Statistics.cs

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/*++
Copyright (c) 2012 Microsoft Corporation

Module Name:

    Statistics.cs

Abstract:

    Z3 Managed API: Statistics

Author:

    Christoph Wintersteiger (cwinter) 2012-03-22

Notes:
    
--*/

using System;
using System.Diagnostics.Contracts;

namespace Microsoft.Z3
{
    [ContractVerification(true)]
    public class Statistics : Z3Object
    {
        public class Entry
        {
            readonly public string Key;
            public uint UIntValue { get { return m_uint; } }
            public double DoubleValue { get { return m_double; } }
            public bool IsUInt { get { return m_is_uint; } }
            public bool IsDouble { get { return m_is_double; } }

            public string Value
            {
                get
                {
                    Contract.Ensures(Contract.Result<string>() != null);

                    if (IsUInt)
                        return m_uint.ToString();
                    else if (IsDouble)
                        return m_double.ToString();
                    else
                        throw new Z3Exception("Unknown statistical entry type");
                }
            }

            public override string ToString()
            {
                return Key + ": " + Value;
            }

            #region Internal
            readonly private bool m_is_uint = false;
            readonly private bool m_is_double = false;
            readonly private uint m_uint = 0;
            readonly private double m_double = 0.0;
            internal Entry(string k, uint v)
            {
                Key = k;
                m_is_uint = true;
                m_uint = v;
            }
            internal Entry(string k, double v)
            {
                Key = k;
                m_is_double = true;
                m_double = v;
            }
            #endregion
        }

        public override string ToString()
        {
            return Native.Z3_stats_to_string(Context.nCtx, NativeObject);
        }

        public uint Size
        {
            get { return Native.Z3_stats_size(Context.nCtx, NativeObject); }
        }

        public Entry[] Entries
        {
            get
            {
                Contract.Ensures(Contract.Result<Entry[]>() != null);
                Contract.Ensures(Contract.Result<Entry[]>().Length == this.Size);
                Contract.Ensures(Contract.ForAll(0, Contract.Result<Entry[]>().Length, j => Contract.Result<Entry[]>()[j] != null));

                uint n = Size;
                Entry[] res = new Entry[n];
                for (uint i = 0; i < n; i++)
                {
                    Entry e;
                    string k = Native.Z3_stats_get_key(Context.nCtx, NativeObject, i);
                    if (Native.Z3_stats_is_uint(Context.nCtx, NativeObject, i) != 0)
                        e = new Entry(k, Native.Z3_stats_get_uint_value(Context.nCtx, NativeObject, i));
                    else if (Native.Z3_stats_is_double(Context.nCtx, NativeObject, i) != 0)
                        e = new Entry(k, Native.Z3_stats_get_double_value(Context.nCtx, NativeObject, i));
                    else
                        throw new Z3Exception("Unknown data entry value");
                    res[i] = e;
                }
                return res;
            }
        }

        public string[] Keys
        {
            get
            {
                Contract.Ensures(Contract.Result<string[]>() != null);

                uint n = Size;
                string[] res = new string[n];
                for (uint i = 0; i < n; i++)
                    res[i] = Native.Z3_stats_get_key(Context.nCtx, NativeObject, i);
                return res;
            }
        }

        public Entry this[string key]
        {
            get
            {
                uint n = Size;
                Entry[] es = Entries;
                for (uint i = 0; i < n; i++)
                    if (es[i].Key == key)
                        return es[i];
                return null;
            }
        }

        #region Internal
        internal Statistics(Context ctx, IntPtr obj)
            : base(ctx, obj)
        {
            Contract.Requires(ctx != null);
        }

        internal class DecRefQueue : IDecRefQueue
        {
            public DecRefQueue() : base() { }
            public DecRefQueue(uint move_limit) : base(move_limit) { }
            internal override void IncRef(Context ctx, IntPtr obj)
            {
                Native.Z3_stats_inc_ref(ctx.nCtx, obj);
            }

            internal override void DecRef(Context ctx, IntPtr obj)
            {
                Native.Z3_stats_dec_ref(ctx.nCtx, obj);
            }
        };

        internal override void IncRef(IntPtr o)
        {
            Context.Statistics_DRQ.IncAndClear(Context, o);
            base.IncRef(o);
        }

        internal override void DecRef(IntPtr o)
        {
            Context.Statistics_DRQ.Add(o);
            base.DecRef(o);
        }
        #endregion
    }
}