com.epam.deltix.qsrv.hf.pub.serializers.ObjectDeserializer Maven / Gradle / Ivy
/*
* Copyright 2021 EPAM Systems, Inc
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. 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 com.epam.deltix.qsrv.hf.pub.serializers;
import com.epam.deltix.qsrv.hf.pub.codec.BoundDecoder;
import com.epam.deltix.qsrv.hf.pub.codec.TimeCodec;
import com.epam.deltix.qsrv.hf.pub.md.BooleanDataType;
import com.epam.deltix.timebase.messages.InstrumentMessage;
import com.epam.deltix.util.memory.MemoryDataInput;
/**
* Implements deserialization of objects using Timebase codecs.
*
*
* The class implements deserialization for schema with single object. It can deserialize only object
* of one type and does not red information about type of the deserialized object.
*
*/
class ObjectDeserializer implements Deserializer {
private final BoundDecoder _decoder;
private final Class _objectType;
/**
* Constructor.
* @param decoder An instance of BoundDecoder to decode objects.
* @param objectType Type of objects to deserialize.
*/
public ObjectDeserializer(BoundDecoder decoder, Class objectType) {
_decoder = decoder;
_objectType = objectType;
}
/**
* Deserializes an object using the IDataReader as an input stream.
*
* @param input An instance of MemoryDataInput to read the serialized object.
* @return The instance of deserialized object, or null if null was serialized.
*/
public Object deserialize(MemoryDataInput input) {
if (!input.hasAvail() || input.readByte() != BooleanDataType.TRUE)
return null;
long messageTime = 0;
CharSequence symbol = null;
if (InstrumentMessage.class.isAssignableFrom(_objectType)) {
messageTime = TimeCodec.readNanoTime(input);
symbol = input.readString();
}
Object message = readMessageBody(input);
if (message instanceof InstrumentMessage) {
InstrumentMessage instrument = (InstrumentMessage)message;
instrument.setNanoTime(messageTime);
instrument.setSymbol(symbol);
}
return message;
}
/**
* Reads body of the message from the provided IDataReader
*
* @param input An instance of MemoryDataInput to read the object from
*/
protected Object readMessageBody(MemoryDataInput input) {
return _decoder.decode(input);
}
}