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refactor: introduce ModifierTarget for better dealing with modifiers (#…
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153 changes: 153 additions & 0 deletions
153
src/main/java/spoon/support/compiler/jdt/ModifierTarget.java
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| @@ -0,0 +1,153 @@ | ||
| /* | ||
| * SPDX-License-Identifier: (MIT OR CECILL-C) | ||
| * | ||
| * Copyright (C) 2006-2019 INRIA and contributors | ||
| * | ||
| * Spoon is available either under the terms of the MIT License (see LICENSE-MIT.txt) of the Cecill-C License (see LICENSE-CECILL-C.txt). You as the user are entitled to choose the terms under which to adopt Spoon. | ||
| */ | ||
| package spoon.support.compiler.jdt; | ||
|
|
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| import spoon.reflect.declaration.ModifierKind; | ||
|
|
||
| import java.util.Collections; | ||
| import java.util.EnumSet; | ||
| import java.util.Set; | ||
|
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| /** | ||
| * Defines the elements that can have modifiers assigned to them. | ||
| * <p> | ||
| * Each target as a set of modifiers that are allowed on it. For example, | ||
| * a local variable can only have the {@code final} modifier, while this modifier | ||
| * is not allowed on constructors. | ||
| */ | ||
| enum ModifierTarget { | ||
| /** | ||
| * JLS $ 8.3.1 | ||
| */ | ||
| FIELD( | ||
| ModifierKind.PUBLIC, | ||
| ModifierKind.PROTECTED, | ||
| ModifierKind.PRIVATE, | ||
| ModifierKind.STRICTFP, | ||
| ModifierKind.FINAL, | ||
| ModifierKind.TRANSIENT, | ||
| ModifierKind.VOLATILE | ||
| ), | ||
| /** | ||
| * JLS $ 8.4.1 | ||
| */ | ||
| LOCAL_VARIABLE(ModifierKind.FINAL), | ||
| /** | ||
| * JLS $ 8.4.3 | ||
| */ | ||
| METHOD( | ||
| ModifierKind.PUBLIC, | ||
| ModifierKind.PROTECTED, | ||
| ModifierKind.PRIVATE, | ||
| ModifierKind.ABSTRACT, | ||
| ModifierKind.STATIC, | ||
| ModifierKind.FINAL, | ||
| ModifierKind.SYNCHRONIZED, | ||
| ModifierKind.NATIVE, | ||
| ModifierKind.STRICTFP | ||
| ), | ||
| /** | ||
| * JLS $ 8.8.3 | ||
| */ | ||
| CONSTRUCTOR( | ||
| ModifierKind.PUBLIC, | ||
| ModifierKind.PROTECTED, | ||
| ModifierKind.PRIVATE | ||
| ), | ||
| /** | ||
| * JLS $ 8.1.1 | ||
| */ | ||
| CLASS( | ||
| ModifierKind.PUBLIC, | ||
| ModifierKind.PROTECTED, | ||
| ModifierKind.PRIVATE, | ||
| ModifierKind.ABSTRACT, | ||
| ModifierKind.STATIC, | ||
| ModifierKind.FINAL, | ||
| ModifierKind.STRICTFP | ||
| ), | ||
|
|
||
| /** | ||
| * JLS $ 9.1.1 | ||
| */ | ||
| INTERFACE( | ||
| ModifierKind.PUBLIC, | ||
| ModifierKind.PROTECTED, | ||
| ModifierKind.PRIVATE, | ||
| ModifierKind.ABSTRACT, | ||
| ModifierKind.STATIC, | ||
| ModifierKind.STRICTFP | ||
| ), | ||
| /** | ||
| * JLS $ 8.4.1 | ||
| */ | ||
| PARAMETER(ModifierKind.FINAL); | ||
|
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| private Set<ModifierTarget> singleton; | ||
| private final Set<ModifierKind> allowedKinds; | ||
|
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| /** | ||
| * Two parameters to make easy use of {@link EnumSet#of(Enum, Enum[])}. | ||
| * | ||
| * @param firstAllowed the first kind | ||
| * @param allowedKinds the remaining kind | ||
| */ | ||
| ModifierTarget(ModifierKind firstAllowed, ModifierKind... allowedKinds) { | ||
| this.allowedKinds = Collections.unmodifiableSet( | ||
| EnumSet.of(firstAllowed, allowedKinds) | ||
| ); | ||
| } | ||
|
|
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| /** | ||
| * Empty Set, used if no other target is fitting. | ||
| */ | ||
| public static final Set<ModifierTarget> NONE = Collections.emptySet(); | ||
|
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| /** | ||
| * A Set to target all kinds of variables. | ||
| */ | ||
| public static final Set<ModifierTarget> VARIABLE = Collections.unmodifiableSet( | ||
| EnumSet.of(FIELD, LOCAL_VARIABLE) | ||
| ); | ||
|
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| /** | ||
| * A set to target all kinds of executables. | ||
| */ | ||
| public static final Set<ModifierTarget> EXECUTABLE = Collections.unmodifiableSet( | ||
| EnumSet.of(METHOD, CONSTRUCTOR) | ||
| ); | ||
|
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| /** | ||
| * A set to target all kinds of types. | ||
| */ | ||
| public static final Set<ModifierTarget> TYPE = Collections.unmodifiableSet( | ||
| EnumSet.of(CLASS, INTERFACE) | ||
| ); | ||
|
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| /** | ||
| * Returns an unmodifiable set containing only this target. | ||
| * | ||
| * @return a Set containing only this target. | ||
| */ | ||
| public Set<ModifierTarget> asSingleton() { | ||
| if (singleton == null) { | ||
| singleton = Collections.singleton(this); | ||
| } | ||
| return singleton; | ||
| } | ||
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| /** | ||
| * Returns a set of {@link ModifierKind}s that are allowed on this target. | ||
| * | ||
| * @return a set of allowed modifier kinds. | ||
| */ | ||
| public Set<ModifierKind> getAllowedKinds() { | ||
| return allowedKinds; | ||
| } | ||
| } |
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