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.sql.type.SqlTypeExplicitPrecedenceList;
  import org.apache.calcite.sql.type.SqlTypeFamily;
  import org.apache.calcite.sql.type.SqlTypeName;
  import org.apache.calcite.util.Pair;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * Implementation of {@link RelDataType} for a dynamic table.
   *
   * <p>It's used during SQL validation, where the field list is mutable for
   * the getField() call. After SQL validation, a normal {@link RelDataTypeImpl}
   * with an immutable field list takes the place of the DynamicRecordTypeImpl
   * instance.
   */
  public class DynamicRecordTypeImpl extends DynamicRecordType {
    private final RelDataTypeHolder holder;
  
    /** Creates a DynamicRecordTypeImpl. */
    @SuppressWarnings("method.invocation.invalid")
    public DynamicRecordTypeImpl(RelDataTypeFactory typeFactory) {
      this.holder = new RelDataTypeHolder(typeFactory);
      computeDigest();
    }
  
    @Override public List<RelDataTypeField> getFieldList() {
      return holder.getFieldList();
    }
  
    @Override public int getFieldCount() {
      return holder.getFieldCount();
    }
  
    @Override public @Nullable RelDataTypeField getField(String fieldName,
        boolean caseSensitive, boolean elideRecord) {
      final Pair<RelDataTypeField, Boolean> pair =
          holder.getFieldOrInsert(fieldName, caseSensitive);
      // If a new field is added, we should re-compute the digest.
      if (pair.right) {
        computeDigest();
      }
  
      return pair.left;
    }
  
    @Override public List<String> getFieldNames() {
      return holder.getFieldNames();
    }
  
    @Override public SqlTypeName getSqlTypeName() {
      return SqlTypeName.ROW;
    }
  
    @Override public RelDataTypePrecedenceList getPrecedenceList() {
      return new SqlTypeExplicitPrecedenceList(ImmutableList.of());
    }
  
    @Override protected void generateTypeString(StringBuilder sb, boolean withDetail) {
      sb.append("(DynamicRecordRow").append(getFieldNames()).append(")");
    }
  
    @Override public boolean isStruct() {
      return true;
    }
  
    @Override public RelDataTypeFamily getFamily() {
      SqlTypeFamily family = getSqlTypeName().getFamily();
      return family != null ? family : this;
    }
  
  }
  