/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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 org.apache.ibatis.logging.jdbc;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  import java.sql.ResultSet;
  import java.sql.Statement;
  
  import org.apache.ibatis.logging.Log;
  import org.apache.ibatis.reflection.ExceptionUtil;
  
  /**
   * Statement proxy to add logging.
   *
   * @author Clinton Begin
   * @author Eduardo Macarron
   *
   */
  public final class StatementLogger extends BaseJdbcLogger implements InvocationHandler {
  
    private final Statement statement;
  
    private StatementLogger(Statement stmt, Log statementLog, int queryStack) {
      super(statementLog, queryStack);
      this.statement = stmt;
    }
  
    @Override
    public Object invoke(Object proxy, Method method, Object[] params) throws Throwable {
      try {
        if (Object.class.equals(method.getDeclaringClass())) {
          return method.invoke(this, params);
        }
        if (EXECUTE_METHODS.contains(method.getName())) {
          if (isDebugEnabled()) {
            debug(" Executing: " + removeExtraWhitespace((String) params[0]), true);
          }
          if ("executeQuery".equals(method.getName())) {
            ResultSet rs = (ResultSet) method.invoke(statement, params);
            return rs == null ? null : ResultSetLogger.newInstance(rs, statementLog, queryStack);
          } else {
            return method.invoke(statement, params);
          }
        } else if ("getResultSet".equals(method.getName())) {
          ResultSet rs = (ResultSet) method.invoke(statement, params);
          return rs == null ? null : ResultSetLogger.newInstance(rs, statementLog, queryStack);
        } else {
          return method.invoke(statement, params);
        }
      } catch (Throwable t) {
        throw ExceptionUtil.unwrapThrowable(t);
      }
    }
  
    /**
     * Creates a logging version of a Statement.
     *
     * @param stmt
     *          the statement
     * @param statementLog
     *          the statement log
     * @param queryStack
     *          the query stack
     * @return the proxy
     */
    public static Statement newInstance(Statement stmt, Log statementLog, int queryStack) {
      InvocationHandler handler = new StatementLogger(stmt, statementLog, queryStack);
      ClassLoader cl = Statement.class.getClassLoader();
      return (Statement) Proxy.newProxyInstance(cl, new Class[]{Statement.class}, handler);
    }
  
    /**
     * return the wrapped statement.
     *
     * @return the statement
     */
    public Statement getStatement() {
      return statement;
    }
  
  }