/// <summary>
/// Extrae un personaje de la fuente de datos en JSON.
/// </summary>
/// <param name="name">
/// El nombre del pesonaje a extraer de la fuente de datos.
/// </param>
/// <returns>
/// Un objeto Character cuyo nombre coincide con el solicitado.
/// </returns>
/// <pre>true</pre>
/// <post>(this.Contains(name) => (returnValue != null) && (returnValue.Name.Equals(name)))</post>
public FullCharacter GetCharacterFromSource(string name)
{
FullCharacter character = null;
// Obtenemos un lector de tokens de Json. Para ello creamos primero un stream de la
// cadena json, luego creamos un lector de texto usando ese stream y por último creamos
// un lector de tokens utilizando el lector de texto y lo inicializamos
JsonReader reader = new JsonTextReader(new StringReader(jsonString));
JTokenReader tokenreader = new JTokenReader(JToken.ReadFrom(reader));
tokenreader.Read();
// Obtenemos el token cuyo nombre corresponde al deseado, utilizando para ello una
// expresión JSonPath
// Para más información sobre JPath: http://goessner.net/articles/JsonPath/
JToken token = tokenreader.CurrentToken.SelectToken("$.[?(@.name=='" + name + "')]", false);
// Si existe un token con dihco nombre, existe el personaje buscado
if (token != null)
{
// Creamos un nuevo objeto de tipo Character e incrementamos el correspondiente
// contador
character = new FullCharacter();
createdCharacters++;
// Extraemos el valor de la Propiedad Nombre del correspondiente token
character.Name = token.SelectToken("name").Value<String>();
// Extraemos el valor de la Propiedad Nombre del correspondiente token
character.Description = token.SelectToken("description").Value<String>();
IEnumerable<JToken> relatedCharactersTokens = token.SelectToken("related_characters").Values<JToken>();
// Construimos la colección de personajes relacionados con la colección de tokens JSON
FillRelatedCharacters(character, relatedCharactersTokens);
} // if
// Cerramos los lectores que estén abiertos
tokenreader.Close();
reader.Close();
return character;
}
public void JTokenReader()
{
PersonRaw raw = new PersonRaw
{
FirstName = "FirstNameValue",
RawContent = new JRaw("[1,2,3,4,5]"),
LastName = "LastNameValue"
};
JObject o = JObject.FromObject(raw);
JsonReader reader = new JTokenReader(o);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.StartObject, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.PropertyName, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.String, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.PropertyName, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.Raw, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.PropertyName, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.String, reader.TokenType);
Assert.IsTrue(reader.Read());
Assert.AreEqual(JsonToken.EndObject, reader.TokenType);
Assert.IsFalse(reader.Read());
}
public void InitialPath_ArrayBase_ArrayToken()
{
JArray a = new JArray
{
1, 2
};
JTokenReader reader = new JTokenReader(a, "[0]");
Assert.AreEqual("[0]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0][0]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0][1]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0]", reader.Path);
Assert.IsFalse(reader.Read());
Assert.AreEqual("[0]", reader.Path);
}
public void YahooFinance()
{
JObject o =
new JObject(
new JProperty("Test1", new DateTime(2000, 10, 15, 5, 5, 5, DateTimeKind.Utc)),
new JProperty("Test2", new DateTimeOffset(2000, 10, 15, 5, 5, 5, new TimeSpan(11, 11, 0))),
new JProperty("Test3", "Test3Value"),
new JProperty("Test4", null)
);
using (JTokenReader jsonReader = new JTokenReader(o))
{
IJsonLineInfo lineInfo = jsonReader;
jsonReader.Read();
Assert.AreEqual(JsonToken.StartObject, jsonReader.TokenType);
Assert.AreEqual(false, lineInfo.HasLineInfo());
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test1", jsonReader.Value);
Assert.AreEqual(false, lineInfo.HasLineInfo());
jsonReader.Read();
Assert.AreEqual(JsonToken.Date, jsonReader.TokenType);
Assert.AreEqual(new DateTime(2000, 10, 15, 5, 5, 5, DateTimeKind.Utc), jsonReader.Value);
Assert.AreEqual(false, lineInfo.HasLineInfo());
Assert.AreEqual(0, lineInfo.LinePosition);
Assert.AreEqual(0, lineInfo.LineNumber);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test2", jsonReader.Value);
jsonReader.Read();
Assert.AreEqual(JsonToken.Date, jsonReader.TokenType);
Assert.AreEqual(new DateTimeOffset(2000, 10, 15, 5, 5, 5, new TimeSpan(11, 11, 0)), jsonReader.Value);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test3", jsonReader.Value);
jsonReader.Read();
Assert.AreEqual(JsonToken.String, jsonReader.TokenType);
Assert.AreEqual("Test3Value", jsonReader.Value);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test4", jsonReader.Value);
jsonReader.Read();
Assert.AreEqual(JsonToken.Null, jsonReader.TokenType);
Assert.AreEqual(null, jsonReader.Value);
Assert.IsTrue(jsonReader.Read());
Assert.AreEqual(JsonToken.EndObject, jsonReader.TokenType);
Assert.IsFalse(jsonReader.Read());
Assert.AreEqual(JsonToken.None, jsonReader.TokenType);
}
using (JsonReader jsonReader = new JTokenReader(o.Property("Test2")))
{
Assert.IsTrue(jsonReader.Read());
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test2", jsonReader.Value);
Assert.IsTrue(jsonReader.Read());
Assert.AreEqual(JsonToken.Date, jsonReader.TokenType);
Assert.AreEqual(new DateTimeOffset(2000, 10, 15, 5, 5, 5, new TimeSpan(11, 11, 0)), jsonReader.Value);
Assert.IsFalse(jsonReader.Read());
Assert.AreEqual(JsonToken.None, jsonReader.TokenType);
}
}
public void InitialPath_ArrayBase_PropertyToken()
{
JObject o = new JObject
{
{ "prop1", true }
};
JTokenReader reader = new JTokenReader(o, "[0]");
Assert.AreEqual("[0]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0]", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0].prop1", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0].prop1", reader.Path);
Assert.IsTrue(reader.Read());
Assert.AreEqual("[0]", reader.Path);
Assert.IsFalse(reader.Read());
Assert.AreEqual("[0]", reader.Path);
}
public void ReadBytesFailure()
{
ExceptionAssert.Throws<JsonReaderException>(() =>
{
JObject o =
new JObject(
new JProperty("Test1", 1)
);
using (JTokenReader jsonReader = new JTokenReader(o))
{
jsonReader.Read();
Assert.AreEqual(JsonToken.StartObject, jsonReader.TokenType);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test1", jsonReader.Value);
jsonReader.ReadAsBytes();
}
}, "Error reading bytes. Unexpected token: Integer. Path 'Test1'.");
}
public void ReadBytes()
{
byte[] data = Encoding.UTF8.GetBytes("Hello world!");
JObject o =
new JObject(
new JProperty("Test1", data)
);
using (JTokenReader jsonReader = new JTokenReader(o))
{
jsonReader.Read();
Assert.AreEqual(JsonToken.StartObject, jsonReader.TokenType);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test1", jsonReader.Value);
byte[] readBytes = jsonReader.ReadAsBytes();
Assert.AreEqual(data, readBytes);
Assert.IsTrue(jsonReader.Read());
Assert.AreEqual(JsonToken.EndObject, jsonReader.TokenType);
Assert.IsFalse(jsonReader.Read());
Assert.AreEqual(JsonToken.None, jsonReader.TokenType);
}
}
public void ReadLineInfo()
{
string input = @"{
CPU: 'Intel',
Drives: [
'DVD read/writer',
""500 gigabyte hard drive""
]
}";
JObject o = JObject.Parse(input);
using (JTokenReader jsonReader = new JTokenReader(o))
{
IJsonLineInfo lineInfo = jsonReader;
Assert.AreEqual(jsonReader.TokenType, JsonToken.None);
Assert.AreEqual(0, lineInfo.LineNumber);
Assert.AreEqual(0, lineInfo.LinePosition);
Assert.AreEqual(false, lineInfo.HasLineInfo());
Assert.AreEqual(null, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.StartObject);
Assert.AreEqual(1, lineInfo.LineNumber);
Assert.AreEqual(1, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.PropertyName);
Assert.AreEqual(jsonReader.Value, "CPU");
Assert.AreEqual(2, lineInfo.LineNumber);
Assert.AreEqual(7, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o.Property("CPU"), jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.String);
Assert.AreEqual(jsonReader.Value, "Intel");
Assert.AreEqual(2, lineInfo.LineNumber);
Assert.AreEqual(15, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o.Property("CPU").Value, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.PropertyName);
Assert.AreEqual(jsonReader.Value, "Drives");
Assert.AreEqual(3, lineInfo.LineNumber);
Assert.AreEqual(10, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o.Property("Drives"), jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.StartArray);
Assert.AreEqual(3, lineInfo.LineNumber);
Assert.AreEqual(12, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o.Property("Drives").Value, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.String);
Assert.AreEqual(jsonReader.Value, "DVD read/writer");
Assert.AreEqual(4, lineInfo.LineNumber);
Assert.AreEqual(22, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o["Drives"][0], jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.String);
Assert.AreEqual(jsonReader.Value, "500 gigabyte hard drive");
Assert.AreEqual(5, lineInfo.LineNumber);
Assert.AreEqual(30, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o["Drives"][1], jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.EndArray);
Assert.AreEqual(3, lineInfo.LineNumber);
Assert.AreEqual(12, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o["Drives"], jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.EndObject);
Assert.AreEqual(1, lineInfo.LineNumber);
Assert.AreEqual(1, lineInfo.LinePosition);
Assert.AreEqual(true, lineInfo.HasLineInfo());
Assert.AreEqual(o, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.None);
Assert.AreEqual(null, jsonReader.CurrentToken);
jsonReader.Read();
Assert.AreEqual(jsonReader.TokenType, JsonToken.None);
Assert.AreEqual(null, jsonReader.CurrentToken);
}
}
public void ReadBytesFailure()
{
JObject o =
new JObject(
new JProperty("Test1", 1)
);
using (JTokenReader jsonReader = new JTokenReader(o))
{
jsonReader.Read();
Assert.AreEqual(JsonToken.StartObject, jsonReader.TokenType);
jsonReader.Read();
Assert.AreEqual(JsonToken.PropertyName, jsonReader.TokenType);
Assert.AreEqual("Test1", jsonReader.Value);
jsonReader.ReadAsBytes();
}
}
