Source Code Cross Referenced for WindowIterator.java in  » Issue-Tracking » scarab-0.21 » org » tigris » scarab » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Issue Tracking » scarab 0.21 » org.tigris.scarab.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.tigris.scarab.util;
002:
003:        /* ================================================================
004:         * Copyright (c) 2000-2002 CollabNet.  All rights reserved.
005:         * 
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions are
008:         * met:
009:         * 
010:         * 1. Redistributions of source code must retain the above copyright
011:         * notice, this list of conditions and the following disclaimer.
012:         * 
013:         * 2. Redistributions in binary form must reproduce the above copyright
014:         * notice, this list of conditions and the following disclaimer in the
015:         * documentation and/or other materials provided with the distribution.
016:         * 
017:         * 3. The end-user documentation included with the redistribution, if
018:         * any, must include the following acknowlegement: "This product includes
019:         * software developed by Collab.Net <http://www.Collab.Net/>."
020:         * Alternately, this acknowlegement may appear in the software itself, if
021:         * and wherever such third-party acknowlegements normally appear.
022:         * 
023:         * 4. The hosted project names must not be used to endorse or promote
024:         * products derived from this software without prior written
025:         * permission. For written permission, please contact info@collab.net.
026:         * 
027:         * 5. Products derived from this software may not use the "Tigris" or 
028:         * "Scarab" names nor may "Tigris" or "Scarab" appear in their names without 
029:         * prior written permission of Collab.Net.
030:         * 
031:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
032:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
033:         * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
034:         * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
035:         * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
036:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
037:         * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
038:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
039:         * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
040:         * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
041:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
042:         *
043:         * ====================================================================
044:         * 
045:         * This software consists of voluntary contributions made by many
046:         * individuals on behalf of Collab.Net.
047:         */
048:
049:        import java.util.Collections;
050:        import java.util.Iterator;
051:        import java.util.NoSuchElementException;
052:
053:        public class WindowIterator implements  Iterator {
054:            public static final WindowIterator EMPTY = new EmptyWindowIterator();
055:            private static final Object NOT_INITIALIZED = new Object();
056:
057:            private final Iterator i;
058:            private final Object[] window;
059:            private final int bsize;
060:            private final int fsize;
061:            private final int size;
062:            private Boolean hasNext;
063:
064:            /**
065:             *
066:             */
067:            public WindowIterator(Iterator i, int backSize, int forwardSize) {
068:                this .i = i;
069:                this .fsize = Math.abs(forwardSize);
070:                this .bsize = Math.abs(backSize);
071:                size = fsize + bsize + 1;
072:                window = new Object[size];
073:
074:                for (int m = 0; m < size; m++) {
075:                    window[m] = NOT_INITIALIZED;
076:                }
077:            }
078:
079:            public boolean hasNext() {
080:                if (hasNext == null) {
081:                    hasNext = (internalIterate()) ? Boolean.TRUE
082:                            : Boolean.FALSE;
083:                }
084:                return hasNext.booleanValue();
085:            }
086:
087:            boolean firstCall = true;
088:
089:            /*
090:            int whatsLeft;
091:            boolean internalIteratorHadNext = true;
092:            private boolean internalIterate()
093:            {
094:                for (int i = 1; i < size; i++) 
095:                {
096:                    window[i-1] = window[i];
097:                }
098:                window[size-1] = NOT_INITIALIZED;
099:
100:                boolean hasNext;
101:                if (internalIteratorHadNext) 
102:                {
103:                    hasNext = i.hasNext();
104:                    internalIteratorHadNext = hasNext; 
105:                    if (hasNext) 
106:                    {
107:                        if (firstCall) 
108:                        {
109:                            for (m = 0; m <= fsize && internalIteratorHadNext; m++) 
110:                            {
111:                                window[bsize + m] = i.next();
112:                                internalIteratorHadNext = i.hasNext();
113:                                whatsLeft++;
114:                            }                    
115:                            firstCall = false;
116:                        }         
117:                        else 
118:                        {
119:                            window[size-1] = i.next();
120:                        }
121:                    }
122:                }
123:                else 
124:                {
125:                    hasNext = (whatsLeft > 0);
126:                    whatsLeft--;
127:                }
128:                
129:                return hasNext;
130:            }
131:             */
132:
133:            private boolean internalIterate() {
134:                if (firstCall) {
135:                    for (int m = 0; m <= fsize && i.hasNext(); m++) {
136:                        window[bsize + m] = i.next();
137:                    }
138:                    firstCall = false;
139:                } else {
140:                    for (int i = 1; i < size; i++) {
141:                        window[i - 1] = window[i];
142:                    }
143:
144:                    if (i.hasNext()) {
145:                        //System.out.println("WindowIterator: i.hasNext = true");
146:                        window[size - 1] = i.next();
147:                    } else {
148:                        //System.out.println("WindowIterator: i.hasNext = false");
149:                        window[size - 1] = NOT_INITIALIZED;
150:                    }
151:                }
152:
153:                return window[bsize] != NOT_INITIALIZED;
154:            }
155:
156:            public Object next() {
157:                if (hasNext()) {
158:                    hasNext = null;
159:                    return window[bsize];
160:                } else {
161:                    throw new NoSuchElementException("Iterator is exhausted"); //EXCEPTION
162:                }
163:            }
164:
165:            public void remove() {
166:                throw new UnsupportedOperationException(
167:                        "'remove' is not implemented"); //EXCEPTION
168:            }
169:
170:            /**
171:             * Allows retrieving a given element some distance relative to the element
172:             * last returned from next(). 
173:             */
174:            public Object get(int i) {
175:                if (i < 0 && (-1 * i) > bsize) {
176:                    throw new ArrayIndexOutOfBoundsException(
177:                            "window was only defined "
178:                                    + bsize
179:                                    + " in the negative direction. Argument was "
180:                                    + i); //EXCEPTION
181:                }
182:
183:                if (i > 0 && i > fsize) {
184:                    throw new ArrayIndexOutOfBoundsException(
185:                            "window was only defined "
186:                                    + fsize
187:                                    + " in the positive direction. Argument was "
188:                                    + i); //EXCEPTION
189:                }
190:
191:                return window[bsize + i];
192:            }
193:
194:            public boolean hasValue(int i) {
195:                return get(i) != NOT_INITIALIZED;
196:            }
197:        }
198:
199:        class EmptyWindowIterator extends WindowIterator {
200:            EmptyWindowIterator() {
201:                super (Collections.EMPTY_SET.iterator(), 0, 0);
202:            }
203:
204:            public boolean hasNext() {
205:                return false;
206:            }
207:
208:            public Object next() {
209:                throw new NoSuchElementException("This is an empty list."); //EXCEPTION
210:            }
211:
212:            public void remove() {
213:                throw new IllegalStateException(
214:                        "next() will throw exception, it is "
215:                                + "not possible to call this method."); //EXCEPTION
216:            }
217:
218:            public Object get(int i) {
219:                throw new NoSuchElementException("This is an empty list."); //EXCEPTION
220:            }
221:
222:            public boolean hasValue(int i) {
223:                return false;
224:            }
225:        }
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