content: /*
   * 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 com.datastax.oss.driver.internal.core.type.codec.extras.vector;
  
  import com.datastax.oss.driver.api.core.ProtocolVersion;
  import com.datastax.oss.driver.api.core.type.VectorType;
  import com.datastax.oss.driver.api.core.type.reflect.GenericType;
  import com.datastax.oss.driver.internal.core.type.codec.FloatCodec;
  import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
  import com.datastax.oss.driver.shaded.guava.common.base.Splitter;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.Objects;
  
  /** A codec that maps CQL vectors to the Java type {@code float[]}. */
  public class FloatVectorToArrayCodec extends AbstractVectorToArrayCodec<float[]> {
  
    public FloatVectorToArrayCodec(VectorType type) {
      super(type, GenericType.of(float[].class));
    }
  
    @Override
    public boolean accepts(@NonNull Class<?> javaClass) {
      Objects.requireNonNull(javaClass);
      return float[].class.equals(javaClass);
    }
  
    @Override
    public boolean accepts(@NonNull Object value) {
      Objects.requireNonNull(value);
      return value instanceof float[];
    }
  
    @NonNull
    @Override
    protected float[] newInstance() {
      return new float[cqlType.getDimensions()];
    }
  
    @Override
    protected int sizeOfComponentType() {
      return 4;
    }
  
    @Override
    protected void serializeElement(
        @NonNull ByteBuffer output,
        @NonNull float[] array,
        int index,
        @NonNull ProtocolVersion protocolVersion) {
      output.putFloat(array[index]);
    }
  
    @Override
    protected void deserializeElement(
        @NonNull ByteBuffer input,
        @NonNull float[] array,
        int index,
        @NonNull ProtocolVersion protocolVersion) {
      array[index] = input.getFloat();
    }
  
    @NonNull
    @Override
    public String format(@Nullable float[] value) {
      return value == null ? "NULL" : Arrays.toString(value);
    }
  
    @Nullable
    @Override
    public float[] parse(@Nullable String str) {
      Preconditions.checkArgument(str != null, "Cannot create float array from null string");
      Preconditions.checkArgument(!str.isEmpty(), "Cannot create float array from empty string");
  
      FloatCodec codec = new FloatCodec();
      float[] rv = this.newInstance();
      Iterator<String> strIter =
          Splitter.on(", ").trimResults().split(str.substring(1, str.length() - 1)).iterator();
      for (int i = 0; i < rv.length; ++i) {
        String strVal = strIter.next();
        if (strVal == null) {
          throw new IllegalArgumentException("Null element observed in float array string");
        }
        Float f = codec.parse(strVal);
        rv[i] = f.floatValue();
      }
      return rv;
    }
  }
  