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.sql.validate;
  
  import org.apache.calcite.sql.SqlIdentifier;
  import org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.calcite.util.Util;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  import java.util.Objects;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A generic implementation of {@link SqlMoniker}.
   */
  public class SqlMonikerImpl implements SqlMoniker {
    //~ Instance fields --------------------------------------------------------
  
    private final ImmutableList<String> names;
    private final SqlMonikerType type;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a moniker with an array of names.
     */
    public SqlMonikerImpl(List<String> names, SqlMonikerType type) {
      this.names = ImmutableList.copyOf(names);
      this.type = requireNonNull(type, "type");
    }
  
    /**
     * Creates a moniker with a single name.
     */
    public SqlMonikerImpl(String name, SqlMonikerType type) {
      this(ImmutableList.of(name), type);
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public boolean equals(@Nullable Object obj) {
      return this == obj
          || obj instanceof SqlMonikerImpl
          && type == ((SqlMonikerImpl) obj).type
          && names.equals(((SqlMonikerImpl) obj).names);
    }
  
    @Override public int hashCode() {
      return Objects.hash(type, names);
    }
  
    @Override public SqlMonikerType getType() {
      return type;
    }
  
    @Override public List<String> getFullyQualifiedNames() {
      return names;
    }
  
    @Override public SqlIdentifier toIdentifier() {
      return new SqlIdentifier(names, SqlParserPos.ZERO);
    }
  
    @Override public String toString() {
      return Util.sepList(names, ".");
    }
  
    @Override public String id() {
      return type + "(" + this + ")";
    }
  }
  