/// <summary>
/// Create a deep copy of this instance.
/// </summary>
public IJSONValue DeepCopy()
{
IJSONValue copy = CreatePrototype();
copy.CopyValue(this);
return(copy);
}
/// <summary>
/// Copy the value of another IJSONValue into our underlying value.
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public override void CopyValue(IJSONValue value)
{
if (!GetType().IsAssignableFrom(value.GetType()))
{
throw new Exception("Can't assign a " + value.GetType().Name + " to a " + GetType().Name);
}
}
/// <summary>
/// Read a JSON value.
/// </summary>
/// <param name="path">JSON path to the value we're reading</param>
/// <param name="pbr">a pushback reader</param>
/// <returns>the next JSON value</returns>
/// <exception cref="System.IO.IOException" />
/// <exception cref="Gavaghan.JSON.JSONException" />
public IJSONValue Read(string path, PushbackReader pbr)
{
IJSONValue value;
char c = Demand(pbr);
// is it a string?
if (c == '\"')
{
value = OnString(path, pbr);
}
// is it a number?
else if (Char.IsDigit(c) || (c == '-'))
{
value = OnNumber(path, pbr);
}
// is it an array?
else if (c == '[')
{
value = OnArray(path, pbr);
}
// is it an object?
else if (c == '{')
{
value = OnObject(path, pbr);
}
// is it a boolean?
else if ((c == 't') || (c == 'f'))
{
value = OnBoolean(path, pbr);
}
// is it a null?
else if (c == 'n')
{
value = OnNull(path, pbr);
}
// else, value type
else
{
value = OnUnknown(path, pbr, c);
}
// unread trigger character
pbr.Unread(c);
// implementation specific read
value.Read(path, pbr);
// give subtype a chance to select a different implementation
IJSONValue recast = Recast(path, value);
// if value was recast, copy over original data
if (recast != null)
{
recast.CopyValue(value);
value = recast;
}
return(value);
}
static public object GetNotNull(IJSONValue json)
{
if (json == null)
{
throw new BadTrafficException("'null' not allowed");
}
return(json.Value);
}
/// <summary>
/// Render a JSONValue as a string.
/// </summary>
/// <param name="value">the IJSONValue to render</param>
/// <param name="pretty">'true' to pretty-print with line feeds and indentation, 'false'
/// to render on a single line.</param>
/// <returns>the rendered value</returns>
static public string ToString(IJSONValue value, bool pretty)
{
string str;
using (StringWriter writer = new StringWriter())
{
value.Write("", writer, pretty);
str = writer.ToString();
}
return(str);
}
/// <summary>
/// Read a JSON value (presumes the key has already been read) and set the
/// underlying value. There's generally no reason to call this method
/// directly. It is intended to be overridden by an extended type.
/// </summary>
/// <param name="path">path to the value being read</param>
/// <param name="pbr">source reader</param>
/// <exception cref="Gavaghan.JSON.JSONException">on grammar error</exception>
/// <exception cref="System.IO.IOException">on read failure</exception>
public override void Read(string path, PushbackReader pbr)
{
char c = JSONValueFactory.Demand(pbr);
if (c != '[')
{
throw new JSONException(path, "Content does not appear to be an array.");
}
// empty array is an easy out
mFactory.SkipWhitespace(pbr);
c = JSONValueFactory.Demand(pbr);
if (c == ']')
{
return;
}
pbr.Unread(c);
// loop through values
try
{
for (; ;)
{
IJSONValue value = mFactory.Read(path, pbr);
mValue.Add(value);
// get next non-whitespace
mFactory.SkipWhitespace(pbr);
c = JSONValueFactory.Demand(pbr);
// is end?
if (c == ']')
{
return;
}
// is more
if (c == ',')
{
mFactory.SkipWhitespace(pbr);
continue;
}
throw new JSONException(path, "Incorrectly formatted array: " + c);
}
}
finally
{
mFactory = null;
}
}
/// <summary>
/// Get a named value from a <code>JSONObject</code>. If the value
/// doesn't exist, make a default instance and add it.
/// </summary>
/// <param name="jsonObj">the <code>JSONObject</code> to get a value from</param>
/// <param name="name"></param>
/// <param name="jsonType"></param>
/// <returns></returns>
static public object GetOrSet(JSONObject jsonObj, String name, Type jsonType)
{
object retval;
// look to see if the value already exists
jsonObj.TryGetValue(name, out IJSONValue jsonValue);
// if it exists, it's easy - just return it after a type check
if (jsonValue != null)
{
// make sure we got the right object type
if (!jsonType.IsAssignableFrom(jsonValue.GetType()))
{
throw new Exception(String.Format("Value named '{0}' is of type '{1}' which is not assignable from '{2}'", name, jsonValue.GetType().Name, jsonType.Name));
}
retval = jsonValue.Value;
}
// otherwise, create a default
else
{
// ensure property types
if (!typeof(IJSONValue).IsAssignableFrom(jsonType))
{
throw new Exception(String.Format("Type '{0}' is not assignable from '{1}'", typeof(IJSONValue).Name, jsonType.Name));
}
try
{
ConstructorInfo ctx = jsonType.GetConstructor(NO_PARAMS);
if (ctx == null)
{
throw new Exception("'" + jsonType.Name + "' does not have a public default constructor");
}
IJSONValue newJSON = (IJSONValue)ctx.Invoke(NO_ARGS);
jsonObj.Add(name, newJSON);
retval = newJSON.Value;
}
catch (TargetInvocationException exc)
{
throw new Exception("Constructor for '" + jsonType.Name + "' threw an exception", exc.InnerException);
}
}
return(retval);
}
/// <summary>
/// Copy the value of another IJSONValue into our underlying value.
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public override void CopyValue(IJSONValue value)
{
if (!GetType().IsAssignableFrom(value.GetType()))
{
throw new Exception("Can't assign a " + value.GetType().Name + " to a " + GetType().Name);
}
IList <IJSONValue> source = (IList <IJSONValue>)value.Value;
mValue = new List <IJSONValue>();
foreach (IJSONValue json in source)
{
mValue.Add(json.DeepCopy());
}
}
static public string ToString(IJSONValue json)
{
if (json == null)
{
return("");
}
object value = json.Value;
string retval = "";
if (value != null)
{
retval = value.ToString();
}
return(retval);
}
/// <summary>
/// Maps a IJSONValue onto an object which can be cast as an appropriate type
/// </summary>
/// <param name="T">The type to which the returned object will be cast</param>
/// <param name="toMap">The IJSONValue to map onto the object</param>
/// <returns>An object of type T containing the JSON information</returns>
public static object MapValue(Type T, IJSONValue toMap)
{
if (toMap is JSONObject)
{
return(MapObject(T, (JSONObject)toMap));
}
else if (toMap is JSONArray)
{
return(MapArray(T, (JSONArray)toMap));
}
else if (toMap is JSONLiteral)
{
return(MapLiteral(T, (JSONLiteral)toMap));
}
else
{
throw new ArgumentException("Cannot map vanilla IJSONValue.");
}
}
/// <summary> /// Give subtypes a chance to recast the loaded value as an <code>IJSONValue</code> /// subtype. Default implementation returns 'null' because no recast is needed. /// /// Subtypes only need to return a default instance. The <code>read()</code> /// method handles copying of data. /// </summary> /// <param name="path">JSON path to the value we're reading</param> /// <param name="value"></param> /// <returns></returns> /// <exception cref="Gavaghan.JSON.JSONException" /> protected virtual IJSONValue Recast(string path, IJSONValue value) => null;
/// <summary>
/// Serialize a IJSONValue into JSON
/// </summary>
/// <param name="toWrite">The IJSONValue to be serialized</param>
/// <returns>A string containing the serialized JSON</returns>
public static string Write(IJSONValue toWrite)
{
return(toWrite.ToJSON());
}
/// <summary>
/// Maps a IJSONValue object onto another object
/// </summary>
/// <typeparam name="T">The type of object to map the IJSONValue onto</typeparam>
/// <param name="toMap">The IJSONValue to map onto the object</param>
/// <returns>An instance of the object containing the JSON information</returns>
public static T Map <T>(IJSONValue toMap)
{
return((T)JSONMap.MapValue(typeof(T), toMap));
}
/// <summary>
/// Look for the 'type' value in a populated <code>JSONObject</code> and create a
/// default instance of it. If 'value' is not a <code>JSONObject</code> or if
/// 'type' value is not found, defer to the super class.
/// </summary>
/// <param name="path">JSON path to the value we're reading</param>
/// <param name="value">the value to possibly recast</param>
/// <returns>the recast value or 'null' if no recast was required</returns>
/// <exception cref="Gavaghan.JSON.JSONException" />
protected override IJSONValue Recast(string path, IJSONValue value)
{
TypedJSONObject retval;
// if it's not a JSONObject, we have nothing to do
if (!(value is JSONObject))
{
return(base.Recast(path, value));
}
// look for a type value
JSONObject valueObj = (JSONObject)value;
valueObj.TryGetValue(TypedJSONObject.TYPE_KEY, out IJSONValue typeValue);
// if no type found, defer to superclass
if (typeValue == null)
{
return(base.Recast(path, value));
}
// ensure typeValue is a string
if (!(typeValue is JSONString))
{
throw new JSONException(path, String.Format("'type' value is a '{0}' but a JSONString was expected", typeValue.GetType().Name));
}
// load the new type
String typeName = ((JSONString)typeValue).StringValue;
Type type = Type.GetType(typeName);
if (type == null)
{
throw new JSONException(path, String.Format("Read a JSON object with type attribute '{0}' but that class could not be found", typeName));
}
// ensure the class is an appropriate subtype
if (!typeof(TypedJSONObject).IsAssignableFrom(type))
{
throw new JSONException(path, String.Format("Read an object of type '{0}' but that class is not assignable to 'TypedJSONObject'", typeName));
}
// instantiate a default instance
try
{
ConstructorInfo ctx = type.GetConstructor(NO_PARAMS);
if (ctx == null)
{
throw new Exception("'" + type.Name + "' does not have a public default constructor");
}
IJSONValue newJSON = (IJSONValue)ctx.Invoke(NO_ARGS);
retval = (TypedJSONObject)newJSON;
}
catch (TargetInvocationException exc)
{
throw new Exception("Constructor for '" + type.Name + "' threw an exception", exc.InnerException);
}
return(retval);
}
/// <summary> /// Copy the value of another IJSONValue into our underlying value. /// </summary> /// <param name="value"></param> /// <returns></returns> public abstract void CopyValue(IJSONValue value);
public void CopyValue(IJSONValue value)
{
throw new NotImplementedException();
}
