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.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  /** A {@link Coder} for {@link Boolean}. */
  public class BooleanCoder extends AtomicCoder<Boolean> {
    private static final ByteCoder BYTE_CODER = ByteCoder.of();
  
    private static final BooleanCoder INSTANCE = new BooleanCoder();
  
    /** Returns the singleton instance of {@link BooleanCoder}. */
    public static BooleanCoder of() {
      return INSTANCE;
    }
  
    @Override
    public void encode(Boolean value, OutputStream os) throws IOException {
      BYTE_CODER.encode(value ? (byte) 1 : 0, os);
    }
  
    @Override
    public Boolean decode(InputStream is) throws IOException {
      Byte value = BYTE_CODER.decode(is);
      if (value == 0) {
        return false;
      } else if (value == 1) {
        return true;
      }
      throw new IOException(String.format("Expected 0 or 1, got %d", value));
    }
  
    @Override
    public boolean consistentWithEquals() {
      return true;
    }
  
    @Override
    public boolean isRegisterByteSizeObserverCheap(Boolean value) {
      return true;
    }
  
    @Override
    protected long getEncodedElementByteSize(Boolean value) throws Exception {
      return 1;
    }
  }
  