Android Open Source - libgdx-chat-example Hash Map To Ordered Array

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License

The source code is released under:

Apache License

Java Source Code

package org.stofkat.chat.common.util;
/*w w  w . j a  v  a 2s.  c  om*/
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.stofkat.chat.common.ChatMessage;

/**
 * Quickly created this util class to fix the sorting. (the client was showing
 * messages in different orders.) You should write some unit tests to verify if
 * it works 100% if you're seriously going to use it.
 * 
 * @author Leejjon
 */
public class HashMapToOrderedArray {

  public static Object[] getOrderedObjectArray(Map<Integer, ChatMessage> chatMessages) {
    HashMap<Integer,ChatMessage> chatMessagesToCopy = new HashMap<Integer,ChatMessage>();
    chatMessagesToCopy.putAll(chatMessages);
    Object[] orderedArray = new Object[chatMessagesToCopy.size()];

    for (int i = 0; i < chatMessages.size(); i++) {
      Integer lowest = getLowestKey(chatMessagesToCopy.values());
      orderedArray[i] = chatMessagesToCopy.get(lowest);
      chatMessagesToCopy.remove(lowest);
    }

    return orderedArray;
  }

  public static Integer getLowestKey(Collection<ChatMessage> chatMessages) {
    Long lowestTimestamp = new Long(Long.MAX_VALUE);
    Integer lowestKey = Integer.MAX_VALUE;
    for (ChatMessage message : chatMessages) {
      if (message.getTimestamp() < lowestTimestamp) {
        lowestTimestamp = message.getTimestamp();
        lowestKey = new Integer(message.getId());
      }
    }

    return lowestKey;
  }
}

Java Source Code List

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