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public class Item {
  private final Map<String, Set<String>> attributes;
  public Item(Map<String, Set<String>> attributes) {
    this.attributes = attributes;
  }

  public boolean attributeExists(String attributeName) {
    return attributes.containsKey(attributeName);
  }

  public Set<String> values(String attributeName) {
    return attributes.get(attributeName);
  }

  public String getSingleValue(String attributeName) {
    return values(attributeName).iterator().next();
  }
}