grpc-swift/Packages/QuickProto/Sources/FileDescriptor.swift

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 *
 * Copyright 2016, Google Inc.
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 *
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 * copyright notice, this list of conditions and the following disclaimer
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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import Foundation

/// A collection of descriptors that were read from a compiled .proto file
class FileDescriptor {
  var messageDescriptors : [MessageDescriptor] = []

  // the base FileDescriptor is the FileDescriptor for FileDescriptor
  init() {
    for description in _FileDescriptor {
      messageDescriptors.append(MessageDescriptor(description:description))
    }
  }

  // creates a FileDescriptor from a FileDescriptor proto
  init(message:Message) {
    message.forEachField(["message_type"]) { (field) in
      let messageDescriptor = MessageDescriptor(message: field.message())
      messageDescriptors.append(messageDescriptor)
    }
  }

  // finds and returns a descriptor for a specified message
  func messageDescriptor(name: String) -> MessageDescriptor? {
    for messageDescriptor in messageDescriptors {
      if messageDescriptor.name == name {
        return messageDescriptor
      } else {
        for nestedMessageDescriptor in messageDescriptor.nestedTypes {
          if nestedMessageDescriptor.name == name {
            return nestedMessageDescriptor
          }
        }

      }
    }
    return nil
  }
}