001 package edu.nrao.sss.webapp.faces.component;
002
003 import javax.faces.component.UIComponent;
004 import javax.faces.component.UIInput;
005 import javax.faces.component.NamingContainer;
006 import javax.faces.context.FacesContext;
007 import javax.faces.context.ResponseWriter;
008 import javax.faces.el.ValueBinding;
009
010 import edu.nrao.sss.math.Polynomial;
011 import edu.nrao.sss.math.PolynomialTerm;
012 import edu.nrao.sss.util.StringUtil;
013
014 import java.io.IOException;
015 import java.util.Map;
016 import java.util.Iterator;
017
018 import org.apache.log4j.Logger;
019
020 public class PolynomialUIComponent extends UIInput implements NamingContainer
021 {
022 private Boolean enabled = null;
023 private static Logger log = Logger.getLogger(PolynomialUIComponent.class);
024
025 public void encodeBegin(FacesContext context)
026 throws IOException
027 {
028 Polynomial poly = (Polynomial)getValue();
029
030 String styleClass = (String)getAttributes().get("styleClass");
031 String style = (String)getAttributes().get("style");
032
033 ResponseWriter writer = context.getResponseWriter();
034
035 String id = getClientId(getFacesContext());
036 String termIdPrefix = id + "term";
037
038 writer.startElement("div", this);
039 writer.writeAttribute("id", id, null);
040 if (styleClass != null)
041 writer.writeAttribute("class", styleClass, null);
042
043 if (style != null)
044 writer.writeAttribute("style", style, null);
045
046 StringUtil su = StringUtil.getInstance();
047 if (isEnabled())
048 {
049 for (Iterator<PolynomialTerm> values = poly.getTerms().values().iterator(); values.hasNext();)
050 {
051 PolynomialTerm t = values.next();
052 String tid = termIdPrefix + t.getExponent();
053
054 writer.startElement("input", this);
055 writer.writeAttribute("type", "text", null);
056 writer.writeAttribute("size", "5", null);
057 writer.writeAttribute("id", tid, null);
058 writer.writeAttribute("name", tid, null);
059 writer.writeAttribute("value", su.formatNoScientificNotation(t.getCoefficient()), null);
060 writer.writeAttribute("onblur", "iceSubmitPartial(form, this, event); return false;", null);
061 writer.endElement("input");
062
063 writer.write(" x");
064 writer.startElement("sup", this);
065 writer.write(String.valueOf(t.getExponent()));
066 writer.endElement("sup");
067
068 if (values.hasNext())
069 writer.write(" + ");
070 }
071 }
072
073 else
074 {
075 for (Iterator<PolynomialTerm> values = poly.getTerms().values().iterator(); values.hasNext();)
076 {
077 PolynomialTerm t = values.next();
078 String tid = termIdPrefix + t.getExponent();
079
080 writer.startElement("span", this);
081 writer.writeAttribute("id", tid, null);
082 writer.write(su.formatNoScientificNotation(t.getCoefficient()) + "x");
083
084 writer.startElement("sup", this);
085 writer.write(String.valueOf(t.getExponent()));
086 writer.endElement("sup");
087
088 if (values.hasNext())
089 writer.write(" + ");
090
091 writer.endElement("span");
092 }
093 }
094
095 writer.endElement("div");
096
097 //Start a div, then let our child UICommand render itself.
098 writer.startElement("div", this);
099 if (styleClass != null)
100 writer.writeAttribute("class", styleClass, null);
101
102 if (style != null)
103 writer.writeAttribute("style", style, null);
104 }
105
106 public void encodeEnd(FacesContext context)
107 throws IOException
108 {
109 ResponseWriter writer = context.getResponseWriter();
110 if (isEnabled())
111 {
112 String coeffId = getClientId(getFacesContext()) + "newTermCoef";
113 String expId = getClientId(getFacesContext()) + "newTermExp";
114
115 //Now we add an input field and selectOneMenu.
116 writer.startElement("input", this);
117 writer.writeAttribute("type", "text", null);
118 writer.writeAttribute("size", "5", null);
119 writer.writeAttribute("id", coeffId, null);
120 writer.writeAttribute("name", coeffId, null);
121 writer.writeAttribute("value", "0", null);
122 writer.endElement("input");
123
124 writer.startElement("select", this);
125 writer.writeAttribute("name", expId, null);
126
127 writer.startElement("option", this);
128 writer.writeAttribute("value", "1", null);
129 writer.write("x");
130 writer.endElement("option");
131
132 writer.startElement("option", this);
133 writer.writeAttribute("value", "2", null);
134
135 writer.write("x");
136 writer.startElement("sup", this);
137 writer.write("2");
138 writer.endElement("sup");
139
140 writer.endElement("option");
141
142 writer.startElement("option", this);
143 writer.writeAttribute("value", "3", null);
144
145 writer.write("x");
146 writer.startElement("sup", this);
147 writer.write("3");
148 writer.endElement("sup");
149
150 writer.endElement("option");
151
152 writer.startElement("option", this);
153 writer.writeAttribute("value", "4", null);
154
155 writer.write("x");
156 writer.startElement("sup", this);
157 writer.write("4");
158 writer.endElement("sup");
159
160 writer.endElement("option");
161
162 writer.startElement("option", this);
163 writer.writeAttribute("value", "5", null);
164
165 writer.write("x");
166 writer.startElement("sup", this);
167 writer.write("5");
168 writer.endElement("sup");
169
170 writer.endElement("option");
171
172 writer.endElement("select");
173 }
174
175 writer.endElement("div");
176 }
177
178 public void decode(FacesContext context)
179 {
180 Map parms = context.getExternalContext().getRequestParameterMap();
181
182 String termIdPrefix = getClientId(getFacesContext()) + "term";
183 int prefixLength = termIdPrefix.length();
184
185 StringBuilder poly = new StringBuilder();
186
187 StringUtil su = StringUtil.getInstance();
188
189 for (Iterator keys = parms.keySet().iterator(); keys.hasNext();)
190 {
191 String key = (String)keys.next();
192
193 //Found a term entry, append the exponent and value
194 //(coefficient) to the submitted value.
195 if (key.startsWith(termIdPrefix))
196 {
197 //Take from the end of the prefix to the end of the string to
198 //be the exponent.
199 String exp = key.substring(prefixLength);
200 String coefStr = ((String)parms.get(key)).trim();
201
202 Double coef;
203 try { coef = Double.parseDouble(coefStr); }
204 catch(NumberFormatException nfe) { coef = null; }
205
206 if (coef != null && coef != 0)
207 poly.append(su.formatNoScientificNotation(coef) + "x^" + exp + " + ");
208 }
209 }
210
211 //remove the last " + "
212 if (poly.length() >= 3)
213 poly.setLength(poly.length() - 3);
214
215 log.debug("Polynomial w/o extra terms: " + poly);
216 if (getChildCount() == 1)
217 {
218 String buttonId = ((UIComponent)getChildren().get(0)).getClientId(context);
219 log.debug("\tchild buttonId: " + buttonId);
220
221 //If the add term button was hit....
222 if (parms.get(buttonId) != null)
223 {
224 log.debug("\tAdding Extra term");
225 //Now we have to check to see if they entered a new term.
226 String newCoefId = getClientId(getFacesContext()) + "newTermCoef";
227 String newExpId = getClientId(getFacesContext()) + "newTermExp";
228
229 String newCoefStr = (String)parms.get(newCoefId);
230 if (newCoefStr != null)
231 newCoefStr = newCoefStr.trim();
232
233 String newExp = (String)parms.get(newExpId);
234 if (newExp != null)
235 newExp = newExp.trim();
236
237 //if there's a valid non-zero value for the coeff, add it as a term.
238 Double newCoef;
239 try { newCoef = Double.parseDouble(newCoefStr); }
240 catch(NumberFormatException nfe) { newCoef = null; }
241
242 if (newCoef != null && newCoef != 0)
243 {
244 if (poly.length() > 0)
245 poly.append(" + ");
246
247 poly.append(su.formatNoScientificNotation(newCoef) + "x^" + newExp);
248 }
249 }
250 }
251
252 log.debug("Polynomial before the set submit: " + poly);
253
254 setValid(true);
255 setSubmittedValue(poly.toString());
256 }
257
258 public Boolean isEnabled()
259 {
260 if (this.enabled != null)
261 return this.enabled;
262
263 ValueBinding vb = getValueBinding("enabled");
264 if (vb != null)
265 {
266 Object val = vb.getValue(getFacesContext());
267
268 if (val instanceof Boolean && val != null)
269 return (Boolean)val;
270 }
271
272 //else
273 return Boolean.TRUE;
274 }
275
276 public void setEnabled(Boolean e)
277 {
278 this.enabled = e;
279 }
280
281 /**
282 * Adds the enabled status of this component to the state being saved.
283 */
284 public Object saveState(FacesContext context)
285 {
286 Object[] state = new Object[2];
287 state[0] = super.saveState(context);
288 state[1] = this.enabled;
289 return state;
290 }
291
292 /**
293 * restores the enabled status of this component
294 */
295 public void restoreState(FacesContext context, Object state)
296 {
297 Object[] mystate = (Object[])state;
298 super.restoreState(context, mystate[0]);
299
300 this.enabled = (Boolean)mystate[1];
301 }
302 }