Source Code Cross Referenced for StandardTabRuler.java in  » Internationalization-Localization » icu4j » com » ibm » richtext » styledtext » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.richtext.styledtext 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * (C) Copyright IBM Corp. 1998-2004.  All Rights Reserved.
003:         *
004:         * The program is provided "as is" without any warranty express or
005:         * implied, including the warranty of non-infringement and the implied
006:         * warranties of merchantibility and fitness for a particular purpose.
007:         * IBM will not be liable for any damages suffered by you as a result
008:         * of using the Program. In no event will IBM be liable for any
009:         * special, indirect or consequential damages or lost profits even if
010:         * IBM has been advised of the possibility of their occurrence. IBM
011:         * will not be liable for any third party claims against you.
012:         */
013:        package com.ibm.richtext.styledtext;
014:
015:        import java.util.Vector;
016:
017:        import java.io.Externalizable;
018:        import java.io.ObjectInput;
019:        import java.io.ObjectOutput;
020:        import java.io.IOException;
021:
022:        /**
023:         * This class is a standard implementation of MTabRuler.
024:         * It can have a finite number of client-specified TabStops.  After
025:         * the client-specified TabStops, all TabStops have type
026:         * <code>TabStop.kAuto</code> and are at the autospace intervals.
027:         * @see TabStop
028:         */
029:        public final class StandardTabRuler extends MTabRuler implements 
030:                Externalizable {
031:            static final String COPYRIGHT = "(C) Copyright IBM Corp. 1998-1999 - All Rights Reserved";
032:            private static final int CURRENT_VERSION = 1;
033:            private static final long serialVersionUID = 22356934;
034:
035:            private static final TabStop AUTO_ZERO = new TabStop(0,
036:                    TabStop.kAuto);
037:
038:            private TabStop[] fTabs = null;
039:            private int fAutoSpacing = 36; // every 1/2 inch.
040:
041:            /**
042:             * Create a StandardTabRuler with only auto tabs, with spacing of 36.
043:             */
044:            public StandardTabRuler() {
045:            }
046:
047:            /**
048:             * Create a StandardTabRuler with only auto tabs, with the
049:             * given autoSpacing.
050:             * @param autoSpacing the autoSpacing for this tab ruler
051:             */
052:            public StandardTabRuler(int autoSpacing) {
053:                fAutoSpacing = autoSpacing;
054:            }
055:
056:            /**
057:             * Create a StandardTabRuler.  The first TabStops on the ruler will be
058:             * the TabStops in the <code>tabs</code> array.  After these tabs all
059:             * tabs are auto tabs.
060:             * @param tabs an array of TabStops.  The TabStops in the array must
061:             *    be in strictly increasing order (of positions), and cannot have
062:             *    type <code>TabStop.kAuto</code>.
063:             * @param autoSpacing the autoSpacing interval to use after the last
064:             *    client-specified tab.
065:             */
066:            public StandardTabRuler(TabStop[] tabs, int autoSpacing) {
067:                if (tabs.length > 0) {
068:                    validateTabArray(tabs);
069:                    fTabs = (TabStop[]) tabs.clone();
070:                } else {
071:                    fTabs = null;
072:                }
073:                fAutoSpacing = autoSpacing;
074:            }
075:
076:            /** Tabs as provided, then autoSpacing after the last tab to eternity.  Use this constructor when
077:                munging a ruler, it does no validation on the tabs in the vector. Vector may not be null. */
078:
079:            /*public*/StandardTabRuler(Vector v, int autoSpacing) {
080:                fTabs = tabArrayFromVector(v);
081:                fAutoSpacing = autoSpacing;
082:            }
083:
084:            /** Construct from another ruler. No validation. Ruler may not be null. */
085:
086:            /*public*/StandardTabRuler(MTabRuler ruler) {
087:                if (ruler == null) {
088:                    throw new IllegalArgumentException("ruler may not be null");
089:                }
090:
091:                fTabs = tabArrayFromVector(vectorFromTabRuler(ruler));
092:                fAutoSpacing = ruler.autoSpacing();
093:            }
094:
095:            public void readExternal(ObjectInput in) throws IOException,
096:                    ClassNotFoundException {
097:
098:                int version = in.readInt();
099:                if (version != CURRENT_VERSION) {
100:                    throw new IOException("Invalid version of StyledText: "
101:                            + version);
102:                }
103:                fTabs = (TabStop[]) in.readObject();
104:                fAutoSpacing = in.readInt();
105:            }
106:
107:            public void writeExternal(ObjectOutput out) throws IOException {
108:
109:                out.writeInt(CURRENT_VERSION);
110:                out.writeObject(fTabs);
111:                out.writeInt(fAutoSpacing);
112:            }
113:
114:            /**
115:             * Return first tab in the ruler.  If an autoTab, it is at position zero, and
116:             * all subsequent tabs will be autotabs at autoSpacing intervals.
117:             */
118:            public TabStop firstTab() {
119:                if (fTabs != null && fTabs.length > 0) {
120:                    return fTabs[0];
121:                }
122:
123:                return AUTO_ZERO;
124:            }
125:
126:            /**
127:             * Return the first tab in the ruler with fPosition > position.  If it is an
128:             * autotab, it is at an increment of autoSpacing, and all subsequent tabs will be
129:             * autotabs at autoSpacing intervals.
130:             * @param position the position of the TabStop returned will be greater than this parameter
131:             */
132:            public TabStop nextTab(int position) {
133:                if (fTabs != null) {
134:                    for (int i = 0; i < fTabs.length; ++i) {
135:                        if (position < fTabs[i].getPosition())
136:                            return fTabs[i];
137:                    }
138:                }
139:
140:                if (position >= 4000) { // debug: sanity check
141:                    System.out.println("auto tab past 4000");
142:                }
143:
144:                return new TabStop(((position / fAutoSpacing) + 1)
145:                        * fAutoSpacing, TabStop.kAuto);
146:            }
147:
148:            /**
149:             * Return the interval for autotabs.
150:             */
151:            public int autoSpacing() {
152:                return fAutoSpacing;
153:            }
154:
155:            /**
156:             * Compare this to another Object. Returns true if the object
157:             * is an MTabRuler with the same autoSpacing and tabs.
158:             */
159:            public boolean equals(Object o) {
160:                if (o == this ) {
161:                    return true;
162:                } else if (o == null) {
163:                    return false;
164:                }
165:
166:                MTabRuler rhs;
167:                try {
168:                    rhs = (MTabRuler) o;
169:                } catch (ClassCastException e) {
170:                    return false;
171:                }
172:
173:                if (fAutoSpacing != rhs.autoSpacing())
174:                    return false;
175:
176:                TabStop rhsTab = rhs.firstTab();
177:
178:                if (fTabs != null) {
179:                    for (int i = 0; i < fTabs.length; ++i) {
180:                        if (!fTabs[i].equals(rhsTab))
181:                            return false;
182:
183:                        rhsTab = rhs.nextTab(rhsTab.getPosition());
184:                    }
185:                }
186:
187:                return rhsTab.getType() == TabStop.kAuto;
188:            }
189:
190:            /**
191:             * Return debug information about this tab ruler.
192:             */
193:            public String toString() {
194:                StringBuffer buffer = new StringBuffer(super .toString());
195:                buffer.append(" auto: ");
196:                buffer.append(Integer.toString(fAutoSpacing));
197:
198:                if (fTabs != null) {
199:                    for (int i = 0; i < fTabs.length; ++i) {
200:                        buffer.append(fTabs[i].toString());
201:                    }
202:                }
203:
204:                return buffer.toString();
205:            }
206:
207:            /** Utility to convert a vector of tabs to an array. */
208:
209:            private static TabStop[] tabArrayFromVector(Vector v) {
210:                int count = v.size();
211:                TabStop[] tabs = new TabStop[count];
212:                for (int i = 0; i < count; ++i) {
213:                    tabs[i] = (TabStop) v.elementAt(i);
214:                }
215:
216:                return tabs;
217:            }
218:
219:            /** Utility to convert a ruler to a vector of tabs, for munging. */
220:
221:            private static Vector vectorFromTabRuler(MTabRuler ruler) {
222:                Vector v = new Vector();
223:                for (TabStop tab = ruler.firstTab(); tab != null
224:                        && tab.getType() != TabStop.kAuto; tab = ruler
225:                        .nextTab(tab.getPosition())) {
226:                    v.addElement(tab);
227:                }
228:
229:                return v;
230:            }
231:
232:            /** Utility to validate an array of tabs.  The array must not be null, must not contain null
233:                entries, must not be kAuto, and positions must in increasing order. */
234:
235:            private static void validateTabArray(TabStop[] tabs) {
236:                int pos = Integer.MIN_VALUE;
237:                for (int i = 0; i < tabs.length; ++i) {
238:                    if (tabs[i].getType() == TabStop.kAuto) {
239:                        throw new IllegalArgumentException(
240:                                "can't explicitly specify an auto tab.");
241:                    }
242:                    int nextpos = tabs[i].getPosition();
243:                    if (nextpos <= pos) {
244:                        throw new IllegalArgumentException(
245:                                "tab positions must be in increasing order.");
246:                    }
247:                    pos = nextpos;
248:                }
249:            }
250:
251:            /**
252:             * Return a tab ruler identical to the given ruler, except with the
253:             * given tab added.
254:             * @param ruler the original ruler.  The MTabRuler will be the same as
255:             *   this except for the additional tab.  <code>ruler</code> is not modified.
256:             * @param tabToAdd the tab to add to the new tab ruler
257:             * @return an MTabRuler resulting from this operation
258:             */
259:            /*public*/static MTabRuler addTabToRuler(MTabRuler ruler,
260:                    TabStop tabToAdd) {
261:                if (ruler == null || tabToAdd == null)
262:                    throw new IllegalArgumentException(
263:                            "ruler and tabToAdd may not be null");
264:
265:                Vector vector = new Vector();
266:
267:                int pos = 0;
268:                boolean added = false;
269:                for (TabStop tab = ruler.firstTab(); tab.getType() != TabStop.kAuto; tab = ruler
270:                        .nextTab(pos)) {
271:                    pos = tab.getPosition();
272:
273:                    if (!added && pos >= tabToAdd.getPosition()) {
274:                        if (pos == tabToAdd.getPosition())
275:                            tab = null;
276:                        vector.addElement(tabToAdd);
277:                        added = true;
278:                    }
279:
280:                    if (tab != null)
281:                        vector.addElement(tab);
282:                }
283:                if (!added)
284:                    vector.addElement(tabToAdd);
285:
286:                return new StandardTabRuler(vector, ruler.autoSpacing());
287:            }
288:
289:            /**
290:             * Return a tab ruler identical to the given ruler, except with the
291:             * given tab removed.
292:             * @param ruler the original ruler.  The MTabRuler will be the same as
293:             *   this except for the removed tab.  <code>ruler</code> is not modified.
294:             * @param position the position of the tab to remove from the new tab ruler
295:             * @return an MTabRuler resulting from this operation
296:             */
297:            /*public*/static MTabRuler removeTabFromRuler(MTabRuler ruler,
298:                    int position) {
299:                if (ruler == null)
300:                    throw new IllegalArgumentException("ruler may not be null");
301:
302:                Vector vector = new Vector();
303:
304:                int pos = 0;
305:                boolean removed = false;
306:                for (TabStop tab = ruler.firstTab(); tab.getType() != TabStop.kAuto; tab = ruler
307:                        .nextTab(pos)) {
308:                    pos = tab.getPosition();
309:
310:                    if (!removed && pos >= position) {
311:                        if (pos == position) {
312:                            removed = true;
313:                            continue; // skip this tab and continue with the remainder
314:                        }
315:                        break; // we didn't remove a tab, but skipped position, so don't bother with the rest
316:                    }
317:
318:                    vector.addElement(tab);
319:                }
320:                if (!removed) // no change
321:                    return ruler;
322:
323:                if (vector.size() == 0)
324:                    return new StandardTabRuler(ruler.autoSpacing());
325:
326:                return new StandardTabRuler(vector, ruler.autoSpacing());
327:            }
328:
329:            /**
330:             * Return a tab ruler identical to the given ruler, except with the
331:             * tab at position <code>fromPosition</code> moved to position
332:             * <code>toPosition</code>.
333:             * @param ruler the original ruler.  The MTabRuler will be the same as
334:             *   this except for the moved tab.  <code>ruler</code> is not modified.
335:             * @param fromPosition the position of the tab to move
336:             * @param toPosition the new position of the tab
337:             * @return an MTabRuler resulting from this operation
338:             */
339:            /*public*/static MTabRuler moveTabOnRuler(MTabRuler ruler,
340:                    int fromPosition, int toPosition) {
341:                if (ruler == null)
342:                    throw new IllegalArgumentException("ruler may not be null");
343:
344:                Vector vector = new Vector();
345:
346:                int pos = 0;
347:                boolean moved = false;
348:                for (TabStop tab = ruler.firstTab(); tab.getType() != TabStop.kAuto; tab = ruler
349:                        .nextTab(pos)) {
350:                    pos = tab.getPosition();
351:
352:                    if (!moved && pos == fromPosition) {
353:                        moved = true;
354:                        tab = new TabStop(toPosition, tab.getType()); // copy it
355:                    }
356:
357:                    vector.addElement(tab);
358:                }
359:                if (!moved) // no change
360:                    return ruler;
361:
362:                return new StandardTabRuler(vector, ruler.autoSpacing());
363:            }
364:
365:        }
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