com.datastax.driver.extras.codecs.arrays.DoubleArrayCodec Maven / Gradle / Ivy
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/*
* Copyright DataStax, Inc.
*
* 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.datastax.driver.extras.codecs.arrays;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ProtocolVersion;
import java.nio.ByteBuffer;
/**
* A codec that maps the CQL type {@code list} to the Java type {@code double[]}.
*
* Note that this codec is designed for performance and converts CQL lists directly to
* {@code double[]}, thus avoiding any unnecessary boxing and unboxing of Java primitive {@code
* double} values; it also instantiates arrays without the need for an intermediary Java {@code
* List} object.
*/
public class DoubleArrayCodec extends AbstractPrimitiveArrayCodec {
public static final DoubleArrayCodec instance = new DoubleArrayCodec();
public DoubleArrayCodec() {
super(DataType.list(DataType.cdouble()), double[].class);
}
@Override
protected int sizeOfComponentType() {
return 8;
}
@Override
protected void serializeElement(
ByteBuffer output, double[] array, int index, ProtocolVersion protocolVersion) {
output.putDouble(array[index]);
}
@Override
protected void deserializeElement(
ByteBuffer input, double[] array, int index, ProtocolVersion protocolVersion) {
array[index] = input.getDouble();
}
@Override
protected void formatElement(StringBuilder output, double[] array, int index) {
output.append(array[index]);
}
@Override
protected void parseElement(String input, double[] array, int index) {
array[index] = Double.parseDouble(input);
}
@Override
protected double[] newInstance(int size) {
return new double[size];
}
}