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.rel.type;
  
  import org.apache.calcite.linq4j.Ord;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  
  /**
   * Type of the cartesian product of two or more sets of records.
   *
   * <p>Its fields are those of its constituent records, but unlike a
   * {@link RelRecordType}, those fields' names are not necessarily distinct.
   */
  public class RelCrossType extends RelDataTypeImpl {
    //~ Instance fields --------------------------------------------------------
  
    private final ImmutableList<RelDataType> types;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a cartesian product type. This should only be called from a
     * factory method.
     */
    @SuppressWarnings("method.invocation.invalid")
    public RelCrossType(
        List<RelDataType> types,
        List<RelDataTypeField> fields) {
      super(fields);
      this.types = ImmutableList.copyOf(types);
      assert types.size() >= 1;
      for (RelDataType type : types) {
        assert !(type instanceof RelCrossType);
      }
      computeDigest();
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public boolean isStruct() {
      return false;
    }
  
    /**
     * Returns the contained types.
     *
     * @return data types.
     */
    public List<RelDataType> getTypes() {
      return types;
    }
  
    @Override protected void generateTypeString(StringBuilder sb, boolean withDetail) {
      sb.append("CrossType(");
      for (Ord<RelDataType> type : Ord.zip(types)) {
        if (type.i > 0) {
          sb.append(", ");
        }
        if (withDetail) {
          sb.append(type.e.getFullTypeString());
        } else {
          sb.append(type.e.toString());
        }
      }
      sb.append(")");
    }
  }
  