Source Code Cross Referenced for ObjectArrayIndex.java in  » Database-DBMS » axion » org » axiondb » engine » indexes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb.engine.indexes 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: ObjectArrayIndex.java,v 1.4 2005/03/12 02:10:41 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2002-2005 Axion Development Team.  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 
008:         * are met:
009:         * 
010:         * 1. Redistributions of source code must retain the above 
011:         *    copyright notice, this list of conditions and the following 
012:         *    disclaimer. 
013:         *   
014:         * 2. Redistributions in binary form must reproduce the above copyright 
015:         *    notice, this list of conditions and the following disclaimer in 
016:         *    the documentation and/or other materials provided with the 
017:         *    distribution. 
018:         *   
019:         * 3. The names "Tigris", "Axion", nor the names of its contributors may 
020:         *    not be used to endorse or promote products derived from this 
021:         *    software without specific prior written permission. 
022:         *  
023:         * 4. Products derived from this software may not be called "Axion", nor 
024:         *    may "Tigris" or "Axion" appear in their names without specific prior
025:         *    written permission.
026:         *   
027:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
028:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
029:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030:         * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
031:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
032:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
033:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
034:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
035:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
036:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
037:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038:         * =======================================================================
039:         */
040:
041:        package org.axiondb.engine.indexes;
042:
043:        import java.util.ArrayList;
044:        import java.util.List;
045:
046:        import org.apache.commons.collections.primitives.IntList;
047:        import org.axiondb.AxionException;
048:        import org.axiondb.Column;
049:        import org.axiondb.IndexLoader;
050:        import org.axiondb.engine.ObjectArrayIndexLoader;
051:
052:        /**
053:         * An {@link BaseArrayIndex index}over <code>Object</code> keys.
054:         * 
055:         * @version $Revision: 1.4 $ $Date: 2005/03/12 02:10:41 $
056:         * @author Rodney Waldhoff
057:         */
058:        public class ObjectArrayIndex extends BaseArrayIndex {
059:
060:            public ObjectArrayIndex(String name, Column column, boolean unique) {
061:                super (name, column, unique);
062:                _keys = new ArrayList();
063:            }
064:
065:            public ObjectArrayIndex(String name, Column column, boolean unique,
066:                    ArrayList keys, IntList values) {
067:                super (name, column, unique, values);
068:                _keys = keys;
069:            }
070:
071:            public IndexLoader getIndexLoader() {
072:                return LOADER;
073:            }
074:
075:            public List getKeyList() {
076:                return _keys;
077:            }
078:
079:            public void truncate() throws AxionException {
080:                super .truncate();
081:                if (_keys != null) {
082:                    _keys.clear();
083:                }
084:            }
085:
086:            protected int find(Object seeking, boolean required) {
087:                int high = _keys.size();
088:                int low = 0;
089:                int cur = 0;
090:                boolean found = false;
091:                while (low < high) {
092:                    cur = (high + low) / 2;
093:                    int comp = getComparator().compare(seeking, _keys.get(cur));
094:                    if (0 == comp) {
095:                        found = true;
096:                        break;
097:                    } else if (comp < 0) {
098:                        high = cur;
099:                    } else { // if(comp > 0)
100:                        if (low == cur) {
101:                            cur++;
102:                        }
103:                        low = cur;
104:                    }
105:                }
106:                if (!isUnique()) {
107:                    while (cur > 0
108:                            && getComparator().compare(seeking,
109:                                    _keys.get(cur - 1)) == 0) {
110:                        cur--;
111:                    }
112:                }
113:                if (!found) {
114:                    return required ? -1 : cur;
115:                }
116:                return cur;
117:            }
118:
119:            protected List getKeyList(int minIndex, int maxIndex) {
120:                return _keys.subList(minIndex, maxIndex);
121:            }
122:
123:            protected int insertKey(Object seeking) throws AxionException {
124:                int high = _keys.size();
125:                int low = 0;
126:                int cur = 0;
127:                while (low < high) {
128:                    cur = (high + low) / 2;
129:                    int comp = getComparator().compare(seeking, _keys.get(cur));
130:                    if (0 == comp) {
131:                        if (isUnique()) {
132:                            throw new AxionException("Expected "
133:                                    + getIndexedColumn()
134:                                    + " to be unique, found " + seeking
135:                                    + " already.");
136:                        }
137:                        break;
138:                    } else if (comp < 0) {
139:                        high = cur;
140:                    } else { // if(comp > 0)
141:                        if (low == cur) {
142:                            cur++;
143:                        }
144:                        low = cur;
145:                    }
146:                }
147:                _keys.add(cur, seeking);
148:                return cur;
149:            }
150:
151:            protected int removeKey(Comparable seeking) throws AxionException {
152:                int index = find(seeking, true);
153:                if (-1 != index) {
154:                    _keys.remove(index);
155:                }
156:                return index;
157:            }
158:
159:            protected int removeKey(Object value) throws AxionException {
160:                return removeKey((Comparable) value);
161:            }
162:
163:            protected void removeKeyAt(int index) throws AxionException {
164:                _keys.remove(index);
165:            }
166:
167:            private static final IndexLoader LOADER = new ObjectArrayIndexLoader();
168:
169:            private ArrayList _keys = null;
170:        }
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