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Tom Tromey
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libjava/classpath/java/lang/reflect/Modifier.java
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libjava/classpath/java/lang/reflect/Modifier.java
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/* java.lang.reflect.Modifier
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Copyright (C) 1998, 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang.reflect;
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/**
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* Modifier is a helper class with static methods to determine whether an
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* int returned from getModifiers() represents static, public, protected,
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* native, final, etc... and provides an additional method to print
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* out all of the modifiers in an int in order.
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* <p>
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* The methods in this class use the bitmask values in the VM spec to
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* determine the modifiers of an int. This means that a VM must return a
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* standard mask, conformant with the VM spec. I don't know if this is how
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* Sun does it, but I'm willing to bet money that it is.
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*
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* @author John Keiser
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* @author Tom Tromey (tromey@cygnus.com)
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see Member#getModifiers()
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* @see Method#getModifiers()
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* @see Field#getModifiers()
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* @see Constructor#getModifiers()
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* @see Class#getModifiers()
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* @since 1.1
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*/
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public class Modifier
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{
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/** <STRONG>This constructor really shouldn't be here ... there are no
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* instance methods or variables of this class, so instantiation is
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* worthless. However, this function is in the 1.1 spec, so it is added
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* for completeness.</STRONG>
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*/
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public Modifier()
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{
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}
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/**
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* Public: accessible from any other class.
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*/
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public static final int PUBLIC = 0x0001;
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/**
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* Private: accessible only from the same enclosing class.
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*/
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public static final int PRIVATE = 0x0002;
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/**
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* Protected: accessible only to subclasses, or within the package.
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*/
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public static final int PROTECTED = 0x0004;
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/**
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* Static:<br><ul>
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* <li>Class: no enclosing instance for nested class.</li>
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* <li>Field or Method: can be accessed or invoked without an
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* instance of the declaring class.</li>
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* </ul>
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*/
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public static final int STATIC = 0x0008;
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/**
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* Final:<br><ul>
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* <li>Class: no subclasses allowed.</li>
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* <li>Field: cannot be changed.</li>
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* <li>Method: cannot be overriden.</li>
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* </ul>
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*/
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public static final int FINAL = 0x0010;
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/**
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* Synchronized: Method: lock the class while calling this method.
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*/
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public static final int SYNCHRONIZED = 0x0020;
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/**
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* Volatile: Field: cannot be cached.
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*/
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public static final int VOLATILE = 0x0040;
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/**
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* Transient: Field: not serialized or deserialized.
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*/
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public static final int TRANSIENT = 0x0080;
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/**
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* Native: Method: use JNI to call this method.
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*/
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public static final int NATIVE = 0x0100;
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/**
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* Interface: Class: is an interface.
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*/
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public static final int INTERFACE = 0x0200;
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/**
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* Abstract:<br><ul>
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* <li>Class: may not be instantiated.</li>
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* <li>Method: may not be called.</li>
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* </ul>
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*/
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public static final int ABSTRACT = 0x0400;
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/**
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* Strictfp: Method: expressions are FP-strict.<p>
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* Also used as a modifier for classes, to mean that all initializers
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* and constructors are FP-strict, but does not show up in
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* Class.getModifiers.
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*/
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public static final int STRICT = 0x0800;
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/**
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* Super - treat invokespecial as polymorphic so that super.foo() works
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* according to the JLS. This is a reuse of the synchronized constant
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* to patch a hole in JDK 1.0. *shudder*.
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*/
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static final int SUPER = 0x0020;
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/**
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* All the flags, only used by code in this package.
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*/
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static final int ALL_FLAGS = 0xfff;
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/**
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* Check whether the given modifier is abstract.
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* @param mod the modifier.
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* @return <code>true</code> if abstract, <code>false</code> otherwise.
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*/
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public static boolean isAbstract(int mod)
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{
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return (mod & ABSTRACT) != 0;
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}
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/**
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* Check whether the given modifier is final.
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* @param mod the modifier.
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* @return <code>true</code> if final, <code>false</code> otherwise.
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*/
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public static boolean isFinal(int mod)
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{
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return (mod & FINAL) != 0;
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}
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/**
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* Check whether the given modifier is an interface.
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* @param mod the modifier.
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* @return <code>true</code> if an interface, <code>false</code> otherwise.
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*/
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public static boolean isInterface(int mod)
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{
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return (mod & INTERFACE) != 0;
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}
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/**
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* Check whether the given modifier is native.
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* @param mod the modifier.
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* @return <code>true</code> if native, <code>false</code> otherwise.
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*/
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public static boolean isNative(int mod)
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{
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return (mod & NATIVE) != 0;
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}
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/**
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* Check whether the given modifier is private.
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* @param mod the modifier.
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* @return <code>true</code> if private, <code>false</code> otherwise.
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*/
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public static boolean isPrivate(int mod)
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{
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return (mod & PRIVATE) != 0;
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}
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/**
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* Check whether the given modifier is protected.
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* @param mod the modifier.
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* @return <code>true</code> if protected, <code>false</code> otherwise.
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*/
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public static boolean isProtected(int mod)
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{
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return (mod & PROTECTED) != 0;
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}
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/**
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* Check whether the given modifier is public.
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* @param mod the modifier.
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* @return <code>true</code> if public, <code>false</code> otherwise.
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*/
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public static boolean isPublic(int mod)
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{
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return (mod & PUBLIC) != 0;
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}
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/**
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* Check whether the given modifier is static.
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* @param mod the modifier.
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* @return <code>true</code> if static, <code>false</code> otherwise.
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*/
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public static boolean isStatic(int mod)
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{
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return (mod & STATIC) != 0;
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}
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/**
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* Check whether the given modifier is strictfp.
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* @param mod the modifier.
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* @return <code>true</code> if strictfp, <code>false</code> otherwise.
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*/
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public static boolean isStrict(int mod)
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{
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return (mod & STRICT) != 0;
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}
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/**
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* Check whether the given modifier is synchronized.
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* @param mod the modifier.
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* @return <code>true</code> if synchronized, <code>false</code> otherwise.
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*/
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public static boolean isSynchronized(int mod)
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{
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return (mod & SYNCHRONIZED) != 0;
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}
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/**
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* Check whether the given modifier is transient.
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* @param mod the modifier.
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* @return <code>true</code> if transient, <code>false</code> otherwise.
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*/
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public static boolean isTransient(int mod)
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{
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return (mod & TRANSIENT) != 0;
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}
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/**
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* Check whether the given modifier is volatile.
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* @param mod the modifier.
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* @return <code>true</code> if volatile, <code>false</code> otherwise.
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*/
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public static boolean isVolatile(int mod)
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{
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return (mod & VOLATILE) != 0;
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}
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/**
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* Get a string representation of all the modifiers represented by the
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* given int. The keywords are printed in this order:
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* <code><public|protected|private> abstract static final transient
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* volatile synchronized native strictfp interface</code>.
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*
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* @param mod the modifier.
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* @return the String representing the modifiers.
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*/
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public static String toString(int mod)
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{
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return toString(mod, new StringBuffer()).toString();
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}
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/**
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* Package helper method that can take a StringBuffer.
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* @param mod the modifier
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* @param r the StringBuffer to which the String representation is appended
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* @return r, with information appended
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*/
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static StringBuffer toString(int mod, StringBuffer r)
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{
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if (isPublic(mod))
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r.append("public ");
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if (isProtected(mod))
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r.append("protected ");
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if (isPrivate(mod))
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r.append("private ");
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if (isAbstract(mod))
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r.append("abstract ");
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if (isStatic(mod))
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r.append("static ");
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if (isFinal(mod))
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r.append("final ");
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if (isTransient(mod))
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r.append("transient ");
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if (isVolatile(mod))
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r.append("volatile ");
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if (isSynchronized(mod))
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r.append("synchronized ");
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if (isNative(mod))
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r.append("native ");
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if (isStrict(mod))
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r.append("strictfp ");
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if (isInterface(mod))
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r.append("interface ");
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// Trim trailing space.
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if ((mod & ALL_FLAGS) != 0)
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r.setLength(r.length() - 1);
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return r;
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}
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}
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