/// <summary>
/// Reads the schema according to this header data.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="position">The position.</param>
/// <param name="hdr">The header.</param>
/// <param name="schema">The schema.</param>
/// <param name="marsh">The marshaller.</param>
/// <returns>
/// Schema.
/// </returns>
public static BinaryObjectSchemaField[] ReadSchema(IBinaryStream stream, int position, BinaryObjectHeader hdr,
BinaryObjectSchema schema, Marshaller marsh)
{
Debug.Assert(stream != null);
Debug.Assert(schema != null);
Debug.Assert(marsh != null);
return ReadSchema(stream, position, hdr, () => GetFieldIds(hdr, schema, marsh));
}
/// <summary>
/// Writes collected schema to the stream and pops it.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="schemaOffset">The schema offset.</param>
/// <param name="schemaId">The schema identifier.</param>
/// <param name="flags">Flags according to offset sizes.</param>
/// <returns>
/// True if current schema was non empty; false otherwise.
/// </returns>
public bool WriteSchema(IBinaryStream stream, int schemaOffset, out int schemaId,
ref BinaryObjectHeader.Flag flags)
{
schemaId = Fnv1Hash.Basis;
var count = _idx - schemaOffset;
if (count == 0)
return false;
flags |= BinaryObjectSchemaSerializer.WriteSchema(_fields, stream, schemaOffset, count,
(flags & BinaryObjectHeader.Flag.CompactFooter) == BinaryObjectHeader.Flag.CompactFooter);
for (var i = schemaOffset; i < _idx; i++)
schemaId = Fnv1Hash.Update(schemaId, _fields[i].Id);
return true;
}
/// <summary>
/// Reads the schema according to this header data.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="position">The position.</param>
/// <param name="hdr">The header.</param>
/// <param name="fieldIdsFunc">The field ids function.</param>
/// <returns>
/// Schema.
/// </returns>
public static BinaryObjectSchemaField[] ReadSchema(IBinaryStream stream, int position, BinaryObjectHeader hdr,
Func<int[]> fieldIdsFunc)
{
Debug.Assert(stream != null);
Debug.Assert(fieldIdsFunc != null);
var schemaSize = hdr.SchemaFieldCount;
if (schemaSize == 0)
return null;
stream.Seek(position + hdr.SchemaOffset, SeekOrigin.Begin);
var res = new BinaryObjectSchemaField[schemaSize];
var offsetSize = hdr.SchemaFieldOffsetSize;
if (hdr.IsCompactFooter)
{
var fieldIds = fieldIdsFunc();
Debug.Assert(fieldIds.Length == schemaSize);
if (offsetSize == 1)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadByte());
}
else if (offsetSize == 2)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadShort());
}
else
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadInt());
}
}
else
{
if (offsetSize == 1)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadByte());
}
else if (offsetSize == 2)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadShort());
}
else
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadInt());
}
}
return res;
}
/// <summary>
/// Gets the field ids.
/// </summary>
private static int[] GetFieldIds(BinaryObjectHeader hdr, BinaryObjectSchema schema, Marshaller marsh)
{
var fieldIds = schema.Get(hdr.SchemaId);
if (fieldIds == null)
{
if (marsh.Ignite != null)
fieldIds = marsh.Ignite.ClusterGroup.GetSchema(hdr.TypeId, hdr.SchemaId);
if (fieldIds == null)
throw new BinaryObjectException("Cannot find schema for object with compact footer [" +
"typeId=" + hdr.TypeId + ", schemaId=" + hdr.SchemaId + ']');
}
return fieldIds;
}
