clients/src/main/java/org/apache/kafka/common/serialization/DoubleDeserializer.java

/**
 * 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 org.apache.kafka.common.serialization;

import org.apache.kafka.common.errors.SerializationException;

import java.util.Map;

public class DoubleDeserializer implements Deserializer<Double> {

    @Override
    public void configure(Map<String, ?> configs, boolean isKey) {
        // nothing to do
    }

    @Override
    public Double deserialize(String topic, byte[] data) {
        if (data == null)
            return null;
        if (data.length != 8) {
            throw new SerializationException("Size of data received by Deserializer is not 8");
        }

        long value = 0;
        for (byte b : data) {
            value <<= 8;
            value |= b & 0xFF;
        }
        return Double.longBitsToDouble(value);
    }

    @Override
    public void close() {
        // nothing to do
    }
}