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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21 | import org.apache.log4j.*;
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22 |
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23 | public class SimpleCollectionDatabase {
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24 |
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25 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.util.SimpleCollectionDatabase.class.getName());
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26 |
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27 | /* just read access, many readers can share a database */
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28 | public final static int READ = FlatDatabaseWrapper.READ;
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29 | /* read/write, exclusive access */
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30 | public final static int WRITE = FlatDatabaseWrapper.WRITE;
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31 |
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32 | protected FlatDatabaseWrapper coll_db = null;
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33 |
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34 | public SimpleCollectionDatabase(String db_type) {
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35 | if (db_type.equalsIgnoreCase("gdbm")) {
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36 | this.coll_db = new GDBMWrapper();
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37 | }
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38 | else if (db_type.equalsIgnoreCase("jdbm")) {
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39 | this.coll_db = new JDBMWrapper();
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40 | }
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41 | else {
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42 | logger.error("Couldn't create SimpleCollectionDatabase of type "+db_type);
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43 | }
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44 | }
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45 |
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46 | /** open the database filename, with mode mode - uses the FlatDatabaseWrapper modes */
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47 | public boolean openDatabase(String filename, int mode){
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48 | return this.coll_db.openDatabase(filename, mode);
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49 | }
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50 |
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51 | /** close the database */
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52 | public void closeDatabase() {
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53 | this.coll_db.closeDatabase();
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54 | }
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55 |
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56 | /** Returns a DBInfo structure of the key-value pairs associated with a
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57 | particular main key in the database */
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58 | public DBInfo getInfo(String main_key) {
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59 | String key_info = this.coll_db.getValue(main_key);
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60 | if (key_info == null || key_info.equals("")) {
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61 | return null;
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62 | }
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63 |
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64 | DBInfo info = new DBInfo();
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65 |
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66 | String [] lines = key_info.split("\n");
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67 | String key;
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68 | String value;
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69 | for (int i=0; i<lines.length; i++) {
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70 | logger.debug("line:"+lines[i]);
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71 | int a = lines[i].indexOf('<');
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72 | int b= lines[i].indexOf('>');
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73 | if (a==-1 || b==-1) {
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74 | logger.error("bad format in db");
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75 | }
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76 | else {
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77 | key=lines[i].substring(a+1, b);
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78 | value=lines[i].substring(b+1);
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79 | logger.debug("key="+key+", val="+value);
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80 | info.addInfo(key, value);
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81 |
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82 | }
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83 | }
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84 | return info;
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85 |
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86 | }
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87 |
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88 | /** converts a greenstone OID to internal docnum */
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89 | public String OID2Docnum(String OID) {
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90 | DBInfo info = getInfo(OID);
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91 | if (info != null) {
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92 | return info.getInfo("docnum");
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93 | }
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94 | return null;
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95 | }
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96 |
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97 | /** converts a greenstone OID to an internal docnum, returning a Long
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98 | - convenience method*/
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99 | public long OID2DocnumLong(String OID) {
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100 | DBInfo info = getInfo(OID);
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101 | if (info != null) {
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102 | long real_num = Long.parseLong(info.getInfo("docnum"));
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103 | return real_num;
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104 | }
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105 | return -1;
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106 | }
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107 |
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108 |
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109 | /** converts a docnum to greenstone OID */
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110 | public String docnum2OID(String docnum) {
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111 | DBInfo info = getInfo(docnum);
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112 | if (info!=null){
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113 | String oid = info.getInfo("section");
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114 | return oid;
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115 | } else{
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116 | return null;
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117 | }
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118 | }
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119 |
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120 | /** converts a docnum to greenstone OID
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121 | - convenience method */
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122 | public String docnum2OID(long docnum) {
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123 | return docnum2OID(Long.toString(docnum));
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124 | }
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125 |
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126 | /** converts an external id to greenstone OID */
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127 | public String externalId2OID(String extid) {
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128 | DBInfo info = getInfo(extid);
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129 | if (info != null) {
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130 | String oid = info.getInfo("section");
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131 | return oid;
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132 | }
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133 | return null;
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134 | }
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135 |
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136 | /** translates relative oids into proper oids:
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137 | * .pr (parent), .rt (root) .fc (first child), .lc (last child),
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138 | * .ns (next sibling), .ps (previous sibling)
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139 | * .np (next page), .pp (previous page) : links sections in the order that you'd read the document
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140 | * a suffix is expected to be present so test before using
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141 | */
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142 | public String translateOID(String oid) {
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143 |
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144 | int p = oid.lastIndexOf('.');
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145 | if (p != oid.length()-3) {
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146 | logger.info("translateoid error: '.' is not the third to last char!!");
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147 | return oid;
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148 | }
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149 |
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150 | String top = oid.substring(0, p);
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151 | String suff = oid.substring(p+1);
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152 | // just in case we have multiple extensions, we must translate
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153 | // we process inner ones first
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154 | if (OID.needsTranslating(top)) {
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155 | top = translateOID(top);
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156 | }
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157 | if (suff.equals("pr")) {
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158 | return OID.getParent(top);
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159 | }
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160 | if (suff.equals("rt")) {
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161 | return OID.getTop(top);
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162 | }
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163 | if (suff.equals("np")) {
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164 | // try first child
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165 | String node_id = translateOID(top+".fc");
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166 | if (!node_id.equals(top)) {
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167 | return node_id;
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168 | }
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169 | // try next sibling
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170 | node_id = translateOID(top+".ns");
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171 | if (!node_id.equals(top)) {
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172 | return node_id;
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173 | }
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174 | // otherwise we keep trying parents sibling
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175 | String child_id = top;
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176 | String parent_id = OID.getParent(child_id);
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177 | while(!parent_id.equals(child_id)) {
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178 | node_id = translateOID(parent_id+".ns");
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179 | if (!node_id.equals(parent_id)) {
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180 | return node_id;
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181 | }
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182 | child_id = parent_id;
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183 | parent_id = OID.getParent(child_id);
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184 | }
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185 | return top; // we couldn't get a next page, so just return the original
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186 | }
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187 | if (suff.equals("pp")) {
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188 | String prev_sib = translateOID(top+".ps");
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189 | if (prev_sib.equals(top)) {
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190 | // no previous sibling, so return the parent
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191 | return OID.getParent(top);
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192 | }
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193 | // there is a previous sibling, so its either this section, or the last child of the last child..
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194 | String last_child = translateOID(prev_sib+".lc");
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195 | while (!last_child.equals(prev_sib)) {
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196 | prev_sib = last_child;
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197 | last_child = translateOID(prev_sib+".lc");
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198 | }
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199 | return last_child;
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200 | }
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201 |
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202 | int sibling_num = 0;
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203 | if (suff.equals("ss")) {
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204 | // we have to remove the sib num before we get top
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205 | p = top.lastIndexOf('.');
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206 | sibling_num = Integer.parseInt(top.substring(p+1));
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207 | top = top.substring(0, p);
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208 | }
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209 |
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210 | // need to get info out of collection db -
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211 | String doc_id = top;
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212 | if (suff.endsWith("s")) {
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213 | doc_id = OID.getParent(top);
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214 | if (doc_id.equals(top)) {
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215 | // i.e. we are already at the top
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216 | return top;
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217 | }
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218 | }
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219 | DBInfo info = getInfo(doc_id);
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220 | if (info==null) {
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221 | logger.info("info is null!!");
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222 | return top;
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223 | }
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224 |
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225 | String contains = info.getInfo("contains");
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226 | if (contains.equals("")) {
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227 | // something is wrong
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228 | return top;
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229 | }
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230 | contains = contains.replaceAll("\"", doc_id);
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231 | String [] children = contains.split(";");
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232 | if (suff.equals("fc")) {
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233 | return children[0];
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234 | } else if (suff.equals("lc")) {
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235 | return children[children.length-1];
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236 | } else {
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237 | if (suff.equals("ss")) {
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238 | return children[sibling_num-1];
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239 | }
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240 | // find the position that we are at.
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241 | int i=0;
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242 | while (i<children.length) {
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243 | if (children[i].equals(top)) {
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244 | break;
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245 | }
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246 | i++;
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247 | }
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248 |
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249 | if (suff.equals("ns")) {
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250 | if (i==children.length-1) {
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251 | return children[i];
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252 | }
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253 | return children[i+1];
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254 | } else if (suff.equals("ps")) {
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255 | if (i==0) {
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256 | return children[i];
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257 | }
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258 | return children[i-1];
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259 | }
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260 | }
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261 |
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262 | return top;
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263 | }
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264 | }
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