/*

 * 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.memory;

import java.util.*;

import sun.jvm.hotspot.classfile.ClassLoaderData;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.types.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.utilities.*;

public class DictionaryEntry extends sun.jvm.hotspot.utilities.HashtableEntry {

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

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

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) {

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

    pdSetField = type.getAddressField("_pd_set");

    loaderDataField = type.getAddressField("_loader_data");

  }

  // Fields

  private static AddressField pdSetField;

  private static AddressField loaderDataField;

  // Accessors

  public ProtectionDomainEntry pdSet() {

    Address tmp = pdSetField.getValue(addr);

    return (ProtectionDomainEntry) VMObjectFactory.newObject(

                          ProtectionDomainEntry.class, tmp);

  }

  public Oop loader() {

    return loaderData().getClassLoader();

  }

  public ClassLoaderData loaderData() {

    return ClassLoaderData.instantiateWrapperFor(loaderDataField.getValue(addr));

  }

  public Klass klass() {

    return (Klass)Metadata.instantiateWrapperFor(literalValue());

  }

  public DictionaryEntry(Address addr) {

    super(addr);

  }

  public boolean equals(Symbol className, Oop classLoader) {

    InstanceKlass ik = (InstanceKlass) klass();

    Oop loader = loader();

    if (! ik.getName().equals(className)) {

      return false;

    } else {

      return (loader == null)? (classLoader == null) :

                               (loader.equals(classLoader));

    }

  }

  public boolean isValidProtectionDomain(Oop protectionDomain) {

    if (protectionDomain == null) {

      return true;

    } else {

      return containsProtectionDomain(protectionDomain);

    }

  }

  public boolean containsProtectionDomain(Oop protectionDomain) {

    InstanceKlass ik = (InstanceKlass) klass();

    // Currently unimplemented and not used.

    // if (protectionDomain.equals(ik.getJavaMirror().getProtectionDomain())) {

    //   return true; // Succeeds trivially

    // }

    for (ProtectionDomainEntry current = pdSet(); current != null;

                                       current = current.next()) {

      if (protectionDomain.equals(current.protectionDomain())) {

        return true;

      }

    }

    return false;

  }

  /* covariant return type :-(

  public DictionaryEntry next() {

    return (DictionaryEntry) super.next();

  }

  For now, let the caller cast it ..

  */

}