List filterDevices()

in src/com/facebook/buck/cli/AdbCommandRunner.java [65:138]
59 lines of code
17 McCabe index (conditional complexity)

  List<IDevice> filterDevices(IDevice[] allDevices,
                              AdbOptions adbOptions,
                              TargetDeviceOptions deviceOptions) {
    if (allDevices.length == 0) {
      console.printBuildFailure("No devices are found.");
      return null;
    }

    List<IDevice> devices = Lists.newArrayList();
    TriState emulatorsOnly = TriState.UNSPECIFIED;
    if (deviceOptions.isEmulatorsOnlyModeEnabled() && adbOptions.isMultiInstallModeEnabled()) {
      emulatorsOnly = TriState.UNSPECIFIED;
    } else if (deviceOptions.isEmulatorsOnlyModeEnabled()) {
      emulatorsOnly = TriState.TRUE;
    } else if (deviceOptions.isRealDevicesOnlyModeEnabled()) {
      emulatorsOnly = TriState.FALSE;
    }

    int onlineDevices = 0;
    for (IDevice device : allDevices) {
      boolean passed = false;
      if (device.isOnline()) {
        onlineDevices++;

        boolean serialMatches = true;
        if (deviceOptions.hasSerialNumber()) {
          serialMatches = device.getSerialNumber().equals(deviceOptions.getSerialNumber());
        }

        boolean deviceTypeMatches;
        if (emulatorsOnly.isSet()) {
          // Only devices of specific type are accepted:
          // either real devices only or emulators only.
          deviceTypeMatches = (emulatorsOnly.asBoolean() == device.isEmulator());
        } else {
          // All online devices match.
          deviceTypeMatches = true;
        }
        passed = serialMatches && deviceTypeMatches;
      }

      if (passed) {
        devices.add(device);
      }
    }

    // Filtered out all devices.
    if (onlineDevices == 0) {
      console.printBuildFailure("No devices are found.");
      return null;
    }

    if (devices.isEmpty()) {
      console.printBuildFailure(String.format(
          "Found %d connected device(s), but none of them matches specified filter.", onlineDevices
      ));
      return null;
    }

    // Found multiple devices but multi-install mode is not enabled.
    if (!adbOptions.isMultiInstallModeEnabled() && devices.size() > 1) {
      console.printBuildFailure(
          String.format("%d device(s) matches specified device filter (1 expected).\n" +
                        "Either disconnect other devices or enable multi-install mode (%s).",
                         devices.size(), AdbOptions.MULTI_INSTALL_MODE_SHORT_ARG));
      return null;
    }

    // Report if multiple devices are matching the filter.
    if (devices.size() > 1) {
      console.getStdOut().printf("Found " + devices.size() + " matching devices.\n");
    }
    return devices;
  }