Java > Open Source Codes > de > laures > cewolf > taglib > html > AbstractHTMLBaseTag


1 /* ================================================================
2  * Cewolf : Chart enabling Web Objects Framework
3  * ================================================================
4  *
5  * Project Info: http://cewolf.sourceforge.net
6  * Project Lead: Guido Laures (guido@laures.de);
7  *
8  * (C) Copyright 2002, by Guido Laures
9  *
10  * This library is free software; you can redistribute it and/or modify it under the terms
11  * of the GNU Lesser General Public License as published by the Free Software Foundation;
12  * either version 2.1 of
13  * the License, or (at your option) any later version.
14  *
15  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
16  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17  * See the GNU Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public License along with this
20  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
21  * Boston, MA 02111-1307, USA.
22  */
23
24 package de.laures.cewolf.taglib.html;
25
26 import java.io.IOException ;
27 import java.io.Serializable ;
28 import java.io.Writer ;
29
30 import javax.servlet.jsp.JspException ;
31 import javax.servlet.jsp.JspWriter ;
32
33 import de.laures.cewolf.taglib.tags.CewolfBodyTag;
34
35 /**
36  * Abstract base class which holds attribbutes common for all HTML 4.0 tags.
37  * @author Guido Laures
38  */
39 public abstract class AbstractHTMLBaseTag extends CewolfBodyTag implements Serializable {
40     
41     protected static final int UNDEFINED_INT = -1;
42     protected static final float UNDEFINED_FLOAT = -1.0f;
43     protected static final String UNDEFINED_STR = null;
44     
45     /** Holds value of property ID. */
46     protected String id = UNDEFINED_STR;
47     
48     /** Holds value of property clazz. */
49     protected String clazz = UNDEFINED_STR;
50     
51     /** Holds value of property style. */
52     protected String style = UNDEFINED_STR;
53     
54     /** Holds value of property title. */
55     protected String title = UNDEFINED_STR;
56     
57     /** Holds value of property lang. */
58     protected String lang = UNDEFINED_STR;
59     
60     /** Holds value of property dir. */
61     protected String dir = UNDEFINED_STR;
62     
63     /** Holds value of property onclick. */
64     protected String onclick = UNDEFINED_STR;
65     
66     /** Holds value of property ondbclick. */
67     protected String ondbclick = UNDEFINED_STR;
68     
69     /** Holds value of property onmousedown. */
70     protected String onmousedown = UNDEFINED_STR;
71     
72     /** Holds value of property onmouseup. */
73     protected String onmouseup = UNDEFINED_STR;
74     
75     /** Holds value of property onmouseover. */
76     protected String onmouseover = UNDEFINED_STR;
77     
78     /** Holds value of property onmousemove. */
79     protected String onmousemove = UNDEFINED_STR;
80     
81     /** Holds value of property onmouseout. */
82     protected String onmouseout = UNDEFINED_STR;
83     
84     /** Holds value of property onkeypress. */
85     protected String onkeypress = UNDEFINED_STR;
86     
87     /** Holds value of property onkeydown. */
88     protected String onkeydown = UNDEFINED_STR;
89     
90     /** Holds value of property onkeyup. */
91     protected String onkeyup = UNDEFINED_STR;
92     
93     public AbstractHTMLBaseTag(){
94         setId(UNDEFINED_STR);
95     }
96     
97     protected abstract String getTagName();
98     
99     protected abstract boolean hasBody();
100     
101     protected abstract boolean wellFormed();
102     
103     protected void reset(){
104         this.clazz = UNDEFINED_STR;
105         this.dir = UNDEFINED_STR;
106         this.id = UNDEFINED_STR;
107         this.lang = UNDEFINED_STR;
108         this.onclick = UNDEFINED_STR;
109         this.ondbclick = UNDEFINED_STR;
110         this.onkeydown = UNDEFINED_STR;
111         this.onkeypress = UNDEFINED_STR;
112         this.onkeyup = UNDEFINED_STR;
113         this.onmousedown = UNDEFINED_STR;
114         this.onmousemove = UNDEFINED_STR;
115         this.onmouseout = UNDEFINED_STR;
116         this.onmouseover = UNDEFINED_STR;
117         this.onmouseup = UNDEFINED_STR;
118         this.style = UNDEFINED_STR;
119         this.title = UNDEFINED_STR;
120     }
121     
122     public int doStartTag() throws JspException {
123         JspWriter writer = pageContext.getOut();
124         try {
125             writer.write("<" + getTagName());
126             writeAttributes(writer);
127             if(hasBody()){
128                 writer.write(">");
129                 return EVAL_PAGE;
130             } else {
131                 return SKIP_BODY;
132             }
133         } catch(IOException ioe){
134             super.pageContext.getServletContext().log("",ioe);
135             throw new JspException (ioe.getMessage());
136         }
137     }
138     
139     public int doEndTag() throws JspException {
140         JspWriter writer = pageContext.getOut();
141         try{
142             if(hasBody()){
143                 writer.write("</" + getTagName() + ">");
144             } else {
145                 if(wellFormed()){
146                     writer.write(" /");
147                 }
148                 writer.write(">");
149             }
150             return doAfterEndTag(EVAL_PAGE);
151         } catch(IOException ioe){
152             super.pageContext.getServletContext().log("",ioe);
153             throw new JspException (ioe.getMessage());
154         }
155     }
156     
157     public void writeAttributes(Writer wr){
158         try {
159             appendAttributeDeclaration(wr, getId(), "ID");
160             appendAttributeDeclaration(wr, this.clazz, "CLASS");
161             appendAttributeDeclaration(wr, this.style, "STYLE");
162             appendAttributeDeclaration(wr, this.onclick, "ONCLICK");
163             appendAttributeDeclaration(wr, this.ondbclick, "ONDBCLICK");
164             appendAttributeDeclaration(wr, this.onkeydown, "ONKEYDOWN");
165             appendAttributeDeclaration(wr, this.onkeypress, "ONKEYPRESS");
166             appendAttributeDeclaration(wr, this.onkeyup, "ONKEYUP");
167             appendAttributeDeclaration(wr, this.onmousedown, "ONMOUSEDOWN");
168             appendAttributeDeclaration(wr, this.onmousemove, "ONMOUSEMOVE");
169             appendAttributeDeclaration(wr, this.onmouseout, "ONMOUSEOUT");
170             appendAttributeDeclaration(wr, this.onmouseover, "ONMOUSEOVER");
171             appendAttributeDeclaration(wr, this.onmouseup, "ONMOUSEUP");
172             appendAttributeDeclaration(wr, this.title, "TITLE");
173             appendAttributeDeclaration(wr, this.lang, "LANG");
174             appendAttributeDeclaration(wr, this.dir, "DIR");
175         } catch(IOException ioex){
176             ioex.printStackTrace();
177         }
178     }
179     
180     protected void appendAttributeDeclaration(Writer wr, String attr, String name) throws IOException {
181         if(attr != UNDEFINED_STR){
182             wr.write(" " + name + "=\"" + attr + "\"");
183         }
184     }
185     
186     protected void appendAttributeDeclaration(Writer wr, int attr, String name) throws IOException {
187         // does not call the according method for Strings to avoid additional
188 // String instantiation
189 if(attr != UNDEFINED_INT){
190             wr.write(" " + name + "=\"" + attr + "\"");
191         }
192     }
193     
194     protected void appendAttributeDeclaration(Writer wr, float attr, String name) throws IOException {
195         // does not call the according method for Strings to avoid additional
196 // String instantiation
197 if(attr != UNDEFINED_FLOAT){
198             wr.write(" " + name + "=\"" + attr + "\"");
199         }
200     }
201     
202     /** Setter for property clazz.
203      * @param clazz New value of property clazz.
204      */
205     public void setClass(String clazz) {
206         this.clazz = clazz;
207     }
208     
209     /** Setter for property style.
210      * @param style New value of property style.
211      */
212     public void setStyle(String style) {
213         this.style = style;
214     }
215     
216     /** Setter for property title.
217      * @param title New value of property title.
218      */
219     public void setHtmltitle(String title) {
220         this.title = title;
221     }
222     
223     /** Setter for property lang.
224      * @param lang New value of property lang.
225      */
226     public void setLang(String lang) {
227         this.lang = lang;
228     }
229     
230     /** Setter for property dir.
231      * @param dir New value of property dir.
232      */
233     public void setDir(String dir) {
234         this.dir = dir;
235     }
236     
237     /** Setter for property onclick.
238      * @param onclick New value of property onclick.
239      */
240     public void setOnclick(String onclick) {
241         this.onclick = onclick;
242     }
243     
244     /** Setter for property ondbclick.
245      * @param ondbclick New value of property ondbclick.
246      */
247     public void setOndbclick(String ondbclick) {
248         this.ondbclick = ondbclick;
249     }
250     
251     /** Setter for property onmousedown.
252      * @param onmousedown New value of property onmousedown.
253      */
254     public void setOnmousedown(String onmousedown) {
255         this.onmousedown = onmousedown;
256     }
257     
258     /** Setter for property onmouseup.
259      * @param onmouseup New value of property onmouseup.
260      */
261     public void setOnmouseup(String onmouseup) {
262         this.onmouseup = onmouseup;
263     }
264     
265     /** Setter for property onmouseover.
266      * @param onmouseover New value of property onmouseover.
267      */
268     public void setOnmouseover(String onmouseover) {
269         this.onmouseover = onmouseover;
270     }
271     
272     /** Setter for property onmousemove.
273      * @param onmousemove New value of property onmousemove.
274      */
275     public void setOnmousemove(String onmousemove) {
276         this.onmousemove = onmousemove;
277     }
278     
279     /** Setter for property onmouseout.
280      * @param onmouseout New value of property onmouseout.
281      */
282     public void setOnmouseout(String onmouseout) {
283         this.onmouseout = onmouseout;
284     }
285     
286     /** Setter for property onkeypress.
287      * @param onkeypress New value of property onkeypress.
288      */
289     public void setOnkeypress(String onkeypress) {
290         this.onkeypress = onkeypress;
291     }
292     
293     /** Setter for property onkeydown.
294      * @param onkeydown New value of property onkeydown.
295      */
296     public void setOnkeydown(String onkeydown) {
297         this.onkeydown = onkeydown;
298     }
299     
300     /** Setter for property onkeyup.
301      * @param onkeyup New value of property onkeyup.
302      */
303     public void setOnkeyup(String onkeyup) {
304         this.onkeyup = onkeyup;
305     }
306     
307 }
308

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