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/*
* Copyright (C) 2012 The Guava Authors
*
* 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.google.common.reflect;
import static com.google.common.base.Preconditions.checkNotNull;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import javax.annotation.Nullable;
/**
* Represents either a {@link Field}, a {@link Method} or a {@link Constructor}.
* Provides convenience methods such as {@link #isPublic} and {@link #isPackagePrivate}.
*
* @author Ben Yu
*/
class Element extends AccessibleObject implements Member {
private final AccessibleObject accessibleObject;
private final Member member;
<M extends AccessibleObject & Member> Element(M member) {
checkNotNull(member);
this.accessibleObject = member;
this.member = member;
}
@Override public final boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
return accessibleObject.isAnnotationPresent(annotationClass);
}
@Override public final <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
return accessibleObject.getAnnotation(annotationClass);
}
@Override public final Annotation[] getAnnotations() {
return accessibleObject.getAnnotations();
}
@Override public final Annotation[] getDeclaredAnnotations() {
return accessibleObject.getDeclaredAnnotations();
}
@Override public final void setAccessible(boolean flag) throws SecurityException {
accessibleObject.setAccessible(flag);
}
@Override public final boolean isAccessible() {
return accessibleObject.isAccessible();
}
@Override public Class<?> getDeclaringClass() {
return member.getDeclaringClass();
}
@Override public final String getName() {
return member.getName();
}
@Override public final int getModifiers() {
return member.getModifiers();
}
@Override public final boolean isSynthetic() {
return member.isSynthetic();
}
/** Returns true if the element is public. */
public final boolean isPublic() {
return Modifier.isPublic(getModifiers());
}
/** Returns true if the element is protected. */
public final boolean isProtected() {
return Modifier.isProtected(getModifiers());
}
/** Returns true if the element is package-private. */
public final boolean isPackagePrivate() {
return !isPrivate() && !isPublic() && !isProtected();
}
/** Returns true if the element is private. */
public final boolean isPrivate() {
return Modifier.isPrivate(getModifiers());
}
/** Returns true if the element is static. */
public final boolean isStatic() {
return Modifier.isStatic(getModifiers());
}
/**
* Returns {@code true} if this method is final, per {@code Modifier.isFinal(getModifiers())}.
*
* <p>Note that a method may still be effectively "final", or non-overridable when it has no
* {@code final} keyword. For example, it could be private, or it could be declared by a final
* class. To tell whether a method is overridable, use {@link Invokable#isOverridable}.
*/
public final boolean isFinal() {
return Modifier.isFinal(getModifiers());
}
/** Returns true if the method is abstract. */
public final boolean isAbstract() {
return Modifier.isAbstract(getModifiers());
}
/** Returns true if the element is native. */
public final boolean isNative() {
return Modifier.isNative(getModifiers());
}
/** Returns true if the method is synchronized. */
public final boolean isSynchronized() {
return Modifier.isSynchronized(getModifiers());
}
/** Returns true if the field is volatile. */
final boolean isVolatile() {
return Modifier.isVolatile(getModifiers());
}
/** Returns true if the field is transient. */
final boolean isTransient() {
return Modifier.isTransient(getModifiers());
}
@Override public boolean equals(@Nullable Object obj) {
if (obj instanceof Element) {
Element that = (Element) obj;
return member.equals(that.member);
}
return false;
}
@Override public int hashCode() {
return member.hashCode();
}
@Override public String toString() {
return member.toString();
}
}
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