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/*
 *  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.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.scope.StatementScope;

import java.util.HashMap;
import java.util.Map;

/**
 * DataExchange implementation for Map objects
 */
public class MapDataExchange extends BaseDataExchange implements DataExchange {

  protected MapDataExchange(DataExchangeFactory dataExchangeFactory) {
    super(dataExchangeFactory);
  }

  public void initialize(Map properties) {
  }

  public Object[] getData(StatementScope statementScope, ParameterMap parameterMap, Object parameterObject) {
    if (!(parameterObject instanceof Map)) {
      throw new RuntimeException("Error.  Object passed into MapDataExchange was not an instance of Map.");
    }

    Object[] data = new Object[parameterMap.getParameterMappings().length];
    Map map = (Map) parameterObject;
    ParameterMapping[] mappings = parameterMap.getParameterMappings();
    for (int i = 0; i < mappings.length; i++) {
      data[i] = map.get(mappings[i].getPropertyName());
    }
    return data;
  }

  public Object setData(StatementScope statementScope, ResultMap resultMap, Object resultObject, Object[] values) {
    if (!(resultObject == null || resultObject instanceof Map)) {
      throw new RuntimeException("Error.  Object passed into MapDataExchange was not an instance of Map.");
    }

    Map map = (Map) resultObject;
    if (map == null) {
      map = new HashMap();
    }

    ResultMapping[] mappings = resultMap.getResultMappings();
    for (int i = 0; i < mappings.length; i++) {
      map.put(mappings[i].getPropertyName(), values[i]);
    }

    return map;
  }

  public Object setData(StatementScope statementScope, ParameterMap parameterMap, Object parameterObject, Object[] values) {
    if (!(parameterObject == null || parameterObject instanceof Map)) {
      throw new RuntimeException("Error.  Object passed into MapDataExchange was not an instance of Map.");
    }

    Map map = (Map) parameterObject;
    if (map == null) {
      map = new HashMap();
    }

    ParameterMapping[] mappings = parameterMap.getParameterMappings();
    for (int i = 0; i < mappings.length; i++) {
      if (mappings[i].isOutputAllowed()) {
        map.put(mappings[i].getPropertyName(), values[i]);
      }
    }

    return map;
  }

}