cc.tochat.webserver.model.message.AbstractMessage.java Source code

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Here is the source code for cc.tochat.webserver.model.message.AbstractMessage.java

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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.
 *
* @Title: AbstractMessage.java 
* @Package cc.tochat.webserver.model 
* @Description: TODO
* @author dailey.yet@outlook.com  
* @date Apr 25, 2016
* @version V1.0   
*/
package cc.tochat.webserver.model.message;

import cc.tochat.webserver.helper.json.AnnotationExclusionStrategy;
import cc.tochat.webserver.helper.json.Exclude;
import cc.tochat.webserver.model.IConstant;
import cc.tochat.webserver.model.IDecoder;
import cc.tochat.webserver.model.IEncoder;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.annotations.SerializedName;

/**
 * @author dailey.yet@outlook.com
 *
 */
public abstract class AbstractMessage implements IMessage, IEncoder, IDecoder<AbstractMessage> {

    @SerializedName(IConstant.MSG_TIMESTAMP)
    private String timestamp;
    @SerializedName(IConstant.MSG_CONTENT)
    private Object content;
    @SerializedName(IConstant.MSG_TYPE)
    private String type = getType();
    @SerializedName(IConstant.MSG_TOKEN)
    @Exclude
    private String token;
    @Exclude
    protected transient Gson gson;

    public AbstractMessage() {
        this.gson = new GsonBuilder().setExclusionStrategies(new AnnotationExclusionStrategy()).create();
    }

    public String getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(String timestamp) {
        this.timestamp = timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = String.valueOf(timestamp);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T extends Object> T getContent() {
        return (T) content;
    }

    public <T extends Object> void setContent(T content) {
        this.content = content;
    }

    @Override
    public String encode() {
        return gson.toJson(this);
    }

    @Override
    public AbstractMessage decode(String target) {
        return gson.fromJson(target, this.getClass());
    }

    public String getToken() {
        return token;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public final static AbstractMessage EMPTY = new NullMessage();

    static class NullMessage extends AbstractMessage {
        @Override
        public String getType() {
            return "EMPTY";
        }
    }
}