Initial revision

From-SVN: r26263

libjava/java/lang/Class.java

@@ -0,0 +1,155 @@
+// 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 ();
+}