modelmanagerimp.java

Java/J2EE框架Jdon-Framework系统的Sample

/**
 * Copyright 2005 Jdon.com
 * 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.jdon.model;

import com.jdon.model.config.ModelXmlConfig;
import com.jdon.model.cache.ModelCacheManager;

import com.jdon.controller.model.Model;
import com.jdon.util.Debug;
import com.jdon.model.mapping.*;



/**
 * 本类是产生框架使用的各种Model，面向客户端调用
 * 如果需要调用Model相关，调用本ModelManager
 *
 * 为提高性能，可在此嵌入对象池。
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */
public class ModelManagerImp implements ModelManager{

  public final static String module = ModelManagerImp.class.getName();

  private ModelXmlConfig modelXmlLoader;
  public ModelCacheManager modelCacheManager;

  public ModelManagerImp(ModelXmlConfig modelXmlLoader, ModelCacheManager modelCacheManager) {
    this.modelXmlLoader = modelXmlLoader;
    this.modelCacheManager = modelCacheManager;
  }




  /**
   * 从Modelhandler池中借用一个Handler实例
   * 并且初始化
   *
   * 借用后必须归还
   */
  public ModelHandler borrowtHandlerObject(String formName) {
    ModelHandler modelHandler = null;
    try {
      modelHandler = modelXmlLoader.borrowtHandlerObject(formName);
      modelHandler.setModelMapping(modelXmlLoader.getModelMapping(formName));
    } catch (Exception ex) {
      Debug.logError("can't get the modelHandler for the formName " + formName,
                     module);
    }
    return modelHandler;
  }

  /**
   * 归还从Modelhandler池中借用一个实例
   */
  public void returnHandlerObject(ModelHandler modelHandler) {
    if (modelHandler == null) return;
    try {
      modelXmlLoader.returnHandlerObject(modelHandler);
    } catch (Exception ex) {
      Debug.logError(" return modelHandler error" + ex, module);
    }

  }

  /**
   * 获得一个新的Model实例
   */
  public Model getModelObject(String formName) {
    try {
      return modelXmlLoader.getModelObject(formName);
    } catch (Exception ex) {
      Debug.logError(ex + "", module);
    }
    return null;
  }

  /**
   * 将Model实例加入缓存
   * @param modelKey
   * @param model
   */
  public void addCache(ModelKey modelKey, Model model) {
    if (modelKey.getDataKey() == null)
      return;

    if (modelKey.getModelClassName() != null)
      modelCacheManager.setCache2(modelKey.getDataKey(),
                          modelKey.getModelClassName().getName(), model);
    else
      modelCacheManager.setCache(modelKey.getDataKey(),
                         modelKey.getFormName(), model);

  }

  /**
   * 将Model实例加入缓存
   */
  public void addCache(Object key, String className, Model model) {

    if (key == null)
      return;
    modelCacheManager.setCache2(key, className, model);

  }

  /**
   * 获取加入缓存的Model实例
   */

  public Model getCache(ModelKey modelKey) {
    if (modelKey.getModelClassName() != null)
      return modelCacheManager.getCache2(modelKey.getDataKey(),
                                 modelKey.getModelClassName().getName());
    else
      return modelCacheManager.getCache(modelKey.getDataKey(),
                                modelKey.getFormName());

  }

  /**
   * 获取加入缓存的Model实例
   */

  public Model getCache(Object key, String className) {
    return modelCacheManager.getCache2(key, className);

  }

  /**
   * 取出缓存中的Model实例
   */

  public void removeCache(Object dataKey) throws Exception {
    modelCacheManager.removeCache(dataKey);
  }

  public boolean isNull(String s) {
    boolean isNull = false;
    if (s == null)
      isNull = true;
    else if (s.equals(""))
      isNull = true;
    else if (s.equals("null"))
      isNull = true;
    return isNull;
  }



}