Source Code Cross Referenced for SkipList.java in  » Database-DBMS » BlockFile » net » metanotion » util » skiplist » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » BlockFile » net.metanotion.util.skiplist 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:        Copyright (c) 2006, Matthew Estes
003:        All rights reserved.
004:
005:        Redistribution and use in source and binary forms, with or without
006:        modification, are permitted provided that the following conditions are met:
007:
008:         * Redistributions of source code must retain the above copyright
009:        notice, this list of conditions and the following disclaimer.
010:         * Redistributions in binary form must reproduce the above copyright
011:        notice, this list of conditions and the following disclaimer in the
012:        documentation and/or other materials provided with the distribution.
013:         * Neither the name of Metanotion Software nor the names of its
014:        contributors may be used to endorse or promote products derived from this
015:        software without specific prior written permission.
016:
017:        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
018:        IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
019:        THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
020:        PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
021:        CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
022:        EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
023:        PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
024:        PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
025:        LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
026:        NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
027:        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028:         */
029:        package net.metanotion.util.skiplist;
030:
031:        import java.util.Random;
032:
033:        public class SkipList {
034:            protected SkipSpan first;
035:            protected SkipLevels stack;
036:            public Random rng;
037:
038:            public int size = 0;
039:            public int spans = 0;
040:
041:            public void flush() {
042:            }
043:
044:            protected SkipList() {
045:            }
046:
047:            public SkipList(int span) {
048:                if (span < 1) {
049:                    throw new Error("Span size too small");
050:                }
051:                first = new SkipSpan(span);
052:                stack = new SkipLevels(1, first);
053:                spans = 1;
054:                rng = new Random(System.currentTimeMillis());
055:            }
056:
057:            public int size() {
058:                return size;
059:            }
060:
061:            public int maxLevels() {
062:                int hob = 0, s = spans;
063:                while (spans > 0) {
064:                    hob++;
065:                    spans = spans / 2;
066:                }
067:                return (hob > 4) ? hob : 4;
068:            }
069:
070:            public int generateColHeight() {
071:                int bits = rng.nextInt();
072:                boolean cont = true;
073:                int res = 0;
074:                for (res = 0; cont; res++) {
075:                    cont = ((bits % 2) == 0) ? true : false;
076:                    bits = bits / 2;
077:                }
078:                return Math.max(0, Math.min(res, maxLevels()));
079:            }
080:
081:            public void put(Comparable key, Object val) {
082:                if (key == null) {
083:                    throw new NullPointerException();
084:                }
085:                if (val == null) {
086:                    throw new NullPointerException();
087:                }
088:                SkipLevels slvls = stack.put(stack.levels.length - 1, key, val,
089:                        this );
090:                if (slvls != null) {
091:                    SkipLevels[] levels = new SkipLevels[slvls.levels.length];
092:                    for (int i = 0; i < slvls.levels.length; i++) {
093:                        if (i < stack.levels.length) {
094:                            levels[i] = stack.levels[i];
095:                        } else {
096:                            levels[i] = slvls;
097:                        }
098:                    }
099:                    stack.levels = levels;
100:                    stack.flush();
101:                    flush();
102:                }
103:            }
104:
105:            public Object remove(Comparable key) {
106:                if (key == null) {
107:                    throw new NullPointerException();
108:                }
109:                Object[] res = stack.remove(stack.levels.length - 1, key, this );
110:                if (res != null) {
111:                    if (res[1] != null) {
112:                        SkipLevels slvls = (SkipLevels) res[1];
113:                        for (int i = 0; i < slvls.levels.length; i++) {
114:                            if (stack.levels[i] == slvls) {
115:                                stack.levels[i] = slvls.levels[i];
116:                            }
117:                        }
118:                        stack.flush();
119:                    }
120:                    flush();
121:                    return res[0];
122:                }
123:                return null;
124:            }
125:
126:            public void printSL() {
127:                System.out.println("List size " + size + " spans " + spans);
128:                stack.print();
129:            }
130:
131:            public void print() {
132:                System.out.println("List size " + size + " spans " + spans);
133:                first.print();
134:            }
135:
136:            public Object get(Comparable key) {
137:                if (key == null) {
138:                    throw new NullPointerException();
139:                }
140:                return stack.get(stack.levels.length - 1, key);
141:            }
142:
143:            public SkipIterator iterator() {
144:                return new SkipIterator(first, 0);
145:            }
146:
147:            public SkipIterator min() {
148:                return new SkipIterator(first, 0);
149:            }
150:
151:            public SkipIterator max() {
152:                SkipSpan ss = stack.getEnd();
153:                return new SkipIterator(ss, ss.nKeys - 1);
154:            }
155:
156:            public SkipIterator find(Comparable key) {
157:                int[] search = new int[1];
158:                SkipSpan ss = stack.getSpan(stack.levels.length - 1, key,
159:                        search);
160:                if (search[0] < 0) {
161:                    search[0] = -1 * (search[0] + 1);
162:                }
163:                return new SkipIterator(ss, search[0]);
164:            }
165:
166:            // Levels adjusted to guarantee O(log n) search
167:            // This is expensive proportional to the number of spans.
168:            public void balance() {
169:                // TODO Skip List Balancing Algorithm
170:            }
171:
172:            /*
173:             Basic Error generating conditions to test
174:             insert into empty
175:             insert into non empty
176:             remove from empty
177:             remove from non-empty a non-existant key
178:             get from empty
179:             get from non-empty a non-existant key
180:
181:             Repeat, with splits induced, and collapse induced.
182:             */
183:            public static void main(String args[]) {
184:                SkipList sl = new SkipList(3);
185:                sl.put(".1", "1");
186:                sl.remove("2");
187:                sl.remove("1");
188:                sl.put(".1", "1-1");
189:                sl.put(".2", "2");
190:                sl.put(".3", "3");
191:                /*		System.out.println("\n#1");
192:                 sl.print();
193:                 */
194:
195:                sl.put(".4", "4");
196:                /*		System.out.println("\n#2");
197:                 sl.print();
198:
199:                 sl.remove("1");
200:                 System.out.println("\n#2.1");
201:                 sl.print();
202:                 sl.remove("2");
203:                 System.out.println("\n#2.2");
204:                 sl.print();
205:                 sl.remove("3");
206:                 System.out.println("\n#2.3");
207:                 sl.print();
208:                 sl.remove("4");
209:
210:                 System.out.println("\n#3");
211:                 sl.print();
212:                 */
213:                sl.put(".1", "1-2");
214:                sl.put(".2", "2-1");
215:                sl.put(".3", "3-1");
216:                sl.put(".4", "4-1");
217:                //		System.out.println("\n#4");
218:                //		sl.print();
219:                sl.put(".5", "5-1");
220:                sl.put(".6", "6-1");
221:                sl.put(".7", "7-1");
222:
223:                //		System.out.println("\n#5");
224:                //		sl.print();
225:
226:                //		sl.remove("5");
227:                sl.put(".5", "5-2");
228:                //		System.out.println("\n#6");
229:                //		sl.print();
230:
231:                sl.put(".8", "8");
232:                sl.put(".9", "9");
233:                sl.put("10", "10");
234:                sl.put("11", "11");
235:                sl.put("12", "12");
236:                sl.put("13", "13");
237:                sl.put("14", "14");
238:                sl.put("15", "15");
239:                sl.put("16", "16");
240:                sl.put("17", "17");
241:                sl.put("18", "18");
242:                sl.put("19", "19");
243:                sl.put("20", "20");
244:                sl.put("21", "21");
245:                sl.put("22", "22");
246:                sl.put("23", "23");
247:                sl.put("24", "24");
248:                sl.put("25", "25");
249:                sl.put("26", "26");
250:                sl.put("27", "27");
251:                sl.put("28", "28");
252:                sl.put("29", "29");
253:                sl.put("30", "30");
254:                sl.put("31", "31");
255:                sl.put("32", "32");
256:                sl.put("33", "33");
257:                sl.put("34", "34");
258:                sl.put("35", "35");
259:                sl.put("36", "36");
260:                sl.put("37", "37");
261:                sl.put("38", "38");
262:                sl.put("39", "39");
263:                sl.put("40", "40");
264:
265:                //		System.out.println("\n#7");
266:                //		sl.print();
267:                System.out.println("GET " + sl.get("10"));
268:                System.out.println("GET " + sl.get("12"));
269:                System.out.println("GET " + sl.get("32"));
270:                System.out.println("GET " + sl.get("33"));
271:                System.out.println("GET " + sl.get("37"));
272:                System.out.println("GET " + sl.get("40"));
273:
274:                sl.printSL();
275:
276:                sl.remove("33");
277:                sl.printSL();
278:                sl.remove("34");
279:                sl.printSL();
280:                sl.remove("36");
281:                sl.printSL();
282:                sl.remove("35");
283:                sl.printSL();
284:
285:                //		System.out.println("\n#8");
286:                sl.print();
287:                System.out.println("GET " + sl.get("10"));
288:                System.out.println("GET " + sl.get("12"));
289:                System.out.println("GET " + sl.get("32"));
290:                System.out.println("GET " + sl.get("33"));
291:                System.out.println("GET " + sl.get("37"));
292:                System.out.println("GET " + sl.get("40"));
293:
294:                System.out.println("Height " + sl.stack.levels.length);
295:
296:                SkipIterator si = sl.iterator();
297:                for (int i = 0; i < 5; i++) {
298:                    System.out.println("Iterator: " + si.next());
299:                }
300:                for (int i = 0; i < 3; i++) {
301:                    System.out.println("Iterator: " + si.previous());
302:                }
303:
304:                System.out.println("Find 10");
305:                si = sl.find("10");
306:                for (int i = 0; i < 5; i++) {
307:                    System.out.println("Iterator: " + si.next());
308:                }
309:                for (int i = 0; i < 3; i++) {
310:                    System.out.println("Iterator: " + si.previous());
311:                }
312:
313:                System.out.println("Find 34");
314:                si = sl.find("34");
315:                for (int i = 0; i < 3; i++) {
316:                    System.out.println("Iterator: " + si.previous());
317:                }
318:                for (int i = 0; i < 5; i++) {
319:                    System.out.println("Iterator: " + si.next());
320:                }
321:
322:                System.out.println("Max");
323:                si = sl.max();
324:                for (int i = 0; i < 3; i++) {
325:                    System.out.println("Iterator: " + si.previous());
326:                }
327:                for (int i = 0; i < 5; i++) {
328:                    System.out.println("Iterator: " + si.next());
329:                }
330:            }
331:        }
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