/*
 *  Copyright 2004 Clinton Begin
 *
 *  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.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.RequestScope;
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 {

  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(RequestScope request, 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(RequestScope request, 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(RequestScope request, 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;
    }
  }

}