|
1
15
16 package com.jdon.strutsutil;
17
18 import java.util.ArrayList  ;
19 import java.util.Collection ;
20 import java.util.List ;
21
22 import javax.servlet.http.HttpServletRequest ;
23 import javax.servlet.http.HttpServletResponse ;
24
25 import org.apache.struts.action.ActionForm;
26 import org.apache.struts.action.ActionForward;
27 import org.apache.struts.action.ActionMapping;
28
29 import com.jdon.controller.model.Model;
30 import com.jdon.controller.model.ModelIF;
31 import com.jdon.controller.model.PageIterator;
32 import com.jdon.model.ModelKey;
33 import com.jdon.util.Debug;
34
35
40 public abstract class ModelListAction extends ModelBaseAction {
41
42 private final static String module = ModelListAction.class.getName();
43
44 public ActionForward execute(ActionMapping actionMapping,
45 ActionForm actionForm,
46 HttpServletRequest request,
47 HttpServletResponse response) throws
48 Exception {
49
50 intContext(this.getServlet().getServletContext());
51
52
53 int start = 0;
54 int count = 30;
55
56 String startStr = request.getParameter("start");
57 if ( (startStr != null) && (startStr.length() != 0)) {
58 start = Integer.parseInt(startStr);
59 }
60 String countStr = request.getParameter("count");
61 if ( (countStr != null) && (countStr.length() != 0)) {
62 count = Integer.parseInt(countStr);
63 }
64
65
66 ModelListForm listForm = getModelListForm(actionMapping, actionForm, request);
67 listForm.setStart(start);
68
69 PageIterator pageIterator = getPageIterator(request, start, count);
70 if (pageIterator != null) { if (pageIterator.isElementsTypeIsKey()){
72 setModellistByKey(listForm, pageIterator, request);
73 }else{
74 setModellistByModel(listForm, pageIterator, request);
75 }
76 } else {
77 Debug.logError("getPageIterator not be implemented, you must implement either of them ", module);
78 listForm.setList(new ArrayList ());
79 }
80
81 listForm.setOneModel(setupOneModelIF(request));
82 customizeListForm(actionMapping, actionForm, request, listForm);
83
84 if (actionMapping.findForward(FormBeanUtil.FORWARD_SUCCESS_NAME) == null)
85 Debug.logError(
86 "not found the forward name '" + FormBeanUtil.FORWARD_SUCCESS_NAME +
87 "' in struts-config.xml", module);
88
89 return actionMapping.findForward(FormBeanUtil.FORWARD_SUCCESS_NAME);
90 }
91
92 private void setModellistByKey(ModelListForm listForm,
93 PageIterator pageIterator, HttpServletRequest request) {
94 Collection c = null;
95 try {
96 listForm.setAllCount(pageIterator.getAllCount());
97 if (pageIterator.getCount() != 0)
98 listForm.setCount(pageIterator.getCount()); c = getModelList(request, pageIterator);
101 Debug.logVerbose(
102 "[JdonFramework] listForm 's property: getList size is "
103 + c.size(), module);
104 pageIterator.reset();
105 } catch (Exception e) {
106 Debug.logError(" setModellistByKey error " + e, module);
107 c = new ArrayList ();
108 }
109 listForm.setList(c);
110 }
111
112
115 private void setModellistByModel(ModelListForm listForm,
116 PageIterator pageIterator, HttpServletRequest request) {
117 Collection c = null;
118 try {
119 listForm.setAllCount(pageIterator.getAllCount());
120 if (pageIterator.getCount() != 0)
121 listForm.setCount(pageIterator.getCount());
122 c = new ArrayList (pageIterator.getSize());
123 while (pageIterator.hasNext()) {
124 Object o = pageIterator.next();
125 if ( o != null)
126 c.add(o);
127 }
128 Debug.logVerbose(
129 "[JdonFramework] listForm 's property: getList size is "
130 + c.size(), module);
131 pageIterator.reset();
132 } catch (Exception e) {
133 Debug.logError(" setModellistByModel error " + e, module);
134 c = new ArrayList ();
135 }
136 listForm.setList(c);
137 }
138
139
148 protected ModelListForm getModelListForm(ActionMapping actionMapping,
149 ActionForm actionForm,
150 HttpServletRequest request) throws
151 Exception {
152 ModelListForm modelListForm = null;
153 if (actionForm == null){
154 modelListForm = new ModelListForm();
155 FormBeanUtil.saveActionForm(modelListForm, actionMapping, request);
156 }else if (actionForm instanceof ModelListForm)
157 modelListForm = (ModelListForm) actionForm;
158
159 if (modelListForm == null)
160 throw new Exception (
161 "not found the bean of com.jdon.strutsutil.ModelListForm");
162 else
163 return modelListForm;
164
165 }
166
167
174 protected List getModelList(HttpServletRequest request,
175 PageIterator pageIterator) throws Exception {
176 List list = new ArrayList (pageIterator.getSize());
177 ModelIF model = null;
178 Class modelClass = null;
179 while (pageIterator.hasNext()) {
180 Object dataKey = pageIterator.next();
181 if ( (modelClass == null) || (!isEnableCache())) {
182 Debug.logVerbose("[JdonFramework] getCache from db. " , module);
183 model = fetchModel(request, dataKey);
184 if (model != null)
185 modelClass = model.getClass();
186 else
187 continue;
188 } else {
189 ModelKey modelKey = new ModelKey(dataKey, modelClass);
191 model = modelManager.getCache(modelKey);
192 if (model == null) {
193 model = fetchModel(request, dataKey);
194 modelManager.addCache(modelKey, model);
195 }
196 }
197 if (model != null)
198 list.add(model);
199 }
200 return list;
201 }
202
203
204
217 public void customizeListForm(ActionMapping actionMapping,
218 ActionForm actionForm,
219 HttpServletRequest request,
220 ModelListForm modelListForm ) throws Exception {
221
222
223 }
224
225
226
232 protected boolean isEnableCache() {
233 return true;
234 }
235
236 private ModelIF fetchModel(HttpServletRequest request, Object dataKey) throws
237 Exception {
238 if (dataKey == null) return null;
239 ModelIF model = null;
240 try {
241 model = findModelIFByKey(request, dataKey);
242 if (model == null){
243 Debug.logWarning("[JdonFramework] the model is null for the primary key=" + dataKey+" and data type=" + dataKey.getClass().getName()+ ", reasons:", module);
244 Debug.logWarning("[JdonFramework] 1. maybe the data in database wae deleted ", module);
245 Debug.logWarning("[JdonFramework] 2. a error occured in the findModelByKey mehtod of the class "+ this.getClass().getName(), module);
246 }
247 } catch (Exception ex) {
248 Debug.logError(ex, module);
249 }
250 return model;
251 }
252
253 protected ModelIF setupOneModelIF(HttpServletRequest request) {
254 return setupOneModel(request);
255 }
256
257 protected Model setupOneModel(HttpServletRequest request){
258 return null;
259 }
260
261
262
270 public abstract PageIterator getPageIterator(HttpServletRequest request,
271 int start,
272 int count);
273
274
281 public ModelIF findModelIFByKey(HttpServletRequest request, Object key){
282 return findModelByKey(request, key);
283 }
284
285
288 public Model findModelByKey(HttpServletRequest request, Object key){
289 return null;
290 }
291
292
293
294
295 }
296 |
Popular Tags |
Java API By Example, From Geeks To Geeks.