/*
* 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.oss.driver.internal.core.type.codec.extras.array;
import com.datastax.oss.driver.api.core.ProtocolVersion;
import com.datastax.oss.driver.api.core.type.DataTypes;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.nio.ByteBuffer;
import java.util.Objects;
import net.jcip.annotations.Immutable;
A codec that maps the CQL type list<double>
to the Java type double[]
. Note that this codec is designed for performance and converts CQL lists directly to double[]
, thus avoiding any unnecessary boxing and unboxing of Java primitive
double
values; it also instantiates arrays without the need for an intermediary Java
List
object.
/**
* A codec that maps the CQL type {@code list<double>} to the Java type {@code double[]}.
*
* <p>Note that this codec is designed for performance and converts CQL lists <em>directly</em> 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.
*/
@Immutable
public class DoubleListToArrayCodec extends AbstractPrimitiveListToArrayCodec<double[]> {
public DoubleListToArrayCodec() {
super(DataTypes.listOf(DataTypes.DOUBLE), GenericType.of(double[].class));
}
@Override
public boolean accepts(@NonNull Class<?> javaClass) {
Objects.requireNonNull(javaClass);
return double[].class.equals(javaClass);
}
@Override
public boolean accepts(@NonNull Object value) {
Objects.requireNonNull(value);
return value instanceof double[];
}
@Override
protected int sizeOfComponentType() {
return 8;
}
@Override
protected void serializeElement(
@NonNull ByteBuffer output,
@NonNull double[] array,
int index,
@NonNull ProtocolVersion protocolVersion) {
output.putDouble(array[index]);
}
@Override
protected void deserializeElement(
@NonNull ByteBuffer input,
@NonNull double[] array,
int index,
@NonNull ProtocolVersion protocolVersion) {
array[index] = input.getDouble();
}
@Override
protected void formatElement(@NonNull StringBuilder output, @NonNull double[] array, int index) {
output.append(array[index]);
}
@Override
protected void parseElement(@NonNull String input, @NonNull double[] array, int index) {
array[index] = Double.parseDouble(input);
}
@NonNull
@Override
protected double[] newInstance(int size) {
return new double[size];
}
}