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using System;
using System.Collections;
using System.Collections.Generic;
using Google.ProtocolBuffers.Descriptors;
namespace Google.ProtocolBuffers.Serialization
{
/// <summary>
/// Allows writing messages to a name/value dictionary
/// </summary>
public class DictionaryWriter : AbstractWriter
{
private readonly IDictionary<string, object> _output;
/// <summary>
/// Constructs a writer using a new dictionary
/// </summary>
public DictionaryWriter()
: this(new Dictionary<string, object>(StringComparer.Ordinal))
{
}
/// <summary>
/// Constructs a writer using an existing dictionary
/// </summary>
public DictionaryWriter(IDictionary<string, object> output)
{
ThrowHelper.ThrowIfNull(output, "output");
_output = output;
}
/// <summary>
/// Creates the dictionary instance for a child message.
/// </summary>
protected virtual DictionaryWriter Create()
{
return new DictionaryWriter();
}
/// <summary>
/// Accesses the dictionary that is backing this writer
/// </summary>
public IDictionary<string, object> ToDictionary()
{
return _output;
}
/// <summary>
/// Writes the message to the the formatted stream.
/// </summary>
public override void WriteMessage(IMessageLite message)
{
message.WriteTo(this);
}
/// <summary>
/// No-op
/// </summary>
public override void WriteMessageStart()
{ }
/// <summary>
/// No-op
/// </summary>
public override void WriteMessageEnd()
{ }
/// <summary>
/// Writes a Boolean value
/// </summary>
protected override void Write(string field, bool value)
{
_output[field] = value;
}
/// <summary>
/// Writes a Int32 value
/// </summary>
protected override void Write(string field, int value)
{
_output[field] = value;
}
/// <summary>
/// Writes a UInt32 value
/// </summary>
protected override void Write(string field, uint value)
{
_output[field] = value;
}
/// <summary>
/// Writes a Int64 value
/// </summary>
protected override void Write(string field, long value)
{
_output[field] = value;
}
/// <summary>
/// Writes a UInt64 value
/// </summary>
protected override void Write(string field, ulong value)
{
_output[field] = value;
}
/// <summary>
/// Writes a Single value
/// </summary>
protected override void Write(string field, float value)
{
_output[field] = value;
}
/// <summary>
/// Writes a Double value
/// </summary>
protected override void Write(string field, double value)
{
_output[field] = value;
}
/// <summary>
/// Writes a String value
/// </summary>
protected override void Write(string field, string value)
{
_output[field] = value;
}
/// <summary>
/// Writes a set of bytes
/// </summary>
protected override void Write(string field, ByteString value)
{
_output[field] = value.ToByteArray();
}
/// <summary>
/// Writes a message or group as a field
/// </summary>
protected override void WriteMessageOrGroup(string field, IMessageLite message)
{
DictionaryWriter writer = Create();
writer.WriteMessage(message);
_output[field] = writer.ToDictionary();
}
/// <summary>
/// Writes a System.Enum by the numeric and textual value
/// </summary>
protected override void WriteEnum(string field, int number, string name)
{
_output[field] = number;
}
/// <summary>
/// Writes an array of field values
/// </summary>
protected override void WriteArray(FieldType fieldType, string field, IEnumerable items)
{
List<object> objects = new List<object>();
foreach (object o in items)
{
switch (fieldType)
{
case FieldType.Group:
case FieldType.Message:
{
DictionaryWriter writer = Create();
writer.WriteMessage((IMessageLite) o);
objects.Add(writer.ToDictionary());
}
break;
case FieldType.Bytes:
objects.Add(((ByteString) o).ToByteArray());
break;
case FieldType.Enum:
if (o is IEnumLite)
{
objects.Add(((IEnumLite) o).Number);
}
else
{
objects.Add((int) o);
}
break;
default:
objects.Add(o);
break;
}
}
_output[field] = objects.ToArray();
}
}
}
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