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 static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkNotNull;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.math.BigInteger;
  
  /**
   * A {@link BigIntegerCoder} encodes a {@link BigInteger} as a byte array containing the big endian
   * two's-complement representation, encoded via {@link ByteArrayCoder}.
   */
  public class BigIntegerCoder extends AtomicCoder<BigInteger> {
  
    public static BigIntegerCoder of() {
      return INSTANCE;
    }
  
    /////////////////////////////////////////////////////////////////////////////
  
    private static final BigIntegerCoder INSTANCE = new BigIntegerCoder();
    private static final ByteArrayCoder BYTE_ARRAY_CODER = ByteArrayCoder.of();
  
    private BigIntegerCoder() {}
  
    @Override
    public void encode(BigInteger value, OutputStream outStream) throws IOException, CoderException {
      encode(value, outStream, Context.NESTED);
    }
  
    @Override
    public void encode(BigInteger value, OutputStream outStream, Context context)
        throws IOException, CoderException {
      checkNotNull(value, String.format("cannot encode a null %s", BigInteger.class.getSimpleName()));
      BYTE_ARRAY_CODER.encode(value.toByteArray(), outStream, context);
    }
  
    @Override
    public BigInteger decode(InputStream inStream) throws IOException, CoderException {
      return decode(inStream, Context.NESTED);
    }
  
    @Override
    public BigInteger decode(InputStream inStream, Context context)
        throws IOException, CoderException {
      return new BigInteger(BYTE_ARRAY_CODER.decode(inStream, context));
    }
  
    @Override
    public void verifyDeterministic() {
      BYTE_ARRAY_CODER.verifyDeterministic();
    }
  
    /**
     * {@inheritDoc}
     *
     * @return {@code true}. This coder is injective.
     */
    @Override
    public boolean consistentWithEquals() {
      return true;
    }
  
    /**
     * {@inheritDoc}
     *
     * @return {@code true}, because {@link #getEncodedElementByteSize} runs in constant time.
     */
    @Override
    public boolean isRegisterByteSizeObserverCheap(BigInteger value) {
      return true;
    }
  
    /**
     * {@inheritDoc}
     *
     * @return the size of the encoding as a byte array according to {@link ByteArrayCoder}
     */
    @Override
    protected long getEncodedElementByteSize(BigInteger value) throws Exception {
      checkNotNull(value, String.format("cannot encode a null %s", BigInteger.class.getSimpleName()));
      return BYTE_ARRAY_CODER.getEncodedElementByteSize(value.toByteArray());
    }
  }
  