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17
22 package org.ditchnet.jsp.taglib.tabs.handler;
23
24 import java.io.StringWriter  ;
25 import java.io.IOException ;
26 import java.util.List ;
27 import java.util.ArrayList ;
28 import java.util.Iterator ;
29 import javax.servlet.http.Cookie ;
30 import javax.servlet.http.HttpServletRequest ;
31 import javax.servlet.jsp.JspWriter ;
32 import javax.servlet.jsp.JspContext ;
33 import javax.servlet.jsp.PageContext ;
34 import javax.servlet.jsp.JspException ;
35 import javax.servlet.jsp.tagext.JspFragment ;
36 import javax.servlet.jsp.tagext.SimpleTagSupport ;
37 import org.ditchnet.jsp.util.JspResponseWriter;
38 import org.ditchnet.xml.Xhtml;
39
40
41
47 public final class TabContainerTag extends SimpleTagSupport {
48
49 public static final String COOKIE_PREFIX = "org.ditchnet.jsp.tabs";
50
51 private String id;
52 private String skin;
53 private List children;
54 private String selectedTabPaneId;
55 private String urlSelectedTabPaneId;
56 private int selectedIndex = 0;
57 private int cookieSelectedIndex = -1;
58 private String jsTabListener;
59 private JspResponseWriter out = new JspResponseWriter();
60
61 public void setId(final String id) {
62 this.id = id;
63 }
64
65 public String getId() {
66 return id;
67 }
68
69 public void setSkin(final String skin) {
70 this.skin = skin.toLowerCase();
71 }
72
73 public String getSkin() {
74 if (null == skin || 0 == skin.length()) {
75 skin = "default";
76 }
77 return skin;
78 }
79
80 public void setSelectedTabPaneId(final String selectedTabPaneId) {
81 this.selectedTabPaneId = selectedTabPaneId;
82 }
83
84 public String getSelectedTabPaneId() {
85 return selectedTabPaneId;
86 }
87
88 void setSelectedIndex(final int selectedIndex) {
89 this.selectedIndex = selectedIndex - 1;
90 }
91
92 int getSelectedIndex() {
93 return selectedIndex;
94 }
95
96 private void setCookieSelectedIndex(final int selectedIndex) {
97 this.cookieSelectedIndex = selectedIndex;
98 }
99
100 private int getCookieSelectedIndex() {
101 return cookieSelectedIndex;
102 }
103
104 private void setUrlSelectedTabPaneId(final String selectedId) {
105 this.urlSelectedTabPaneId = selectedId;
106 }
107
108 private String getUrlSelectedTabPaneId() {
109 return urlSelectedTabPaneId;
110 }
111
112 public void setJsTabListener(final String jsTabListener) {
113 this.jsTabListener = jsTabListener;
114 }
115
116 public String getJsTabListener() {
117 return jsTabListener;
118 }
119
120 List getChildren() {
121 if (null == children) {
122 children = new ArrayList ();
123 }
124 return children;
125 }
126
127 int getChildCount() {
128 return getChildren().size();
129 }
130
131 void addChild(final TabPaneTag child) {
132 getChildren().add(child);
133 }
134
135 public void doTag() throws JspException , IOException {
136 consumeCookie();
137 consumeQueryStringParam();
138
139 StringWriter discardResult = new StringWriter ();
140 StringWriter evalResult = new StringWriter ();
141
142 out.startElement(Xhtml.Tag.DIV);
143 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_SKIN_CLASS_NAME+getSkin());
144 out.startElement(Xhtml.Tag.DIV);
145 out.attribute(Xhtml.Attr.ID,id);
146 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_CONTAINER_CLASS_NAME);
147 out.startElement(Xhtml.Tag.DIV);
148 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_WRAP_CLASS_NAME);
149
150 getJspBody().invoke(evalResult);
151 evalResult.getBuffer().delete(0,evalResult.getBuffer().length());
152 determineSelectedIndex();
153 children = null;
154 getJspBody().invoke(evalResult);
155
156 int i = 0;
157 for (Iterator iter = children.iterator(); iter.hasNext();) {
158 TabPaneTag tabPane = (TabPaneTag)iter.next();
159 out.startElement(Xhtml.Tag.DIV);
160 out.attribute(Xhtml.Attr.ID,tabPane.getId()+TabConstants.TAB_ID_SUFFIX);
161 if (null != getJsTabListener() && getJsTabListener().length() > 0) {
162 out.attribute(Xhtml.Attr.ONCLICK,
163 "org.ditchnet.jsp.TabUtils.tabClicked(event);" +
164 getJsTabListener().trim() + "(new org.ditchnet.jsp.TabEvent(this));");
165 } else {
166 out.attribute(Xhtml.Attr.ONCLICK,
167 "org.ditchnet.jsp.TabUtils.tabClicked(event);");
168 }
169 if (i == getSelectedIndex()) {
170 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_CLASS_NAME + " " +
171 TabConstants.FOCUSED_CLASS_NAME);
172 } else {
173 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_CLASS_NAME + " " +
174 TabConstants.UNFOCUSED_CLASS_NAME);
175 }
176 out.startElement(Xhtml.Tag.SPAN);
177 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_BG_LEFT_CLASS_NAME);
178 out.text(" ");
179 out.endElement(Xhtml.Tag.SPAN);
180 out.startElement(Xhtml.Tag.A);
181 out.attribute(Xhtml.Attr.HREF,getTabUrl(tabPane) +
182 TabLinkTag.QUESTION_MARK +
183 TabLinkTag.PARAM_NAME_TAB_PANE_ID +
184 TabLinkTag.EQUALS +
185 tabPane.getId());
186 out.attribute(Xhtml.Attr.ONCLICK,"return false;");
187
188 if (null != tabPane.getTabTitle() &&
189 0 < tabPane.getTabTitle().length()) {
190 out.text(tabPane.getTabTitle());
191 }
192 out.text(" ");
193 out.endElement(Xhtml.Tag.A);
194 out.endElement(Xhtml.Tag.DIV);
195 i++;
196 }
197 out.startElement(Xhtml.Tag.BR);
198 out.attribute(Xhtml.Attr.CLASS,TabConstants.CLEAR_CLASS_NAME);
199 out.endElement(Xhtml.Tag.BR);
200 out.endElement(Xhtml.Tag.DIV);
201 out.comment(TabConstants.TAB_WRAP_CLASS_NAME);
202 out.startElement(Xhtml.Tag.DIV);
203 out.attribute(Xhtml.Attr.CLASS,TabConstants.TAB_PANE_WRAP_CLASS_NAME);
204 out.text(evalResult.getBuffer().toString());
205 out.endElement(Xhtml.Tag.DIV);
206 out.comment(TabConstants.TAB_PANE_WRAP_CLASS_NAME);
207 out.endElement(Xhtml.Tag.DIV);
208 out.comment(TabConstants.TAB_CONTAINER_CLASS_NAME);
209 out.endElement(Xhtml.Tag.DIV);
210 out.comment(TabConstants.TAB_SKIN_CLASS_NAME+getSkin());
211
212 getJspContext().getOut().print(out.getBuffer());
213 }
214
215 private void determineSelectedIndex() {
216 TabPaneTag child;
218 for (int i = 0; i < getChildCount(); i++) {
219 child = (TabPaneTag)getChildren().get(i);
220 if (child.getId().equals(getUrlSelectedTabPaneId())) {
221 setSelectedIndex(i+1);
222 return;
223 }
224 }
225 if (getCookieSelectedIndex() > -1) {
227 setSelectedIndex(cookieSelectedIndex+1);
228 return;
229 }
230 for (int i = 0; i < getChildCount(); i++) {
232 child = (TabPaneTag)getChildren().get(i);
233 if (child.getId().equals(getSelectedTabPaneId())) {
234 setSelectedIndex(i+1);
235 return;
236 }
237 }
238 }
239
240 private String getTabUrl(final TabPaneTag tabPane) {
241 HttpServletRequest request = getRequest();
242 return request.getRequestURL().toString();
243 }
244
245 private void consumeQueryStringParam() {
246 String tabPaneIdParamValue = getRequest().getParameter(
247 TabLinkTag.PARAM_NAME_TAB_PANE_ID );
248 if (null == tabPaneIdParamValue
249 || 0 == tabPaneIdParamValue.length()) {
250 return;
251 }
252 setUrlSelectedTabPaneId( tabPaneIdParamValue );
253 }
254
255 private void consumeCookie() {
256 Cookie [] cookies = getPageCookies();
257 Cookie cookie;
258 String prefix,value;
259 for (int i = 0; i < cookies.length; i++) {
260 cookie = cookies[i];
261 if (isDitchnetTabCookie(cookie)) {
262 int index = cookie.getName().indexOf(":")+1;
263 if (isCookieForThisContainer(cookie,index)) {
264 try {
265 setCookieSelectedIndex(
266 Integer.parseInt(cookie.getValue()));
267 } catch (NumberFormatException e) { }
268 }
269 }
270 }
271 }
272
273 private HttpServletRequest getRequest() {
274 PageContext pageContext = (PageContext )getJspContext();
275 HttpServletRequest request =
276 (HttpServletRequest )pageContext.getRequest();
277 return request;
278 }
279
280 private Cookie [] getPageCookies() {
281 Cookie [] cookies = getRequest().getCookies();
282 if (null == cookies) {
283 cookies = new Cookie [0];
284 }
285 return cookies;
286 }
287
288 private boolean isDitchnetTabCookie(final Cookie cookie) {
289 return 0 == cookie.getName().indexOf(COOKIE_PREFIX) ;
290 }
291
292 private boolean isCookieForThisContainer(final Cookie cookie,
293 final int index) {
294 return cookie.getName().substring(index).equals(getId());
295 }
296
297 }
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