//Copyright 2012 Joe McTee
//
// 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.jeklsoft.cassandraclient.astyanax;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.Arrays;
import org.apache.log4j.Logger;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import com.jeklsoft.cassandraclient.Reading;
import com.jeklsoft.cassandraclient.ReadingBuffer;
import com.netflix.astyanax.Serializer;
import com.netflix.astyanax.serializers.AbstractSerializer;
import com.netflix.astyanax.serializers.BigIntegerSerializer;
public class ReadingSerializer extends AbstractSerializer<Reading> {
private static final Logger log = Logger.getLogger(ReadingSerializer.class);
private static final ReadingSerializer instance = new ReadingSerializer();
public static ReadingSerializer get() {
return instance;
}
@Override
public ByteBuffer toByteBuffer(Reading reading) {
ReadingBuffer.Reading bufferedReading = getBufferedReading(reading);
byte[] array = bufferedReading.toByteString().toByteArray();
ByteBuffer buffer = ByteBuffer.wrap(array);
return buffer;
}
@Override
public Reading fromByteBuffer(ByteBuffer byteBuffer) {
try {
int startingIndex = byteBuffer.position();
int endingIndex = byteBuffer.limit();
byte[] byteArray = Arrays.copyOfRange(byteBuffer.array(), startingIndex, endingIndex);
ReadingBuffer.Reading bufferedReading = ReadingBuffer.Reading.newBuilder().mergeFrom(byteArray).build();
return getReading(bufferedReading);
}
catch (InvalidProtocolBufferException e) {
throw new RuntimeException("Error deserializing Reading", e);
}
}
private static ReadingBuffer.Reading getBufferedReading(Reading reading) {
return ReadingBuffer.Reading.newBuilder()
.setTemperature(getByteString(BigDecimalSerializer.get(), reading.getTemperature()))
.setWindSpeed(reading.getWindSpeed())
.setWindDirection(reading.getDirection())
.setHumidity(getByteString(BigIntegerSerializer.get(), reading.getHumidity()))
.setBadAirQualityDetected(reading.getBadAirQualityDetected())
.build();
}
private static Reading getReading(ReadingBuffer.Reading bufferedReading) {
return new Reading((BigDecimal) getObject(BigDecimalSerializer.get(), bufferedReading.getTemperature()),
bufferedReading.getWindSpeed(),
bufferedReading.getWindDirection(),
(BigInteger) getObject(BigIntegerSerializer.get(), bufferedReading.getHumidity()),
bufferedReading.getBadAirQualityDetected());
}
private static ByteString getByteString(Serializer serializer, Object object) {
byte[] bytes = serializer.toByteBuffer(object).array();
return ByteString.copyFrom(bytes);
}
private static Object getObject(Serializer serializer, ByteString bytes) {
return serializer.fromBytes(bytes.toByteArray());
}
}