/*

 * 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.

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 */

package sun.jvm.hotspot.memory;

import java.io.*;

import java.util.*;

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 StringTable extends sun.jvm.hotspot.utilities.Hashtable {

  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("StringTable");

    theTableField  = type.getAddressField("_the_table");

  }

  // Fields

  private static AddressField theTableField;

  // Accessors

  public static StringTable getTheTable() {

    Address tmp = theTableField.getValue();

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

  }

  public StringTable(Address addr) {

    super(addr);

  }

  public interface StringVisitor {

    public void visit(Instance string);

  }

  public void stringsDo(StringVisitor visitor) {

    ObjectHeap oh = VM.getVM().getObjectHeap();

    int numBuckets = tableSize();

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

      for (HashtableEntry e = (HashtableEntry) bucket(i); e != null;

           e = (HashtableEntry) e.next()) {

        Instance s = (Instance)oh.newOop(e.literalValue().addOffsetToAsOopHandle(0));

        visitor.visit(s);

      }

    }

  }

}