mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-30 03:44:44 +08:00
286 lines
8.9 KiB
Java
286 lines
8.9 KiB
Java
/* java.lang.reflect.Modifier
|
|
Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
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.
|
|
|
|
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. */
|
|
|
|
|
|
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
|
|
* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
|
|
* Status: Believed complete and correct to version 1.2.
|
|
*/
|
|
|
|
/**
|
|
* 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
|
|
{
|
|
/** <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 ();
|
|
toString(mod, r);
|
|
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))
|
|
r.append("public ");
|
|
if (isProtected (mod))
|
|
r.append("protected ");
|
|
if (isPrivate (mod))
|
|
r.append("private ");
|
|
if (isAbstract (mod))
|
|
r.append("abstract ");
|
|
if (isStatic (mod))
|
|
r.append("static ");
|
|
if (isFinal (mod))
|
|
r.append("final ");
|
|
if (isTransient (mod))
|
|
r.append("transient ");
|
|
if (isVolatile (mod))
|
|
r.append("volatile ");
|
|
if (isNative (mod))
|
|
r.append("native ");
|
|
if (isSynchronized (mod))
|
|
r.append("synchronized ");
|
|
if (isInterface (mod))
|
|
r.append("interface ");
|
|
if (isStrict (mod))
|
|
r.append("strictfp ");
|
|
|
|
// Trim trailing space.
|
|
int l = r.length();
|
|
if (l > 0)
|
|
r.setLength(l - 1);
|
|
}
|
|
}
|