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Extension to configure the Endpoints Framework via Guice.

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/*
 * Copyright 2017 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.api.server.spi.guice;

/**
 * Rather than shading all of Guava into an endpoints-framework-guice-all artifact, we include the
 * necessary functionality in this small helper class to remove the dependency.
 */
final class Preconditions {
  static  T checkNotNull(T ref, String errorMessage) {
    if (ref == null) {
      throw new NullPointerException(errorMessage);
    }
    return ref;
  }
}