text: /*
   * Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   *
   */
  
  package sun.jvm.hotspot.runtime;
  
  import java.util.*;
  import sun.jvm.hotspot.debugger.*;
  import sun.jvm.hotspot.debugger.cdbg.CDebugger;
  import sun.jvm.hotspot.debugger.cdbg.ClosestSymbol;
  import sun.jvm.hotspot.debugger.cdbg.LoadObject;
  import sun.jvm.hotspot.types.*;
  import sun.jvm.hotspot.HotSpotTypeDataBase;
  
  /** This provides a factory to create instances where the base virtual
   * type is know and the expected subclasses are within a particular
   * package. */
  
  public class VirtualBaseConstructor<T> extends InstanceConstructor {
    private TypeDataBase db;
    private HashMap      map; // Map<String, Class>
    private Type         baseType;
    private Class        unknownTypeHandler;
  
    public VirtualBaseConstructor(TypeDataBase db, Type baseType, String packageName, Class unknownTypeHandler) {
      this.db = (HotSpotTypeDataBase)db;
      map     = new HashMap();
      this.baseType = baseType;
      this.unknownTypeHandler = unknownTypeHandler;
      // Try to find mirror types for each of the types.  If there isn't
      // a direct mirror then try to find an instantiable superclass and
      // treat it as that.
      for (Iterator iter = db.getTypes(); iter.hasNext(); ) {
        Type t = (Type) iter.next();
        Type superType = t;
        while (superType != null && superType != baseType) {
          superType = superType.getSuperclass();
        }
        if (superType == baseType) {
          superType = t;
          Class c = null;
          while (c == null && superType != null) {
            try {
              c = Class.forName(packageName + "." + superType.getName());
            } catch (Exception e) {
            }
            if (c == null) superType = superType.getSuperclass();
          }
          if (c == null) {
            c = unknownTypeHandler;
          }
          map.put(t.getName(), c);
        }
      }
    }
  
    /** Instantiate the most-precisely typed wrapper object available
        for the type of the given Address. If no type in the mapping
        matched the type of the Address, throws a WrongTypeException.
        Returns null for a null address (similar behavior to
        VMObjectFactory). */
    public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException {
      if (addr == null) {
        return null;
      }
  
      Type type = db.findDynamicTypeForAddress(addr, baseType);
      if (type != null) {
          return (VMObject) VMObjectFactory.newObject((Class) map.get(type.getName()), addr);
      } else if (unknownTypeHandler != null) {
          return (VMObject) VMObjectFactory.newObject(unknownTypeHandler, addr);
      }
  
      throw newWrongTypeException(addr);
    }
  }
  