core/src/main/java/org/apache/calcite/avatica/AvaticaResultSetMetaData.java

/*
 * 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;

import java.sql.ResultSetMetaData;
import java.sql.SQLException;

/**
 * Implementation of {@link ResultSetMetaData}
 * for the Avatica framework.
 */
public class AvaticaResultSetMetaData implements ResultSetMetaData {
  final AvaticaStatement statement;
  final Object query; // reserved for future use
  final Meta.Signature signature;

  public AvaticaResultSetMetaData(
      AvaticaStatement statement,
      Object query,
      Meta.Signature signature) {
    this.statement = statement;
    this.query = query;
    this.signature = signature;
  }

  private ColumnMetaData getColumnMetaData(int column) {
    return signature.columns.get(column - 1);
  }

  // implement ResultSetMetaData

  public int getColumnCount() throws SQLException {
    return signature.columns.size();
  }

  public boolean isAutoIncrement(int column) throws SQLException {
    return getColumnMetaData(column).autoIncrement;
  }

  public boolean isCaseSensitive(int column) throws SQLException {
    return getColumnMetaData(column).caseSensitive;
  }

  public boolean isSearchable(int column) throws SQLException {
    return getColumnMetaData(column).searchable;
  }

  public boolean isCurrency(int column) throws SQLException {
    return getColumnMetaData(column).currency;
  }

  public int isNullable(int column) throws SQLException {
    return getColumnMetaData(column).nullable;
  }

  public boolean isSigned(int column) throws SQLException {
    return getColumnMetaData(column).signed;
  }

  public int getColumnDisplaySize(int column) throws SQLException {
    return getColumnMetaData(column).displaySize;
  }

  public String getColumnLabel(int column) throws SQLException {
    return getColumnMetaData(column).label;
  }

  public String getColumnName(int column) throws SQLException {
    return getColumnMetaData(column).columnName;
  }

  public String getSchemaName(int column) throws SQLException {
    return getColumnMetaData(column).schemaName;
  }

  public int getPrecision(int column) throws SQLException {
    return getColumnMetaData(column).precision;
  }

  public int getScale(int column) throws SQLException {
    return getColumnMetaData(column).scale;
  }

  public String getTableName(int column) throws SQLException {
    return getColumnMetaData(column).tableName;
  }

  public String getCatalogName(int column) throws SQLException {
    return getColumnMetaData(column).catalogName;
  }

  public int getColumnType(int column) throws SQLException {
    return getColumnMetaData(column).type.id;
  }

  public String getColumnTypeName(int column) throws SQLException {
    return getColumnMetaData(column).type.name;
  }

  public boolean isReadOnly(int column) throws SQLException {
    return getColumnMetaData(column).readOnly;
  }

  public boolean isWritable(int column) throws SQLException {
    return getColumnMetaData(column).writable;
  }

  public boolean isDefinitelyWritable(int column) throws SQLException {
    return getColumnMetaData(column).definitelyWritable;
  }

  public String getColumnClassName(int column) throws SQLException {
    return getColumnMetaData(column).columnClassName;
  }

  // implement Wrapper

  public <T> T unwrap(Class<T> iface) throws SQLException {
    if (iface.isInstance(this)) {
      return iface.cast(this);
    }
    throw statement.connection.HELPER.createException(
        "does not implement '" + iface + "'");
  }

  public boolean isWrapperFor(Class<?> iface) throws SQLException {
    return iface.isInstance(this);
  }
}

// End AvaticaResultSetMetaData.java