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The mybatis data mapper framework makes it easier to use a relational database with object-oriented applications. mybatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the mybatis data mapper over object relational mapping tools.

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/*
 * Copyright 2004-2022 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
 *
 *    https://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.ibatis.sqlmap.engine.exchange;

import com.ibatis.common.beans.Probe;
import com.ibatis.common.beans.ProbeFactory;
import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMap;
import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMapping;
import com.ibatis.sqlmap.engine.mapping.result.ResultMap;
import com.ibatis.sqlmap.engine.mapping.result.ResultMapping;
import com.ibatis.sqlmap.engine.mapping.result.ResultObjectFactoryUtil;
import com.ibatis.sqlmap.engine.scope.StatementScope;
import com.ibatis.sqlmap.engine.type.TypeHandlerFactory;

import java.util.Map;

/**
 * A DataExchange implemtation for working with beans.
 */
public class ComplexDataExchange extends BaseDataExchange implements DataExchange {

  /** The Constant PROBE. */
  private static final Probe PROBE = ProbeFactory.getProbe();

  /**
   * Constructor for the factory.
   *
   * @param dataExchangeFactory
   *          - the factory
   */
  public ComplexDataExchange(DataExchangeFactory dataExchangeFactory) {
    super(dataExchangeFactory);
  }

  public void initialize(Map properties) {
  }

  public Object[] getData(StatementScope statementScope, ParameterMap parameterMap, Object parameterObject) {
    TypeHandlerFactory typeHandlerFactory = getDataExchangeFactory().getTypeHandlerFactory();
    if (parameterObject == null) {
      return new Object[1];
    } else {
      if (typeHandlerFactory.hasTypeHandler(parameterObject.getClass())) {
        ParameterMapping[] mappings = parameterMap.getParameterMappings();
        Object[] data = new Object[mappings.length];
        for (int i = 0; i < mappings.length; i++) {
          data[i] = parameterObject;
        }
        return data;
      } else {
        Object[] data = new Object[parameterMap.getParameterMappings().length];
        ParameterMapping[] mappings = parameterMap.getParameterMappings();
        for (int i = 0; i < mappings.length; i++) {
          data[i] = PROBE.getObject(parameterObject, mappings[i].getPropertyName());
        }
        return data;
      }
    }
  }

  public Object setData(StatementScope statementScope, ResultMap resultMap, Object resultObject, Object[] values) {
    TypeHandlerFactory typeHandlerFactory = getDataExchangeFactory().getTypeHandlerFactory();
    if (typeHandlerFactory.hasTypeHandler(resultMap.getResultClass())) {
      return values[0];
    } else {
      Object object = resultObject;
      if (object == null) {
        try {
          object = ResultObjectFactoryUtil.createObjectThroughFactory(resultMap.getResultClass());
        } catch (Exception e) {
          throw new RuntimeException("JavaBeansDataExchange could not instantiate result class.  Cause: " + e, e);
        }
      }
      ResultMapping[] mappings = resultMap.getResultMappings();
      for (int i = 0; i < mappings.length; i++) {
        PROBE.setObject(object, mappings[i].getPropertyName(), values[i]);
      }
      return object;
    }
  }

  public Object setData(StatementScope statementScope, ParameterMap parameterMap, Object parameterObject,
      Object[] values) {
    TypeHandlerFactory typeHandlerFactory = getDataExchangeFactory().getTypeHandlerFactory();
    if (typeHandlerFactory.hasTypeHandler(parameterMap.getParameterClass())) {
      return values[0];
    } else {
      Object object = parameterObject;
      if (object == null) {
        try {
          object = ResultObjectFactoryUtil.createObjectThroughFactory(parameterMap.getParameterClass());
        } catch (Exception e) {
          throw new RuntimeException("JavaBeansDataExchange could not instantiate result class.  Cause: " + e, e);
        }
      }
      ParameterMapping[] mappings = parameterMap.getParameterMappings();
      for (int i = 0; i < mappings.length; i++) {
        if (mappings[i].isOutputAllowed()) {
          PROBE.setObject(object, mappings[i].getPropertyName(), values[i]);
        }
      }
      return object;
    }
  }

}