/// <summary>
/// Static function to return a new instance of the named schema
/// </summary>
/// <param name="jo">JSON object of the named schema</param>
/// <param name="names">list of named schemas already read</param>
/// <param name="encspace">enclosing namespace of the named schema</param>
/// <returns></returns>
internal static NamedSchema NewInstance(JObject jo, PropertyMap props, SchemaNames names, string encspace)
{
string type = JsonHelper.GetRequiredString(jo, "type");
switch (type)
{
case "fixed":
return(FixedSchema.NewInstance(jo, props, names, encspace));
case "enum":
return(EnumSchema.NewInstance(jo, props, names, encspace));
case "record":
return(RecordSchema.NewInstance(Type.Record, jo, props, names, encspace));
case "error":
return(RecordSchema.NewInstance(Type.Error, jo, props, names, encspace));
default:
NamedSchema result;
if (names.TryGetValue(type, null, encspace, out result))
{
return(result);
}
return(null);
}
}
/// <summary>
/// Compares two fixed schemas
/// </summary>
/// <param name="obj">fixed schema to compare against this schema</param>
/// <returns>true if two schemas are the same, false otherwise</returns>
public override bool Equals(object obj)
{
if (obj == this)
{
return(true);
}
if (obj != null && obj is FixedSchema)
{
FixedSchema that = obj as FixedSchema;
return(SchemaName.Equals(that.SchemaName) && Size == that.Size && areEqual(that.Props, this.Props));
}
return(false);
}
/// <summary>
/// Checks if this schema can read data written by the given schema. Used for decoding data.
/// </summary>
/// <param name="writerSchema">writer schema</param>
/// <returns>true if this and writer schema are compatible based on the AVRO specification, false otherwise</returns>
public override bool CanRead(Schema writerSchema)
{
if (writerSchema.Tag != Tag)
{
return(false);
}
FixedSchema that = writerSchema as FixedSchema;
if (that.Size != Size)
{
return(false);
}
if (that.SchemaName.Equals(SchemaName))
{
return(true);
}
else
{
return(InAliases(that.SchemaName));
}
}
private static StringBuilder Build(IDictionary <string, string> env, Schema s, StringBuilder o)
{
bool firstTime = true;
Schema.Type st = s.Tag;
switch (st)
{
case Schema.Type.Union:
UnionSchema us = s as UnionSchema;
o.Append('[');
foreach (Schema b in us.Schemas)
{
if (!firstTime)
{
o.Append(",");
}
else
{
firstTime = false;
}
Build(env, b, o);
}
return(o.Append(']'));
case Schema.Type.Array:
case Schema.Type.Map:
o.Append("{\"type\":\"").Append(Schema.GetTypeString(s.Tag)).Append("\"");
if (st == Schema.Type.Array)
{
ArraySchema arraySchema = s as ArraySchema;
Build(env, arraySchema.ItemSchema, o.Append(",\"items\":"));
}
else
{
MapSchema mapSchema = s as MapSchema;
Build(env, mapSchema.ValueSchema, o.Append(",\"values\":"));
}
return(o.Append("}"));
case Schema.Type.Enumeration:
case Schema.Type.Fixed:
case Schema.Type.Record:
NamedSchema namedSchema = s as NamedSchema;
var name = namedSchema.Fullname;
if (env.ContainsKey(name))
{
return(o.Append(env[name]));
}
var qname = "\"" + name + "\"";
env.Add(name, qname);
o.Append("{\"name\":").Append(qname);
o.Append(",\"type\":\"").Append(Schema.GetTypeString(s.Tag)).Append("\"");
if (st == Schema.Type.Enumeration)
{
EnumSchema enumSchema = s as EnumSchema;
o.Append(",\"symbols\":[");
foreach (var enumSymbol in enumSchema.Symbols)
{
if (!firstTime)
{
o.Append(",");
}
else
{
firstTime = false;
}
o.Append("\"").Append(enumSymbol).Append("\"");
}
o.Append("]");
}
else if (st == Schema.Type.Fixed)
{
FixedSchema fixedSchema = s as FixedSchema;
o.Append(",\"size\":").Append(fixedSchema.Size.ToString());
}
else // st == Schema.Type.Record
{
RecordSchema recordSchema = s as RecordSchema;
o.Append(",\"fields\":[");
foreach (var field in recordSchema.Fields)
{
if (!firstTime)
{
o.Append(",");
}
else
{
firstTime = false;
}
o.Append("{\"name\":\"").Append(field.Name).Append("\"");
Build(env, field.Schema, o.Append(",\"type\":")).Append("}");
}
o.Append("]");
}
return(o.Append("}"));
default: //boolean, bytes, double, float, int, long, null, string
return(o.Append("\"").Append(s.Name).Append("\""));
}
}
