LogEntry.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;
using System.Collections;
using System.Collections.Generic;

namespace Deveel.Data.Diagnostics {
    public sealed class LogEntry : IEnumerable<KeyValuePair<string, object>> {
        private readonly Dictionary<string, object> data;

        internal LogEntry(IDictionary<string, object> metadata) {
            data = new Dictionary<string, object>(metadata);
        }

        public IEnumerable<string> Keys {
            get { return data.Keys; }
        }

        public object GetValue(string key) {
            object value;
            if (!data.TryGetValue(key, out value))
                return null;

            return value;
        }

        public IEnumerator<KeyValuePair<string, object>> GetEnumerator() {
            return data.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator();
        }

        public static LogEntry FromEvent(IEvent @event) {
            var data = new Dictionary<string, object>();
            if (@event.EventSource != null) {
                var source = @event.EventSource;
                while (source != null) {
                    var sourceData = source.Metadata;
                    foreach (var pair in sourceData) {
                        data[pair.Key] = pair.Value;
                    }

                    source = source.ParentSource;
                }
            }

            foreach (var pair in @event.EventData) {
                data[pair.Key] = pair.Value;
            }

            return new LogEntry(data);
        }
    }
}