/*
 * 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.noop;

import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

/**
 * A {@link Connection} implementation which does nothing.
 */
public class AvaticaNoopConnection implements Connection {

  private static final AvaticaNoopConnection INSTANCE = new AvaticaNoopConnection();

  public static AvaticaNoopConnection getInstance() {
    return INSTANCE;
  }

  private AvaticaNoopConnection() {}

  private UnsupportedOperationException unsupported() {
    return new UnsupportedOperationException("Unsupported");
  }

  @Override public <T> T unwrap(Class<T> iface) throws SQLException {
    throw unsupported();
  }

  @Override public boolean isWrapperFor(Class<?> iface) throws SQLException {
    throw unsupported();
  }

  @Override public Statement createStatement() throws SQLException {
    return AvaticaNoopStatement.getInstance();
  }

  @Override public PreparedStatement prepareStatement(String sql) throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public CallableStatement prepareCall(String sql) throws SQLException {
    throw unsupported();
  }

  @Override public String nativeSQL(String sql) throws SQLException {
    throw unsupported();
  }

  @Override public void setAutoCommit(boolean autoCommit) throws SQLException {}

  @Override public boolean getAutoCommit() throws SQLException {
    return false;
  }

  @Override public void commit() throws SQLException {}

  @Override public void rollback() throws SQLException {}

  @Override public void close() throws SQLException {}

  @Override public boolean isClosed() throws SQLException {
    return true;
  }

  @Override public DatabaseMetaData getMetaData() throws SQLException {
    return AvaticaNoopDatabaseMetaData.getInstance();
  }

  @Override public void setReadOnly(boolean readOnly) throws SQLException {}

  @Override public boolean isReadOnly() throws SQLException {
    return false;
  }

  @Override public void setCatalog(String catalog) throws SQLException {}

  @Override public String getCatalog() throws SQLException {
    return null;
  }

  @Override public void setTransactionIsolation(int level) throws SQLException {}

  @Override public int getTransactionIsolation() throws SQLException {
    return 0;
  }

  @Override public SQLWarning getWarnings() throws SQLException {
    return null;
  }

  @Override public void clearWarnings() throws SQLException {}

  @Override public Statement createStatement(int resultSetType, int resultSetConcurrency)
      throws SQLException {
    return AvaticaNoopStatement.getInstance();
  }

  @Override public PreparedStatement prepareStatement(String sql, int resultSetType,
      int resultSetConcurrency) throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public CallableStatement prepareCall(String sql, int resultSetType,
      int resultSetConcurrency) throws SQLException {
    throw unsupported();
  }

  @Override public Map<String, Class<?>> getTypeMap() throws SQLException {
    return Collections.emptyMap();
  }

  @Override public void setTypeMap(Map<String, Class<?>> map) throws SQLException {}

  @Override public void setHoldability(int holdability) throws SQLException {}

  @Override public int getHoldability() throws SQLException {
    throw unsupported();
  }

  @Override public Savepoint setSavepoint() throws SQLException {
    throw unsupported();
  }

  @Override public Savepoint setSavepoint(String name) throws SQLException {
    throw unsupported();
  }

  @Override public void rollback(Savepoint savepoint) throws SQLException {
    throw unsupported();
  }

  @Override public void releaseSavepoint(Savepoint savepoint) throws SQLException {
    throw unsupported();
  }

  @Override public Statement createStatement(int resultSetType, int resultSetConcurrency,
      int resultSetHoldability) throws SQLException {
    return AvaticaNoopStatement.getInstance();
  }

  @Override public PreparedStatement prepareStatement(String sql, int resultSetType,
      int resultSetConcurrency, int resultSetHoldability) throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public CallableStatement prepareCall(String sql, int resultSetType,
      int resultSetConcurrency, int resultSetHoldability) throws SQLException {
    throw unsupported();
  }

  @Override public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
      throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public PreparedStatement prepareStatement(String sql, int[] columnIndexes)
      throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public PreparedStatement prepareStatement(String sql, String[] columnNames)
      throws SQLException {
    return AvaticaNoopPreparedStatement.getInstance();
  }

  @Override public Clob createClob() throws SQLException {
    throw unsupported();
  }

  @Override public Blob createBlob() throws SQLException {
    throw unsupported();
  }

  @Override public NClob createNClob() throws SQLException {
    throw unsupported();
  }

  @Override public SQLXML createSQLXML() throws SQLException {
    throw unsupported();
  }

  @Override public boolean isValid(int timeout) throws SQLException {
    return true;
  }

  @Override public void setClientInfo(String name, String value) throws SQLClientInfoException {}

  @Override public void setClientInfo(Properties properties) throws SQLClientInfoException {}

  @Override public String getClientInfo(String name) throws SQLException {
    throw unsupported();
  }

  @Override public Properties getClientInfo() throws SQLException {
    throw unsupported();
  }

  @Override public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
    throw unsupported();
  }

  @Override public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
    throw unsupported();
  }

  @Override public void setSchema(String schema) throws SQLException {}

  @Override public String getSchema() throws SQLException {
    return null;
  }

  @Override public void abort(Executor executor) throws SQLException {
    throw unsupported();
  }

  @Override public void setNetworkTimeout(Executor executor, int milliseconds)
      throws SQLException {}

  @Override public int getNetworkTimeout() throws SQLException {
    throw unsupported();
  }

}

// End AvaticaNoopConnection.java