Source Code Cross Referenced for FileHPIndex.java in  » Search-Engine » mg4j » it » unimi » dsi » mg4j » index » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » mg4j » it.unimi.dsi.mg4j.index 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package it.unimi.dsi.mg4j.index;
002:
003:        /*		 
004:         * MG4J: Managing Gigabytes for Java
005:         *
006:         * Copyright (C) 2007 Sebastiano Vigna 
007:         *
008:         *  This library is free software; you can redistribute it and/or modify it
009:         *  under the terms of the GNU Lesser General Public License as published by the Free
010:         *  Software Foundation; either version 2.1 of the License, or (at your option)
011:         *  any later version.
012:         *
013:         *  This library is distributed in the hope that it will be useful, but
014:         *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
015:         *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
016:         *  for more details.
017:         *
018:         *  You should have received a copy of the GNU Lesser General Public License
019:         *  along with this program; if not, write to the Free Software
020:         *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
021:         *
022:         */
023:
024:        import it.unimi.dsi.fastutil.ints.IntList;
025:        import it.unimi.dsi.fastutil.longs.LongList;
026:        import it.unimi.dsi.mg4j.index.CompressionFlags.Coding;
027:        import it.unimi.dsi.mg4j.index.payload.Payload;
028:        import it.unimi.dsi.io.InputBitStream;
029:        import it.unimi.dsi.util.Properties;
030:        import it.unimi.dsi.util.StringMap;
031:        import it.unimi.dsi.util.PrefixMap;
032:
033:        import java.io.File;
034:        import java.io.FileInputStream;
035:        import java.io.FileNotFoundException;
036:        import java.io.IOException;
037:        import java.io.InputStream;
038:
039:        /** A file-based high-performance index.
040:         *
041:         * <P>An instance of this class stores additional index data for indices
042:         * based on files: for instance, basename, compression flags, etc.
043:         * 
044:         * @author Paolo Boldi
045:         * @author Sebastiano Vigna
046:         * @since 0.9
047:         */
048:
049:        public class FileHPIndex extends BitStreamHPIndex {
050:            private static final long serialVersionUID = 0;
051:
052:            /** The basename of this index. All file names will be stemmed from the basename. It may
053:             * be <code>null</code>. */
054:            public final String basename;
055:            /** The file containing the index. It may be <code>null</code>. */
056:            public final File indexFile;
057:            /** The file containing the positions. It may be <code>null</code>. // TODO: Why ? */
058:            public final File positionsFile;
059:
060:            public FileHPIndex(final String basename,
061:                    final int numberOfDocuments, final int numberOfTerms,
062:                    final long numberOfPostings,
063:                    final long numberOfOccurrences, final int maxCount,
064:                    final Payload payload, final Coding frequencyCoding,
065:                    final Coding pointerCoding, final Coding countCoding,
066:                    final Coding positionCoding, final int quantum,
067:                    final int height, final int bufferSize,
068:                    final TermProcessor termProcessor, final String field,
069:                    final Properties properties,
070:                    final StringMap<? extends CharSequence> termMap,
071:                    final PrefixMap<? extends CharSequence> prefixMap,
072:                    final IntList sizes, final LongList offsets) {
073:                super (numberOfDocuments, numberOfTerms, numberOfPostings,
074:                        numberOfOccurrences, maxCount, payload,
075:                        frequencyCoding, pointerCoding, countCoding,
076:                        positionCoding, quantum, height, bufferSize,
077:                        termProcessor, field, properties, termMap, prefixMap,
078:                        sizes, offsets);
079:                this .basename = basename;
080:                this .indexFile = new File(basename
081:                        + DiskBasedIndex.INDEX_EXTENSION);
082:                this .positionsFile = new File(basename
083:                        + DiskBasedIndex.POSITIONS_EXTENSION);
084:            }
085:
086:            public String toString() {
087:                return this .getClass().getSimpleName() + "(" + basename + ")";
088:            }
089:
090:            @Override
091:            public FileInputStream getInputStream()
092:                    throws FileNotFoundException {
093:                return new FileInputStream(indexFile);
094:            }
095:
096:            @Override
097:            public InputBitStream getInputBitStream(final int bufferSize)
098:                    throws FileNotFoundException {
099:                return new InputBitStream(indexFile, bufferSize);
100:            }
101:
102:            @Override
103:            public InputStream getPositionsInputStream() throws IOException {
104:                return new FileInputStream(positionsFile);
105:            }
106:
107:            @Override
108:            public InputBitStream getPositionsInputBitStream(int bufferSize)
109:                    throws IOException {
110:                return new InputBitStream(positionsFile, bufferSize);
111:            }
112:        }
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