/*
 * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *  
 */

package sun.jvm.hotspot.utilities.soql;

import sun.jvm.hotspot.oops.*;

/** This is JavaScript wrapper for Java Instance in debuggee.*/

public class JSJavaInstance extends JSJavaObject {
   public JSJavaInstance(Instance instance, JSJavaFactory fac) {
      super(instance, fac);
      this.type = (JSJavaInstanceKlass) fac.newJSJavaKlass(instance.getKlass());
   }

   public final Instance getInstance() {
       return (Instance) getOop();
   }

   public final JSJavaClass getJSJavaClass() {
       return type.getJSJavaClass();
   }

   public Object get(String name) {
      if (hasField(name)) {
	  return getFieldValue(name);	  
      } else {
	  return super.get(name);
      }
   }

   public Object[] getIds() {
      String[] fieldNames = getFieldNames();
      Object[] superFields = super.getIds();
      Object[] res = new Object[fieldNames.length + superFields.length];
      System.arraycopy(fieldNames, 0, res, 0, fieldNames.length);
      System.arraycopy(superFields, 0, res, fieldNames.length, superFields.length);
      return res;
   }

   public boolean has(String name) {
      if (hasField(name)) {
         return true;
      } else {
         return super.has(name);
      }
   }

   public void put(String name, Object value) {
      if (! hasField(name)) {
         super.put(name, value);
      }
   }

   protected Object getFieldValue(String name) {
      try {
         return type.getInstanceFieldValue(name, getInstance());
      } catch (NoSuchFieldException exp) {
         return UNDEFINED;
      }
   }

   protected String[] getFieldNames() {
      return type.getInstanceFieldNames();
   }

   protected boolean hasField(String name) {
      return type.hasInstanceField(name);
   }

   protected final JSJavaInstanceKlass type;
}
