dk.au.cs.karibu.deserializer.EXMRE001.java Source code

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Here is the source code for dk.au.cs.karibu.deserializer.EXMRE001.java

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/*
 * Copyright 2013 Henrik Baerbak Christensen, Aarhus University
 *
 * 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.
 */

package dk.au.cs.karibu.deserializer;

import java.util.Date;

import com.mongodb.BasicDBObject;

import org.codehaus.jackson.map.util.ISO8601Utils;

import dk.au.cs.karibu.serialization.Deserializer;

/** An example deserializer for JSON payloads. 
 * You can write these rather generic using methods
 * from the mongo and jackson libraries.
 * 
 * To allow Mongo to index timestamps properly,
 * convert it from a string to a real Mongo Data object.
 * 
 * @author Henrik Baerbak Christensen, Aarhus University
 *
 */

public class EXMRE001 implements Deserializer {

    @Override
    public BasicDBObject buildDocumentFromByteArray(byte[] payload) {
        Date theTimestamp;

        // The binary payload is actually a string in JSON format 
        String asJSON = new String(payload);

        // and Mongo has utils to convert that :) 
        BasicDBObject dbo = (BasicDBObject) com.mongodb.util.JSON.parse(asJSON);

        // Read out the timestamp as string and write it back as Date object 
        String asISODate = dbo.getString("timestamp");
        theTimestamp = ISO8601Utils.parse(asISODate);
        dbo.put("timestamp", theTimestamp);

        return dbo;
    }

}