[15325] | 1 | /*
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| 2 | * SimpleCollectionDatabase.java
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| 3 | * Copyright (C) 2008 New Zealand Digital Library, http://www.nzdl.org
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation; either version 2 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 18 | */
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| 19 | package org.greenstone.gsdl3.util;
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| 20 |
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[24393] | 21 | import java.util.Iterator;
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| 22 | import java.util.Set;
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| 23 | import java.util.Vector;
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| 24 |
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[15325] | 25 | import org.apache.log4j.*;
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| 26 |
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[23791] | 27 | import org.apache.commons.lang3.StringUtils;
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| 28 |
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[24393] | 29 | public class SimpleCollectionDatabase implements OID.OIDTranslatable
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| 30 | {
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[15325] | 31 |
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[24393] | 32 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.util.SimpleCollectionDatabase.class.getName());
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[22973] | 33 |
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[24393] | 34 | /* just read access, many readers can share a database */
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| 35 | public final static int READ = FlatDatabaseWrapper.READ;
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| 36 | /* read/write, exclusive access */
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| 37 | public final static int WRITE = FlatDatabaseWrapper.WRITE;
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[22973] | 38 |
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[24393] | 39 | protected FlatDatabaseWrapper coll_db = null;
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[22973] | 40 |
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[24393] | 41 | public SimpleCollectionDatabase(String db_type)
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| 42 | {
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[22973] | 43 |
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[24393] | 44 | // Access databaseWrapper through reflection (forName) so code
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| 45 | // can be more dynamic as to the database backends that are
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| 46 | // supported for this installation of Greenstone
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[22973] | 47 |
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[24393] | 48 | String dbwrap_name = db_type.toUpperCase() + "Wrapper";
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| 49 | Class dbwrap_class = null;
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[22973] | 50 |
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[24393] | 51 | try
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| 52 | {
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| 53 | String full_dbwrap_name = "org.greenstone.gsdl3.util." + dbwrap_name;
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| 54 | dbwrap_class = Class.forName(full_dbwrap_name);
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| 55 | }
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| 56 | catch (ClassNotFoundException e)
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| 57 | {
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| 58 | try
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| 59 | {
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| 60 | //try the dbwrap_name alone in case the package name is
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| 61 | //already specified
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| 62 | dbwrap_class = Class.forName(dbwrap_name);
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| 63 | }
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| 64 | catch (ClassNotFoundException ae)
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| 65 | {
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| 66 | logger.error("Couldn't create SimpleCollectionDatabase of type " + db_type);
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| 67 | logger.info(ae.getMessage());
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| 68 | }
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| 69 | }
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[22973] | 70 |
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[24393] | 71 | try
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| 72 | {
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| 73 | this.coll_db = (FlatDatabaseWrapper) dbwrap_class.newInstance();
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| 74 | }
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| 75 | catch (Exception e)
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| 76 | {
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| 77 | logger.error("Failed to call the constructor " + dbwrap_name + "()");
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| 78 | }
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[16797] | 79 |
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[24393] | 80 | }
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[22973] | 81 |
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[24393] | 82 | public boolean databaseOK()
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| 83 | {
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| 84 | // Previously failed to open database
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| 85 | // Most likely cause is that this installation of Greenstone3 has not
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| 86 | // been compiled with support for this database type
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| 87 | return coll_db != null;
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| 88 | }
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[15325] | 89 |
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[24393] | 90 | /**
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| 91 | * open the database filename, with mode mode - uses the FlatDatabaseWrapper
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| 92 | * modes
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| 93 | */
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| 94 | public boolean openDatabase(String filename, int mode)
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| 95 | {
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| 96 | return this.coll_db.openDatabase(filename, mode);
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| 97 | }
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[15325] | 98 |
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[24393] | 99 | /** close the database */
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| 100 | public void closeDatabase()
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| 101 | {
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| 102 | this.coll_db.closeDatabase();
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| 103 | }
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[15325] | 104 |
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[24393] | 105 | /**
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| 106 | * Returns a DBInfo structure of the key-value pairs associated with a
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| 107 | * particular main key in the database
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| 108 | */
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| 109 | public DBInfo getInfo(String main_key)
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| 110 | {
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| 111 | // logger.warn("All the entries of the db are:");
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| 112 | // this.coll_db.displayAllEntries();
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[15325] | 113 |
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[24393] | 114 | if (this.coll_db == null)
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| 115 | {
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| 116 | // Most likely cause is that this installation of Greenstone3 has not
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| 117 | // been compiled with support for this database type
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| 118 | return null;
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| 119 | }
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[15325] | 120 |
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[24393] | 121 | String key_info = this.coll_db.getValue(main_key);
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| 122 | if (key_info == null || key_info.equals(""))
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| 123 | {
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| 124 | return null;
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| 125 | }
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| 126 |
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| 127 | DBInfo info = new DBInfo();
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[22319] | 128 |
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[24393] | 129 | String[] lines = StringUtils.split(key_info, "\n");
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| 130 | String key;
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| 131 | String value;
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| 132 | for (int i = 0; i < lines.length; i++)
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| 133 | {
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| 134 | logger.debug("line:" + lines[i]);
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| 135 | int a = lines[i].indexOf('<');
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| 136 | int b = lines[i].indexOf('>');
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| 137 | if (a == -1 || b == -1)
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| 138 | {
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| 139 | logger.error("bad format in db");
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| 140 | }
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| 141 | else
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| 142 | {
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| 143 | key = lines[i].substring(a + 1, b);
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| 144 | value = lines[i].substring(b + 1);
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| 145 | logger.debug("key=" + key + ", val=" + value);
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| 146 | info.addInfo(key, value);
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | return info;
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| 151 | }
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[15325] | 152 |
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[24393] | 153 | public boolean setInfo(String mainKey, DBInfo info)
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| 154 | {
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| 155 | StringBuilder valueToAdd = new StringBuilder();
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| 156 | Iterator i = info.getKeys().iterator();
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| 157 | while (i.hasNext())
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| 158 | {
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| 159 | String currentKey = (String)i.next();
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| 160 | Vector currentValues = (Vector)info.getMultiInfo(currentKey);
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| 161 |
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| 162 | if(currentValues.size() == 0)
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| 163 | {
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| 164 | valueToAdd.append("<" + currentKey + ">\n");
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| 165 | continue;
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| 166 | }
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| 167 |
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| 168 | for(int j = 0; j < currentValues.size(); j++)
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| 169 | {
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| 170 | valueToAdd.append("<" + currentKey + ">" + currentValues.get(j) + "\n");
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| 171 | }
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| 172 | }
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| 173 |
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| 174 | //Remove the final \n
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| 175 | if (valueToAdd.length() > 0)
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| 176 | {
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| 177 | valueToAdd.delete(valueToAdd.length() - 1, valueToAdd.length());
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| 178 | }
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| 179 |
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| 180 | return this.coll_db.setValue(mainKey, valueToAdd.toString());
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[15325] | 181 | }
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[24393] | 182 |
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| 183 | public String getValue(String key)
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| 184 | {
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| 185 | return this.coll_db.getValue(key);
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[15325] | 186 | }
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[24393] | 187 |
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| 188 | public boolean setValue(String key, String value)
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| 189 | {
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| 190 | return this.coll_db.setValue(key, value);
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[15325] | 191 | }
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| 192 |
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[24393] | 193 | public boolean deleteKey(String key)
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| 194 | {
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| 195 | return this.coll_db.deleteKey(key);
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| 196 | }
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| 197 |
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| 198 | /** converts a greenstone OID to internal docnum */
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| 199 | public String OID2Docnum(String OID)
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| 200 | {
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| 201 | DBInfo info = getInfo(OID);
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| 202 | if (info != null)
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| 203 | {
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| 204 | return info.getInfo("docnum");
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| 205 | }
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| 206 | return null;
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| 207 | }
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| 208 |
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| 209 | /**
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| 210 | * converts a greenstone OID to an internal docnum, returning a Long -
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| 211 | * convenience method
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| 212 | */
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| 213 | public long OID2DocnumLong(String OID)
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| 214 | {
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| 215 | DBInfo info = getInfo(OID);
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| 216 | if (info != null)
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| 217 | {
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| 218 | long real_num = Long.parseLong(info.getInfo("docnum"));
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| 219 | return real_num;
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| 220 | }
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| 221 | return -1;
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| 222 | }
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| 223 |
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| 224 | /** converts a docnum to greenstone OID */
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| 225 | public String docnum2OID(String docnum)
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| 226 | {
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| 227 | DBInfo info = getInfo(docnum);
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| 228 | if (info != null)
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| 229 | {
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| 230 | String oid = info.getInfo("section");
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| 231 | return oid;
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| 232 | }
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| 233 | else
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| 234 | {
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| 235 | return null;
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| 236 | }
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| 237 | }
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| 238 |
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| 239 | /**
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| 240 | * converts a docnum to greenstone OID - convenience method
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| 241 | */
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| 242 | public String docnum2OID(long docnum)
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| 243 | {
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| 244 | return docnum2OID(Long.toString(docnum));
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| 245 | }
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| 246 |
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| 247 | /** converts an external id to greenstone OID */
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| 248 | public String externalId2OID(String extid)
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| 249 | {
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| 250 | DBInfo info = getInfo(extid);
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| 251 | if (info != null)
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| 252 | {
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| 253 | String oid = info.getInfo("section");
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| 254 | return oid;
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| 255 | }
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| 256 | return null;
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| 257 | }
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| 258 |
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| 259 | /**
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| 260 | * After OID.translateOID() is through, this method processes OID further to
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| 261 | * translate relative oids into proper oids: .pr (parent), .rt (root) .fc
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| 262 | * (first child), .lc (last child), .ns (next sibling), .ps (previous
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| 263 | * sibling) .np (next page), .pp (previous page) : links sections in the
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| 264 | * order that you'd read the document a suffix is expected to be present so
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| 265 | * test before using
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| 266 | */
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| 267 | public String processOID(String doc_id, String top, String suff, int sibling_num)
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| 268 | {
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| 269 | DBInfo info = getInfo(doc_id);
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| 270 | if (info == null)
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| 271 | {
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| 272 | logger.info("info is null!!");
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| 273 | return top;
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| 274 | }
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| 275 |
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| 276 | String contains = info.getInfo("contains");
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| 277 | if (contains.equals(""))
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| 278 | {
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| 279 | // something is wrong
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| 280 | return top;
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| 281 | }
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| 282 | contains = StringUtils.replace(contains, "\"", doc_id);
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| 283 | String[] children = StringUtils.split(contains, ";");
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| 284 | if (suff.equals("fc"))
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| 285 | {
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| 286 | return children[0];
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| 287 | }
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| 288 | else if (suff.equals("lc"))
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| 289 | {
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| 290 | return children[children.length - 1];
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| 291 | }
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| 292 | else
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| 293 | {
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| 294 | if (suff.equals("ss"))
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| 295 | {
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| 296 | return children[sibling_num - 1];
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| 297 | }
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| 298 | // find the position that we are at.
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| 299 | int i = 0;
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| 300 | while (i < children.length)
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| 301 | {
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| 302 | if (children[i].equals(top))
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| 303 | {
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| 304 | break;
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| 305 | }
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| 306 | i++;
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| 307 | }
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| 308 |
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| 309 | if (suff.equals("ns"))
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| 310 | {
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| 311 | if (i == children.length - 1)
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| 312 | {
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| 313 | return children[i];
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| 314 | }
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| 315 | return children[i + 1];
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| 316 | }
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| 317 | else if (suff.equals("ps"))
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| 318 | {
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| 319 | if (i == 0)
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| 320 | {
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| 321 | return children[i];
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| 322 | }
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| 323 | return children[i - 1];
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| 324 | }
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| 325 | }
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| 326 |
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| 327 | return top;
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| 328 | }
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[15325] | 329 | }
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