geode-core/src/main/java/org/apache/geode/internal/cache/region/entry/RegionEntryFactoryBuilder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.
 */
package org.apache.geode.internal.cache.region.entry;

import org.apache.geode.internal.cache.RegionEntryFactory;
import org.apache.geode.internal.cache.entries.VMStatsDiskLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMStatsDiskLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMStatsDiskRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMStatsDiskRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMStatsLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMStatsLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMStatsRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMStatsRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMThinDiskLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMThinDiskLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMThinDiskRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMThinDiskRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMThinLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMThinLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VMThinRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VMThinRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsDiskLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsDiskLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsDiskRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsDiskRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedStatsRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedThinDiskLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedThinDiskLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedThinDiskRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedThinDiskRegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedThinLRURegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedThinLRURegionEntryOffHeap;
import org.apache.geode.internal.cache.entries.VersionedThinRegionEntryHeap;
import org.apache.geode.internal.cache.entries.VersionedThinRegionEntryOffHeap;

public class RegionEntryFactoryBuilder {
  public RegionEntryFactory create(boolean statsEnabled, boolean isLRU, boolean isDisk,
      boolean withVersioning, boolean offHeap) {
    int bitRepresentation = 0;
    bitRepresentation |= statsEnabled ? 1 : 0;
    bitRepresentation |= isLRU ? 2 : 0;
    bitRepresentation |= isDisk ? 4 : 0;
    bitRepresentation |= withVersioning ? 8 : 0;
    bitRepresentation |= offHeap ? 16 : 0;

    /*
     * The bits represent all options |offHeap|versioning|disk|lru|stats|
     */
    switch (bitRepresentation) {
      case (0):
        return VMThinRegionEntryHeap.getEntryFactory(); // Bits: 00000
      case (1):
        return VMStatsRegionEntryHeap.getEntryFactory(); // Bits: 00001
      case (2):
        return VMThinLRURegionEntryHeap.getEntryFactory(); // Bits: 00010
      case (3):
        return VMStatsLRURegionEntryHeap.getEntryFactory(); // Bits: 00011
      case (4):
        return VMThinDiskRegionEntryHeap.getEntryFactory(); // Bits: 00100
      case (5):
        return VMStatsDiskRegionEntryHeap.getEntryFactory(); // Bits: 00101
      case (6):
        return VMThinDiskLRURegionEntryHeap.getEntryFactory(); // Bits: 00110
      case (7):
        return VMStatsDiskLRURegionEntryHeap.getEntryFactory(); // Bits: 00111
      case (8):
        return VersionedThinRegionEntryHeap.getEntryFactory(); // Bits: 01000
      case (9):
        return VersionedStatsRegionEntryHeap.getEntryFactory(); // Bits: 01001
      case (10):
        return VersionedThinLRURegionEntryHeap.getEntryFactory(); // Bits: 01010
      case (11):
        return VersionedStatsLRURegionEntryHeap.getEntryFactory(); // Bits: 01011
      case (12):
        return VersionedThinDiskRegionEntryHeap.getEntryFactory(); // Bits: 01100
      case (13):
        return VersionedStatsDiskRegionEntryHeap.getEntryFactory(); // Bits: 01101
      case (14):
        return VersionedThinDiskLRURegionEntryHeap.getEntryFactory(); // Bits: 01110
      case (15):
        return VersionedStatsDiskLRURegionEntryHeap.getEntryFactory(); // Bits: 01111
      case (16):
        return VMThinRegionEntryOffHeap.getEntryFactory(); // Bits: 10000
      case (17):
        return VMStatsRegionEntryOffHeap.getEntryFactory(); // Bits: 10001
      case (18):
        return VMThinLRURegionEntryOffHeap.getEntryFactory(); // Bits: 10010
      case (19):
        return VMStatsLRURegionEntryOffHeap.getEntryFactory(); // Bits: 10011
      case (20):
        return VMThinDiskRegionEntryOffHeap.getEntryFactory(); // Bits: 10100
      case (21):
        return VMStatsDiskRegionEntryOffHeap.getEntryFactory(); // Bits: 10101
      case (22):
        return VMThinDiskLRURegionEntryOffHeap.getEntryFactory(); // Bits: 10110
      case (23):
        return VMStatsDiskLRURegionEntryOffHeap.getEntryFactory(); // Bits: 10111
      case (24):
        return VersionedThinRegionEntryOffHeap.getEntryFactory(); // Bits: 11000
      case (25):
        return VersionedStatsRegionEntryOffHeap.getEntryFactory(); // Bits: 11001
      case (26):
        return VersionedThinLRURegionEntryOffHeap.getEntryFactory(); // Bits: 11010
      case (27):
        return VersionedStatsLRURegionEntryOffHeap.getEntryFactory(); // Bits: 11011
      case (28):
        return VersionedThinDiskRegionEntryOffHeap.getEntryFactory(); // Bits: 11100
      case (29):
        return VersionedStatsDiskRegionEntryOffHeap.getEntryFactory(); // Bits: 11101
      case (30):
        return VersionedThinDiskLRURegionEntryOffHeap.getEntryFactory(); // Bits: 11110
      case (31):
        return VersionedStatsDiskLRURegionEntryOffHeap.getEntryFactory(); // Bits: 11111
      default:
        throw new IllegalStateException("unexpected bitRepresentation " + bitRepresentation);
    }
  }
}