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Java Library used to import and/or sync (taking care of changes) data into one or more commercetools projects from external sources such as CSV, XML, JSON, etc.. or even from an already existing commercetools project.

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package com.commercetools.sync.commons.exceptions;

import static java.lang.String.format;
import static org.apache.commons.lang3.StringUtils.isNotBlank;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import javax.annotation.Nonnull;
import org.apache.commons.lang3.StringUtils;

final class ExceptionUtils {
  @Nonnull
  static String buildMessage(
      @Nonnull final String message,
      @Nonnull final Set causes,
      final int causesTabbingDepth) {
    final String causesString = asMessage(causes, causesTabbingDepth);
    return isNotBlank(causesString) ? format("%s %s", message, causesString) : message;
  }

  @Nonnull
  private static String asMessage(@Nonnull final Set causes, final int tabbingDepth) {
    final String tabs = buildTabs(tabbingDepth);
    final List causesMessages =
        causes.stream()
            .map(Throwable::getMessage)
            .filter(StringUtils::isNotBlank)
            .collect(Collectors.toList());
    return !causesMessages.isEmpty() ? buildCausesMessage(tabs, causesMessages) : "";
  }

  @Nonnull
  private static String buildCausesMessage(
      @Nonnull final String tabs, @Nonnull final List causesMessages) {
    return format("Causes:%n%s%s", tabs, joinCauses(tabs, causesMessages));
  }

  @Nonnull
  private static String joinCauses(
      @Nonnull final String tabs, @Nonnull final List causesMessages) {
    return String.join(format("%n%s", tabs), causesMessages);
  }

  @Nonnull
  private static String buildTabs(final int numberOfTabs) {
    return IntStream.range(0, numberOfTabs).mapToObj(index -> "\t").collect(Collectors.joining());
  }

  private ExceptionUtils() {}
}