/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2006-2008 Sun Microsystems, Inc.
 *      Portions Copyright 2011-2015 ForgeRock AS
 */
package org.opends.server.backends.pluggable;

import org.forgerock.opendj.ldap.ByteString;
import org.opends.server.backends.pluggable.spi.ReadableTransaction;
import org.opends.server.backends.pluggable.spi.StorageRuntimeException;
import org.opends.server.backends.pluggable.spi.TreeName;
import org.opends.server.backends.pluggable.spi.WriteableTransaction;

/**
 * This class is a wrapper around the tree object and provides basic
 * read and write methods for entries.
 */
abstract class AbstractTree implements Tree
{
  /** The name of the tree within the entryContainer. */
  private final TreeName name;

  AbstractTree(final TreeName name)
  {
    this.name = name;
  }

  @Override
  public final void open(WriteableTransaction txn, boolean createOnDemand) throws StorageRuntimeException
  {
    txn.openTree(name, createOnDemand);
    afterOpen(txn, createOnDemand);
  }

  /** Override in order to perform any additional initialization after the index has opened. */
  void afterOpen(WriteableTransaction txn, boolean createOnDemand) throws StorageRuntimeException
  {
    // Do nothing by default.
  }

  @Override
  public final void delete(WriteableTransaction txn) throws StorageRuntimeException
  {
    beforeDelete(txn);
    txn.deleteTree(name);
  }

  /** Override in order to perform any additional operation before index tree deletion. */
  void beforeDelete(WriteableTransaction txn) throws StorageRuntimeException
  {
    // Do nothing by default.
  }

  @Override
  public final long getRecordCount(ReadableTransaction txn) throws StorageRuntimeException
  {
    return txn.getRecordCount(name);
  }

  @Override
  public final TreeName getName()
  {
    return name;
  }

  @Override
  public final String toString()
  {
    return name.toString();
  }

  @Override
  public int compareTo(Tree o)
  {
    return name.compareTo(o.getName());
  }

  @Override
  public String keyToString(ByteString key)
  {
    return key.toString();
  }

  @Override
  public String valueToString(ByteString value)
  {
    return value.toString();
  }

  @Override
  public ByteString generateKey(String key)
  {
    return ByteString.valueOfUtf8(key);
  }
}