/*
 *  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.cache.CacheKey;
import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMap;
import com.ibatis.sqlmap.engine.scope.RequestScope;

/**
 * Base implementation for the DataExchange interface
 */
public abstract class BaseDataExchange implements DataExchange {

  private DataExchangeFactory dataExchangeFactory;

  protected BaseDataExchange(DataExchangeFactory dataExchangeFactory) {
    this.dataExchangeFactory = dataExchangeFactory;
  }

  public CacheKey getCacheKey(RequestScope request, ParameterMap parameterMap, Object parameterObject) {
    CacheKey key = new CacheKey();
    Object[] data = getData(request, parameterMap, parameterObject);
    for (int i = 0; i < data.length; i++) {
      if (data[i] != null) {
        key.update(data[i]);
      }
    }
    return key;
  }

  /**
   * Getter for the factory that created this object
   * @return - the factory
   */
  public DataExchangeFactory getDataExchangeFactory() {
    return dataExchangeFactory;
  }

}