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/*
 * 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 x7.core.util;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 
 * @author wyan
 * 
 */
public class MessageUtil {
	
	public static Date readDate(ByteBuffer buffer)  {
		long time = buffer.getLong();
		if (time == 0)
			return null;
		return new Date(time);
	}
	
	public static void writeDate(ByteBuffer buffer, Date date) {
		if (date == null){
			buffer.putLong(0L);
		}else{
			buffer.putLong(date.getTime());
		}
	}
	
	public static String readString(ByteBuffer buffer)  {
		short stringLength = 0;
		byte[] stringBytes;
		stringLength = buffer.getShort();
		stringBytes = new byte[stringLength];
		buffer.get(stringBytes);
		try {
			String str =  new String(stringBytes, "UTF-8");
			if (StringUtil.isNullOrEmpty(str))
				return null;
			return str;
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void writeString(ByteBuffer buffer, String content){
		if (content == null)
			content = "";
		byte[] bytes = null;
		try {
			bytes = content.getBytes("UTF-8");
			buffer.putShort((short) bytes.length);
			buffer.put(bytes);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	public static int getLength(String content)  {
		if (content == null)
			content = "";
		try {
			return 2 + content.getBytes("UTF-8").length;
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return 2;
	}
	
	public static Map readMap(ByteBuffer buffer) {
		Map map = new HashMap();
		short size = buffer.getShort();
		for (short i=0; i map) {
		if (map==null || map.isEmpty()){
			buffer.putShort((byte)0);
			return;
		}
		short size = (short) map.size();
		buffer.putShort(size);
		for (Integer key : map.keySet()){
			buffer.putInt(key);
			buffer.putInt(map.get(key));
		}
	}
	
	public static int getLength(Map map){
		int size = 0;
		if (map!=null ){
			size = map.size() * 8;
		}
		return 2 + size;
	}

}