com.orientechnologies.orient.core.index.hashindex.local.ONullBucket Maven / Gradle / Ivy

/*
 *
 *  *  Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
 *  *
 *  *  Licensed under the Apache License, Version 2.0 (the "License");
 *  *  you may not use this file except in compliance with the License.
 *  *  You may obtain a copy of the License at
 *  *
 *  *       http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *  Unless required by applicable law or agreed to in writing, software
 *  *  distributed under the License is distributed on an "AS IS" BASIS,
 *  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *  See the License for the specific language governing permissions and
 *  *  limitations under the License.
 *  *
 *  * For more information: http://www.orientechnologies.com
 *
 */

package com.orientechnologies.orient.core.index.hashindex.local;

import com.orientechnologies.common.directmemory.ODirectMemoryPointer;
import com.orientechnologies.common.serialization.types.OBinarySerializer;
import com.orientechnologies.orient.core.cache.OCache;
import com.orientechnologies.orient.core.index.hashindex.local.cache.OCacheEntry;
import com.orientechnologies.orient.core.storage.impl.local.paginated.base.ODurablePage;
import com.orientechnologies.orient.core.storage.impl.local.paginated.wal.OWALChangesTree;

import java.io.IOException;

/**
 * @author Andrey Lomakin (a.lomakin-at-orientechnologies.com)
 * @since 4/25/14
 */
public class ONullBucket extends ODurablePage {
  private final OBinarySerializer valueSerializer;

  public ONullBucket(OCacheEntry cacheEntry, OWALChangesTree changesTree, OBinarySerializer valueSerializer, boolean isNew) {
    super(cacheEntry, changesTree);
    this.valueSerializer = valueSerializer;

    if (isNew)
      setByteValue(NEXT_FREE_POSITION, (byte) 0);
  }

  public void setValue(V value) throws IOException {
    setByteValue(NEXT_FREE_POSITION, (byte) 1);

    final int valueSize = valueSerializer.getObjectSize(value);

    final byte[] serializedValue = new byte[valueSize];
    valueSerializer.serializeNativeObject(value, serializedValue, 0);

    setBinaryValue(NEXT_FREE_POSITION + 1, serializedValue);
  }

  public V getValue() {
    if (getByteValue(NEXT_FREE_POSITION) == 0)
      return null;

    return deserializeFromDirectMemory(valueSerializer, NEXT_FREE_POSITION + 1);
  }

  public void removeValue() {
    setByteValue(NEXT_FREE_POSITION, (byte) 0);
  }
}