static byte[] ToBinary(ExpressionBlock expr)
{
using (var writer = PersistWriter.Create()) {
writer.Write(expr);
return(writer.ToArray());
}
}
public PersistWriter Writer(string name)
{
var path = Path.Combine(_basepath, name + "." + VariableExtension);
var bw = new BinaryWriter(File.Open(path, FileMode.Create));
return(PersistWriter.Create(bw));
}
// shorthand to serialise a heading
public static byte[] ToBinary(DataHeading heading)
{
using (var writer = PersistWriter.Create()) {
writer.Write(heading);
return(writer.ToArray());
}
}
// shorthand to serialise a value of known type
// must include type to know column order
public static byte[] ToBinary(TypedValue value)
{
using (var writer = PersistWriter.Create()) {
writer.WriteValue(value);
return(writer.ToArray());
}
}
// Store typed value on memory stream, return byte array
public byte[] Store(TypedValue value)
{
using (var writer = new BinaryWriter(new MemoryStream())) {
var w = PersistWriter.Create(writer);
w.Store(value);
return((writer.BaseStream as MemoryStream).ToArray());
}
}
// Store typed value on file stream
public void Store(string name, TypedValue value)
{
var path = Path.Combine(_basepath, name + "." + VariableExtension);
Logger.WriteLine(3, "Storing {0} {1}", name, value);
try {
using (var writer = new BinaryWriter(File.Open(path, FileMode.Create))) {
var w = PersistWriter.Create(writer);
w.Store(value);
}
} catch (Exception ex) {
throw ProgramError.Fatal("Storage", "cannot store '{0}' : {1}", name, ex.Message);
}
}
// persist a catalog entry
public byte[] ToBinary()
{
using (var writer = PersistWriter.Create()) {
writer.Write(Name);
writer.Write((byte)Kind);
writer.Write((byte)Flags);
writer.Write(DataType);
if (IsDatabase)
{
writer.WriteValue(RelationValue.Create(DataTableLocal.Create(Value.Heading)));
}
else if (Kind != EntryKinds.Type)
{
writer.WriteValue(Value);
}
return(writer.ToArray());
}
}
public static PersistWriter Create()
{
return(PersistWriter.Create(new BinaryWriter(new MemoryStream())));
}