-// Modifier.java - Process modifier values.
+/* java.lang.reflect.Modifier
+ Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
-/* Copyright (C) 1998, 1999 Free Software Foundation
+This file is part of GNU Classpath.
- This file is part of libgcj.
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
-/**
- * @author Tom Tromey <tromey@cygnus.com>
- * @date October 1, 1998
- */
+
+package java.lang.reflect;
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
* "The Java Language Specification", ISBN 0-201-63451-1
* Status: Believed complete and correct to version 1.2.
*/
-package java.lang.reflect;
-
+/**
+ * Modifier is a helper class with static methods to determine whether an
+ * int returned from getModifiers() represents static, public, protected,
+ * native, final, etc... and provides an additional method to print
+ * out all of the modifiers in an int in order.
+ * <p>
+ * The methods in this class use the bitmask values in the VM spec to
+ * determine the modifiers of an int. This means that a VM must return a
+ * standard mask, conformant with the VM spec. I don't know if this is how
+ * Sun does it, but I'm willing to bet money that it is.
+ *
+ * @author John Keiser
+ * @author Tom Tromey <tromey@cygnus.com>
+ *
+ * @see Member#getModifiers()
+ * @see Method#getModifiers()
+ * @see Field#getModifiers()
+ * @see Constructor#getModifiers()
+ * @see Class#getModifiers()
+ */
public class Modifier
{
- public static final int PUBLIC = 0x001;
- public static final int PRIVATE = 0x002;
- public static final int PROTECTED = 0x004;
- public static final int STATIC = 0x008;
- public static final int FINAL = 0x010;
- public static final int SYNCHRONIZED = 0x020;
- public static final int VOLATILE = 0x040;
- public static final int TRANSIENT = 0x080;
- public static final int NATIVE = 0x100;
- public static final int INTERFACE = 0x200;
- public static final int ABSTRACT = 0x400;
- public static final int STRICT = 0x800;
-
- // This is only used by the C++ code, so it is not public.
+ /** <STRONG>This constructor really shouldn't be here ... there are no
+ * instance methods or variables of this class, so instantiation is
+ * worthless. However, this function is in the 1.1 spec, so it is added
+ * for completeness.</STRONG>
+ */
+ public Modifier() {}
+
+ /** Public: accessible from any other class. **/
+ public static final int PUBLIC = 0x0001;
+
+ /** Private: accessible only from the declaring class. **/
+ public static final int PRIVATE = 0x0002;
+
+ /** Protected: accessible only to subclasses. **/
+ public static final int PROTECTED = 0x0004;
+
+ /** Static: field or method - can be accessed or invoked without an
+ instance of the declaring class. **/
+ public static final int STATIC = 0x0008;
+
+ /** Final:<BR>
+ * <UL>
+ * <LI> Class: no subclasses allowed. </LI>
+ * <LI> Field: cannot be changed. </LI>
+ * <LI> Method: cannot be overriden. </LI>
+ * </UL>
+ */
+ public static final int FINAL = 0x0010;
+
+ /** Synchronized: lock the class while calling this method. **/
+ public static final int SYNCHRONIZED = 0x0020;
+
+ /** Volatile: cannot be cached.<P> **/
+ public static final int VOLATILE = 0x0040;
+
+ /** Transient: not serialized or deserialized. **/
+ public static final int TRANSIENT = 0x0080;
+
+ /** Native: use JNI to call this method. **/
+ public static final int NATIVE = 0x0100;
+
+ /** Interface: is an interface. **/
+ public static final int INTERFACE = 0x0200;
+
+ /** Abstract: class - may not be instantiated;
+ method - may not be called. **/
+ public static final int ABSTRACT = 0x0400;
+
+ /** Class or method - expressions are FP-strict. **/
+ public static final int STRICT = 0x0800;
+
+
+ /* NOTE: THIS IS HERE BECAUSE IT IS IN THE VM SPEC.
+ I INCLUDE IT FOR COMPLETENESS. IT ATTACHES TO A CLASS AND MEANS
+ "Treat superclasses specially in invokespecial". Note that it is the
+ same as synchronized. Reuse of the constant. *shudder* */
+ private static final int SUPER = 0x0020;
+
+ // This can only used by other code in this package, so it is not public.
static final int ALL_FLAGS = 0xfff;
+ /** Check whether the given modifier is abstract.
+ * @param mod the modifier.
+ * @return <code>true</code> if abstract, <code>false</code> otherwise.
+ */
public static boolean isAbstract (int mod)
{
return (mod & ABSTRACT) != 0;
}
+ /** Check whether the given modifier is final.
+ * @param mod the modifier.
+ * @return <code>true</code> if final, <code>false</code> otherwise.
+ */
public static boolean isFinal (int mod)
{
return (mod & FINAL) != 0;
}
+ /** Check whether the given modifier is an interface.
+ * @param mod the modifier.
+ * @return <code>true</code> if an interface, <code>false</code> otherwise.
+ */
public static boolean isInterface (int mod)
{
return (mod & INTERFACE) != 0;
}
+ /** Check whether the given modifier is native.
+ * @param mod the modifier.
+ * @return <code>true</code> if native, <code>false</code> otherwise.
+ */
public static boolean isNative (int mod)
{
return (mod & NATIVE) != 0;
}
+ /** Check whether the given modifier is private.
+ * @param mod the modifier.
+ * @return <code>true</code> if private, <code>false</code> otherwise.
+ */
public static boolean isPrivate (int mod)
{
return (mod & PRIVATE) != 0;
}
+ /** Check whether the given modifier is protected.
+ * @param mod the modifier.
+ * @return <code>true</code> if protected, <code>false</code> otherwise.
+ */
public static boolean isProtected (int mod)
{
return (mod & PROTECTED) != 0;
}
+ /** Check whether the given modifier is public.
+ * @param mod the modifier.
+ * @return <code>true</code> if public, <code>false</code> otherwise.
+ */
public static boolean isPublic (int mod)
{
return (mod & PUBLIC) != 0;
}
+ /** Check whether the given modifier is static.
+ * @param mod the modifier.
+ * @return <code>true</code> if static, <code>false</code> otherwise.
+ */
public static boolean isStatic (int mod)
{
return (mod & STATIC) != 0;
}
+ /** Check whether the given modifier is strictfp.
+ * @param mod the modifier.
+ * @return <code>true</code> if strictfp, <code>false</code> otherwise.
+ */
public static boolean isStrict (int mod)
{
return (mod & STRICT) != 0;
}
+ /** Check whether the given modifier is synchronized.
+ * @param mod the modifier.
+ * @return <code>true</code> if synchronized, <code>false</code> otherwise.
+ */
public static boolean isSynchronized (int mod)
{
return (mod & SYNCHRONIZED) != 0;
}
+ /** Check whether the given modifier is transient.
+ * @param mod the modifier.
+ * @return <code>true</code> if transient, <code>false</code> otherwise.
+ */
public static boolean isTransient (int mod)
{
return (mod & TRANSIENT) != 0;
}
+ /** Check whether the given modifier is volatile.
+ * @param mod the modifier.
+ * @return <code>true</code> if volatile, <code>false</code> otherwise.
+ */
public static boolean isVolatile (int mod)
{
return (mod & VOLATILE) != 0;
}
+ /** Get a string representation of all the modifiers represented by the
+ * given int.
+ * The keywords are printed in this order:
+ * <code><public|private|protected> abstract static final transient
+ * volatile native synchronized interface strictfp</code><P>
+ *
+ * <STRONG>This is, near as I can tell, the "canonical order" of modifiers
+ * mentioned by Sun in the reference implementation. I have inferred this
+ * from the order of printing in the Field, Method and Constructor
+ * classes.</STRONG>
+ *
+ * @param mod the modifier.
+ * @return the String representing the modifiers.
+ */
public static String toString (int mod)
{
StringBuffer r = new StringBuffer ();
return r.toString();
}
+ /**
+ * Package private helper toString() method that can take a StringBuffer.
+ * @param mod the modifier
+ * @param r the StringBuffer to which the String representation is appended
+ */
static void toString (int mod, StringBuffer r)
{
if (isPublic (mod))
if (isInterface (mod))
r.append("interface ");
if (isStrict (mod))
- r.append("strict ");
-
+ r.append("strictfp ");
+
// Trim trailing space.
int l = r.length();
if (l > 0)
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