text: package de.mannodermaus.junit5.condition;
  
  import android.annotation.TargetApi;
  
  import org.junit.jupiter.api.extension.ConditionEvaluationResult;
  import org.junit.jupiter.api.extension.ExecutionCondition;
  import org.junit.jupiter.api.extension.ExtensionContext;
  import org.junit.platform.commons.util.Preconditions;
  
  import java.util.Optional;
  
  import static java.lang.String.format;
  import static org.junit.jupiter.api.extension.ConditionEvaluationResult.disabled;
  import static org.junit.jupiter.api.extension.ConditionEvaluationResult.enabled;
  import static org.junit.platform.commons.util.AnnotationUtils.findAnnotation;
  
  class EnabledIfBuildConfigValueCondition implements ExecutionCondition {
  
    private static final ConditionEvaluationResult ENABLED_BY_DEFAULT =
        enabled("@EnabledIfBuildConfigValue is not present");
  
    @TargetApi(24)
    @Override
    public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
      Optional<EnabledIfBuildConfigValue> optional = findAnnotation(context.getElement(), EnabledIfBuildConfigValue.class);
  
      if (optional.isPresent()) {
        EnabledIfBuildConfigValue annotation = optional.get();
        String name = annotation.named().trim();
        String regex = annotation.matches();
        Preconditions.notBlank(name, () -> "The 'named' attribute must not be blank in " + annotation);
        Preconditions.notBlank(regex, () -> "The 'matches' attribute must not be blank in " + annotation);
        String actual = getBuildConfigValue(name);
  
        // Nothing to match against?
        if (actual == null) {
          return disabled(format("BuildConfig key [%s] does not exist", name));
        }
        if (actual.matches(regex)) {
          return enabled(format("BuildConfig key [%s] with value [%s] matches regular expression [%s]",
              name, actual, regex));
        }
        return disabled(format("BuildConfig key [%s] with value [%s] does not match regular expression [%s]",
            name, actual, regex));
      }
  
      return ENABLED_BY_DEFAULT;
    }
  
    protected String getBuildConfigValue(String key) {
      try {
        return BuildConfigValueUtils.getAsString(key);
      } catch (IllegalAccessException ex) {
        return null;
      }
    }
  }
  