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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.cache.persistence;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.net.InetAddress;
import java.util.UUID;

import com.gemstone.gemfire.DataSerializable;
import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.internal.cache.versions.VersionSource;

/**
 * @author dsmith
 *
 */
public class PersistentMemberID implements DataSerializable {
  private static final long serialVersionUID = 7037022320499508045L;
  
  public InetAddress host;
  public String directory;
  public long timeStamp;
  public short version;
  public DiskStoreID diskStoreId;
  public String name;
  
  public PersistentMemberID() {
    
  }

  public PersistentMemberID(DiskStoreID diskStoreId, InetAddress host, String directory, String name, long timeStamp, short version) {
    this.diskStoreId = diskStoreId;
    this.host = host;
    this.directory = directory;
    this.name = name;
    this.timeStamp = timeStamp;
    this.version = version;
  }

  public PersistentMemberID(DiskStoreID diskStoreId, InetAddress host, String directory, long timeStamp, short version) {
    this.diskStoreId = diskStoreId;
    this.host = host;
    this.directory = directory;
    this.timeStamp = timeStamp;
    this.version = version;
  }
  
  /**
   * Indicate that this persistent member id is from the same disk store,
   * and is older than, or equal to, the passed in disk store.
   * 
   * This is an older version if it has an older timestamp, or the
   * same timestamp and an older version
   */
  public boolean isOlderOrEqualVersionOf(PersistentMemberID id) {
    return (id != null)
        && (diskStoreId.equals(id.diskStoreId)) 
       && (timeStamp <= id.timeStamp 
       && (timeStamp < id.timeStamp || version <= id.version));
  }

  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    long diskStoreIdHigh =  in.readLong();
    long diskStoreIdLow =  in.readLong();
    this.diskStoreId = new DiskStoreID(diskStoreIdHigh, diskStoreIdLow);
    this.host = DataSerializer.readInetAddress(in);
    this.directory = DataSerializer.readString(in);
    this.timeStamp = in.readLong();
    this.version = in.readShort();
    this.name = DataSerializer.readString(in);
  }

  public void fromData662(DataInput in) throws IOException, ClassNotFoundException {
    long diskStoreIdHigh =  in.readLong();
    long diskStoreIdLow =  in.readLong();
    this.diskStoreId = new DiskStoreID(diskStoreIdHigh, diskStoreIdLow);
    this.host = DataSerializer.readInetAddress(in);
    this.directory = DataSerializer.readString(in);
    this.timeStamp = in.readLong();
    this.version = in.readShort();
  }

  public void toData(DataOutput out) throws IOException {
    out.writeLong(this.diskStoreId.getMostSignificantBits());
    out.writeLong(this.diskStoreId.getLeastSignificantBits());
    DataSerializer.writeInetAddress(host, out);
    DataSerializer.writeString(directory, out);
    out.writeLong(timeStamp);
    out.writeShort(version);
    DataSerializer.writeString(this.name, out);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((diskStoreId == null) ? 0 : diskStoreId.hashCode());
    result = prime * result + ((directory == null) ? 0 : directory.hashCode());
    result = prime * result + ((name == null) ? 0 : name.hashCode());
    result = prime * result + ((host == null) ? 0 : host.hashCode());
    result = prime * result + (int) (timeStamp ^ (timeStamp >>> 32));
    result = prime * result + version;
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    PersistentMemberID other = (PersistentMemberID) obj;
    if (directory == null) {
      if (other.directory != null)
        return false;
    } else if (!directory.equals(other.directory))
      return false;
    if (diskStoreId == null) {
      if (other.diskStoreId != null)
        return false;
    } else if (!diskStoreId.equals(other.diskStoreId))
      return false;
    if (host == null) {
      if (other.host != null)
        return false;
    } else if (!host.equals(other.host))
      return false;
    if (timeStamp != other.timeStamp)
      return false;
    if (version != other.version)
      return false;
    if (name == null) {
      if (other.name != null)
        return false;
    } else if (!name.equals(other.name))
      return false;

    return true;
  }

  @Override
  public String toString() {
    return host + ":" + directory + " created at timestamp " + timeStamp + " version " + version +" diskStoreId " + diskStoreId + " name " + name;
  }
  
  public String abbrev() {
    return diskStoreId.abbrev();
  }

  public VersionSource getVersionMember() {
    return this.diskStoreId;
  }
}