/*
 * Copyright 2011 Alibaba Group.
 *
 * Licensed 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 com.alibaba.druid.pool;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

/**
 * 
 * @author shaojin.wensj
 *
 */
public class PoolableStatement extends PoolableWrapper implements Statement {
	private final Statement stmt;
	protected PoolableConnection conn;
	protected final List<ResultSet> resultSetTrace = new ArrayList<ResultSet>();

	public PoolableStatement(PoolableConnection conn, Statement stmt) {
		this.conn = conn;
		this.stmt = stmt;
	}

	public PoolableConnection getPoolableConnection() {
		return conn;
	}
	
	public void setPoolableConnection(PoolableConnection conn) {
		this.conn = conn;
	}

	protected void clearResultSet() {
		for (ResultSet rs : resultSetTrace) {
			try {
				if (!rs.isClosed()) {
					rs.close();
				}
			} catch (SQLException ex) {
				ex.printStackTrace(); //
			}
		}
		resultSetTrace.clear();
	}

	@Override
	public final ResultSet executeQuery(String sql) throws SQLException {
		ResultSet rs = stmt.executeQuery(sql);

		PoolableResultSet poolableResultSet = new PoolableResultSet(this, rs);
		resultSetTrace.add(poolableResultSet);
		
		return poolableResultSet;
	}

	@Override
	public final int executeUpdate(String sql) throws SQLException {
		return stmt.executeUpdate(sql);
	}

	@Override
	public void close() throws SQLException {
		clearResultSet();

		stmt.close();
		
		conn.getConnectionHolder().removeTrace(this);
	}

	@Override
	public final int getMaxFieldSize() throws SQLException {
		return stmt.getMaxFieldSize();
	}

	@Override
	public final void setMaxFieldSize(int max) throws SQLException {
		stmt.setMaxFieldSize(max);
	}

	@Override
	public final int getMaxRows() throws SQLException {
		return stmt.getMaxRows();
	}

	@Override
	public final void setMaxRows(int max) throws SQLException {
		stmt.setMaxRows(max);
	}

	@Override
	public final void setEscapeProcessing(boolean enable) throws SQLException {
		stmt.setEscapeProcessing(enable);
	}

	@Override
	public final int getQueryTimeout() throws SQLException {
		return stmt.getQueryTimeout();
	}

	@Override
	public final void setQueryTimeout(int seconds) throws SQLException {
		stmt.setQueryTimeout(seconds);
	}

	@Override
	public final void cancel() throws SQLException {
		stmt.cancel();
	}

	@Override
	public final SQLWarning getWarnings() throws SQLException {
		return stmt.getWarnings();
	}

	@Override
	public final void clearWarnings() throws SQLException {
		stmt.clearWarnings();
	}

	@Override
	public final void setCursorName(String name) throws SQLException {
		stmt.setCursorName(name);
	}

	@Override
	public final boolean execute(String sql) throws SQLException {
		return stmt.execute(sql);
	}

	@Override
	public final ResultSet getResultSet() throws SQLException {
		ResultSet rs = stmt.getResultSet();

		PoolableResultSet poolableResultSet = new PoolableResultSet(this, rs);
		resultSetTrace.add(poolableResultSet);
		
		return poolableResultSet;
	}

	@Override
	public final int getUpdateCount() throws SQLException {
		return stmt.getUpdateCount();
	}

	@Override
	public final boolean getMoreResults() throws SQLException {
		return stmt.getMoreResults();
	}

	@Override
	public final void setFetchDirection(int direction) throws SQLException {
		stmt.setFetchDirection(direction);
	}

	@Override
	public final int getFetchDirection() throws SQLException {
		return stmt.getFetchDirection();
	}

	@Override
	public final void setFetchSize(int rows) throws SQLException {
		stmt.setFetchSize(rows);
	}

	@Override
	public final int getFetchSize() throws SQLException {
		return stmt.getFetchSize();
	}

	@Override
	public final int getResultSetConcurrency() throws SQLException {
		return stmt.getResultSetConcurrency();
	}

	@Override
	public final int getResultSetType() throws SQLException {
		return stmt.getResultSetType();
	}

	@Override
	public final void addBatch(String sql) throws SQLException {
		stmt.addBatch(sql);
	}

	@Override
	public final void clearBatch() throws SQLException {
		stmt.clearBatch();
	}

	@Override
	public final int[] executeBatch() throws SQLException {
		return stmt.executeBatch();
	}

	@Override
	public final Connection getConnection() throws SQLException {
		return conn;
	}

	@Override
	public final boolean getMoreResults(int current) throws SQLException {
		return stmt.getMoreResults(current);
	}

	@Override
	public final ResultSet getGeneratedKeys() throws SQLException {
		ResultSet rs = stmt.getGeneratedKeys();

		PoolableResultSet poolableResultSet = new PoolableResultSet(this, rs);

		resultSetTrace.add(poolableResultSet);

		return poolableResultSet;
	}

	@Override
	public final int executeUpdate(String sql, int autoGeneratedKeys) throws SQLException {
		return stmt.executeUpdate(sql, autoGeneratedKeys);
	}

	@Override
	public final int executeUpdate(String sql, int columnIndexes[]) throws SQLException {
		return stmt.executeUpdate(sql, columnIndexes);
	}

	@Override
	public final int executeUpdate(String sql, String columnNames[]) throws SQLException {
		return stmt.executeUpdate(sql, columnNames);
	}

	@Override
	public final boolean execute(String sql, int autoGeneratedKeys) throws SQLException {
		return stmt.execute(sql, autoGeneratedKeys);
	}

	@Override
	public final boolean execute(String sql, int columnIndexes[]) throws SQLException {
		return stmt.execute(sql, columnIndexes);
	}

	@Override
	public final boolean execute(String sql, String columnNames[]) throws SQLException {
		return stmt.execute(sql, columnNames);
	}

	@Override
	public final int getResultSetHoldability() throws SQLException {
		return stmt.getResultSetHoldability();
	}

	@Override
	public final boolean isClosed() throws SQLException {
		return stmt.isClosed();
	}

	@Override
	public final void setPoolable(boolean poolable) throws SQLException {
		throw new UnsupportedOperationException();
	}

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

    public String toString() {
        return stmt.toString();
    }
}