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Java client for the OpenTripPlanner GraphQL API

There is a newer version: 0.1.9

package org.opentripplanner.client.validation;

import java.util.Collection;
import java.util.Objects;

public class CollectionUtils {
  public static  Collection assertHasValue(Collection coll) {
    Objects.requireNonNull(coll);
    if (coll.isEmpty()) {
      throw new IllegalArgumentException("Collection has no elements.");
    }
    return coll;
  }
}