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using System.Collections.Generic;
using System.IO;
namespace Google.ProtocolBuffers.ProtoGen {
/// <summary>
/// All the configuration required for the generator - where to generate
/// output files, the location of input files etc. While this isn't immutable
/// in practice, the contents shouldn't be changed after being passed to
/// the generator.
/// </summary>
public sealed class GeneratorOptions {
public string OutputDirectory { get; set; }
public IList<string> InputFiles { get; set; }
/// <summary>
/// Attempts to validate the options, but doesn't throw an exception if they're invalid.
/// Instead, when this method returns false, the output variable will contain a collection
/// of reasons for the validation failure.
/// </summary>
/// <param name="reasons">Variable to receive a list of reasons in case of validation failure.</param>
/// <returns>true if the options are valid; false otherwise</returns>
public bool TryValidate(out IList<string> reasons) {
List<string> tmpReasons = new List<string>();
// Output directory validation
if (string.IsNullOrEmpty(OutputDirectory)) {
tmpReasons.Add("No output directory specified");
} else {
if (!Directory.Exists(OutputDirectory)) {
tmpReasons.Add("Specified output directory (" + OutputDirectory + " doesn't exist.");
}
}
// Input file validation (just in terms of presence)
if (InputFiles == null || InputFiles.Count == 0) {
tmpReasons.Add("No input files specified");
} else {
foreach (string input in InputFiles) {
FileInfo fi = new FileInfo(input);
if (!fi.Exists) {
tmpReasons.Add("Input file " + input + " doesn't exist.");
}
}
}
if (tmpReasons.Count != 0) {
reasons = tmpReasons;
return false;
}
reasons = null;
return true;
}
/// <summary>
/// Validates that all the options have been set and are valid,
/// throwing an exception if they haven't.
/// </summary>
/// <exception cref="InvalidOptionsException">The options are invalid.</exception>
public void Validate() {
IList<string> reasons;
if (!TryValidate(out reasons)) {
throw new InvalidOptionsException(reasons);
}
}
}
}
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