/// <summary>
/// Resolve the given placeholder using the given name value collection,
/// performing an environment variables check according to the given mode.
/// </summary>
/// <remarks>
/// <p>
/// The default implementation delegates to
/// <see cref="ResolvePlaceholder(string, NameValueCollection)"/>
/// before/afer the environment variable check. Subclasses can override
/// this for custom resolution strategies, including customized points
/// for the environment properties check.
/// </p>
/// </remarks>
/// <param name="placeholder">The placeholder to resolve</param>
/// <param name="props">
/// The merged name value collection of this configurer.
/// </param>
/// <param name="mode">The environment variable mode.</param>
/// <returns>
/// The resolved value or <see langword="null"/> if none.
/// </returns>
/// <seelso cref="Spring.Objects.Factory.Config.EnvironmentVariableMode"/>
protected virtual string ResolvePlaceholder(string placeholder,
NameValueCollection props,
EnvironmentVariableMode mode)
{
string propertyValue = null;
if (mode == Spring.Objects.Factory.Config.EnvironmentVariableMode.Override)
{
propertyValue = Environment.GetEnvironmentVariable(placeholder);
}
if (propertyValue == null)
{
propertyValue = ResolvePlaceholder(placeholder, props);
}
if (propertyValue == null &&
mode == Spring.Objects.Factory.Config.EnvironmentVariableMode.Fallback)
{
propertyValue = Environment.GetEnvironmentVariable(placeholder);
}
return(propertyValue);
}
/// <summary>
/// Resolve the given placeholder using the given name value collection,
/// performing an environment variables check according to the given mode.
/// </summary>
/// <remarks>
/// <p>
/// The default implementation delegates to
/// <see cref="ResolvePlaceholder(string, NameValueCollection)"/>
/// before/afer the environment variable check. Subclasses can override
/// this for custom resolution strategies, including customized points
/// for the environment properties check.
/// </p>
/// </remarks>
/// <param name="placeholder">The placeholder to resolve</param>
/// <param name="props">
/// The merged name value collection of this configurer.
/// </param>
/// <param name="mode">The environment variable mode.</param>
/// <returns>
/// The resolved value or <see langword="null"/> if none.
/// </returns>
/// <seelso cref="Spring.Objects.Factory.Config.EnvironmentVariableMode"/>
protected virtual string ResolvePlaceholder(string placeholder,
NameValueCollection props,
EnvironmentVariableMode mode)
{
string propertyValue = null;
if (mode == Spring.Objects.Factory.Config.EnvironmentVariableMode.Override)
{
propertyValue = Environment.GetEnvironmentVariable(placeholder);
}
if (propertyValue == null)
{
propertyValue = ResolvePlaceholder(placeholder, props);
}
if (propertyValue == null
&& mode == Spring.Objects.Factory.Config.EnvironmentVariableMode.Fallback)
{
propertyValue = Environment.GetEnvironmentVariable(placeholder);
}
return propertyValue;
}
