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1
13 package com.tonbeller.wcf.param;
14
15 import java.io.IOException  ;
16 import java.lang.reflect.Method ;
17 import java.util.ArrayList ;
18 import java.util.Iterator ;
19 import java.util.List ;
20
21 import javax.servlet.jsp.JspException ;
22 import javax.servlet.jsp.tagext.TagSupport ;
23
24 import org.apache.log4j.Logger;
25
26 import com.tonbeller.tbutils.res.Resources;
27 import com.tonbeller.wcf.controller.Controller;
28 import com.tonbeller.wcf.controller.RequestContext;
29 import com.tonbeller.wcf.controller.RequestListener;
30 import com.tonbeller.wcf.expr.ExprUtils;
31 import com.tonbeller.wcf.token.RequestToken;
32 import com.tonbeller.wcf.utils.DomUtils;
33
34
41 public class ParamLinkTag extends TagSupport {
42 String page;
43
44 String displayName;
45 String displayValue;
46 String paramName;
47 String sqlValue;
48 String mdxValue;
49 String textValue;
50 String target;
52 boolean token;
54
55
59 ClickHandler clickHandler;
60
61
67 public interface Action {
68 void execute(RequestContext context) throws Exception ;
69 }
70
71
78 public static class InvokeMethodAction implements Action {
79 private String methodName;
80 private String targetExpr;
81
82 InvokeMethodAction(String targetExpr, String methodName) {
83 this.targetExpr = targetExpr;
84 this.methodName = methodName;
85 }
86
87 public void execute(RequestContext context) throws Exception {
88 Object target = context.getModelReference(targetExpr);
89 Class c = target.getClass();
90 Method m = c.getMethod(methodName, new Class [] { RequestContext.class});
91 m.invoke(target, new Object [] { context});
92 }
93 }
94
95 private static Logger logger = Logger.getLogger(ParamLinkTag.class);
96
97 static class ClickHandler implements RequestListener {
98 private List params = new ArrayList ();
99 private List actions = new ArrayList ();
100 private String page;
101
102 ClickHandler(String page) {
103 this.page = page;
104 }
105
106 public void addParam(SessionParam param) {
107 params.add(param);
108 }
109
110 public void addAction(Action action) {
111 actions.add(action);
112 }
113
114 public void request(RequestContext context) throws Exception {
115 SessionParamPool pool = SessionParamPool.instance(context.getSession());
117 for (Iterator it = params.iterator(); it.hasNext();) {
118 SessionParam p = (SessionParam) it.next();
119 if (logger.isInfoEnabled()) {
120 logger.info("setting parameter: " + p);
121 }
122 pool.setParam(p);
123 }
124 for (Iterator it = actions.iterator(); it.hasNext();) {
126 Action a = (Action) it.next();
127 a.execute(context);
128 }
129 if (page != null)
131 Controller.instance(context.getSession()).setNextView(page);
132 }
133 }
134
135 ParamLinkGroupTag groupTag;
136
137 public int doStartTag() throws JspException {
138 try {
139 clickHandler = null;
140 groupTag = (ParamLinkGroupTag) findAncestorWithClass(this, ParamLinkGroupTag.class);
141 if (groupTag == null)
142 throw new JspException ("ParamLinkTag must be used inside a ParamLinkGroupTag");
143 if (!groupTag.isRenderActions())
145 return EVAL_BODY_INCLUDE;
146
147 String id = DomUtils.randomId();
148 clickHandler = new ClickHandler(evalString(page));
149 groupTag.getDispatcher().addRequestListener(groupTag.getId(), id, clickHandler);
150
151 Resources res = Resources.instance(ParamLinkTag.class);
152 String htmlTarget = "";
153 if (getTarget() != null) {
154 htmlTarget = " " + res.getString("paramLinkTag.targetTag", getTarget());
155 }
156
157 String href = "?" + groupTag.getId() + "=" + id;
158 if (token) {
159 RequestToken rt = RequestToken.instance(pageContext.getSession());
160 href = rt.appendHttpParameter(href);
161 }
162
163 Object [] args = { href, htmlTarget};
164 String s = res.getString("paramLinkTag.startTag", args);
165 pageContext.getOut().print(s);
166
167 if (paramName != null)
168 addParam(paramName, displayName, displayValue, sqlValue, mdxValue, textValue);
169
170 } catch (IOException e) {
171 logger.error(null, e);
172 }
173
174 return EVAL_BODY_INCLUDE;
175 }
176
177
186 public void addParam(String paramName, String displayName, String displayValue, String sqlValue,
187 String mdxValue, String textValue) {
188
189 if (paramName == null)
190 throw new IllegalArgumentException ("parameter name is null");
191
192 SessionParam p = new SessionParam();
193 p.setName(paramName);
194 p.setDisplayName(evalString(displayName));
195 p.setDisplayValue(evalString(displayValue));
196 p.setTextValue(evalString(textValue));
197 p.setMdxValue(mdxValue);
198 p.setSqlValue(eval(sqlValue));
199 addParam(p);
200 }
201
202
205 public void addParam(SessionParam p) {
206 if (clickHandler != null)
207 clickHandler.addParam(p);
208 }
209
210 public void addAction(Action a) {
211 if (clickHandler != null)
212 clickHandler.addAction(a);
213 }
214
215 public int doEndTag() throws JspException {
216 if (!groupTag.isRenderActions())
217 return super.doEndTag();
218 try {
219 Resources res = Resources.instance(ParamLinkTag.class);
220 String s = res.getString("paramLinkTag.endTag");
221 pageContext.getOut().print(s);
222 } catch (IOException e) {
223 logger.error(null, e);
224 }
225 clickHandler = null;
226 return super.doEndTag();
227 }
228
229 private Object eval(String expr) {
230 if (expr == null)
231 return null;
232 if (ExprUtils.isExpression(expr))
233 return ExprUtils.getModelReference(pageContext, expr);
234 return expr;
235 }
236
237 private String evalString(String expr) {
238 if (expr == null)
239 return null;
240 if (ExprUtils.isExpression(expr))
241 return String.valueOf(ExprUtils.getModelReference(pageContext, expr));
242 return expr;
243 }
244
245 public void setDisplayName(String displayName) {
246 this.displayName = displayName;
247 }
248
249 public void setDisplayValue(String displayValue) {
250 this.displayValue = displayValue;
251 }
252
253 public void setMdxValue(String mdxValue) {
254 this.mdxValue = mdxValue;
255 }
256
257 public void setParamName(String paramName) {
258 this.paramName = paramName;
259 }
260
261 public void setSqlValue(String sqlValue) {
262 this.sqlValue = sqlValue;
263 }
264
265 public void setPage(String page) {
266 this.page = page;
267 }
268
269 public String getTextValue() {
270 return textValue;
271 }
272
273 public void setTextValue(String textValue) {
274 this.textValue = textValue;
275 }
276
277 public void setTarget(String target) {
278 this.target = target;
279 }
280
281 public String getTarget() {
282 return target;
283 }
284
285 public void setToken(boolean token) {
286 this.token = token;
287 }
288
289 } |
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