526 lines
18 KiB
Java
526 lines
18 KiB
Java
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/*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.reflect;
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import java.util.StringJoiner;
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/**
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* The Modifier class provides {@code static} methods and
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* constants to decode class and member access modifiers. The sets of
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* modifiers are represented as integers with distinct bit positions
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* representing different modifiers. The values for the constants
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* representing the modifiers are taken from the tables in sections 4.1, 4.4, 4.5, and 4.7 of
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* <cite>The Java™ Virtual Machine Specification</cite>.
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*
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* @see Class#getModifiers()
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* @see Member#getModifiers()
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*
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* @author Nakul Saraiya
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* @author Kenneth Russell
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*/
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public class Modifier {
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// Android-removed: ReflectionFactory bootstrapping code not used on Android.
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/*
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/*
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* Bootstrapping protocol between java.lang and java.lang.reflect
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* packages
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*
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static {
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ReflectionFactory factory = AccessController.doPrivileged(
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new ReflectionFactory.GetReflectionFactoryAction());
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factory.setLangReflectAccess(new java.lang.reflect.ReflectAccess());
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}
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*/
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/**
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* Return {@code true} if the integer argument includes the
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* {@code public} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code public} modifier; {@code false} otherwise.
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*/
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public static boolean isPublic(int mod) {
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return (mod & PUBLIC) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code private} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code private} modifier; {@code false} otherwise.
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*/
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public static boolean isPrivate(int mod) {
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return (mod & PRIVATE) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code protected} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code protected} modifier; {@code false} otherwise.
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*/
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public static boolean isProtected(int mod) {
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return (mod & PROTECTED) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code static} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code static} modifier; {@code false} otherwise.
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*/
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public static boolean isStatic(int mod) {
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return (mod & STATIC) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code final} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code final} modifier; {@code false} otherwise.
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*/
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public static boolean isFinal(int mod) {
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return (mod & FINAL) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code synchronized} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code synchronized} modifier; {@code false} otherwise.
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*/
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public static boolean isSynchronized(int mod) {
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return (mod & SYNCHRONIZED) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code volatile} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code volatile} modifier; {@code false} otherwise.
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*/
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public static boolean isVolatile(int mod) {
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return (mod & VOLATILE) != 0;
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}
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// Android-added: isConstructor(int) to support DEX-defined modifier flag.
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/**
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* Returns true if the given modifiers contain {@link Modifier#CONSTRUCTOR}.
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* @hide
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*/
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public static boolean isConstructor(int modifiers) {
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return ((modifiers & Modifier.CONSTRUCTOR) != 0);
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code transient} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code transient} modifier; {@code false} otherwise.
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*/
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public static boolean isTransient(int mod) {
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return (mod & TRANSIENT) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code native} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code native} modifier; {@code false} otherwise.
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*/
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public static boolean isNative(int mod) {
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return (mod & NATIVE) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code interface} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code interface} modifier; {@code false} otherwise.
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*/
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public static boolean isInterface(int mod) {
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return (mod & INTERFACE) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code abstract} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code abstract} modifier; {@code false} otherwise.
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*/
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public static boolean isAbstract(int mod) {
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return (mod & ABSTRACT) != 0;
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}
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/**
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* Return {@code true} if the integer argument includes the
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* {@code strictfp} modifier, {@code false} otherwise.
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*
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* @param mod a set of modifiers
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* @return {@code true} if {@code mod} includes the
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* {@code strictfp} modifier; {@code false} otherwise.
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*/
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public static boolean isStrict(int mod) {
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return (mod & STRICT) != 0;
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}
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/**
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* Return a string describing the access modifier flags in
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* the specified modifier. For example:
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* <blockquote><pre>
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* public final synchronized strictfp
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* </pre></blockquote>
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* The modifier names are returned in an order consistent with the
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* suggested modifier orderings given in sections 8.1.1, 8.3.1, 8.4.3, 8.8.3, and 9.1.1 of
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* <cite>The Java™ Language Specification</cite>.
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* The full modifier ordering used by this method is:
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* <blockquote> {@code
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* public protected private abstract static final transient
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* volatile synchronized native strictfp
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* interface } </blockquote>
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* The {@code interface} modifier discussed in this class is
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* not a true modifier in the Java language and it appears after
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* all other modifiers listed by this method. This method may
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* return a string of modifiers that are not valid modifiers of a
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* Java entity; in other words, no checking is done on the
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* possible validity of the combination of modifiers represented
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* by the input.
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*
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* Note that to perform such checking for a known kind of entity,
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* such as a constructor or method, first AND the argument of
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* {@code toString} with the appropriate mask from a method like
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* {@link #constructorModifiers} or {@link #methodModifiers}.
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*
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* @param mod a set of modifiers
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* @return a string representation of the set of modifiers
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* represented by {@code mod}
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*/
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public static String toString(int mod) {
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StringJoiner sj = new StringJoiner(" ");
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if ((mod & PUBLIC) != 0) sj.add("public");
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if ((mod & PROTECTED) != 0) sj.add("protected");
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if ((mod & PRIVATE) != 0) sj.add("private");
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/* Canonical order */
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if ((mod & ABSTRACT) != 0) sj.add("abstract");
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if ((mod & STATIC) != 0) sj.add("static");
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if ((mod & FINAL) != 0) sj.add("final");
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if ((mod & TRANSIENT) != 0) sj.add("transient");
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if ((mod & VOLATILE) != 0) sj.add("volatile");
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if ((mod & SYNCHRONIZED) != 0) sj.add("synchronized");
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if ((mod & NATIVE) != 0) sj.add("native");
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if ((mod & STRICT) != 0) sj.add("strictfp");
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if ((mod & INTERFACE) != 0) sj.add("interface");
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return sj.toString();
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}
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/*
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* Access modifier flag constants from tables 4.1, 4.4, 4.5, and 4.7 of
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* <cite>The Java™ Virtual Machine Specification</cite>
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*/
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/**
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* The {@code int} value representing the {@code public}
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* modifier.
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*/
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public static final int PUBLIC = 0x00000001;
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/**
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* The {@code int} value representing the {@code private}
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* modifier.
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*/
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public static final int PRIVATE = 0x00000002;
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/**
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* The {@code int} value representing the {@code protected}
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* modifier.
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*/
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public static final int PROTECTED = 0x00000004;
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/**
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* The {@code int} value representing the {@code static}
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* modifier.
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*/
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public static final int STATIC = 0x00000008;
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/**
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* The {@code int} value representing the {@code final}
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* modifier.
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*/
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public static final int FINAL = 0x00000010;
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/**
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* The {@code int} value representing the {@code synchronized}
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* modifier.
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*/
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public static final int SYNCHRONIZED = 0x00000020;
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/**
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* The {@code int} value representing the {@code volatile}
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* modifier.
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*/
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public static final int VOLATILE = 0x00000040;
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/**
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* The {@code int} value representing the {@code transient}
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* modifier.
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*/
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public static final int TRANSIENT = 0x00000080;
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/**
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* The {@code int} value representing the {@code native}
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* modifier.
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*/
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public static final int NATIVE = 0x00000100;
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/**
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* The {@code int} value representing the {@code interface}
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* modifier.
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*/
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public static final int INTERFACE = 0x00000200;
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/**
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* The {@code int} value representing the {@code abstract}
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* modifier.
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*/
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public static final int ABSTRACT = 0x00000400;
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/**
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* The {@code int} value representing the {@code strictfp}
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* modifier.
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*/
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public static final int STRICT = 0x00000800;
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// Bits not (yet) exposed in the public API either because they
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// have different meanings for fields and methods and there is no
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// way to distinguish between the two in this class, or because
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// they are not Java programming language keywords
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static final int BRIDGE = 0x00000040;
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static final int VARARGS = 0x00000080;
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// Android-changed: SYNTHETIC made public for use in tests.
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/**
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* @hide
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*/
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public static final int SYNTHETIC = 0x00001000;
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static final int ANNOTATION = 0x00002000;
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static final int ENUM = 0x00004000;
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static final int MANDATED = 0x00008000;
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static boolean isSynthetic(int mod) {
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return (mod & SYNTHETIC) != 0;
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}
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static boolean isMandated(int mod) {
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return (mod & MANDATED) != 0;
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}
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// Note on the FOO_MODIFIERS fields and fooModifiers() methods:
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// the sets of modifiers are not guaranteed to be constants
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// across time and Java SE releases. Therefore, it would not be
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// appropriate to expose an external interface to this information
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// that would allow the values to be treated as Java-level
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// constants since the values could be constant folded and updates
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// to the sets of modifiers missed. Thus, the fooModifiers()
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// methods return an unchanging values for a given release, but a
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// value that can potentially change over time.
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// Android-added: CONSTRUCTOR to support DEX-defined modifier flag.
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/**
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* Dex addition to mark instance constructors and static class
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* initializer methods.
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* @hide
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||
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*/
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public static final int CONSTRUCTOR = 0x10000;
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|
|
|
||
|
|
// Android-added: DEFAULT to support DEX-defined modifier flag.
|
||
|
|
/**
|
||
|
|
* Default methods are marked with a synthetic access flag
|
||
|
|
* to speed up class loading and invocation target lookup.
|
||
|
|
* Implies INTERFACE, not-ABSTRACT, and not-STATIC.
|
||
|
|
*
|
||
|
|
* @hide
|
||
|
|
*/
|
||
|
|
public static final int DEFAULT = 0x00400000;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to a class.
|
||
|
|
* @jls 8.1.1 Class Modifiers
|
||
|
|
*/
|
||
|
|
private static final int CLASS_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE |
|
||
|
|
Modifier.ABSTRACT | Modifier.STATIC | Modifier.FINAL |
|
||
|
|
Modifier.STRICT;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to an interface.
|
||
|
|
* @jls 9.1.1 Interface Modifiers
|
||
|
|
*/
|
||
|
|
private static final int INTERFACE_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE |
|
||
|
|
Modifier.ABSTRACT | Modifier.STATIC | Modifier.STRICT;
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to a constructor.
|
||
|
|
* @jls 8.8.3 Constructor Modifiers
|
||
|
|
*/
|
||
|
|
private static final int CONSTRUCTOR_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to a method.
|
||
|
|
* @jls8.4.3 Method Modifiers
|
||
|
|
*/
|
||
|
|
private static final int METHOD_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE |
|
||
|
|
Modifier.ABSTRACT | Modifier.STATIC | Modifier.FINAL |
|
||
|
|
Modifier.SYNCHRONIZED | Modifier.NATIVE | Modifier.STRICT;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to a field.
|
||
|
|
* @jls 8.3.1 Field Modifiers
|
||
|
|
*/
|
||
|
|
private static final int FIELD_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE |
|
||
|
|
Modifier.STATIC | Modifier.FINAL | Modifier.TRANSIENT |
|
||
|
|
Modifier.VOLATILE;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The Java source modifiers that can be applied to a method or constructor parameter.
|
||
|
|
* @jls 8.4.1 Formal Parameters
|
||
|
|
*/
|
||
|
|
private static final int PARAMETER_MODIFIERS =
|
||
|
|
Modifier.FINAL;
|
||
|
|
|
||
|
|
/**
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
static final int ACCESS_MODIFIERS =
|
||
|
|
Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a class.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a class.
|
||
|
|
*
|
||
|
|
* @jls 8.1.1 Class Modifiers
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public static int classModifiers() {
|
||
|
|
return CLASS_MODIFIERS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to an interface.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to an interface.
|
||
|
|
*
|
||
|
|
* @jls 9.1.1 Interface Modifiers
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public static int interfaceModifiers() {
|
||
|
|
return INTERFACE_MODIFIERS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a constructor.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a constructor.
|
||
|
|
*
|
||
|
|
* @jls 8.8.3 Constructor Modifiers
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public static int constructorModifiers() {
|
||
|
|
return CONSTRUCTOR_MODIFIERS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a method.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a method.
|
||
|
|
*
|
||
|
|
* @jls 8.4.3 Method Modifiers
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public static int methodModifiers() {
|
||
|
|
return METHOD_MODIFIERS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a field.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a field.
|
||
|
|
*
|
||
|
|
* @jls 8.3.1 Field Modifiers
|
||
|
|
* @since 1.7
|
||
|
|
*/
|
||
|
|
public static int fieldModifiers() {
|
||
|
|
return FIELD_MODIFIERS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a parameter.
|
||
|
|
* @return an {@code int} value OR-ing together the source language
|
||
|
|
* modifiers that can be applied to a parameter.
|
||
|
|
*
|
||
|
|
* @jls 8.4.1 Formal Parameters
|
||
|
|
* @since 1.8
|
||
|
|
*/
|
||
|
|
public static int parameterModifiers() {
|
||
|
|
return PARAMETER_MODIFIERS;
|
||
|
|
}
|
||
|
|
}
|