com.orientechnologies.orient.core.tx.OTransactionIndexChanges 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.
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package com.orientechnologies.orient.core.tx;

import java.util.Collection;
import java.util.NavigableMap;
import java.util.TreeMap;

import com.orientechnologies.common.comparator.ODefaultComparator;

/**
 * Collects the changes to an index for a certain key
 * 
 * @author Luca Garulli (l.garulli--at--orientechnologies.com)
 * 
 */
public class OTransactionIndexChanges {

  public static enum OPERATION {
    PUT, REMOVE, CLEAR
  }

  public NavigableMap changesPerKey  = new TreeMap(
                                                                                 ODefaultComparator.INSTANCE);

  public OTransactionIndexChangesPerKey                       nullKeyChanges = new OTransactionIndexChangesPerKey(null);

  public boolean                                              cleared        = false;

  public OTransactionIndexChangesPerKey getChangesPerKey(final Object key) {
    if (key == null)
      return nullKeyChanges;

    OTransactionIndexChangesPerKey changes = changesPerKey.get(key);
    if (changes == null) {
      changes = new OTransactionIndexChangesPerKey(key);
      changesPerKey.put(key, changes);
    }

    return changes;
  }

  public void setCleared() {
    changesPerKey.clear();
    nullKeyChanges.entries.clear();

    cleared = true;
  }

  public Object getFirstKey() {
    return changesPerKey.firstKey();
  }

  public Object getLastKey() {
    return changesPerKey.lastKey();
  }

  public Object getLowerKey(Object key) {
    return changesPerKey.lowerKey(key);
  }

  public Object getHigherKey(Object key) {
    return changesPerKey.higherKey(key);
  }

  public Object getCeilingKey(Object key) {
    return changesPerKey.ceilingKey(key);
  }

  public Object getFloorKey(Object key) {
    return changesPerKey.floorKey(key);
  }
}