content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to you 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 org.apache.calcite.util;
  
  import org.apache.calcite.runtime.CalciteResource;
  import org.apache.calcite.runtime.ConsList;
  import org.apache.calcite.runtime.Resources;
  
  import java.util.List;
  
  /**
   * Definitions of objects to be statically imported.
   *
   * <h2>Note to developers</h2>
   *
   * <p>Please give careful consideration before including an object in this
   * class. Pros:
   * <ul>
   * <li>Code that uses these objects will be terser.
   * </ul>
   *
   * <p>Cons:
   * <ul>
   * <li>Namespace pollution,
   * <li>code that is difficult to understand (a general problem with static
   * imports),
   * <li>potential cyclic initialization.
   * </ul>
   */
  public abstract class Static {
    private Static() {}
  
    /** Resources. */
    public static final CalciteResource RESOURCE =
        Resources.create(CalciteResource.class);
  
    /** Builds a list. */
    public static <E> List<E> cons(E first, List<? extends E> rest) {
      return ConsList.of(first, rest);
    }
  }
  