Source Code Cross Referenced for TransliteratingTextComponent.java in  » Internationalization-Localization » icu4j » com » ibm » icu » dev » demo » translit » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.icu.dev.demo.translit 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *******************************************************************************
003:         * Copyright (C) 1996-2004, International Business Machines Corporation and    *
004:         * others. All Rights Reserved.                                                *
005:         *******************************************************************************
006:         */
007:        package com.ibm.icu.dev.demo.translit;
008:
009:        import java.awt.event.*;
010:        import com.ibm.icu.text.*;
011:        import com.ibm.icu.dev.demo.impl.*;
012:
013:        /**
014:         * A subclass of {@link DumbTextComponent} that passes key events through
015:         * a {@link com.ibm.icu.text.Transliterator}.
016:         *
017:         * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.
018:         *
019:         * @author Alan Liu
020:         */
021:        public class TransliteratingTextComponent extends DumbTextComponent {
022:
023:            private static boolean DEBUG = false;
024:
025:            private Transliterator translit = null;
026:
027:            // NOTE: DISABLE THE START AND CURSOR UNTIL WE CAN GET IT TO WORK AT ALL
028:
029:            // Index into getText() where the start of transliteration is.
030:            // As we commit text during transliteration, we advance
031:            // this.
032:            //private int start = 0;
033:
034:            // Index into getText() where the cursor is; cursor >= start
035:            //private int cursor = 0;
036:
037:            private static final String COPYRIGHT = "\u00A9 IBM Corporation 1999. All rights reserved.";
038:
039:            /**
040:             * Constructor.
041:             */
042:            public TransliteratingTextComponent() {
043:                super ();
044:                /*
045:                addActionListener(new ActionListener() {
046:                    public void actionPerformed(ActionEvent e) {
047:                        // We get an ActionEvent only when the selection changes
048:                        resetTransliterationStart();
049:                    }
050:                });
051:                 */
052:            }
053:
054:            /**
055:             * {@link DumbTextComponent} API.  Framework method that is called
056:             * when a <code>KeyEvent</code> is received.  This implementation
057:             * runs the new character through the current
058:             * <code>Transliterator</code>, if one is set, and inserts the
059:             * transliterated text into the buffer.
060:             */
061:            protected void handleKeyTyped(KeyEvent e) {
062:                char ch = e.getKeyChar();
063:
064:                if (translit == null) {
065:                    setKeyStart(-1);
066:                    super .handleKeyTyped(e);
067:                    return;
068:                }
069:
070:                transliterate(ch, false);
071:            }
072:
073:            public void flush() {
074:                if (translit != null)
075:                    transliterate('\uFFFF', true);
076:            }
077:
078:            protected void transliterate(char ch, boolean flush) {
079:
080:                // ------------------------------------------------------------
081:                // The following case motivates the two lines that recompute
082:                // start and cursor below.
083:
084:                //      "     "   
085:                // a b c q r|s t u m m
086:                // 0 1 2 3 4 5 6 7 8 9
087:                //       0 1 2
088:
089:                // start 3, cursor 5, sel 6 -> { 0, 3, 2 }
090:                // : new int[] { 0, sel - start, cursor - start };
091:
092:                // sz>99|9
093:
094:                //      "     {   "
095:                // a b c q r 9 9|9 t u m m
096:                // 0 1 2 3 4 5 6 7 8 9 a b
097:                //       0 1 2 3 4
098:
099:                // { 3, 5, 4 } -> start 6, cursor 7, sel 8
100:                // : start += index[0];
101:                // : cursor = start + index[2] - index[0];
102:                // ------------------------------------------------------------
103:
104:                // Need to save start because calls to replaceRange will update
105:                // start and cursor.
106:                //int saveStart = start;
107:
108:                int end = flush ? getSelectionEnd() : getSelectionStart();
109:                String sourceText = getText().substring(0, end);
110:                ReplaceableString buf = new ReplaceableString(sourceText);
111:                /*buf.replace(0, 1, getText().substring(start,
112:                                                      getSelectionStart()));*/
113:
114:                Transliterator.Position index = new Transliterator.Position();
115:                index.contextLimit = buf.length();
116:                index.contextStart = 0;
117:                index.start = getKeyStart();
118:                if (index.start == -1)
119:                    index.start = getSelectionStart();
120:                index.limit = buf.length();
121:
122:                //  StringBuffer log = null;
123:                if (DEBUG) {
124:                    System.out.println("Transliterator: " + translit.getID());
125:                    System.out.println("From:\t" + '"' + buf.toString() + '"'
126:                            + "; {cs: " + index.contextStart + ", s: "
127:                            + index.start + ", l: " + index.limit + ", cl: "
128:                            + index.contextLimit + "}" + "; '" + ch + "'" + " "
129:                            + getKeyStart());
130:                }
131:
132:                if (flush) {
133:                    translit.finishTransliteration(buf, index);
134:                } else {
135:                    translit.transliterate(buf, index, ch);
136:                }
137:
138:                if (DEBUG) {
139:                    System.out.println("To:\t" + '"' + buf.toString() + '"'
140:                            + "; {cs: " + index.contextStart + ", s: "
141:                            + index.start + ", l: " + index.limit + ", cl: "
142:                            + index.contextLimit + "}");
143:                    System.out.println();
144:                }
145:                /*
146:                buf.replace(buf.length(), buf.length(), String.valueOf(ch));
147:                translit.transliterate(buf);
148:                 */
149:
150:                String result = buf.toString();
151:                //if (result.equals(sourceText + ch)) return;
152:
153:                replaceRange(result, 0, getSelectionEnd());
154:                setKeyStart(index.start);
155:
156:                // At this point start has been changed by the callback to
157:                // resetTransliteratorStart() via replaceRange() -- so use our
158:                // local copy, saveStart.
159:
160:                // The START index is zero-based.  On entry to transliterate(),
161:                // it was zero.  We can therefore just add it to our original
162:                // getText()-based index value of start (in saveStart) to get
163:                // the new getText()-based start.
164:                //        start = saveStart + index.contextStart;
165:
166:                // Make the cursor getText()-based.  The CURSOR index is zero-based.
167:                //        cursor = start + index.start - index.contextStart;
168:
169:                /*
170:                 if (DEBUG) {
171:                 String out = buf.toString();
172:                 log.append(out.substring(0, index.contextStart)).
173:                 append('{').
174:                 append(out.substring(index.contextStart, index.start)).
175:                 append('|').
176:                 append(out.substring(index.start)).
177:                 append('"');
178:                 log.append(", {" + index.contextStart + ", " + index.contextLimit + ", " + index.start + "}, ");
179:                 //            log.append("start " + start + ", cursor " + cursor);
180:                 log.append(", sel " + getSelectionStart());
181:                 System.out.println(escape(log.toString()));
182:                 }
183:                 */
184:            }
185:
186:            /**
187:             * Set the {@link com.ibm.icu.text.Transliterator} and direction to
188:             * use to process incoming <code>KeyEvent</code>s.
189:             * @param t the {@link com.ibm.icu.text.Transliterator} to use
190:             */
191:            public void setTransliterator(Transliterator t) {
192:                /*
193:                if (translit != t) { // [sic] pointer compare ok; singletons
194:                    resetTransliterationStart();
195:                }
196:                 */
197:                translit = t;
198:            }
199:
200:            public Transliterator getTransliterator() {
201:                return translit;
202:            }
203:
204:            /**
205:             * Reset the start point at which transliteration begins.  This
206:             * needs to be done when the user moves the cursor or when the
207:             * current {@link com.ibm.icu.text.Transliterator} is changed. 
208:             */
209:            /*
210:            private void resetTransliterationStart() {
211:               start = getSelectionStart();
212:               cursor = start;
213:            }
214:             */
215:
216:            /**
217:             * Escape non-ASCII characters as Unicode.
218:             * JUST FOR DEBUGGING OUTPUT.
219:             */
220:            public static final String escape(String s) {
221:                StringBuffer buf = new StringBuffer();
222:                for (int i = 0; i < s.length(); ++i) {
223:                    char c = s.charAt(i);
224:                    if (c >= ' ' && c <= 0x007F) {
225:                        if (c == '\\') {
226:                            buf.append("\\\\"); // That is, "\\"
227:                        } else {
228:                            buf.append(c);
229:                        }
230:                    } else {
231:                        buf.append("\\u");
232:                        if (c < 0x1000) {
233:                            buf.append('0');
234:                            if (c < 0x100) {
235:                                buf.append('0');
236:                                if (c < 0x10) {
237:                                    buf.append('0');
238:                                }
239:                            }
240:                        }
241:                        buf.append(Integer.toHexString(c));
242:                    }
243:                }
244:                return buf.toString();
245:            }
246:        }
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