PropertiesConfigFormatter.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;
using System.Globalization;
using System.IO;

using Deveel.Data.Util;

namespace Deveel.Data.Configuration {
    public sealed class PropertiesConfigFormatter : IConfigFormatter {
        private void SetValue(IConfiguration config, string propKey, string value) {
            config.SetValue(propKey, value);
        }

        private object ConvertValueTo(string value, Type valueType) {
            return Convert.ChangeType(value, valueType, CultureInfo.InvariantCulture);
        }

        public void LoadInto(IConfiguration config, Stream inputStream) {
            if (inputStream == null)
                throw new ArgumentNullException("inputStream");

            try {
                var properties = new Properties();
                properties.Load(inputStream);

                foreach (var entry in properties) {
                    var propKey = (string) entry.Key;
                    SetValue(config, propKey, (string) entry.Value);
                }
            } catch (DatabaseConfigurationException) {
                throw;
            } catch (Exception ex) {
                throw new DatabaseConfigurationException("Could not load properties from the given stream.", ex);
            }
        }

        public void SaveFrom(IConfiguration config, ConfigurationLevel level, Stream outputStream) {
            try {
                var keys = config.GetKeys(level);
                var properties = new Properties();

                foreach (var configKey in keys) {
                    var configValue = config.GetValue(configKey);
                    if (configValue != null) {
                        var stringValue = Convert.ToString(configValue, CultureInfo.InvariantCulture);
                        properties.SetProperty(configKey, stringValue);
                    }
                }

                properties.Store(outputStream, String.Empty);
            } catch (DatabaseConfigurationException) {
                throw;
            } catch (Exception ex) {
                throw new DatabaseConfigurationException("Could not save the configurations to the given stream.", ex);
            }
        }
    }
}