content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.Map;
  
  /** A writer that performs serialization of protobuf message fields. */
  @ExperimentalApi
  interface Writer {
  
    /** The order in which the fields are written by a {@link Writer}. */
    enum FieldOrder {
      /** Fields are written in ascending order by field number. */
      ASCENDING,
  
      /** Fields are written in descending order by field number. */
      DESCENDING
    }
  
    /** Indicates the order in which the fields are written by this {@link Writer}. */
    FieldOrder fieldOrder();
  
    /** Writes a field of type {@link FieldType#SFIXED32}. */
    void writeSFixed32(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#INT64}. */
    void writeInt64(int fieldNumber, long value) throws IOException;
  
    /** Writes a field of type {@link FieldType#SFIXED64}. */
    void writeSFixed64(int fieldNumber, long value) throws IOException;
  
    /** Writes a field of type {@link FieldType#FLOAT}. */
    void writeFloat(int fieldNumber, float value) throws IOException;
  
    /** Writes a field of type {@link FieldType#DOUBLE}. */
    void writeDouble(int fieldNumber, double value) throws IOException;
  
    /** Writes a field of type {@link FieldType#ENUM}. */
    void writeEnum(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#UINT64}. */
    void writeUInt64(int fieldNumber, long value) throws IOException;
  
    /** Writes a field of type {@link FieldType#INT32}. */
    void writeInt32(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#FIXED64}. */
    void writeFixed64(int fieldNumber, long value) throws IOException;
  
    /** Writes a field of type {@link FieldType#FIXED32}. */
    void writeFixed32(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#BOOL}. */
    void writeBool(int fieldNumber, boolean value) throws IOException;
  
    /** Writes a field of type {@link FieldType#STRING}. */
    void writeString(int fieldNumber, String value) throws IOException;
  
    /** Writes a field of type {@link FieldType#BYTES}. */
    void writeBytes(int fieldNumber, ByteString value) throws IOException;
  
    /** Writes a field of type {@link FieldType#UINT32}. */
    void writeUInt32(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#SINT32}. */
    void writeSInt32(int fieldNumber, int value) throws IOException;
  
    /** Writes a field of type {@link FieldType#SINT64}. */
    void writeSInt64(int fieldNumber, long value) throws IOException;
  
    /** Writes a field of type {@link FieldType#MESSAGE}. */
    void writeMessage(int fieldNumber, Object value) throws IOException;
  
    /** Writes a field of type {@link FieldType#MESSAGE}. */
    void writeMessage(int fieldNumber, Object value, Schema schema) throws IOException;
  
    /**
     * Writes a field of type {@link FieldType#GROUP}.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeGroup(int fieldNumber, Object value) throws IOException;
  
    /**
     * Writes a field of type {@link FieldType#GROUP}.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeGroup(int fieldNumber, Object value, Schema schema) throws IOException;
  
    /**
     * Writes a single start group tag.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeStartGroup(int fieldNumber) throws IOException;
  
    /**
     * Writes a single end group tag.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeEndGroup(int fieldNumber) throws IOException;
  
    /** Writes a list field of type {@link FieldType#INT32}. */
    void writeInt32List(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#FIXED32}. */
    void writeFixed32List(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#INT64}. */
    void writeInt64List(int fieldNumber, List<Long> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#UINT64}. */
    void writeUInt64List(int fieldNumber, List<Long> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#FIXED64}. */
    void writeFixed64List(int fieldNumber, List<Long> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#FLOAT}. */
    void writeFloatList(int fieldNumber, List<Float> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#DOUBLE}. */
    void writeDoubleList(int fieldNumber, List<Double> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#ENUM}. */
    void writeEnumList(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#BOOL}. */
    void writeBoolList(int fieldNumber, List<Boolean> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#STRING}. */
    void writeStringList(int fieldNumber, List<String> value) throws IOException;
  
    /** Writes a list field of type {@link FieldType#BYTES}. */
    void writeBytesList(int fieldNumber, List<ByteString> value) throws IOException;
  
    /** Writes a list field of type {@link FieldType#UINT32}. */
    void writeUInt32List(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#SFIXED32}. */
    void writeSFixed32List(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#SFIXED64}. */
    void writeSFixed64List(int fieldNumber, List<Long> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#SINT32}. */
    void writeSInt32List(int fieldNumber, List<Integer> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#SINT64}. */
    void writeSInt64List(int fieldNumber, List<Long> value, boolean packed) throws IOException;
  
    /** Writes a list field of type {@link FieldType#MESSAGE}. */
    void writeMessageList(int fieldNumber, List<?> value) throws IOException;
  
    /** Writes a list field of type {@link FieldType#MESSAGE}. */
    void writeMessageList(int fieldNumber, List<?> value, Schema schema) throws IOException;
  
    /**
     * Writes a list field of type {@link FieldType#GROUP}.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeGroupList(int fieldNumber, List<?> value) throws IOException;
  
    /**
     * Writes a list field of type {@link FieldType#GROUP}.
     *
     * @deprecated groups fields are deprecated.
     */
    @Deprecated
    void writeGroupList(int fieldNumber, List<?> value, Schema schema) throws IOException;
  
    /**
     * Writes a message field in {@code MessageSet} wire-format.
     *
     * @param value A message instance or an opaque {@link ByteString} for an unknown field.
     */
    void writeMessageSetItem(int fieldNumber, Object value) throws IOException;
  
    /** Writes a map field. */
    <K, V> void writeMap(int fieldNumber, MapEntryLite.Metadata<K, V> metadata, Map<K, V> map)
        throws IOException;
  }
  