
631 if (!checkComponentType) {
632 // As revised; do not check the component type for arrays
633 return Status.UNDECIDED;
634 }
635 do {
636 // Arrays are decided based on the component type
637 clazz = clazz.getComponentType();
638 } while (clazz.isArray());
639 }
640
641 if (clazz.isPrimitive()) {
642 // Primitive types are undecided; let someone else decide
643 return Status.UNDECIDED;
644 } else {
645 // Find any filter that allowed or rejected the class
646 final Class<?> cl = clazz;
647 Optional<Status> status = filters.stream()
648 .map(f -> f.apply(cl))
649 .filter(p -> p != Status.UNDECIDED)
650 .findFirst();
651 return status.orElse(Status.UNDECIDED);
652 }
653 }
654 return Status.UNDECIDED;
655 }
656
657 /**
658 * Returns {@code true} if the class is in the package.
659 *
660 * @param c a class
661 * @param pkg a package name
662 * @return {@code true} if the class is in the package,
663 * otherwise {@code false}
664 */
665 private static boolean matchesPackage(Class<?> c, String pkg) {
666 return pkg.equals(c.getPackageName());
667 }
668
669 /**
670 * Returns the pattern used to create this filter.
671 * @return the pattern used to create this filter
672 */
673 @Override
674 public String toString() {
675 return pattern;
676 }
677 }
678 }
679 }