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155
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/**
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203
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* '$RCSfile$'
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* Purpose: A Class that searches a relational DB for elements and
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4 |
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* attributes that have free text matches a query string,
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* or structured query matches to a path specified node in the
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* XML hierarchy. It returns a result set consisting of the
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* document ID for each document that satisfies the query
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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349
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jones
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* Release: @release@
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155
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jones
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*
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203
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jones
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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155
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jones
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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401
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berkley
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import java.util.Vector;
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155
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jones
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.sql.*;
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import java.util.Stack;
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import java.util.Hashtable;
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import java.util.Enumeration;
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/**
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172
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jones
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* A Class that searches a relational DB for elements and
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* attributes that have free text matches a query string,
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* or structured query matches to a path specified node in the
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* XML hierarchy. It returns a result set consisting of the
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* document ID for each document that satisfies the query
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155
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jones
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*/
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public class DBQuery {
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private Connection conn = null;
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private String parserName = null;
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155
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jones
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/**
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* the main routine used to test the DBQuery utility.
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184
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jones
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* <p>
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* Usage: java DBQuery <xmlfile>
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155
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jones
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*
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* @param xmlfile the filename of the xml file containing the query
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155
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jones
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*/
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static public void main(String[] args) {
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184
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jones
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if (args.length < 1)
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155
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jones
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{
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System.err.println("Wrong number of arguments!!!");
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184
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System.err.println("USAGE: java DBQuery <xmlfile>");
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155
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jones
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return;
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} else {
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try {
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170
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jones
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String xmlfile = args[0];
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155
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jones
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// Open a connection to the database
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184
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MetaCatUtil util = new MetaCatUtil();
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Connection dbconn = util.openDBConnection();
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172
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jones
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170
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// Execute the query
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184
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DBQuery queryobj = new DBQuery(dbconn, util.getOption("saxparser"));
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170
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FileReader xml = new FileReader(new File(xmlfile));
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155
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Hashtable nodelist = null;
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181
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nodelist = queryobj.findDocuments(xml);
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155
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jones
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172
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// Print the reulting document listing
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155
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jones
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StringBuffer result = new StringBuffer();
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String document = null;
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170
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String docid = null;
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155
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jones
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result.append("<?xml version=\"1.0\"?>\n");
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296
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higgins
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result.append("<resultset>\n");
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// following line removed by Dan Higgins to avoid insertion of query XML inside returned XML doc
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// result.append(" <query>" + xmlfile + "</query>\n");
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155
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jones
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Enumeration doclist = nodelist.keys();
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while (doclist.hasMoreElements()) {
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170
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docid = (String)doclist.nextElement();
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155
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jones
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document = (String)nodelist.get(docid);
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result.append(" <document>\n " + document +
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"\n </document>\n");
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}
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result.append("</resultset>\n");
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System.out.println(result);
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89 |
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} catch (Exception e) {
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System.err.println("EXCEPTION HANDLING REQUIRED");
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System.err.println(e.getMessage());
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e.printStackTrace(System.err);
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93 |
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}
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}
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}
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/**
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* construct an instance of the DBQuery class
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*
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* <p>Generally, one would call the findDocuments() routine after creating
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* an instance to specify the search query</p>
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*
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* @param conn the JDBC connection that we use for the query
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172
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* @param parserName the fully qualified name of a Java class implementing
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185
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jones
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* the org.xml.sax.XMLReader interface
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106 |
155
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jones
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*/
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172
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jones
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public DBQuery( Connection conn, String parserName )
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155
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jones
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throws IOException,
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SQLException,
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172
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jones
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ClassNotFoundException {
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155
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jones
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this.conn = conn;
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172
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jones
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this.parserName = parserName;
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155
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jones
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}
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114 |
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115 |
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/**
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* routine to search the elements and attributes looking to match query
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*
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178
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jones
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* @param xmlquery the xml serialization of the query (@see pathquery.dtd)
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155
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jones
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*/
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120 |
178
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jones
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public Hashtable findDocuments(Reader xmlquery) {
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155
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jones
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Hashtable docListResult = new Hashtable();
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122 |
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PreparedStatement pstmt;
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170
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jones
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String docid = null;
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155
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jones
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String docname = null;
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125 |
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String doctype = null;
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String doctitle = null;
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401
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berkley
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String createDate = null;
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128 |
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String updateDate = null;
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129 |
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String fieldname = null;
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String fielddata = null;
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155
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jones
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StringBuffer document = null;
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133 |
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try {
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172
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jones
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// Get the XML query and covert it into a SQL statment
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135 |
178
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jones
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QuerySpecification qspec = new QuerySpecification(xmlquery,
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136 |
172
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jones
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parserName);
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137 |
180
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jones
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//System.out.println(qspec.printSQL());
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172
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jones
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pstmt = conn.prepareStatement( qspec.printSQL() );
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155
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jones
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140 |
172
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jones
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// Execute the SQL query using the JDBC connection
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155
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jones
|
pstmt.execute();
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142 |
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ResultSet rs = pstmt.getResultSet();
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143 |
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boolean tableHasRows = rs.next();
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144 |
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while (tableHasRows) {
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145 |
170
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jones
|
docid = rs.getString(1);
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155
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jones
|
docname = rs.getString(2);
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147 |
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doctype = rs.getString(3);
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148 |
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doctitle = rs.getString(4);
|
149 |
401
|
berkley
|
createDate = rs.getString(5);
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150 |
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updateDate = rs.getString(6);
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151 |
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152 |
155
|
jones
|
document = new StringBuffer();
|
153 |
401
|
berkley
|
|
154 |
155
|
jones
|
document.append("<docid>").append(docid).append("</docid>");
|
155 |
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if (docname != null) {
|
156 |
|
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document.append("<docname>" + docname + "</docname>");
|
157 |
|
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}
|
158 |
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|
if (doctype != null) {
|
159 |
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document.append("<doctype>" + doctype + "</doctype>");
|
160 |
|
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}
|
161 |
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if (doctitle != null) {
|
162 |
|
|
document.append("<doctitle>" + doctitle + "</doctitle>");
|
163 |
|
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}
|
164 |
401
|
berkley
|
if(createDate != null) {
|
165 |
|
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document.append("<createdate>" + createDate + "</createdate>");
|
166 |
|
|
}
|
167 |
|
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if(updateDate != null) {
|
168 |
|
|
document.append("<updatedate>" + updateDate + "</updatedate>");
|
169 |
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}
|
170 |
155
|
jones
|
|
171 |
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// Store the document id and the root node id
|
172 |
170
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jones
|
docListResult.put(docid,(String)document.toString());
|
173 |
155
|
jones
|
|
174 |
|
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// Advance to the next record in the cursor
|
175 |
|
|
tableHasRows = rs.next();
|
176 |
|
|
}
|
177 |
401
|
berkley
|
|
178 |
|
|
if(qspec.containsExtendedSQL())
|
179 |
|
|
{
|
180 |
|
|
Vector extendedFields = new Vector(qspec.getReturnFieldList());
|
181 |
|
|
Vector results = new Vector();
|
182 |
|
|
pstmt = conn.prepareStatement(qspec.printExtendedSQL());
|
183 |
|
|
pstmt.execute();
|
184 |
|
|
rs = pstmt.getResultSet();
|
185 |
|
|
tableHasRows = rs.next();
|
186 |
|
|
while(tableHasRows)
|
187 |
|
|
{
|
188 |
|
|
docid = rs.getString(1);
|
189 |
|
|
fieldname = rs.getString(2);
|
190 |
|
|
fielddata = rs.getString(3);
|
191 |
|
|
|
192 |
|
|
document = new StringBuffer();
|
193 |
|
|
|
194 |
423
|
berkley
|
document.append("<param name=\"");
|
195 |
405
|
berkley
|
document.append(fieldname);
|
196 |
423
|
berkley
|
document.append("\">");
|
197 |
401
|
berkley
|
document.append(fielddata);
|
198 |
423
|
berkley
|
document.append("</param>");
|
199 |
401
|
berkley
|
|
200 |
|
|
tableHasRows = rs.next();
|
201 |
|
|
if(docListResult.containsKey(docid))
|
202 |
|
|
{
|
203 |
|
|
String removedelement = (String)docListResult.remove(docid);
|
204 |
|
|
docListResult.put(docid, removedelement + document.toString());
|
205 |
|
|
}
|
206 |
|
|
else
|
207 |
|
|
{
|
208 |
|
|
docListResult.put(docid, document.toString());
|
209 |
|
|
}
|
210 |
|
|
}
|
211 |
|
|
}
|
212 |
155
|
jones
|
pstmt.close();
|
213 |
|
|
} catch (SQLException e) {
|
214 |
180
|
jones
|
System.err.println("Error getting id: " + e.getMessage());
|
215 |
170
|
jones
|
} catch (IOException ioe) {
|
216 |
|
|
System.err.println("Error printing qspec:");
|
217 |
|
|
System.err.println(ioe.getMessage());
|
218 |
155
|
jones
|
}
|
219 |
423
|
berkley
|
//System.out.println("docListResult: ");
|
220 |
|
|
//System.out.println(docListResult.toString());
|
221 |
155
|
jones
|
return docListResult;
|
222 |
|
|
}
|
223 |
342
|
berkley
|
|
224 |
|
|
/**
|
225 |
|
|
* format a structured query as an XML document that conforms
|
226 |
|
|
* to the pathquery.dtd and is appropriate for submission to the DBQuery
|
227 |
|
|
* structured query engine
|
228 |
|
|
*
|
229 |
|
|
* @param params The list of parameters that should be included in the query
|
230 |
|
|
*/
|
231 |
372
|
berkley
|
public static String createSQuery(Hashtable params)
|
232 |
350
|
berkley
|
{
|
233 |
|
|
StringBuffer query = new StringBuffer();
|
234 |
342
|
berkley
|
Enumeration elements;
|
235 |
|
|
Enumeration keys;
|
236 |
372
|
berkley
|
String doctype = null;
|
237 |
|
|
String casesensitive = null;
|
238 |
|
|
String searchmode = null;
|
239 |
342
|
berkley
|
Object nextkey;
|
240 |
|
|
Object nextelement;
|
241 |
350
|
berkley
|
//add the xml headers
|
242 |
|
|
query.append("<?xml version=\"1.0\"?>\n");
|
243 |
342
|
berkley
|
query.append("<pathquery version=\"1.0\"><meta_file_id>");
|
244 |
350
|
berkley
|
|
245 |
342
|
berkley
|
if(params.containsKey("meta_file_id"))
|
246 |
|
|
{
|
247 |
|
|
query.append( ((String[])params.get("meta_file_id"))[0]);
|
248 |
|
|
query.append("</meta_file_id>");
|
249 |
|
|
}
|
250 |
|
|
else
|
251 |
|
|
{
|
252 |
|
|
query.append("unspecified</meta_file_id>");
|
253 |
|
|
}
|
254 |
350
|
berkley
|
|
255 |
342
|
berkley
|
query.append("<querytitle>");
|
256 |
|
|
if(params.containsKey("querytitle"))
|
257 |
|
|
{
|
258 |
|
|
query.append(((String[])params.get("querytitle"))[0]);
|
259 |
|
|
query.append("</querytitle>");
|
260 |
|
|
}
|
261 |
|
|
else
|
262 |
|
|
{
|
263 |
|
|
query.append("unspecified</querytitle>");
|
264 |
|
|
}
|
265 |
372
|
berkley
|
|
266 |
|
|
if(params.containsKey("doctype"))
|
267 |
|
|
{
|
268 |
|
|
doctype = ((String[])params.get("doctype"))[0];
|
269 |
|
|
}
|
270 |
|
|
else
|
271 |
|
|
{
|
272 |
|
|
doctype = "ANY";
|
273 |
|
|
}
|
274 |
|
|
|
275 |
401
|
berkley
|
if(params.containsKey("returnfield"))
|
276 |
|
|
{
|
277 |
|
|
String[] returnfield = ((String[])params.get("returnfield"));
|
278 |
|
|
for(int i=0; i<returnfield.length; i++)
|
279 |
|
|
{
|
280 |
|
|
query.append("<returnfield>").append(returnfield[i]);
|
281 |
|
|
query.append("</returnfield>");
|
282 |
|
|
}
|
283 |
|
|
}
|
284 |
|
|
|
285 |
350
|
berkley
|
//if you don't limit the query by doctype, then it just creates
|
286 |
|
|
//an empty returndoctype tag.
|
287 |
342
|
berkley
|
if (!doctype.equals("any") &&
|
288 |
|
|
!doctype.equals("ANY") &&
|
289 |
|
|
!doctype.equals("") )
|
290 |
|
|
{
|
291 |
|
|
query.append("<returndoctype>");
|
292 |
|
|
query.append(doctype).append("</returndoctype>");
|
293 |
|
|
}
|
294 |
350
|
berkley
|
else
|
295 |
|
|
{
|
296 |
|
|
query.append("<returndoctype></returndoctype>");
|
297 |
|
|
}
|
298 |
|
|
|
299 |
|
|
//allows the dynamic switching of boolean operators
|
300 |
|
|
if(params.containsKey("operator"))
|
301 |
|
|
{
|
302 |
|
|
query.append("<querygroup operator=\"" +
|
303 |
342
|
berkley
|
((String[])params.get("operator"))[0] + "\">");
|
304 |
350
|
berkley
|
}
|
305 |
|
|
else
|
306 |
|
|
{ //the default operator is UNION
|
307 |
|
|
query.append("<querygroup operator=\"UNION\">");
|
308 |
|
|
}
|
309 |
342
|
berkley
|
|
310 |
372
|
berkley
|
if(params.containsKey("casesensitive"))
|
311 |
|
|
{
|
312 |
|
|
casesensitive = ((String[])params.get("casesensitive"))[0];
|
313 |
|
|
}
|
314 |
|
|
else
|
315 |
|
|
{
|
316 |
|
|
casesensitive = "false";
|
317 |
|
|
}
|
318 |
|
|
|
319 |
|
|
if(params.containsKey("searchmode"))
|
320 |
|
|
{
|
321 |
|
|
searchmode = ((String[])params.get("searchmode"))[0];
|
322 |
|
|
}
|
323 |
|
|
else
|
324 |
|
|
{
|
325 |
|
|
searchmode = "contains";
|
326 |
|
|
}
|
327 |
342
|
berkley
|
|
328 |
|
|
//anyfield is a special case because it does a
|
329 |
|
|
//free text search. It does not have a <pathexpr>
|
330 |
350
|
berkley
|
//tag. This allows for a free text search within the structured
|
331 |
|
|
//query. This is useful if the INTERSECT operator is used.
|
332 |
|
|
if(params.containsKey("anyfield"))
|
333 |
342
|
berkley
|
{
|
334 |
372
|
berkley
|
String[] anyfield = ((String[])params.get("anyfield"));
|
335 |
|
|
//allow for more than one value for anyfield
|
336 |
|
|
for(int i=0; i<anyfield.length; i++)
|
337 |
350
|
berkley
|
{
|
338 |
372
|
berkley
|
if(!anyfield[i].equals(""))
|
339 |
|
|
{
|
340 |
|
|
query.append("<queryterm casesensitive=\"" + casesensitive +
|
341 |
|
|
"\" " + "searchmode=\"" + searchmode + "\"><value>" +
|
342 |
|
|
anyfield[i] +
|
343 |
|
|
"</value></queryterm>");
|
344 |
|
|
}
|
345 |
350
|
berkley
|
}
|
346 |
342
|
berkley
|
}
|
347 |
|
|
|
348 |
|
|
//this while loop finds the rest of the parameters
|
349 |
|
|
//and attempts to query for the field specified
|
350 |
|
|
//by the parameter.
|
351 |
|
|
elements = params.elements();
|
352 |
|
|
keys = params.keys();
|
353 |
|
|
while(keys.hasMoreElements() && elements.hasMoreElements())
|
354 |
|
|
{
|
355 |
|
|
nextkey = keys.nextElement();
|
356 |
|
|
nextelement = elements.nextElement();
|
357 |
372
|
berkley
|
|
358 |
342
|
berkley
|
//make sure we aren't querying for any of these
|
359 |
|
|
//parameters since the are already in the query
|
360 |
|
|
//in one form or another.
|
361 |
|
|
if(!nextkey.toString().equals("doctype") &&
|
362 |
|
|
!nextkey.toString().equals("action") &&
|
363 |
|
|
!nextkey.toString().equals("qformat") &&
|
364 |
|
|
!nextkey.toString().equals("anyfield") &&
|
365 |
401
|
berkley
|
!nextkey.toString().equals("returnfield") &&
|
366 |
372
|
berkley
|
!nextkey.toString().equals("operator") )
|
367 |
342
|
berkley
|
{
|
368 |
372
|
berkley
|
//allow for more than value per field name
|
369 |
|
|
for(int i=0; i<((String[])nextelement).length; i++)
|
370 |
|
|
{
|
371 |
|
|
if(!((String[])nextelement)[i].equals(""))
|
372 |
|
|
{
|
373 |
|
|
query.append("<queryterm casesensitive=\"" + casesensitive +"\" " +
|
374 |
|
|
"searchmode=\"" + searchmode + "\">" +
|
375 |
|
|
"<value>" +
|
376 |
|
|
//add the query value
|
377 |
|
|
((String[])nextelement)[i] +
|
378 |
|
|
"</value><pathexpr>" +
|
379 |
|
|
//add the path to query by
|
380 |
|
|
nextkey.toString() +
|
381 |
|
|
"</pathexpr></queryterm>");
|
382 |
|
|
}
|
383 |
|
|
}
|
384 |
342
|
berkley
|
}
|
385 |
|
|
}
|
386 |
|
|
query.append("</querygroup></pathquery>");
|
387 |
350
|
berkley
|
//append on the end of the xml and return the result as a string
|
388 |
342
|
berkley
|
return query.toString();
|
389 |
|
|
}
|
390 |
|
|
|
391 |
181
|
jones
|
/**
|
392 |
|
|
* format a simple free-text value query as an XML document that conforms
|
393 |
|
|
* to the pathquery.dtd and is appropriate for submission to the DBQuery
|
394 |
|
|
* structured query engine
|
395 |
|
|
*
|
396 |
|
|
* @param value the text string to search for in the xml catalog
|
397 |
|
|
* @param doctype the type of documents to include in the result set -- use
|
398 |
|
|
* "any" or "ANY" for unfiltered result sets
|
399 |
|
|
*/
|
400 |
|
|
public static String createQuery(String value, String doctype) {
|
401 |
|
|
StringBuffer xmlquery = new StringBuffer();
|
402 |
|
|
xmlquery.append("<?xml version=\"1.0\"?>\n");
|
403 |
|
|
xmlquery.append("<pathquery version=\"1.0\">");
|
404 |
|
|
xmlquery.append("<meta_file_id>Unspecified</meta_file_id>");
|
405 |
|
|
xmlquery.append("<querytitle>Unspecified</querytitle>");
|
406 |
|
|
|
407 |
|
|
if (!doctype.equals("any") && !doctype.equals("ANY")) {
|
408 |
|
|
xmlquery.append("<returndoctype>");
|
409 |
|
|
xmlquery.append(doctype).append("</returndoctype>");
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
xmlquery.append("<querygroup operator=\"UNION\">");
|
413 |
350
|
berkley
|
//chad added - 8/14
|
414 |
|
|
//the if statement allows a query to gracefully handle a null
|
415 |
|
|
//query. Without this if a nullpointerException is thrown.
|
416 |
|
|
if(!value.equals(""))
|
417 |
|
|
{
|
418 |
|
|
xmlquery.append("<queryterm casesensitive=\"false\" ");
|
419 |
|
|
xmlquery.append("searchmode=\"contains\">");
|
420 |
|
|
xmlquery.append("<value>").append(value).append("</value>");
|
421 |
|
|
xmlquery.append("</queryterm>");
|
422 |
|
|
}
|
423 |
181
|
jones
|
xmlquery.append("</querygroup>");
|
424 |
|
|
xmlquery.append("</pathquery>");
|
425 |
|
|
|
426 |
|
|
|
427 |
|
|
return (xmlquery.toString());
|
428 |
|
|
}
|
429 |
|
|
|
430 |
|
|
/**
|
431 |
|
|
* format a simple free-text value query as an XML document that conforms
|
432 |
|
|
* to the pathquery.dtd and is appropriate for submission to the DBQuery
|
433 |
|
|
* structured query engine
|
434 |
|
|
*
|
435 |
|
|
* @param value the text string to search for in the xml catalog
|
436 |
|
|
*/
|
437 |
|
|
public static String createQuery(String value) {
|
438 |
|
|
return createQuery(value, "any");
|
439 |
|
|
}
|
440 |
155
|
jones
|
}
|
441 |
203
|
jones
|
|
442 |
|
|
/**
|
443 |
|
|
* '$Log$
|
444 |
423
|
berkley
|
* 'Revision 1.16 2000/08/23 22:55:25 berkley
|
445 |
|
|
* 'changed the field names to be case-sensitive in the returnfields
|
446 |
|
|
* '
|
447 |
405
|
berkley
|
* 'Revision 1.15 2000/08/23 17:22:07 berkley
|
448 |
|
|
* 'added support for the returnfield parameter
|
449 |
|
|
* '-added the dynamic parameters to the returned hash table of documents
|
450 |
|
|
* '
|
451 |
401
|
berkley
|
* 'Revision 1.14 2000/08/17 16:02:34 berkley
|
452 |
|
|
* 'Made changes to createSQuery to allow for multiple parameters of the same name. Also changed the param list to include only "Hashtable params" without a "String doctype" since the doctype is already contained in the params.
|
453 |
|
|
* '
|
454 |
372
|
berkley
|
* 'Revision 1.13 2000/08/14 21:26:12 berkley
|
455 |
|
|
* 'Added createSQuery() to handle structured queries of an arbitrary number of parameters. Also modified createQuery() to handle a null query in a graceful manner.
|
456 |
|
|
* '
|
457 |
350
|
berkley
|
* 'Revision 1.12 2000/08/14 20:53:33 jones
|
458 |
|
|
* 'Added "release" keyword to all metacat source files so that the release
|
459 |
|
|
* 'number will be evident in software distributions.
|
460 |
|
|
* '
|
461 |
349
|
jones
|
* 'Revision 1.11 2000/08/11 18:26:07 berkley
|
462 |
|
|
* 'added createSQuery
|
463 |
|
|
* '
|
464 |
342
|
berkley
|
* 'Revision 1.10 2000/07/26 20:40:41 higgins
|
465 |
|
|
* 'no message
|
466 |
|
|
* '
|
467 |
296
|
higgins
|
* 'Revision 1.9 2000/06/26 10:35:04 jones
|
468 |
|
|
* 'Merged in substantial changes to DBWriter and associated classes and to
|
469 |
|
|
* 'the MetaCatServlet in order to accomodate the new UPDATE and DELETE
|
470 |
|
|
* 'functions. The command line tools and the parameters for the
|
471 |
|
|
* 'servlet have changed substantially.
|
472 |
|
|
* '
|
473 |
203
|
jones
|
* 'Revision 1.8.2.2 2000/06/25 23:38:16 jones
|
474 |
|
|
* 'Added RCSfile keyword
|
475 |
|
|
* '
|
476 |
|
|
* 'Revision 1.8.2.1 2000/06/25 23:34:17 jones
|
477 |
|
|
* 'Changed documentation formatting, added log entries at bottom of source files
|
478 |
|
|
* ''
|
479 |
|
|
*/
|