Source Code Cross Referenced for SimpleVector.java in  » Scripting » Nice » gnu » lists » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Nice » gnu.lists 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // -*-Java-*-
002:        // Copyright (c) 2001  Per M.A. Bothner and Brainfood Inc.
003:        // This is free software;  for terms and warranty disclaimer see ./COPYING.
004:
005:        package gnu.lists;
006:
007:        import java.util.*;
008:
009:        /** A SimpleVector implement as a simple array plus a current size.
010:         *
011:         * Methods with the word "Buffer" are methods which use the underlying
012:         * array, ignoring the 'size' field.
013:         *
014:         * Can be used to implement CommonLisp simple vectors, but all simple
015:         * vectors are also adjustable (by re-allocating the buffer)
016:         * and have a fill pointer (the size field). */
017:
018:        public abstract class SimpleVector extends AbstractSequence implements 
019:                Sequence {
020:            /** The (current) number of elements.
021:             * Must always have size() >= 0 && size() <= getBufferLength(). */
022:            public int size;
023:
024:            public final int size() {
025:                return size;
026:            }
027:
028:            /**
029:             * Set the size to a specified value.
030:             * The data buffer is grown if needed, with new elements set to zero/null. If
031:             * size is less than the current value, removed values are set to zero/null..
032:             * (This is because if you decrease and then increase the vector the
033:             * should be zero/null, and it is cleaner and better for gc to do the
034:             * zeroing/nulling on remove rather than add.)
035:             * If you need to change the size without setting removed elements to
036:             * zero/null (e.g. to change Common Lisp's fill pointer) set size directly.
037:             */
038:            public void setSize(int size) {
039:                int oldSize = this .size;
040:                this .size = size;
041:                if (size < oldSize)
042:                    clearBuffer(size, oldSize - size);
043:                else {
044:                    int oldLength = getBufferLength();
045:                    if (size > oldLength) {
046:                        int newLength = oldLength < 16 ? 16 : 2 * oldLength;
047:                        setBufferLength(size > newLength ? size : newLength);
048:                    }
049:                }
050:            }
051:
052:            /** Get the allocated length of the data buffer. */
053:            public abstract int getBufferLength();
054:
055:            public abstract void setBufferLength(int length);
056:
057:            protected boolean isAfter(int ipos, Object xpos) {
058:                return (ipos & 1) != 0;
059:            }
060:
061:            protected int nextIndex(int ipos, Object xpos) {
062:                return ipos >>> 1;
063:            }
064:
065:            public void makePosition(int index, boolean isAfter,
066:                    PositionContainer posSet, int posNumber) {
067:                posSet.setPosition(posNumber, (index << 1) | (isAfter ? 1 : 0),
068:                        null);
069:                posSet.setSequence(posNumber, this );
070:            }
071:
072:            /*
073:            protected void ensureSize(int space)
074:            {
075:              int oldLength = data.length;
076:              int newLength = size +
077:              if (size > space)
078:                setBufferLength(space < 16 ? 16 : 2 * space);
079:              this.size = size;
080:            }
081:             */
082:
083:            protected abstract Object getBuffer();
084:
085:            public Object get(int index) {
086:                if (index >= size)
087:                    throw new IndexOutOfBoundsException();
088:                return getBuffer(index);
089:            }
090:
091:            protected Object getNext(int ipos, Object xpos) {
092:                int index = ipos >>> 1;
093:                return index >= size ? eofValue : getBuffer(index);
094:            }
095:
096:            public int intAtBuffer(int index) {
097:                return Convert.toInt(getBuffer(index));
098:            }
099:
100:            public int intAt(int index) {
101:                if (index >= size)
102:                    throw new IndexOutOfBoundsException();
103:                return intAtBuffer(index);
104:            }
105:
106:            public long longAt(int index) {
107:                if (index >= size)
108:                    throw new IndexOutOfBoundsException();
109:                return longAtBuffer(index);
110:            }
111:
112:            public long longAtBuffer(int index) {
113:                return Convert.toLong(getBuffer(index));
114:            }
115:
116:            protected abstract Object getBuffer(int index);
117:
118:            public Object set(int index, Object value) {
119:                if (index >= size)
120:                    throw new IndexOutOfBoundsException();
121:                Object old = getBuffer(index);
122:                setBuffer(index, value);
123:                return old;
124:            }
125:
126:            protected abstract Object setBuffer(int index, Object value);
127:
128:            public void fill(Object value) {
129:                for (int i = size; --i >= 0;)
130:                    setBuffer(i, value);
131:            }
132:
133:            public void fill(int fromIndex, int toIndex, Object value) {
134:                if (fromIndex < 0 || toIndex > size)
135:                    throw new IndexOutOfBoundsException();
136:                for (int i = fromIndex; i < toIndex; i++)
137:                    setBuffer(i, value);
138:            }
139:
140:            public void shift(int srcStart, int dstStart, int count) {
141:                Object data = getBuffer();
142:                System.arraycopy(data, srcStart, data, dstStart, count);
143:            }
144:
145:            public boolean add(Object o) {
146:                add(size, o);
147:                return true;
148:            }
149:
150:            protected void add(PositionContainer posSet, int posNumber,
151:                    Object value) {
152:                int ipos = posSet.getPositionInt(posNumber);
153:                add(ipos >>> 1, value);
154:                posSet.setPosition(posNumber, ipos + 2, null);
155:            }
156:
157:            public void add(int index, Object o) {
158:                int newSize = size + 1;
159:                size = newSize;
160:                int length = getBufferLength();
161:                if (newSize > length)
162:                    setBufferLength(length < 16 ? 16 : 2 * length);
163:                this .size = newSize;
164:                if (size != index)
165:                    shift(index, index + 1, size - index);
166:                set(index, o);
167:            }
168:
169:            public boolean addAll(int index, Collection c) {
170:                boolean changed = false;
171:                int count = c.size();
172:                setSize(size + count);
173:                shift(index, index + count, size - count - index);
174:                for (Iterator it = c.iterator(); it.hasNext();) {
175:                    set(index++, it.next());
176:                    changed = true;
177:                }
178:                return changed;
179:            }
180:
181:            protected abstract void clearBuffer(int start, int count);
182:
183:            protected void remove(int ipos0, Object xpos0, int ipos1,
184:                    Object xpos1) {
185:                ipos0 = ipos0 >>> 1;
186:                ipos1 = ipos1 >>> 1;
187:                if (ipos0 < 0 || ipos0 > ipos1 || ipos1 >= size)
188:                    throw new IndexOutOfBoundsException();
189:                shift(ipos1, ipos0, size - ipos1);
190:                int count = ipos1 - ipos0;
191:                size = size - count;
192:                clearBuffer(size, count);
193:            }
194:
195:            protected void remove(int ipos, Object xpos, int count) {
196:                int index = ipos >>> 1;
197:                int ipos0, ipos1;
198:                if (count >= 0) {
199:                    ipos0 = index;
200:                    ipos1 = index + count;
201:                } else {
202:                    ipos0 = index + count;
203:                    ipos1 = index;
204:                    count = -count;
205:                }
206:                if (ipos0 < 0 || ipos1 >= size)
207:                    throw new IndexOutOfBoundsException();
208:                shift(ipos1, ipos0, size - ipos1);
209:                size = size - count;
210:                clearBuffer(size, count);
211:            }
212:
213:            public Object remove(int index) {
214:                if (index < 0 || index >= size)
215:                    throw new IndexOutOfBoundsException();
216:                Object result = get(index);
217:                shift(index + 1, index, 1);
218:                size = size - 1;
219:                clearBuffer(size, 1);
220:                return result;
221:            }
222:
223:            public boolean remove(Object o) {
224:                int index = indexOf(o);
225:                if (index < 0)
226:                    return false;
227:                Object result = get(index);
228:                shift(index + 1, index, 1);
229:                size = size - 1;
230:                clearBuffer(size, 1);
231:                return true;
232:            }
233:
234:            public boolean removeAll(Collection c) {
235:                boolean changed = false;
236:                int j = 0;
237:                for (int i = 0; i < size; i++) {
238:                    Object value = get(i);
239:                    if (c.contains(value)) {
240:                        changed = true;
241:                    } else {
242:                        if (changed)
243:                            set(j, value);
244:                        j++;
245:                    }
246:                }
247:                setSize(j);
248:                return changed;
249:            }
250:
251:            public boolean retainAll(Collection c) {
252:                boolean changed = false;
253:                int j = 0;
254:                for (int i = 0; i < size; i++) {
255:                    Object value = get(i);
256:                    if (!c.contains(value)) {
257:                        changed = true;
258:                    } else {
259:                        if (changed)
260:                            set(j, value);
261:                        j++;
262:                    }
263:                }
264:                setSize(j);
265:                return changed;
266:            }
267:
268:            public void clear() {
269:                setSize(0);
270:            }
271:
272:            /** This is convenience hack for printing "uniform vectors" (srfi 4).
273:             * It may go away without notice! */
274:            public String getTag() {
275:                return null;
276:            }
277:
278:            public void consume(int start, int length, Consumer out) {
279:                consume(start << 1, null, (start + length) << 1, null, out);
280:            }
281:
282:            public boolean consumeNext(int ipos, Object xpos, Consumer out) {
283:                int index = ipos >>> 1;
284:                if (index >= size)
285:                    return false;
286:                out.writeObject(getBuffer(index));
287:                return true;
288:            }
289:
290:            protected void consume(int iposStart, Object xposStart,
291:                    int iposEnd, Object xposEnd, Consumer out) {
292:                if (out.ignoring())
293:                    return;
294:                int i = iposStart >>> 1;
295:                int end = iposEnd >>> 1;
296:                for (; i < end; i++)
297:                    out.writeObject(getBuffer(i));
298:            }
299:
300:            public int getNextKind(int ipos, Object xpos) {
301:                return hasNext(ipos, xpos) ? getElementKind() : EOF_VALUE;
302:            }
303:
304:            public int getElementKind() {
305:                return OBJECT_VALUE;
306:            }
307:        }
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