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.avatica.util;
  
  import org.apache.calcite.avatica.ColumnMetaData;
  
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Struct;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  /** Implementation of JDBC {@link Struct}. */
  public class StructImpl implements Struct {
    private final List list;
  
    public StructImpl(List list) {
      this.list = list;
    }
  
    @Override public String toString() {
      final Iterator iterator = list.iterator();
      if (!iterator.hasNext()) {
        return "{}";
      }
      final StringBuilder buf = new StringBuilder("{");
      for (;;) {
        append(buf, iterator.next());
        if (!iterator.hasNext()) {
          return buf.append("}").toString();
        }
        buf.append(", ");
      }
    }
  
    @Override public String getSQLTypeName() throws SQLException {
      return "ROW";
    }
  
    @Override public Object[] getAttributes() throws SQLException {
      return list.toArray();
    }
  
    @Override public Object[] getAttributes(Map<String, Class<?>> map)
        throws SQLException {
      throw new UnsupportedOperationException(); // TODO
    }
  
    private void append(StringBuilder buf, Object o) {
      if (o == null) {
        buf.append("null");
      } else {
        buf.append(o);
      }
    }
  
    /** Factory that can create a result set based on a list of values. */
    public interface Factory {
      ResultSet create(ColumnMetaData.AvaticaType elementType,
          Iterable<Object> iterable);
    }
  }
  
  // End StructImpl.java
  