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// Class.java - Representation of a Java class.
/* Copyright (C) 1998, 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.lang;
import java.io.Serializable;
import java.io.InputStream;
import java.lang.reflect.*;
/**
* @author Tom Tromey <tromey@cygnus.com>
* @date October 1, 1998
*/
/* 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.
* plus gcj compiler sources (to determine object layout)
* Status: Sufficient for our purposes, but some methods missing
* and some not implemented.
*/
public final class Class implements Serializable
{
public static native Class forName (String className)
throws ClassNotFoundException;
public native Class[] getClasses ();
public native ClassLoader getClassLoader ();
public native Class getComponentType ();
public native Constructor getConstructor (Class[] parameterTypes)
throws NoSuchMethodException, SecurityException;
public native Constructor[] getConstructors () throws SecurityException;
public native Class[] getDeclaredClasses () throws SecurityException;
public native Constructor getDeclaredConstructor (Class[] parameterTypes)
throws NoSuchMethodException, SecurityException;
public native Constructor[] getDeclaredConstructors ()
throws SecurityException;
public native Field getDeclaredField (String fieldName)
throws NoSuchFieldException, SecurityException;
public native Field[] getDeclaredFields () throws SecurityException;
public native Method getDeclaredMethod (String methodName,
Class[] parameterTypes)
throws NoSuchMethodException, SecurityException;
public native Method[] getDeclaredMethods () throws SecurityException;
// This is marked as unimplemented in the JCL book.
public native Class getDeclaringClass ();
private native Field getField (String fieldName, int hash)
throws NoSuchFieldException, SecurityException;
public Field getField (String fieldName)
throws NoSuchFieldException, SecurityException
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkMemberAccess (this, java.lang.reflect.Member.DECLARED);
Field fld = getField(fieldName, fieldName.hashCode());
if (fld == null)
throw new NoSuchFieldException(fieldName);
return fld;
}
public native Field[] getFields () throws SecurityException;
public native Class[] getInterfaces ();
public native Method getMethod (String methodName, Class[] parameterTypes)
throws NoSuchMethodException, SecurityException;
public native Method[] getMethods () throws SecurityException;
public native int getModifiers ();
public native String getName ();
// FIXME: can't implement this until we have java.net.
// public URL getResource (String resourceName);
// FIXME: implement.
public InputStream getResourceAsStream (String resourceName)
{
return null;
}
// FIXME: implement. Requires java.security.
public Object[] getSigners ()
{
return null;
}
public native Class getSuperclass ();
public native boolean isArray ();
public native boolean isAssignableFrom (Class cls);
public native boolean isInstance (Object obj);
public native boolean isInterface ();
public native boolean isPrimitive ();
public native Object newInstance ()
throws InstantiationException, IllegalAccessException;
public String toString ()
{
if (isPrimitive ())
return getName ();
return (isInterface () ? "interface " : "class ") + getName ();
}
// Don't allow new classes to be made.
private Class ()
{
}
// Do a security check.
private void checkMemberAccess (int flags)
{
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkMemberAccess(this, flags);
}
// FIXME: this method exists only because we cannot catch Java
// exceptions from C++ code. This is a helper for initializeClass.
private Throwable hackTrampoline (int what, Throwable old_exception)
{
Throwable new_val = null;
try
{
if (what == 0)
initializeClass ();
else if (what == 1)
hackRunInitializers ();
else if (what == 2)
new_val = new ExceptionInInitializerError (old_exception);
}
catch (Throwable t)
{
new_val = t;
}
return new_val;
}
// FIXME: this is a hack to let us run the class initializers. We
// could do it inline in initializeClass() if we could catch Java
// exceptions from C++.
private native void hackRunInitializers ();
// Initialize the class.
private native void initializeClass ();
}
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