Log.cs

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/*++
Copyright (c) 2012 Microsoft Corporation

Module Name:

    Log.cs

Abstract:

    Z3 Managed API: Log

Author:

    Christoph Wintersteiger (cwinter) 2012-03-15

Notes:
    
--*/

using System;
using System.Diagnostics.Contracts;

namespace Microsoft.Z3
{
    [ContractVerification(true)]
    public static class Log
    {
        private static bool m_is_open = false;

        public static bool Open(string filename)
        {
            m_is_open = true;
            return Native.Z3_open_log(filename) == 1;
        }

        public static void Close()
        {
            m_is_open = false;
            Native.Z3_close_log();
        }

        public static void Append(string s)
        {
            Contract.Requires(isOpen());

            if (!m_is_open)
                throw new Z3Exception("Log cannot be closed.");
            Native.Z3_append_log(s);
        }

        [Pure]
        public static bool isOpen()
        {
            return m_is_open;
        }
    }
}