Source Code Cross Referenced for BooleanDirectSet.java in  » Development » PCJ » bak » pcj » set » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » PCJ » bak.pcj.set 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Primitive Collections for Java.
003:         *  Copyright (C) 2002  Søren Bak
004:         *
005:         *  This library is free software; you can redistribute it and/or
006:         *  modify it under the terms of the GNU Lesser General Public
007:         *  License as published by the Free Software Foundation; either
008:         *  version 2.1 of the License, or (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         *  Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public
016:         *  License along with this library; if not, write to the Free Software
017:         *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         */
019:        package bak.pcj.set;
020:
021:        import bak.pcj.BooleanIterator;
022:        import bak.pcj.BooleanCollection;
023:        import bak.pcj.util.Exceptions;
024:        import java.util.NoSuchElementException;
025:
026:        /**
027:         *  This class represents sets of boolean values. The elements of the
028:         *  set are represented by a single state variable:
029:         *  0 -> {}, 1 -> {F}, 2 -> {T}, and 3 -> {F, T}.
030:         *
031:         *  @author     Søren Bak
032:         *  @version    1.3     21-08-2003 20:22
033:         *  @since      1.0
034:         */
035:        public class BooleanDirectSet extends AbstractBooleanSet {
036:
037:            private int values;
038:
039:            private static final int EMPTY = 0;
040:            private static final int FALSE = 1;
041:            private static final int TRUE = 2;
042:            private static final int FALSETRUE = 3;
043:
044:            /**
045:             *  Creates a new empty set.
046:             */
047:            public BooleanDirectSet() {
048:                values = EMPTY;
049:            }
050:
051:            /**
052:             *  Creates a new set with the same values as a specified
053:             *  collection.
054:             *
055:             *  @param      c
056:             *              the collection whose elements to add to the
057:             *              new set.
058:             *
059:             *  @throws     NullPointerException
060:             *              if <tt>c</tt> is <tt>null</tt>.
061:             */
062:            public BooleanDirectSet(BooleanCollection c) {
063:                this ();
064:                addAll(c);
065:            }
066:
067:            private void removeError() {
068:                Exceptions.noElementToRemove();
069:            }
070:
071:            private void nextError() {
072:                Exceptions.endOfIterator();
073:            }
074:
075:            public boolean contains(boolean v) {
076:                switch (values) {
077:                case EMPTY:
078:                    return false;
079:                case FALSE:
080:                    return !v;
081:                case TRUE:
082:                    return v;
083:                case FALSETRUE:
084:                    return true;
085:                default:
086:                    throw new RuntimeException("Internal error");
087:                }
088:            }
089:
090:            public boolean add(boolean v) {
091:                switch (values) {
092:                case EMPTY:
093:                    if (v)
094:                        values = TRUE;
095:                    else
096:                        values = FALSE;
097:                    return true;
098:                case FALSE:
099:                    if (v) {
100:                        values = FALSETRUE;
101:                        return true;
102:                    }
103:                    return false;
104:                case TRUE:
105:                    if (!v) {
106:                        values = FALSETRUE;
107:                        return true;
108:                    }
109:                    return false;
110:                case FALSETRUE:
111:                    return false;
112:                default:
113:                    throw new RuntimeException("Internal error");
114:                }
115:            }
116:
117:            public boolean remove(boolean v) {
118:                switch (values) {
119:                case EMPTY:
120:                    return false;
121:                case FALSE:
122:                    if (!v) {
123:                        values = EMPTY;
124:                        return true;
125:                    }
126:                    return false;
127:                case TRUE:
128:                    if (v) {
129:                        values = EMPTY;
130:                        return true;
131:                    }
132:                    return false;
133:                case FALSETRUE:
134:                    if (v)
135:                        values = FALSE;
136:                    else
137:                        values = TRUE;
138:                    return true;
139:                default:
140:                    throw new RuntimeException("Internal error");
141:                }
142:            }
143:
144:            public int size() {
145:                switch (values) {
146:                case EMPTY:
147:                    return 0;
148:                case FALSE:
149:                    return 1;
150:                case TRUE:
151:                    return 1;
152:                case FALSETRUE:
153:                    return 2;
154:                default:
155:                    throw new RuntimeException("Internal error");
156:                }
157:            }
158:
159:            public boolean isEmpty() {
160:                return values == EMPTY;
161:            }
162:
163:            public void clear() {
164:                values = EMPTY;
165:            }
166:
167:            public BooleanIterator iterator() {
168:                return new BIterator();
169:            }
170:
171:            private class BIterator implements  BooleanIterator {
172:                private static final int I_EMPTY = 0;
173:                private static final int I_F_0 = 1; // before F
174:                private static final int I_F_1 = 2; // after F
175:                private static final int I_F_2 = 3; // F removed
176:                private static final int I_T_0 = 4; // before T
177:                private static final int I_T_1 = 5; // after T
178:                private static final int I_T_2 = 6; // T removed
179:                private static final int I_FT_0 = 7; // before FT
180:                private static final int I_FT_1 = 8; // between FT
181:                private static final int I_FT_2 = 9; // between FT, F removed
182:                private static final int I_FT_3 = 10; // after FT
183:                private static final int I_FT_4 = 11; // after FT, T removed
184:                private static final int I_FT_5 = 12; // after FT, F removed
185:                private static final int I_FT_6 = 13; // after FT, FT removed
186:
187:                private int state;
188:
189:                BIterator() {
190:                    switch (values) {
191:                    case EMPTY:
192:                        state = I_EMPTY;
193:                        break;
194:                    case FALSE:
195:                        state = I_F_0;
196:                        break;
197:                    case TRUE:
198:                        state = I_T_0;
199:                        break;
200:                    case FALSETRUE:
201:                        state = I_FT_0;
202:                        break;
203:                    default:
204:                        throw new RuntimeException("Internal error");
205:                    }
206:                }
207:
208:                public boolean hasNext() {
209:                    switch (state) {
210:                    case I_EMPTY:
211:                        return false;
212:                    case I_F_0:
213:                        return true;
214:                    case I_F_1:
215:                        return false;
216:                    case I_F_2:
217:                        return false;
218:                    case I_T_0:
219:                        return true;
220:                    case I_T_1:
221:                        return false;
222:                    case I_T_2:
223:                        return false;
224:                    case I_FT_0:
225:                        return true;
226:                    case I_FT_1:
227:                        return true;
228:                    case I_FT_2:
229:                        return true;
230:                    case I_FT_3:
231:                        return false;
232:                    case I_FT_4:
233:                        return false;
234:                    case I_FT_5:
235:                        return false;
236:                    case I_FT_6:
237:                        return false;
238:                    default:
239:                        throw new RuntimeException("Internal error");
240:                    }
241:                }
242:
243:                public boolean next() {
244:                    switch (state) {
245:                    case I_EMPTY:
246:                        nextError();
247:                    case I_F_0:
248:                        state = I_F_1;
249:                        return false;
250:                    case I_F_1:
251:                        nextError();
252:                    case I_F_2:
253:                        nextError();
254:                    case I_T_0:
255:                        state = I_T_1;
256:                        return true;
257:                    case I_T_1:
258:                        nextError();
259:                    case I_T_2:
260:                        nextError();
261:                    case I_FT_0:
262:                        state = I_FT_1;
263:                        return false;
264:                    case I_FT_1:
265:                        state = I_FT_3;
266:                        return true;
267:                    case I_FT_2:
268:                        state = I_FT_5;
269:                        return true;
270:                    case I_FT_3:
271:                        nextError();
272:                    case I_FT_4:
273:                        nextError();
274:                    case I_FT_5:
275:                        nextError();
276:                    case I_FT_6:
277:                        nextError();
278:                    default:
279:                        throw new RuntimeException("Internal error");
280:                    }
281:                }
282:
283:                public void remove() {
284:                    switch (state) {
285:                    case I_EMPTY:
286:                        removeError();
287:                    case I_F_0:
288:                        removeError();
289:                    case I_F_1:
290:                        values = EMPTY;
291:                        state = I_F_2;
292:                        break;
293:                    case I_F_2:
294:                        removeError();
295:                    case I_T_0:
296:                        removeError();
297:                    case I_T_1:
298:                        values = EMPTY;
299:                        state = I_T_2;
300:                        break;
301:                    case I_T_2:
302:                        removeError();
303:                    case I_FT_0:
304:                        removeError();
305:                    case I_FT_1:
306:                        values = TRUE;
307:                        state = I_FT_2;
308:                        break;
309:                    case I_FT_2:
310:                        removeError();
311:                    case I_FT_3:
312:                        values = FALSE;
313:                        state = I_FT_4;
314:                        break;
315:                    case I_FT_4:
316:                        removeError();
317:                    case I_FT_5:
318:                        values = EMPTY;
319:                        state = I_FT_6;
320:                        break;
321:                    case I_FT_6:
322:                        removeError();
323:                    default:
324:                        throw new RuntimeException("Internal error");
325:                    }
326:                }
327:            }
328:
329:        }
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