/*

 * Copyright 2000-2005 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.oops;

import java.io.*;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.types.*;

import sun.jvm.hotspot.utilities.*;

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

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

        }

      });

  }

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

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

    constants      = new OopField(type.getOopField("_constant_pool"), 0);

    baseOffset     = type.getSize();

    Type elType    = db.lookupType("ConstantPoolCacheEntry");

    elementSize    = elType.getSize();

  }

  ConstantPoolCache(OopHandle handle, ObjectHeap heap) {

    super(handle, heap);

  }

  public boolean isConstantPoolCache() { return true; }

  private static OopField constants;

  private static long baseOffset;

  private static long elementSize;

  public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); }

  public long getObjectSize() {

    return alignObjectSize(baseOffset + getLength() * elementSize);

  }

  public ConstantPoolCacheEntry getEntryAt(int i) {

    if (Assert.ASSERTS_ENABLED) {

      Assert.that(0 <= i && i < getLength(), "index out of bounds");

    }

    return new ConstantPoolCacheEntry(this, i);

  }

  public int getIntAt(int entry, int fld) {

    //alignObjectSize ?

    long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize();

    return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true );

  }

  public void printValueOn(PrintStream tty) {

    tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString());

  }

  public void iterateFields(OopVisitor visitor, boolean doVMFields) {

    super.iterateFields(visitor, doVMFields);

    if (doVMFields) {

      visitor.doOop(constants, true);

      for (int i = 0; i < getLength(); i++) {

        ConstantPoolCacheEntry entry = getEntryAt(i);

        entry.iterateFields(visitor);

      }

    }

  }

};