1 /*
  2  * Copyright (c) 1999, 2025, 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 com.sun.tools.javac.code;
 27 
 28 import java.util.Collections;
 29 import java.util.EnumSet;
 30 import java.util.Map;
 31 import java.util.Set;
 32 import java.util.concurrent.ConcurrentHashMap;
 33 import java.util.stream.Collectors;
 34 
 35 import javax.lang.model.element.Modifier;
 36 
 37 import com.sun.tools.javac.util.Assert;
 38 import com.sun.tools.javac.util.StringUtils;
 39 
 40 /** Access flags and other modifiers for Java classes and members.
 41  *
 42  *  <p><b>This is NOT part of any supported API.
 43  *  If you write code that depends on this, you do so at your own risk.
 44  *  This code and its internal interfaces are subject to change or
 45  *  deletion without notice.</b>
 46  */
 47 public class Flags {
 48 
 49     private Flags() {} // uninstantiable
 50 
 51     public static String toString(long flags) {
 52         StringBuilder buf = new StringBuilder();
 53         String sep = "";
 54         for (Flag flag : asFlagSet(flags)) {
 55             buf.append(sep);
 56             buf.append(flag);
 57             sep = " ";
 58         }
 59         return buf.toString();
 60     }
 61 
 62     public static EnumSet<Flag> asFlagSet(long flags) {
 63         EnumSet<Flag> flagSet = EnumSet.noneOf(Flag.class);
 64         for (Flag flag : Flag.values()) {
 65             if ((flags & flag.value) != 0) {
 66                 flagSet.add(flag);
 67                 flags &= ~flag.value;
 68             }
 69         }
 70         Assert.check(flags == 0);
 71         return flagSet;
 72     }
 73 
 74     /* Standard Java flags.
 75      */
 76     public static final int PUBLIC       = 1;
 77     public static final int PRIVATE      = 1<<1;
 78     public static final int PROTECTED    = 1<<2;
 79     public static final int STATIC       = 1<<3;
 80     public static final int FINAL        = 1<<4;
 81     public static final int SYNCHRONIZED = 1<<5;
 82     public static final int VOLATILE     = 1<<6;
 83     public static final int TRANSIENT    = 1<<7;
 84     public static final int NATIVE       = 1<<8;
 85     public static final int INTERFACE    = 1<<9;
 86     public static final int ABSTRACT     = 1<<10;
 87     public static final int STRICTFP     = 1<<11;
 88 
 89     /* Flag that marks a symbol synthetic, added in classfile v49.0. */
 90     public static final int SYNTHETIC    = 1<<12;
 91 
 92     /** Flag that marks attribute interfaces, added in classfile v49.0. */
 93     public static final int ANNOTATION   = 1<<13;
 94 
 95     /** An enumeration type or an enumeration constant, added in
 96      *  classfile v49.0. */
 97     public static final int ENUM         = 1<<14;
 98 
 99     /** Added in SE8, represents constructs implicitly declared in source. */
100     public static final int MANDATED     = 1<<15;
101 
102     public static final int StandardFlags = 0x0fff;
103 
104     // Because the following access flags are overloaded with other
105     // bit positions, we translate them when reading and writing class
106     // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
107     // for example.
108     public static final int ACC_IDENTITY = 0x0020;
109     public static final int ACC_BRIDGE   = 0x0040;
110     public static final int ACC_VARARGS  = 0x0080;
111     public static final int ACC_STRICT   = 0x0800;
112     public static final int ACC_MODULE   = 0x8000;
113 
114     /* ***************************************
115      * Internal compiler flags (no bits in the lower 16).
116      *****************************************/
117 
118     /** Flag is set if symbol is deprecated.  See also DEPRECATED_REMOVAL.
119      */
120     public static final int DEPRECATED   = 1<<17;
121 
122     /** Flag is set for a variable symbol if the variable's definition
123      *  has an initializer part.
124      */
125     public static final int HASINIT          = 1<<18;
126 
127     /** Flag is set for a class or interface whose instances have identity
128      * i.e. any concrete class not declared with the modifier `value'
129      * (a) abstract class not declared `value'
130      * (b) older class files with ACC_SUPER bit set
131      */
132     public static final int IDENTITY_TYPE            = 1<<19;
133 
134     /** Class is an implicitly declared top level class.
135      */
136     public static final int IMPLICIT_CLASS    = 1<<23;
137 
138     /** Flag is set for compiler-generated anonymous method symbols
139      *  that `own' an initializer block.
140      */
141     public static final int BLOCK            = 1<<20;
142 
143     /** Marks a type as a value class */
144     public static final int VALUE_CLASS      = 1<<20;
145 
146     /** Flag is set for ClassSymbols that are being compiled from source.
147      */
148     public static final int FROM_SOURCE      = 1<<21; //ClassSymbols
149 
150     /** Flag is set for nested classes that do not access instance members
151      *  or `this' of an outer class and therefore don't need to be passed
152      *  a this$n reference.  This value is currently set only for anonymous
153      *  classes in superclass constructor calls.
154      *  todo: use this value for optimizing away this$n parameters in
155      *  other cases.
156      */
157     public static final int NOOUTERTHIS  = 1<<22;
158 
159     /** Flag is set for package symbols if a package has a member or
160      *  directory and therefore exists.
161      */
162     public static final int EXISTS           = 1<<23;
163 
164     /** Flag is set for compiler-generated compound classes
165      *  representing multiple variable bounds
166      */
167     public static final int COMPOUND     = 1<<24;
168 
169     /** Flag is set for class symbols if a class file was found for this class.
170      */
171     public static final int CLASS_SEEN   = 1<<25;
172 
173     /** Flag is set for class symbols if a source file was found for this
174      *  class.
175      */
176     public static final int SOURCE_SEEN  = 1<<26;
177 
178     /* State flags (are reset during compilation).
179      */
180 
181     /** Flag for class symbols is set and later re-set as a lock in
182      *  Enter to detect cycles in the superclass/superinterface
183      *  relations.  Similarly for constructor call cycle detection in
184      *  Attr.
185      */
186     public static final int LOCKED           = 1<<27;
187 
188     /** Flag for class symbols is set and later re-set to indicate that a class
189      *  has been entered but has not yet been attributed.
190      */
191     public static final int UNATTRIBUTED = 1<<28;
192 
193     /** Flag for synthesized default constructors of anonymous classes.
194      */
195     public static final int ANONCONSTR   = 1<<29; //non-class members
196 
197     /**
198      * Flag to indicate the superclasses of this ClassSymbol has been attributed.
199      */
200     public static final int SUPER_OWNER_ATTRIBUTED = 1<<29; //ClassSymbols
201 
202     /** Flag for class symbols to indicate it has been checked and found
203      *  acyclic.
204      */
205     public static final int ACYCLIC          = 1<<30;
206 
207     /** Flag that marks bridge methods.
208      */
209     public static final long BRIDGE          = 1L<<31;
210 
211     /** Flag that marks formal parameters.
212      */
213     public static final long PARAMETER   = 1L<<33;
214 
215     /** Flag that marks varargs methods.
216      */
217     public static final long VARARGS   = 1L<<34;
218 
219     /** Flag for annotation type symbols to indicate it has been
220      *  checked and found acyclic.
221      */
222     public static final long ACYCLIC_ANN      = 1L<<35;
223 
224     /** Flag that marks a generated default constructor.
225      */
226     public static final long GENERATEDCONSTR   = 1L<<36;
227 
228     /** Flag that marks a hypothetical method that need not really be
229      *  generated in the binary, but is present in the symbol table to
230      *  simplify checking for erasure clashes - also used for 292 poly sig methods.
231      */
232     public static final long HYPOTHETICAL   = 1L<<37;
233 
234     /**
235      * Flag that marks an internal proprietary class.
236      */
237     public static final long PROPRIETARY = 1L<<38;
238 
239     /**
240      * Flag that marks a multi-catch parameter.
241      */
242     public static final long UNION = 1L<<39;
243 
244     /**
245      * Flags an erroneous TypeSymbol as viable for recovery.
246      * TypeSymbols only.
247      */
248     public static final long RECOVERABLE = 1L<<40;
249 
250     /**
251      * Flag that marks an 'effectively final' local variable.
252      */
253     public static final long EFFECTIVELY_FINAL = 1L<<41;
254 
255     /**
256      * Flag that marks non-override equivalent methods with the same signature,
257      * or a conflicting match binding (BindingSymbol).
258      */
259     public static final long CLASH = 1L<<42;
260 
261     /**
262      * Flag that marks either a default method or an interface containing default methods.
263      */
264     public static final long DEFAULT = 1L<<43;
265 
266     /**
267      * Flag that marks class as auxiliary, ie a non-public class following
268      * the public class in a source file, that could block implicit compilation.
269      */
270     public static final long AUXILIARY = 1L<<44;
271 
272     /**
273      * Flag that marks that a symbol is not available in the current profile
274      */
275     public static final long NOT_IN_PROFILE = 1L<<45;
276 
277     /**
278      * Flag that indicates that an override error has been detected by Check.
279      */
280     public static final long BAD_OVERRIDE = 1L<<45;
281 
282     /**
283      * Flag that indicates a signature polymorphic method (292).
284      */
285     public static final long SIGNATURE_POLYMORPHIC = 1L<<46;
286 
287     /**
288      * Flag that indicates that an inference variable is used in a 'throws' clause.
289      */
290     public static final long THROWS = 1L<<47;
291 
292     /*
293      * Currently available: Bit 48.
294      */
295 
296     /**
297      * Flag that marks a synthetic method body for a lambda expression
298      */
299     public static final long LAMBDA_METHOD = 1L<<49; //MethodSymbols only
300 
301     /**
302      * Flag that marks a synthetic local capture field in a local/anon class
303      */
304     public static final long LOCAL_CAPTURE_FIELD = 1L<<49; //VarSymbols only
305 
306     /**
307      * Flag to control recursion in TransTypes
308      */
309     public static final long TYPE_TRANSLATED = 1L<<50;
310 
311     /**
312      * Flag to indicate class symbol is for module-info
313      */
314     public static final long MODULE = 1L<<51;
315 
316     /**
317      * Flag to indicate the given ModuleSymbol is an automatic module.
318      */
319     public static final long AUTOMATIC_MODULE = 1L<<52; //ModuleSymbols only
320 
321     /**
322      * Flag to indicate the given PackageSymbol contains any non-.java and non-.class resources.
323      */
324     public static final long HAS_RESOURCE = 1L<<52; //PackageSymbols only
325 
326     /**
327      * Flag to indicate the given ParamSymbol has a user-friendly name filled.
328      */
329     public static final long NAME_FILLED = 1L<<52; //ParamSymbols only
330 
331     /**
332      * Flag to indicate the given ModuleSymbol is a system module.
333      */
334     public static final long SYSTEM_MODULE = 1L<<53; //ModuleSymbols only
335 
336     /**
337      * Flag to indicate the given ClassSymbol is a value based.
338      */
339     public static final long VALUE_BASED = 1L<<53; //ClassSymbols only
340 
341     /**
342      * Flag to indicate the given ClassSymbol is a value based.
343      */
344     public static final long MIGRATED_VALUE_CLASS = 1L<<57; //ClassSymbols only
345 
346     /**
347      * Flag to indicate the given symbol has a @Deprecated annotation.
348      */
349     public static final long DEPRECATED_ANNOTATION = 1L<<54;
350 
351     /**
352      * Flag to indicate the given symbol has been deprecated and marked for removal.
353      */
354     public static final long DEPRECATED_REMOVAL = 1L<<55;
355 
356     /**
357      * Flag to indicate the API element in question is for a preview API.
358      */
359     public static final long PREVIEW_API = 1L<<56; //any Symbol kind
360 
361     /**
362      * Flag for synthesized default constructors of anonymous classes that have an enclosing expression.
363      */
364     public static final long ANONCONSTR_BASED = 1L<<57;
365 
366     /**
367      * Flag that marks finalize block as body-only, should not be copied into catch clauses.
368      * Used to implement try-with-resources.
369      */
370     public static final long BODY_ONLY_FINALIZE = 1L<<17; //blocks only
371 
372     /**
373      * Flag to indicate the API element in question is for a preview API.
374      */
375     public static final long PREVIEW_REFLECTIVE = 1L<<58; //any Symbol kind
376 
377     /**
378      * Flag to indicate the given variable is a match binding variable.
379      */
380     public static final long MATCH_BINDING = 1L<<59;
381 
382     /**
383      * A flag to indicate a match binding variable whose scope extends after the current statement.
384      */
385     public static final long MATCH_BINDING_TO_OUTER = 1L<<60;
386 
387     /**
388      * Flag to indicate that a class is a record. The flag is also used to mark fields that are
389      * part of the state vector of a record and to mark the canonical constructor
390      */
391     public static final long RECORD = 1L<<61; // ClassSymbols, MethodSymbols and VarSymbols
392 
393     /**
394      * Flag to mark a record constructor as a compact one
395      */
396     public static final long COMPACT_RECORD_CONSTRUCTOR = 1L<<51; // MethodSymbols only
397 
398     /**
399      * Flag to mark a record field that was not initialized in the compact constructor
400      */
401     public static final long UNINITIALIZED_FIELD= 1L<<51; // VarSymbols only
402 
403     /** Flag is set for compiler-generated record members, it could be applied to
404      *  accessors and fields
405      */
406     public static final int GENERATED_MEMBER = 1<<24; // MethodSymbols and VarSymbols
407 
408     /**
409      * Flag to indicate sealed class/interface declaration.
410      */
411     public static final long SEALED = 1L<<62; // ClassSymbols
412 
413     /**
414      * Flag to indicate restricted method declaration.
415      */
416     public static final long RESTRICTED = 1L<<62; // MethodSymbols
417 
418     /**
419      * Flag to indicate type annotations have been queued for field initializers.
420      */
421     public static final long FIELD_INIT_TYPE_ANNOTATIONS_QUEUED = 1L<<53; // VarSymbols
422 
423     /**
424      * Flag to indicate that the class/interface was declared with the non-sealed modifier.
425      */
426     public static final long NON_SEALED = 1L<<63; // ClassSymbols
427 
428     /**
429      * Flag to indicate that a class has at least one strict field
430      */
431     public static final long HAS_STRICT = 1L<<52; // ClassSymbols, temporary hack
432 
433     /**
434      * Flag to indicate that a field is strict
435      */
436     public static final long STRICT = 1L<<53; // VarSymbols
437 
438     /**
439      * Describe modifier flags as they might appear in source code, i.e.,
440      * separated by spaces and in the order suggested by JLS 8.1.1.
441      */
442     public static String toSource(long flags) {
443         return asModifierSet(flags).stream()
444           .map(Modifier::toString)
445           .collect(Collectors.joining(" "));
446     }
447 
448     /** Modifier masks.
449      */
450     public static final int
451         AccessFlags                       = PUBLIC | PROTECTED | PRIVATE,
452         LocalClassFlags                   = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC | IDENTITY_TYPE,
453         StaticLocalClassFlags             = LocalClassFlags | STATIC | INTERFACE,
454         MemberClassFlags                  = LocalClassFlags | INTERFACE | AccessFlags,
455         MemberStaticClassFlags            = MemberClassFlags | STATIC,
456         ClassFlags                        = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
457         InterfaceVarFlags                 = FINAL | STATIC | PUBLIC,
458         VarFlags                          = AccessFlags | FINAL | STATIC |
459                                             VOLATILE | TRANSIENT | ENUM,
460         ConstructorFlags                  = AccessFlags,
461         InterfaceMethodFlags              = ABSTRACT | PUBLIC,
462         MethodFlags                       = AccessFlags | ABSTRACT | STATIC | NATIVE |
463                                             SYNCHRONIZED | FINAL | STRICTFP,
464         RecordMethodFlags                 = AccessFlags | ABSTRACT | STATIC |
465                                             SYNCHRONIZED | FINAL | STRICTFP;
466     public static final long
467         ExtendedStandardFlags             = (long)StandardFlags | DEFAULT | SEALED | NON_SEALED | VALUE_CLASS,
468         ExtendedMemberClassFlags          = (long)MemberClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
469         ExtendedMemberStaticClassFlags    = (long) MemberStaticClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
470         ExtendedClassFlags                = (long)ClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
471         ExtendedLocalClassFlags           = (long) LocalClassFlags | VALUE_CLASS,
472         ExtendedStaticLocalClassFlags     = (long) StaticLocalClassFlags | VALUE_CLASS,
473         ValueFieldFlags                   = (long) VarFlags | STRICT | FINAL,
474         ModifierFlags                     = ((long)StandardFlags & ~INTERFACE) | DEFAULT | SEALED | NON_SEALED | VALUE_CLASS,
475         InterfaceMethodMask               = ABSTRACT | PRIVATE | STATIC | PUBLIC | STRICTFP | DEFAULT,
476         AnnotationTypeElementMask         = ABSTRACT | PUBLIC,
477         LocalVarFlags                     = FINAL | PARAMETER,
478         ReceiverParamFlags                = PARAMETER;
479 
480     public static Set<Modifier> asModifierSet(long flags) {
481         Set<Modifier> modifiers = modifierSets.get(flags);
482         if (modifiers == null) {
483             modifiers = java.util.EnumSet.noneOf(Modifier.class);
484             if (0 != (flags & PUBLIC))    modifiers.add(Modifier.PUBLIC);
485             if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
486             if (0 != (flags & PRIVATE))   modifiers.add(Modifier.PRIVATE);
487             if (0 != (flags & ABSTRACT))  modifiers.add(Modifier.ABSTRACT);
488             if (0 != (flags & STATIC))    modifiers.add(Modifier.STATIC);
489             if (0 != (flags & SEALED))    modifiers.add(Modifier.SEALED);
490             if (0 != (flags & NON_SEALED))
491                                           modifiers.add(Modifier.NON_SEALED);
492             if (0 != (flags & FINAL))     modifiers.add(Modifier.FINAL);
493             if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
494             if (0 != (flags & VOLATILE))  modifiers.add(Modifier.VOLATILE);
495             if (0 != (flags & SYNCHRONIZED))
496                                           modifiers.add(Modifier.SYNCHRONIZED);
497             if (0 != (flags & NATIVE))    modifiers.add(Modifier.NATIVE);
498             if (0 != (flags & STRICTFP))  modifiers.add(Modifier.STRICTFP);
499             if (0 != (flags & DEFAULT))   modifiers.add(Modifier.DEFAULT);
500             if (0 != (flags & VALUE_CLASS))     modifiers.add(Modifier.VALUE);
501             modifiers = Collections.unmodifiableSet(modifiers);
502             modifierSets.put(flags, modifiers);
503         }
504         return modifiers;
505     }
506 
507     // Cache of modifier sets.
508     private static final Map<Long, Set<Modifier>> modifierSets = new ConcurrentHashMap<>(64);
509 
510     public static boolean isStatic(Symbol symbol) {
511         return (symbol.flags() & STATIC) != 0;
512     }
513 
514     public static boolean isEnum(Symbol symbol) {
515         return (symbol.flags() & ENUM) != 0;
516     }
517 
518     public static boolean isConstant(Symbol.VarSymbol symbol) {
519         return symbol.getConstValue() != null;
520     }
521 
522     public enum Flag {
523         PUBLIC(Flags.PUBLIC),
524         PRIVATE(Flags.PRIVATE),
525         PROTECTED(Flags.PROTECTED),
526         STATIC(Flags.STATIC),
527         FINAL(Flags.FINAL),
528         SYNCHRONIZED(Flags.SYNCHRONIZED),
529         VOLATILE(Flags.VOLATILE),
530         TRANSIENT(Flags.TRANSIENT),
531         NATIVE(Flags.NATIVE),
532         INTERFACE(Flags.INTERFACE),
533         ABSTRACT(Flags.ABSTRACT),
534         DEFAULT(Flags.DEFAULT),
535         STRICTFP(Flags.STRICTFP),
536         BRIDGE(Flags.BRIDGE),
537         SYNTHETIC(Flags.SYNTHETIC),
538         ANNOTATION(Flags.ANNOTATION),
539         DEPRECATED(Flags.DEPRECATED),
540         HASINIT(Flags.HASINIT),
541         IDENTITY_TYPE(Flags.IDENTITY_TYPE) {
542             @Override
543             public String toString() {
544                 return "identity";
545             }
546         },
547         VALUE(Flags.VALUE_CLASS),
548         IMPLICIT_CLASS(Flags.IMPLICIT_CLASS),
549         BLOCK(Flags.BLOCK),
550         FROM_SOURCE(Flags.FROM_SOURCE),
551         ENUM(Flags.ENUM),
552         MANDATED(Flags.MANDATED),
553         NOOUTERTHIS(Flags.NOOUTERTHIS),
554         EXISTS(Flags.EXISTS),
555         COMPOUND(Flags.COMPOUND),
556         CLASS_SEEN(Flags.CLASS_SEEN),
557         SOURCE_SEEN(Flags.SOURCE_SEEN),
558         LOCKED(Flags.LOCKED),
559         UNATTRIBUTED(Flags.UNATTRIBUTED),
560         ANONCONSTR(Flags.ANONCONSTR),
561         ACYCLIC(Flags.ACYCLIC),
562         PARAMETER(Flags.PARAMETER),
563         VARARGS(Flags.VARARGS),
564         ACYCLIC_ANN(Flags.ACYCLIC_ANN),
565         GENERATEDCONSTR(Flags.GENERATEDCONSTR),
566         HYPOTHETICAL(Flags.HYPOTHETICAL),
567         PROPRIETARY(Flags.PROPRIETARY),
568         UNION(Flags.UNION),
569         EFFECTIVELY_FINAL(Flags.EFFECTIVELY_FINAL),
570         CLASH(Flags.CLASH),
571         AUXILIARY(Flags.AUXILIARY),
572         NOT_IN_PROFILE(Flags.NOT_IN_PROFILE),
573         BAD_OVERRIDE(Flags.BAD_OVERRIDE),
574         SIGNATURE_POLYMORPHIC(Flags.SIGNATURE_POLYMORPHIC),
575         THROWS(Flags.THROWS),
576         LAMBDA_METHOD(Flags.LAMBDA_METHOD),
577         TYPE_TRANSLATED(Flags.TYPE_TRANSLATED),
578         MODULE(Flags.MODULE),
579         AUTOMATIC_MODULE(Flags.AUTOMATIC_MODULE),
580         SYSTEM_MODULE(Flags.SYSTEM_MODULE),
581         DEPRECATED_ANNOTATION(Flags.DEPRECATED_ANNOTATION),
582         DEPRECATED_REMOVAL(Flags.DEPRECATED_REMOVAL),
583         HAS_RESOURCE(Flags.HAS_RESOURCE),
584         // Bit 48 is currently available
585         ANONCONSTR_BASED(Flags.ANONCONSTR_BASED),
586         NAME_FILLED(Flags.NAME_FILLED),
587         PREVIEW_API(Flags.PREVIEW_API),
588         PREVIEW_REFLECTIVE(Flags.PREVIEW_REFLECTIVE),
589         MATCH_BINDING(Flags.MATCH_BINDING),
590         MATCH_BINDING_TO_OUTER(Flags.MATCH_BINDING_TO_OUTER),
591         RECORD(Flags.RECORD),
592         RECOVERABLE(Flags.RECOVERABLE),
593         SEALED(Flags.SEALED),
594         NON_SEALED(Flags.NON_SEALED) {
595             @Override
596             public String toString() {
597                 return "non-sealed";
598             }
599         },
600         STRICT(Flags.STRICT);
601 
602         Flag(long flag) {
603             this.value = flag;
604             this.lowercaseName = StringUtils.toLowerCase(name());
605         }
606 
607         @Override
608         public String toString() {
609             return lowercaseName;
610         }
611 
612         final long value;
613         final String lowercaseName;
614     }
615 
616 }