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The official Couchbase JVM Core IO Library
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* 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 net.bytebuddy.description.modifier;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.jar.asm.Opcodes;
import java.util.Arrays;
import java.util.Collection;
/**
* An element that describes a type modifier as described in the
* JVMS.
*
* This allows for a more expressive and type safe alternative of defining a type's or type member's modifiers.
* However, note that modifier's that apply competing modifiers (such as {@code private} and {@code protected}
* should not be combined and will result in invalid types. An exception is thrown when built-in modifiers that
* cannot be combined are used together.
*/
public interface ModifierContributor {
/**
* The empty modifier.
*/
int EMPTY_MASK = 0;
/**
* Returns the mask of this modifier.
*
* @return The modifier mask that is to be applied to the target type or type member.
*/
int getMask();
/**
* Returns the entire range of modifiers that address this contributor's property.
*
* @return The range of this contributor's property.
*/
int getRange();
/**
* Determines if this is the default modifier.
*
* @return {@code true} if this contributor represents the default modifier.
*/
boolean isDefault();
/**
* A marker interface for modifiers that can be applied to types.
*/
interface ForType extends ModifierContributor {
/**
* A mask for all legal modifiers of a Java type.
*/
int MASK = Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED | Opcodes.ACC_PRIVATE | Opcodes.ACC_SYNTHETIC
| Opcodes.ACC_ABSTRACT | Opcodes.ACC_INTERFACE | Opcodes.ACC_ANNOTATION | Opcodes.ACC_DEPRECATED
| Opcodes.ACC_ENUM | Opcodes.ACC_FINAL | Opcodes.ACC_STATIC;
}
/**
* A marker interface for modifiers that can be applied to fields.
*/
interface ForField extends ModifierContributor {
/**
* A mask for all legal modifiers of a Java field.
*/
int MASK = Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED | Opcodes.ACC_PRIVATE
| Opcodes.ACC_DEPRECATED | Opcodes.ACC_ENUM | Opcodes.ACC_FINAL | Opcodes.ACC_STATIC
| Opcodes.ACC_SYNTHETIC | Opcodes.ACC_TRANSIENT | Opcodes.ACC_VOLATILE;
}
/**
* A marker interface for modifiers that can be applied to methods.
*/
interface ForMethod extends ModifierContributor {
/**
* A mask for all legal modifiers of a Java method.
*/
int MASK = Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED | Opcodes.ACC_PRIVATE | Opcodes.ACC_SYNTHETIC
| Opcodes.ACC_BRIDGE | Opcodes.ACC_FINAL | Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT
| Opcodes.ACC_STATIC | Opcodes.ACC_STRICT | Opcodes.ACC_SYNCHRONIZED
| Opcodes.ACC_VARARGS;
}
/**
* A marker interface for modifiers that can be applied to method parameters.
*/
interface ForParameter extends ModifierContributor {
/**
* A mask for all legal modifiers of a Java parameter.
*/
int MASK = Opcodes.ACC_MANDATED | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
}
/**
* A resolver for Java modifiers represented by {@link ModifierContributor}s.
*
* @param The type of the {@link ModifierContributor}s being resolved.
*/
@HashCodeAndEqualsPlugin.Enhance
class Resolver {
/**
* The modifier contributors to resolve.
*/
private final Collection modifierContributors;
/**
* Creates a new resolver.
*
* @param modifierContributors The modifier contributors to resolve.
*/
protected Resolver(Collection modifierContributors) {
this.modifierContributors = modifierContributors;
}
/**
* Creates a new resolver for modifier contributors to a type.
*
* @param modifierContributor The modifier contributors to resolve.
* @return A resolver for the provided modifier contributors.
*/
public static Resolver of(ForType... modifierContributor) {
return of(Arrays.asList(modifierContributor));
}
/**
* Creates a new resolver for modifier contributors to a field.
*
* @param modifierContributor The modifier contributors to resolve.
* @return A resolver for the provided modifier contributors.
*/
public static Resolver of(ForField... modifierContributor) {
return of(Arrays.asList(modifierContributor));
}
/**
* Creates a new resolver for modifier contributors to a method.
*
* @param modifierContributor The modifier contributors to resolve.
* @return A resolver for the provided modifier contributors.
*/
public static Resolver of(ForMethod... modifierContributor) {
return of(Arrays.asList(modifierContributor));
}
/**
* Creates a new resolver for modifier contributors to a parameter.
*
* @param modifierContributor The modifier contributors to resolve.
* @return A resolver for the provided modifier contributors.
*/
public static Resolver of(ForParameter... modifierContributor) {
return Resolver.of(Arrays.asList(modifierContributor));
}
/**
* Creates a new resolver for any modifier contributor of a given type.
*
* @param modifierContributors The modifier contributors to resolve.
* @param The modifier contributors type.
* @return A resolver for the provided modifier contributors.
*/
public static Resolver of(Collection modifierContributors) {
return new Resolver(modifierContributors);
}
/**
* Resolves the modifier contributors based on a zero modifier.
*
* @return The resolved modifiers.
*/
public int resolve() {
return resolve(EMPTY_MASK);
}
/**
* Resolves the modifier contributors based on a given modifier.
*
* @param modifiers The base modifiers.
* @return The resolved modifiers.
*/
public int resolve(int modifiers) {
for (T modifierContributor : modifierContributors) {
modifiers = (modifiers & ~modifierContributor.getRange()) | modifierContributor.getMask();
}
return modifiers;
}
}
}
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