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.schema.impl;
  
  import org.apache.calcite.linq4j.AbstractQueryable;
  import org.apache.calcite.linq4j.Linq4j;
  import org.apache.calcite.linq4j.QueryProvider;
  import org.apache.calcite.linq4j.Queryable;
  import org.apache.calcite.linq4j.tree.Expression;
  import org.apache.calcite.schema.QueryableTable;
  import org.apache.calcite.schema.SchemaPlus;
  
  import java.lang.reflect.Type;
  import java.util.Iterator;
  
  /**
   * Abstract implementation of {@link org.apache.calcite.linq4j.Queryable} for
   * {@link QueryableTable}.
   *
   * <p>Not to be confused with
   * {@link org.apache.calcite.adapter.java.AbstractQueryableTable}.
   *
   * @param <T> element type
   */
  public abstract class AbstractTableQueryable<T> extends AbstractQueryable<T> {
    public final QueryProvider queryProvider;
    public final SchemaPlus schema;
    public final QueryableTable table;
    public final String tableName;
  
    protected AbstractTableQueryable(QueryProvider queryProvider,
        SchemaPlus schema, QueryableTable table, String tableName) {
      this.queryProvider = queryProvider;
      this.schema = schema;
      this.table = table;
      this.tableName = tableName;
    }
  
    @Override public Expression getExpression() {
      return table.getExpression(schema, tableName, Queryable.class);
    }
  
    @Override public QueryProvider getProvider() {
      return queryProvider;
    }
  
    @Override public Type getElementType() {
      return table.getElementType();
    }
  
    @Override public Iterator<T> iterator() {
      return Linq4j.enumeratorIterator(enumerator());
    }
  }
  