/**
 * 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 backtype.storm.serialization;

import backtype.storm.tuple.Values;
import backtype.storm.utils.ListDelegate;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Output;
import java.io.IOException;
import java.util.List;
import java.util.Map;

public class KryoValuesSerializer {
    Kryo _kryo;
    ListDelegate _delegate;
    Output _kryoOut;

    public KryoValuesSerializer(Map conf) {
        _kryo = SerializationFactory.getKryo(conf);
        _delegate = new ListDelegate();
        _kryoOut = new Output(2000, 2000000000);
    }

    public void serializeInto(List<Object> values, Output out) throws IOException {
    	if (values instanceof Values) {
    		Values val = (Values) values;
            out.writeInt(val.type, true);
    	    switch (val.type) {
    	        case Values.OBJECT:
    	        	serialize(values, out);
    	        	break;
    	        case Values.STRING:
    	        	serializeStrings(values, out);
    	        	break;
    	        case Values.INTEGER:
    	        	serializeIntegers(values, out);
    	        	break;
    	    }
    	} else {
    		out.writeInt(Values.OBJECT, true);
    		serialize(values, out);
    	}
    }

    public void serialize(List<Object> values, Output out) throws IOException {
        // this ensures that list of values is always written the same way, regardless
        // of whether it's a java collection or one of clojure's persistent collections
        // (which have different serializers)
        // Doing this lets us deserialize as ArrayList and avoid writing the class here
        _delegate.setDelegate(values);
        _kryo.writeObject(out, _delegate);
    }

    public byte[] serialize(List<Object> values) throws IOException {
        _kryoOut.clear();
        serializeInto(values, _kryoOut);
        return _kryoOut.toBytes();
    }

    public byte[] serializeObject(Object obj) {
        _kryoOut.clear();
        _kryo.writeClassAndObject(_kryoOut, obj);
        return _kryoOut.toBytes();
    }

    private void serializeStrings(List<Object> values, Output out) {
    	out.writeInt(values.size(), true);
    	for (Object o : values) {
    		String str = (String) o;
    		out.writeString(str);
    	}
    }

    private void serializeIntegers(List<Object> values, Output out) {
    	out.writeInt(values.size(), true);
    	for (Object o : values) {
    		Integer i = (Integer) o;
    		out.writeInt(i, true);
    	}
    }
}