1 | package org.greenstone.gsdl3.gs3build.doctypes;
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2 |
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3 | import java.util.Iterator;
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4 | import java.util.List;
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5 | import java.util.ArrayList;
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6 |
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7 | import java.io.PrintWriter;
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8 | import java.io.FileWriter;
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9 | import java.io.File;
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10 | import java.io.IOException;
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11 |
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12 | import java.net.URL;
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13 |
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14 | import java.sql.SQLException;
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15 | import java.sql.ResultSet;
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16 |
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17 | import org.greenstone.gsdl3.gs3build.metadata.METSFileGroup;
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18 |
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19 | import org.greenstone.gsdl3.gs3build.util.GS3SQLConnection;
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20 | import org.greenstone.gsdl3.gs3build.database.GS3SQLSelect;
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21 | import org.greenstone.gsdl3.gs3build.database.GS3SQLWhereItem;
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22 | import org.greenstone.gsdl3.gs3build.database.GS3SQLWhere;
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23 | import org.greenstone.gsdl3.gs3build.database.GS3SQLField;
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24 |
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25 | public class DocumentList
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26 | {
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27 | DocumentInterface [] list; // what is currently cached
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28 | int size; // the maximum number in the cache
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29 | int used; // the actual number in the cache
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30 | int count; // the total number of known documents
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31 | DocumentIDFactoryInterface idFactory; // A manufacturer of novel document IDs
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32 | GS3SQLConnection connection; // used to query the SQL database
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33 |
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34 | private static final int maxSize = 3;
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35 |
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36 | public DocumentList(GS3SQLConnection connection)
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37 | { this.idFactory = null;
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38 | this.list = new DocumentInterface[3];
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39 | this.used = 0;
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40 | this.size = 3;
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41 | this.count = 0;
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42 | this.connection = connection;
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43 | }
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44 |
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45 | public DocumentList(DocumentIDFactoryInterface idFactory, GS3SQLConnection connection)
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46 | { this.idFactory = idFactory;
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47 | this.list = new DocumentInterface[3];
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48 | this.used = 0;
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49 | this.size = 3;
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50 | this.count = 0;
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51 | this.connection = connection;
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52 | }
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53 |
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54 |
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55 | public List getDocumentIdsWithFile(URL fileLocation)
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56 | { List reply = new ArrayList();
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57 |
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58 | GS3SQLSelect select = new GS3SQLSelect("files");
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59 | select.addField("*");
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60 | GS3SQLWhere where = new GS3SQLWhere(new GS3SQLWhereItem("FileLocation", "=", fileLocation.toString()));
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61 | select.setWhere(where);
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62 |
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63 | this.connection.execute(select.toString());
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64 |
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65 | ResultSet results = this.connection.getResultSet();
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66 | if (results != null) {
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67 | select = new GS3SQLSelect("filegroups");
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68 | select.addField("DocID");
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69 | select.setDistinct(true);
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70 |
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71 | where = new GS3SQLWhere();
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72 | where.setCondition(GS3SQLWhere.OR_CONDITION);
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73 |
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74 | GS3SQLWhereItem whereItem = null;
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75 |
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76 | try {
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77 | results.first();
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78 | do {
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79 | int fileGroupRef = results.getInt("FileGroupRef");
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80 | whereItem = new GS3SQLWhereItem("FileGroupRef", "=", Integer.toString(fileGroupRef), GS3SQLField.INTEGER_TYPE);
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81 | where.add(whereItem);
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82 | }
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83 | while (results.next());
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84 | select.setWhere(where);
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85 | results.close();
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86 |
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87 | this.connection.execute(select.toString());
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88 |
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89 | results = this.connection.getResultSet();
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90 | results.first();
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91 | do {
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92 | String docId = results.getString("DocID");
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93 | reply.add(docId);
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94 | } while (results.next());
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95 | }
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96 | catch (SQLException sqlEx)
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97 | { System.err.println(sqlEx);
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98 | }
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99 | }
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100 | return reply;
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101 | }
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102 |
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103 | /**
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104 | * Get a list of documents that match a
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105 | */
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106 | public List findDocumentIdsUsingFiles(List fileRefs, String withinNode)
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107 | {
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108 | StringBuffer queryBuffer = new StringBuffer("SELECT FileGroupRef FROM files WHERE FileLocation ");
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109 |
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110 | Iterator files = fileRefs.iterator();
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111 | while (files.hasNext()) {
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112 | String file = files.next().toString();
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113 |
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114 | if (withinNode != null) {
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115 | queryBuffer.append("REGEXP \"^");
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116 | queryBuffer.append(withinNode);
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117 | queryBuffer.append(".*");
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118 | }
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119 | else {
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120 | queryBuffer.append("REGEXP \"");
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121 | }
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122 | queryBuffer.append(file);
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123 | queryBuffer.append("\"");
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124 |
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125 | if (files.hasNext()) {
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126 | queryBuffer.append(" OR ");
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127 | }
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128 | }
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129 | queryBuffer.append(";");
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130 | return this.findDocumentIdsUsingFileQuery(queryBuffer.toString());
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131 | }
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132 |
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133 | public List findDocumentIdsUsingFile(String fileRef, String withinNode)
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134 | { String query = "SELECT FileGroupRef FROM files WHERE FileLocation REGEXP \"^"+withinNode+".*"+fileRef+"\";";
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135 | return this.findDocumentIdsUsingFileQuery(query);
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136 | }
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137 |
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138 | public List findDocumentIdsUsingFile(String fileRef)
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139 | {
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140 | // Get the simple list of file objects & their file group reference
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141 | String query = "SELECT FileGroupRef FROM files WHERE FileLocation REGEXP \"" + fileRef +"\";";
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142 |
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143 | return this.findDocumentIdsUsingFileQuery(query);
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144 | }
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145 |
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146 | private List findDocumentIdsUsingFileQuery(String query)
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147 | { this.connection.execute(query);
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148 |
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149 | try {
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150 |
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151 | ResultSet results = this.connection.getResultSet();
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152 | if (results == null ||
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153 | !results.first()) {
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154 | return null;
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155 | }
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156 |
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157 | // get a list of group ids first and turn it into a query on filegroups
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158 | StringBuffer queryBuffer = new StringBuffer("SELECT * FROM filegroups WHERE ");
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159 | boolean first = true;
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160 |
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161 | do {
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162 | int groupRef = results.getInt("FileGroupRef");
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163 |
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164 | if (first) {
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165 | first = false;
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166 | }
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167 | else {
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168 | queryBuffer.append(" OR ");
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169 | }
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170 | queryBuffer.append("FileGroupRef=" + Integer.toString(groupRef));
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171 | } while (results.next());
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172 | queryBuffer.append(";");
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173 |
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174 | // make a holder for the actual file section identifiers
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175 | List divisions = new ArrayList();
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176 |
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177 | // expand (or, in fact, contract) through the document
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178 | // structures...recreating new filegroup queries as necessary
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179 | while (queryBuffer.length() > 0) {
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180 | connection.execute(queryBuffer.toString());
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181 |
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182 | results = this.connection.getResultSet();
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183 | if (results == null || !results.first()) {
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184 | return null;
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185 | }
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186 |
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187 | queryBuffer = new StringBuffer();
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188 | do {
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189 | String type = results.getString("ParentType");
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190 | String parentRef = results.getString("ParentRef");
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191 | if (type.equals(METSFileGroup.SECTION_PARENT)) {
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192 | divisions.add(parentRef);
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193 | }
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194 | else {
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195 | if (queryBuffer.length() > 0) {
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196 | queryBuffer.append(" OR ");
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197 | }
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198 | queryBuffer.append("FileGroupRef=" + parentRef);
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199 | }
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200 | } while (results.next());
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201 |
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202 | if (queryBuffer.length() > 0) {
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203 | queryBuffer.insert(0, "SELECT * FROM filegroups WHERE ");
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204 | queryBuffer.append(";");
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205 | }
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206 | }
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207 |
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208 | // ok, now find all the sections in which we are interested...
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209 | queryBuffer.setLength(0);
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210 | queryBuffer.append("SELECT DISTINCT DocID FROM filesection WHERE ");
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211 | Iterator iterator = divisions.iterator();
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212 | first = true;
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213 |
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214 | while (iterator.hasNext()) {
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215 | String ref = iterator.next().toString();
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216 |
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217 | if (first) {
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218 | first = false;
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219 | }
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220 | else {
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221 | queryBuffer.append(" OR ");
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222 | }
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223 |
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224 | queryBuffer.append("FileSectionRef="+ref);
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225 | }
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226 | queryBuffer.append(";");
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227 |
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228 | // execute the division query
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229 | this.connection.execute(queryBuffer.toString());
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230 |
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231 | results = this.connection.getResultSet();
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232 | if (results == null ||
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233 | !results.first()) {
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234 | return null;
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235 | }
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236 |
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237 | List reply = new ArrayList();
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238 | do {
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239 | reply.add(results.getString("DocID"));
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240 | } while (results.next());
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241 |
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242 | return reply;
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243 | }
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244 | catch (SQLException ex) {
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245 | System.err.println(ex);
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246 | }
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247 | return null;
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248 | }
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249 |
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250 | /**
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251 | * Cache a document into the cache, without writing it to the database.
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252 | * Used directly by other parts of DocumentList when they know that the
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253 | * document is in the database already, or they are going to write it
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254 | * themselves...
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255 | *
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256 | * @param <code>DocumentInterface</code> the document to cache
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257 | */
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258 | private void cacheDocument(DocumentInterface document)
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259 | { // increase cache size, etc. as necessary
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260 | if (this.used == this.size) {
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261 | if (this.size >= maxSize) {
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262 | for (int i = 0; i < this.size - 1; i ++) {
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263 | this.list[i] = this.list[i+1];
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264 | }
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265 | this.used --;
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266 | }
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267 | else {
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268 | this.ensureSize((this.size * 2) > maxSize ? maxSize : (this.size * 2));
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269 | }
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270 | }
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271 |
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272 | // insert the document itself
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273 | this.list[this.used] = document;
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274 | }
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275 |
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276 | /**
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277 | * Write the document into the document list (cache) and the database.
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278 | *
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279 | * @param <code>DocumentInterface</code> the document itself
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280 | */
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281 | public void addDocument(DocumentInterface document)
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282 | { // initially, test if the document has a duplicate...
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283 | if (document.hasDuplicate(this.connection)) {
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284 | System.out.println("Found duplicate document ");
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285 | return;
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286 | }
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287 |
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288 | // first cache it...
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289 | this.cacheDocument(document);
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290 |
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291 | // set the document identifier, if not already set
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292 | if (document.getID() == null) {
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293 | DocumentID id = this.idFactory.getNewDocumentID(document);
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294 | document.setID(id);
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295 | }
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296 |
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297 | // add to the database as well, if it is modified...
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298 | if (document.isModified()) {
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299 | document.getSQLWriter().writeDocument(document, this.connection);
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300 | }
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301 |
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302 | // Remember that we've used one more item from the cache.
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303 | this.used ++;
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304 |
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305 | // Note additional document
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306 | this.count ++;
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307 | }
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308 |
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309 | /**
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310 | * Note that an individual document is modified, and act accordingly
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311 | *
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312 | * @param <code>DocumentInterface</code> the document
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313 | */
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314 | public void modifiedDocument(DocumentInterface document)
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315 | { document.getSQLWriter().writeDocument(document, this.connection);
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316 | }
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317 |
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318 | /**
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319 | * Get an iterator across all the documents, not merely those in
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320 | * the cache. Note that this <code>Iterator</code> does <b>not</b>
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321 | * support the <code>remove()</code> function, and will raise an
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322 | * <code>UnsupportedOperationException</code> if you attempt to do
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323 | * so.
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324 | *
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325 | * @return <code>Iterator</code> the iterator across the documents.
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326 | */
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327 | public Iterator iterator()
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328 | { return new DocumentListIterator(connection);
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329 | }
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330 |
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331 | /**
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332 | * Get the nth member of the <b>cached</b> document list.
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333 | *
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334 | * @deprecated
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335 | */
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336 | public DocumentInterface getDocument(int index)
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337 | { if (index < 0 || index >= this.used)
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338 | { return null;
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339 | }
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340 | return this.list[index];
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341 | }
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342 |
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343 | public DocumentInterface getDocument(DocumentID documentId)
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344 | {
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345 | DocumentInterface document = DocumentFactory.readSQLDocument(connection, documentId);
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346 | if (document != null) {
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347 | this.cacheDocument(document);
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348 | }
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349 | return document;
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350 | }
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351 |
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352 | /**
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353 | public DocumentID getDocumentID(int index)
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354 | { if (index < 0 || index >= this.used)
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355 | { return null;
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356 | }
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357 | return this.list[index].getID();
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358 | }
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359 | */
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360 |
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361 | protected void ensureSize(int size)
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362 | { DocumentInterface [] newList = new DocumentInterface[size];
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363 | System.arraycopy(this.list, 0, newList, 0, this.size);
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364 | this.list = newList;
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365 | this.size = size;
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366 | }
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367 |
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368 | public void writeDocuments(File directory)
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369 | { Iterator documents = this.iterator();
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370 | int item = 0;
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371 |
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372 | while (documents.hasNext())
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373 | { DocumentInterface document = (DocumentInterface) documents.next();
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374 | try
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375 | { item ++;
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376 | File localFile = new File(directory, "Doc"+Integer.toString(item)+".xml");
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377 | FileWriter fileWriter = new FileWriter(localFile);
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378 | PrintWriter writer = new PrintWriter(fileWriter);
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379 | document.getMETSWriter().writeDocument(document, writer);
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380 | writer.close();
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381 | fileWriter.close();
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382 | }
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383 | catch (IOException io)
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384 | {
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385 | }
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386 | }
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387 | }
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388 |
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389 | public void writeSQLDocuments(GS3SQLConnection connection)
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390 | { for (int i = 0; i < this.used; i ++)
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391 | { this.list[i].getSQLWriter().writeDocument(this.list[i], connection);
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392 | }
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393 | }
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394 |
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395 | public static DocumentList readSQLDocuments(GS3SQLConnection connection)
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396 | { DocumentList list = new DocumentList(connection);
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397 |
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398 | GS3SQLSelect select = new GS3SQLSelect("document");
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399 | select.addField("*");
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400 |
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401 | ResultSet documents;
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402 | try {
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403 | connection.execute(select.toString());
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404 | documents = connection.getResultSet();
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405 |
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406 | if (documents.first())
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407 | { do
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408 | { DocumentInterface document = AbstractDocument.readSQL(connection, documents);
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409 | list.addDocument(document);
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410 | }
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411 | while (documents.next());
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412 | }
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413 | }
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414 | catch (java.sql.SQLException ex)
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415 | { System.out.println(ex);
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416 | return null;
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417 | }
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418 |
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419 | return list;
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420 | }
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421 |
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422 | public int getCount()
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423 | { return this.count;
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424 | }
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425 |
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426 | public int size()
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427 | { return this.used;
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428 | }
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429 | }
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430 |
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431 | class DocumentListIterator implements Iterator
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432 | {
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433 | private boolean hasNext;
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434 | private ResultSet resultSet;
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435 | private GS3SQLConnection connection;
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436 |
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437 | public DocumentListIterator(GS3SQLConnection connection)
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438 | {
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439 | this.connection = connection;
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440 |
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441 | GS3SQLSelect select = new GS3SQLSelect("document");
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442 | select.addField("*");
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443 |
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444 | try {
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445 | connection.execute(select.toString());
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446 | this.resultSet = connection.getResultSet();
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447 | this.hasNext = this.resultSet.first();
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448 | } catch (SQLException ex) {
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449 | this.hasNext = false;
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450 | }
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451 | }
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452 |
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453 | public boolean hasNext()
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454 | { return this.hasNext;
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455 | }
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456 |
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457 | public Object next()
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458 | {
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459 | // get the 'next' document first
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460 | DocumentInterface document = AbstractDocument.readSQL(connection, this.resultSet);
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461 |
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462 | // now actually step forward to the next item, so that we know if we have one!
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463 | try {
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464 | this.hasNext = this.resultSet.next();
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465 |
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466 | if (!this.hasNext) {
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467 | this.resultSet.close(); // be a good citizen & close used result sets
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468 | }
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469 | } catch (SQLException ex) {
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470 | this.hasNext = false;
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471 | }
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472 | return document;
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473 | }
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474 |
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475 | public void remove() throws UnsupportedOperationException
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476 | { throw new UnsupportedOperationException("DocumentList does not support iterator removal of documents");
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477 | }
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478 | }
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