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using System;
using Newtonsoft.Json.Utilities;
namespace Newtonsoft.Json.Linq
{
/// <summary>
/// Represents a reader that provides fast, non-cached, forward-only access to serialized Json data.
/// </summary>
public class JTokenReader : JsonReader, IJsonLineInfo
{
private readonly JToken _root;
private JToken _parent;
private JToken _current;
/// <summary>
/// Initializes a new instance of the <see cref="JTokenReader"/> class.
/// </summary>
/// <param name="token">The token to read from.</param>
public JTokenReader(JToken token)
{
ValidationUtils.ArgumentNotNull(token, "token");
_root = token;
_current = token;
}
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="T:Byte[]"/>.
/// </summary>
/// <returns>
/// A <see cref="T:Byte[]"/> or a null reference if the next JSON token is null. This method will return <c>null</c> at the end of an array.
/// </returns>
public override byte[] ReadAsBytes()
{
return ReadAsBytesInternal();
}
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="Nullable{Decimal}"/>.
/// </summary>
/// <returns>A <see cref="Nullable{Decimal}"/>. This method will return <c>null</c> at the end of an array.</returns>
public override decimal? ReadAsDecimal()
{
return ReadAsDecimalInternal();
}
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="Nullable{Int32}"/>.
/// </summary>
/// <returns>A <see cref="Nullable{Int32}"/>. This method will return <c>null</c> at the end of an array.</returns>
public override int? ReadAsInt32()
{
return ReadAsInt32Internal();
}
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="String"/>.
/// </summary>
/// <returns>A <see cref="String"/>. This method will return <c>null</c> at the end of an array.</returns>
public override string ReadAsString()
{
return ReadAsStringInternal();
}
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="Nullable{DateTime}"/>.
/// </summary>
/// <returns>A <see cref="String"/>. This method will return <c>null</c> at the end of an array.</returns>
public override DateTime? ReadAsDateTime()
{
return ReadAsDateTimeInternal();
}
#if !NET20
/// <summary>
/// Reads the next JSON token from the stream as a <see cref="Nullable{DateTimeOffset}"/>.
/// </summary>
/// <returns>A <see cref="Nullable{DateTimeOffset}"/>. This method will return <c>null</c> at the end of an array.</returns>
public override DateTimeOffset? ReadAsDateTimeOffset()
{
return ReadAsDateTimeOffsetInternal();
}
#endif
internal override bool ReadInternal()
{
if (CurrentState != State.Start)
{
JContainer container = _current as JContainer;
if (container != null && _parent != container)
return ReadInto(container);
else
return ReadOver(_current);
}
SetToken(_current);
return true;
}
/// <summary>
/// Reads the next JSON token from the stream.
/// </summary>
/// <returns>
/// true if the next token was read successfully; false if there are no more tokens to read.
/// </returns>
public override bool Read()
{
_readType = ReadType.Read;
return ReadInternal();
}
private bool ReadOver(JToken t)
{
if (t == _root)
return ReadToEnd();
JToken next = t.Next;
if ((next == null || next == t) || t == t.Parent.Last)
{
if (t.Parent == null)
return ReadToEnd();
return SetEnd(t.Parent);
}
else
{
_current = next;
SetToken(_current);
return true;
}
}
private bool ReadToEnd()
{
SetToken(JsonToken.None);
return false;
}
private bool IsEndElement
{
get { return (_current == _parent); }
}
private JsonToken? GetEndToken(JContainer c)
{
switch (c.Type)
{
case JTokenType.Object:
return JsonToken.EndObject;
case JTokenType.Array:
return JsonToken.EndArray;
case JTokenType.Constructor:
return JsonToken.EndConstructor;
case JTokenType.Property:
return null;
default:
throw MiscellaneousUtils.CreateArgumentOutOfRangeException("Type", c.Type, "Unexpected JContainer type.");
}
}
private bool ReadInto(JContainer c)
{
JToken firstChild = c.First;
if (firstChild == null)
{
return SetEnd(c);
}
else
{
SetToken(firstChild);
_current = firstChild;
_parent = c;
return true;
}
}
private bool SetEnd(JContainer c)
{
JsonToken? endToken = GetEndToken(c);
if (endToken != null)
{
SetToken(endToken.Value);
_current = c;
_parent = c;
return true;
}
else
{
return ReadOver(c);
}
}
private void SetToken(JToken token)
{
switch (token.Type)
{
case JTokenType.Object:
SetToken(JsonToken.StartObject);
break;
case JTokenType.Array:
SetToken(JsonToken.StartArray);
break;
case JTokenType.Constructor:
SetToken(JsonToken.StartConstructor);
break;
case JTokenType.Property:
SetToken(JsonToken.PropertyName, ((JProperty)token).Name);
break;
case JTokenType.Comment:
SetToken(JsonToken.Comment, ((JValue)token).Value);
break;
case JTokenType.Integer:
SetToken(JsonToken.Integer, ((JValue)token).Value);
break;
case JTokenType.Float:
SetToken(JsonToken.Float, ((JValue)token).Value);
break;
case JTokenType.String:
SetToken(JsonToken.String, ((JValue)token).Value);
break;
case JTokenType.Boolean:
SetToken(JsonToken.Boolean, ((JValue)token).Value);
break;
case JTokenType.Null:
SetToken(JsonToken.Null, ((JValue)token).Value);
break;
case JTokenType.Undefined:
SetToken(JsonToken.Undefined, ((JValue)token).Value);
break;
case JTokenType.Date:
SetToken(JsonToken.Date, ((JValue)token).Value);
break;
case JTokenType.Raw:
SetToken(JsonToken.Raw, ((JValue)token).Value);
break;
case JTokenType.Bytes:
SetToken(JsonToken.Bytes, ((JValue)token).Value);
break;
case JTokenType.Guid:
SetToken(JsonToken.String, SafeToString(((JValue)token).Value));
break;
case JTokenType.Uri:
SetToken(JsonToken.String, SafeToString(((JValue)token).Value));
break;
case JTokenType.TimeSpan:
SetToken(JsonToken.String, SafeToString(((JValue)token).Value));
break;
default:
throw MiscellaneousUtils.CreateArgumentOutOfRangeException("Type", token.Type, "Unexpected JTokenType.");
}
}
private string SafeToString(object value)
{
return (value != null) ? value.ToString() : null;
}
bool IJsonLineInfo.HasLineInfo()
{
if (CurrentState == State.Start)
return false;
IJsonLineInfo info = IsEndElement ? null : _current;
return (info != null && info.HasLineInfo());
}
int IJsonLineInfo.LineNumber
{
get
{
if (CurrentState == State.Start)
return 0;
IJsonLineInfo info = IsEndElement ? null : _current;
if (info != null)
return info.LineNumber;
return 0;
}
}
int IJsonLineInfo.LinePosition
{
get
{
if (CurrentState == State.Start)
return 0;
IJsonLineInfo info = IsEndElement ? null : _current;
if (info != null)
return info.LinePosition;
return 0;
}
}
}
}
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