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 org.apache.beam.sdk.coders;
  
  import java.io.DataOutputStream;
  import java.io.EOFException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.UTFDataFormatException;
  import org.apache.beam.sdk.values.TypeDescriptor;
  
  /** A {@link FloatCoder} encodes {@link Float} values in 4 bytes using Java serialization. */
  public class FloatCoder extends AtomicCoder<Float> {
  
    public static FloatCoder of() {
      return INSTANCE;
    }
  
    /////////////////////////////////////////////////////////////////////////////
  
    private static final FloatCoder INSTANCE = new FloatCoder();
    private static final TypeDescriptor<Float> TYPE_DESCRIPTOR = new TypeDescriptor<Float>() {};
  
    private FloatCoder() {}
  
    @Override
    public void encode(Float value, OutputStream outStream) throws IOException, CoderException {
      if (value == null) {
        throw new CoderException("cannot encode a null Float");
      }
      new DataOutputStream(outStream).writeFloat(value);
    }
  
    @Override
    public Float decode(InputStream inStream) throws IOException, CoderException {
      try {
        return Float.intBitsToFloat(BitConverters.readBigEndianInt(inStream));
      } catch (EOFException | UTFDataFormatException exn) {
        // These exceptions correspond to decoding problems, so change
        // what kind of exception they're branded as.
        throw new CoderException(exn);
      }
    }
  
    /**
     * {@inheritDoc}
     *
     * @throws NonDeterministicException always. Floating-point operations are not guaranteed to be
     *     deterministic, even if the storage format might be, so floating point representations are
     *     not recommended for use in operations that require deterministic inputs.
     */
    @Override
    public void verifyDeterministic() throws NonDeterministicException {
      throw new NonDeterministicException(
          this, "Floating point encodings are not guaranteed to be deterministic.");
    }
  
    /**
     * {@inheritDoc}
     *
     * @return {@code true}. This coder is injective.
     */
    @Override
    public boolean consistentWithEquals() {
      return true;
    }
  
    /**
     * {@inheritDoc}
     *
     * @return {@code true}. {@link FloatCoder#getEncodedElementByteSize} returns a constant.
     */
    @Override
    public boolean isRegisterByteSizeObserverCheap(Float value) {
      return true;
    }
  
    @Override
    public TypeDescriptor<Float> getEncodedTypeDescriptor() {
      return TYPE_DESCRIPTOR;
    }
  
    /**
     * {@inheritDoc}
     *
     * @return {@code 4}, the byte size of a {@link Float} encoded using Java serialization.
     */
    @Override
    protected long getEncodedElementByteSize(Float value) throws Exception {
      if (value == null) {
        throw new CoderException("cannot encode a null Float");
      }
      return 4;
    }
  }
  