Source Code Cross Referenced for HtmlFractionComponent.java in  » J2EE » Sofia » com » salmonllc » html » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Sofia » com.salmonllc.html 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.salmonllc.html;
002:
003:        /////////////////////////
004:        //$Archive: /SOFIA/SourceCode/com/salmonllc/html/HtmlFractionComponent.java $
005:        //$Author: Dan $ 
006:        //$Revision: 14 $ 
007:        //$Modtime: 10/20/03 3:48p $ 
008:        /////////////////////////
009:        import java.util.Hashtable;
010:
011:        import com.salmonllc.html.events.ValueChangedEvent;
012:
013:        /**
014:         * Implements a two-part entry field for a decimal number.
015:         */
016:        public class HtmlFractionComponent extends HtmlFormComponent {
017:            protected HtmlTextEdit _edit1;
018:            protected double _decimalFactor = 0.0;
019:            protected HtmlContainer _cont;
020:            protected int _size, _scale;
021:            protected HtmlDropDownList _fraction;
022:            protected boolean _noPadding;
023:
024:            /**
025:             * FractionComponent constructor comment.
026:             *
027:             * @param name		Name of component.
028:             * @param p			Page containing component.
029:             * @param size		number of palces for integer portion.
030:             * @param scale		the highest fraction proportion, e.g 64 for 1/64 .. 63/64.
031:             */
032:            public HtmlFractionComponent(String name, HtmlPage p, int size,
033:                    int scale) {
034:                this (name, p, size, scale, null);
035:            }
036:
037:            /**
038:             * FractionComponent constructor comment.
039:             *
040:             * @param name		Name of component.
041:             * @param p			Page containing component.
042:             * @param size		number of palces for integer portion.
043:             * @param scale		the highest fraction proportion, e.g 64 for 1/64 .. 63/64.
044:             * @param preText	Component to display before the entry fields, such as a currency sign.
045:             */
046:            public HtmlFractionComponent(String name, HtmlPage p, int size,
047:                    int scale, HtmlComponent preText) {
048:                super (name, p);
049:                _cont = new HtmlContainer(name, p);
050:                _decimalFactor = 1.0;
051:                // Initialize the fields
052:                if (size < 0)
053:                    size = 0;
054:                if (scale < 0)
055:                    scale = 1;
056:                _size = size;
057:                if (preText != null)
058:                    _cont.add(preText);
059:                _cont.add(_edit1 = new HtmlTextEdit("left", p));
060:                _edit1.setGenerateNewline(false);
061:                _edit1.setSize(size);
062:                _edit1.setMaxLength(size);
063:                _fraction = new HtmlDropDownList("right", p);
064:                _cont.add(_fraction);
065:                _scale = scale;
066:                _fraction.addOption(" ", " ");
067:                for (int i = 1; i < _scale; i++) {
068:                    if (i % 2 != 0) {
069:                        if (_scale % i == 0)
070:                            _fraction.addOption(i + "/" + _scale, "1/" + _scale
071:                                    / i);
072:                        else
073:                            _fraction.addOption(i + "/" + _scale, i + "/"
074:                                    + _scale);
075:                    } else {
076:                        if (_scale % i == 0)
077:                            _fraction.addOption(i + "/" + _scale, "1/" + _scale
078:                                    / i);
079:                        else {
080:                            int j = 1;
081:                            while ((i / (2 * j)) % 2 == 0)
082:                                j++;
083:                            _fraction.addOption(i + "/" + _scale, (i / (2 * j))
084:                                    + "/" + _scale / (2 * j));
085:                        }
086:                    }
087:                }
088:
089:            }
090:
091:            public void generateHTML(java.io.PrintWriter p, int row)
092:                    throws Exception {
093:                // It is essential to call getValue() here because there may be a ValueChanged
094:                // event in the queue for this object, which needs to be removed, which getValue()
095:                // does.  The secondary calls to getValue() from the container will not
096:                // do this because there are no events associated with them.
097:                String val = getValue(row, true);
098:                if (val == null) {
099:                    _edit1.setValue(null, row);
100:                    _fraction.setValue(null, row);
101:                } else {
102:                    try {
103:                        Double dVal;
104:                        if (_dsBuff != null) {
105:                            if (row >= 0)
106:                                dVal = new Double(_dsBuff.getDouble(row,
107:                                        _dsColNo));
108:                            else
109:                                dVal = new Double(_dsBuff.getDouble(_dsColNo));
110:                        } else
111:                            dVal = Double.valueOf(val);
112:                        int integerPart = dVal.intValue();
113:                        String sIntegerPart = Integer.toString(integerPart);
114:                        // Pad left side with spaces, i.e. right-justify the number.
115:                        StringBuffer buf = new StringBuffer();
116:                        if (!_noPadding) {
117:                            int n = _size - sIntegerPart.length();
118:                            while (n-- > 0)
119:                                buf.append(' ');
120:                        }
121:                        buf.append(sIntegerPart);
122:                        _edit1.setValue(buf.toString());
123:                        if (_scale > 0) {
124:                            long top = (long) ((dVal.doubleValue() - (double) integerPart) * _scale);
125:                            _fraction.setValue(top + "/" + _scale);
126:                        }
127:                    } catch (NumberFormatException e) {
128:                        // This should never happen
129:                        _edit1.setValue(null, row);
130:                        _fraction.setValue(null, row);
131:                    }
132:                }
133:                _cont.generateHTML(p, row);
134:                if (_visible && _enabled)
135:                    p.println("");
136:            }
137:
138:            /**
139:             * Returns the sub-component to be used for setting focus.
140:             * @return com.salmonllc.html.HtmlComponent
141:             */
142:            public HtmlComponent getFocus() {
143:                return _edit1;
144:            }
145:
146:            /**
147:             * Returns a double representation of a passed string fraction.
148:             * @return double
149:             * @param sFraction java.lang.String
150:             */
151:            public static double getFractionValue(String sFraction) {
152:                int iDivide = sFraction.indexOf('/');
153:                long top = new Long(sFraction.substring(0, iDivide))
154:                        .longValue();
155:                long bottom = new Long(sFraction.substring(iDivide + 1))
156:                        .longValue();
157:                double value = (double) top / (double) bottom;
158:                return value;
159:            }
160:
161:            /**
162:             * Returns whether the Integer Portion is not padded to the right or not
163:             * @return boolean
164:             */
165:            public boolean getNoPadding() {
166:                return _noPadding;
167:            }
168:
169:            public boolean processParms(Hashtable parms, int rowNo)
170:                    throws Exception {
171:
172:                if (!getVisible() || !getEnabled())
173:                    return false;
174:
175:                // Determine the old value from both edit fields.
176:
177:                String oldValue;
178:                if (_dsBuff == null) {
179:                    oldValue = _edit1.getValue();
180:                    if ((oldValue != null) && (_scale > 0)) {
181:                        if (_fraction.getValue() != null) {
182:                            String sFraction = _fraction.getValue();
183:                            int iDivide = sFraction.indexOf('/');
184:                            long top = new Long(sFraction.substring(0, iDivide))
185:                                    .longValue();
186:                            double value = (double) top / (double) _scale;
187:                            String sValue = "" + value;
188:                            sValue = sValue.substring(1);
189:                            oldValue += sValue;
190:                        }
191:                    }
192:                } else {
193:                    Number n;
194:                    if (rowNo > -1)
195:                        n = (Number) _dsBuff.getAny(rowNo, _dsColNo);
196:                    else
197:                        n = (Number) _dsBuff.getAny(_dsColNo);
198:                    if (n == null)
199:                        oldValue = null;
200:                    else
201:                        oldValue = "" + n.doubleValue();
202:                }
203:
204:                // Determine the new value from both edit fields.
205:
206:                String newValue;
207:                String name1 = _edit1.getFullName();
208:                if (rowNo > -1)
209:                    name1 += "_" + rowNo;
210:                String val[] = (String[]) parms.get(name1);
211:                if (val != null) {
212:                    newValue = val[0].trim();
213:                    if (newValue.equals(""))
214:                        newValue = null;
215:                } else
216:                    newValue = null;
217:
218:                if (_scale > 0) {
219:                    String name2 = _fraction.getFullName();
220:                    if (rowNo > -1)
221:                        name2 += "_" + rowNo;
222:                    val = (String[]) parms.get(name2);
223:                    if (val != null) {
224:                        String s = val[0].trim();
225:                        if (!s.equals("")) {
226:                            if (newValue == null)
227:                                newValue = "";
228:                            int iDivide = s.indexOf('/');
229:                            long top = new Long(s.substring(0, iDivide))
230:                                    .longValue();
231:                            double value = (double) top / (double) _scale;
232:                            String sValue = "" + value;
233:                            sValue = sValue.substring(1);
234:                            newValue += sValue;
235:                        }
236:                    }
237:                }
238:
239:                // Compare old and new values and possibly create a ValueChangedEvent.
240:                if (!valuesEqual(oldValue, newValue)) {
241:                    ValueChangedEvent e = new ValueChangedEvent(getPage(),
242:                            this , getName(), getFullName(), oldValue, newValue,
243:                            rowNo, _dsColNo, _dsBuff);
244:                    addEvent(e);
245:                }
246:                return false;
247:            }
248:
249:            /**
250:             * This method will clear all pending events from the event queue for this component. 
251:             */
252:            public void reset() {
253:                super .reset();
254:                _cont.reset();
255:            }
256:
257:            /**
258:             * Specifies the Style Class to be used for the Component.
259:             * Creation date: (7/19/01 8:41:20 AM)
260:             * @param sClass java.lang.String A name of a class in Html to be used by this component
261:             */
262:            public void setClassName(String sClass) {
263:                super .setClassName(sClass);
264:                _edit1.setClassName(sClass);
265:                _fraction.setClassName(sClass);
266:            }
267:
268:            /**
269:             * Sets the font end tag for disabled mode.
270:             * @param tag java.lang.String
271:             */
272:            public void setDisabledFontEndTag(String tag) {
273:                _edit1.setDisabledFontEndTag(tag);
274:                _fraction.setDisabledFontEndTag(tag);
275:            }
276:
277:            /**
278:             * Sets the font tag for disabled mode.
279:             * @param tag java.lang.String
280:             */
281:            public void setDisabledFontStartTag(String tag) {
282:                _edit1.setDisabledFontStartTag(tag);
283:                _fraction.setDisabledFontStartTag(tag);
284:            }
285:
286:            /**
287:             * Enables or disables the ability of this component to respond to user input.
288:             * @param editable boolean
289:             */
290:            public void setEnabled(boolean enabled) {
291:                super .setEnabled(enabled);
292:                _cont.setEnabled(enabled);
293:            }
294:
295:            /**
296:             * Specify whether to pad integer portion to the right.
297:             * @param bNoPadding boolean
298:             */
299:            public void setNoPadding(boolean bNoPadding) {
300:                _noPadding = bNoPadding;
301:            }
302:
303:            /**
304:             * Specifies the parent component for this Component.
305:             * Creation date: (7/19/01 8:41:20 AM)
306:             * @param sClass java.lang.String A name of a class in Html to be used by this component
307:             */
308:            public void setParent(HtmlComponent parent) {
309:                super .setParent(parent);
310:                // This is necessary for the name to be generated correctly, else the leading
311:                // sequence of parent names will be lost.
312:                _cont.setParent(parent);
313:            }
314:
315:            /**
316:             * @returns the tab index html attribute
317:             */
318:            public int getTabIndex() {
319:                return _edit1.getTabIndex();
320:            }
321:
322:            /**
323:             * @param sets the access key html attribute
324:             */
325:            public String getAccessKey() {
326:                return _edit1.getAccessKey();
327:            }
328:
329:            /**
330:             * @param sets the access key html attribute
331:             */
332:            public void setAccessKey(String val) {
333:                _edit1.setAccessKey(val);
334:            }
335:
336:            /**
337:             * @param sets the tab index html attribute. You can also pass TAB_INDEX_DEFAULT to use the default tab index for the component or TAB_INDEX_NONE to keep this component from being tabbed to
338:             */
339:            public void setTabIndex(int val) {
340:                _edit1.setTabIndex(val);
341:                _fraction.setTabIndex(val + 1);
342:            }
343:        }
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