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Axolotl library for Java

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package org.whispersystems.libaxolotl.state.impl;

import org.whispersystems.libaxolotl.AxolotlAddress;
import org.whispersystems.libaxolotl.state.SessionRecord;
import org.whispersystems.libaxolotl.state.SessionStore;

import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class InMemorySessionStore implements SessionStore {

  private Map sessions = new HashMap<>();

  public InMemorySessionStore() {}

  @Override
  public synchronized SessionRecord loadSession(AxolotlAddress remoteAddress) {
    try {
      if (containsSession(remoteAddress)) {
        return new SessionRecord(sessions.get(remoteAddress));
      } else {
        return new SessionRecord();
      }
    } catch (IOException e) {
      throw new AssertionError(e);
    }
  }

  @Override
  public synchronized List getSubDeviceSessions(String name) {
    List deviceIds = new LinkedList<>();

    for (AxolotlAddress key : sessions.keySet()) {
      if (key.getName().equals(name) &&
          key.getDeviceId() != 1)
      {
        deviceIds.add(key.getDeviceId());
      }
    }

    return deviceIds;
  }

  @Override
  public synchronized void storeSession(AxolotlAddress address, SessionRecord record) {
    sessions.put(address, record.serialize());
  }

  @Override
  public synchronized boolean containsSession(AxolotlAddress address) {
    return sessions.containsKey(address);
  }

  @Override
  public synchronized void deleteSession(AxolotlAddress address) {
    sessions.remove(address);
  }

  @Override
  public synchronized void deleteAllSessions(String name) {
    for (AxolotlAddress key : sessions.keySet()) {
      if (key.getName().equals(name)) {
        sessions.remove(key);
      }
    }
  }
}