/*

 * 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.classfile;

import java.io.PrintStream;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.memory.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.types.*;

public class ClassLoaderData extends VMObject {

  static {

    VM.registerVMInitializedObserver(new java.util.Observer() {

        public void update(java.util.Observable o, Object data) {

          initialize(VM.getVM().getTypeDataBase());

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {

    Type type      = db.lookupType("ClassLoaderData");

    nextField = type.getAddressField("_next");

    klassesField = new MetadataField(type.getAddressField("_klasses"), 0);

    isAnonymousField = new CIntField(type.getCIntegerField("_is_anonymous"), 0);

    dictionaryField = type.getAddressField("_dictionary");

  }

  private static AddressField nextField;

  private static MetadataField  klassesField;

  private static CIntField isAnonymousField;

  private static AddressField dictionaryField;

  public ClassLoaderData(Address addr) {

    super(addr);

  }

  public Dictionary dictionary() {

      Address tmp = dictionaryField.getValue();

      return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp);

  }

  public static ClassLoaderData instantiateWrapperFor(Address addr) {

    if (addr == null) {

      return null;

    }

    return new ClassLoaderData(addr);

  }

  public Oop getClassLoader() {

  }

  public boolean getIsAnonymous() {

    return isAnonymousField.getValue(this) != 0;

  }

  public ClassLoaderData next() {

    return instantiateWrapperFor(nextField.getValue(getAddress()));

  }

  public Klass getKlasses()    { return (Klass)klassesField.getValue(this);  }

  /** Lookup an already loaded class. If not found null is returned. */

  public Klass find(Symbol className) {

    for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) {

        if (className.equals(l.getName())) {

            return l;

        }

    }

    return null;

  }

  /** Iterate over all klasses - including object, primitive

      array klasses */

  public void classesDo(ClassLoaderDataGraph.ClassVisitor v) {

      for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) {

          v.visit(l);

      }

  }

  /** Iterate over all klasses in the dictionary, including initiating loader. */

  public void allEntriesDo(ClassLoaderDataGraph.ClassAndLoaderVisitor v) {

      for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) {

          dictionary().allEntriesDo(v, getClassLoader());

      }

  }

}