1
|
/**
|
2
|
* '$RCSfile$'
|
3
|
* Purpose: A Class that implements utility methods like:
|
4
|
* 1/ Reding all doctypes from db connection
|
5
|
* 2/ Reading Lore type Data Guide from db connection
|
6
|
* Copyright: 2000 Regents of the University of California and the
|
7
|
* National Center for Ecological Analysis and Synthesis
|
8
|
* Authors: Jivka Bojilova
|
9
|
* Release: @release@
|
10
|
*
|
11
|
* '$Author: berkley $'
|
12
|
* '$Date: 2001-01-18 15:15:21 -0800 (Thu, 18 Jan 2001) $'
|
13
|
* '$Revision: 675 $'
|
14
|
*
|
15
|
* This program is free software; you can redistribute it and/or modify
|
16
|
* it under the terms of the GNU General Public License as published by
|
17
|
* the Free Software Foundation; either version 2 of the License, or
|
18
|
* (at your option) any later version.
|
19
|
*
|
20
|
* This program is distributed in the hope that it will be useful,
|
21
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
22
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
23
|
* GNU General Public License for more details.
|
24
|
*
|
25
|
* You should have received a copy of the GNU General Public License
|
26
|
* along with this program; if not, write to the Free Software
|
27
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
28
|
*/
|
29
|
|
30
|
package edu.ucsb.nceas.metacat;
|
31
|
|
32
|
import java.sql.Connection;
|
33
|
import java.sql.SQLException;
|
34
|
import java.sql.PreparedStatement;
|
35
|
import java.sql.ResultSet;
|
36
|
import java.util.Enumeration;
|
37
|
import java.util.Vector;
|
38
|
import java.util.Stack;
|
39
|
|
40
|
/**
|
41
|
* A suite of utility classes for quering DB
|
42
|
*/
|
43
|
public class DBUtil {
|
44
|
|
45
|
private Connection conn = null;
|
46
|
|
47
|
/**
|
48
|
* main routine used for testing.
|
49
|
* <p>
|
50
|
* Usage: java DBUtil <-dt|-dg>
|
51
|
*
|
52
|
* @param -dt for selecting all doctypes
|
53
|
* -dg for selecting DataGuide
|
54
|
*/
|
55
|
static public void main(String[] args) {
|
56
|
|
57
|
if (args.length < 1)
|
58
|
{
|
59
|
System.err.println("Wrong number of arguments!!!");
|
60
|
System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
|
61
|
return;
|
62
|
} else {
|
63
|
try {
|
64
|
|
65
|
// Open a connection to the database
|
66
|
MetaCatUtil util = new MetaCatUtil();
|
67
|
Connection dbconn = util.openDBConnection();
|
68
|
|
69
|
DBUtil dbutil = new DBUtil( dbconn );
|
70
|
|
71
|
if ( args[0].equals("-dt") ) {
|
72
|
String doctypes = dbutil.readDoctypes();
|
73
|
System.out.println(doctypes);
|
74
|
} else if ( args[0].equals("-dg") ) {
|
75
|
String doctype = null;
|
76
|
if ( args.length == 2 ) { doctype = args[1]; }
|
77
|
String dataguide = dbutil.readDataGuide(doctype);
|
78
|
System.out.println(dataguide);
|
79
|
} else {
|
80
|
System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
|
81
|
}
|
82
|
|
83
|
} catch (Exception e) {
|
84
|
System.err.println("error in DBUtil.main");
|
85
|
System.err.println(e.getMessage());
|
86
|
e.printStackTrace(System.err);
|
87
|
}
|
88
|
}
|
89
|
}
|
90
|
|
91
|
/**
|
92
|
* Construct an instance of the utility class
|
93
|
*/
|
94
|
public DBUtil( Connection conn ) {
|
95
|
this.conn = conn;
|
96
|
}
|
97
|
|
98
|
/**
|
99
|
* read all doctypes from db connection in XML format
|
100
|
* select all Public Id from xml_catalog table
|
101
|
*/
|
102
|
public String readDoctypes()
|
103
|
throws SQLException {
|
104
|
|
105
|
Vector doctypeList = new Vector();
|
106
|
|
107
|
try {
|
108
|
|
109
|
PreparedStatement pstmt =
|
110
|
conn.prepareStatement("SELECT public_id FROM xml_catalog " +
|
111
|
"WHERE entry_type = 'DTD'");
|
112
|
|
113
|
pstmt.execute();
|
114
|
ResultSet rs = pstmt.getResultSet();
|
115
|
boolean tableHasRows = rs.next();
|
116
|
while (tableHasRows) {
|
117
|
doctypeList.addElement(rs.getString(1));
|
118
|
tableHasRows = rs.next();
|
119
|
}
|
120
|
|
121
|
pstmt.close();
|
122
|
|
123
|
} catch (SQLException e) {
|
124
|
System.out.println("DBUtil.readDoctypes(): " + e.getMessage());
|
125
|
throw e;
|
126
|
}
|
127
|
|
128
|
return formatToXML(doctypeList, "doctype");
|
129
|
}
|
130
|
|
131
|
/**
|
132
|
* read Data Guide for a given doctype from db connection in XML format
|
133
|
* select all distinct absolute paths from xml_index table
|
134
|
*/
|
135
|
public String readDataGuide( String doctype )
|
136
|
throws SQLException {
|
137
|
|
138
|
Vector dataguide = new Vector();
|
139
|
String path;
|
140
|
PreparedStatement pstmt;
|
141
|
|
142
|
try {
|
143
|
|
144
|
if ( doctype != null ) {
|
145
|
pstmt = conn.prepareStatement("SELECT distinct path, nodeid " +
|
146
|
"FROM xml_index " +
|
147
|
"WHERE path LIKE '/%' " +
|
148
|
"AND doctype LIKE ? " +
|
149
|
"ORDER BY nodeid");
|
150
|
pstmt.setString(1, doctype);
|
151
|
} else {
|
152
|
pstmt = conn.prepareStatement("SELECT distinct path, doctype, nodeid " +
|
153
|
"FROM xml_index " +
|
154
|
"WHERE path LIKE '/%' " +
|
155
|
"ORDER BY doctype, nodeid");
|
156
|
}
|
157
|
|
158
|
pstmt.execute();
|
159
|
ResultSet rs = pstmt.getResultSet();
|
160
|
boolean tableHasRows = rs.next();
|
161
|
while (tableHasRows) {
|
162
|
path = rs.getString(1);
|
163
|
if ( dataguide.indexOf(path) == -1 ) {
|
164
|
dataguide.addElement(path);
|
165
|
}
|
166
|
tableHasRows = rs.next();
|
167
|
}
|
168
|
|
169
|
pstmt.close();
|
170
|
|
171
|
} catch (SQLException e) {
|
172
|
System.out.println("DBUtil.readDataGuide(): " + e.getMessage());
|
173
|
throw e;
|
174
|
}
|
175
|
|
176
|
return formatToXML(dataguide);
|
177
|
}
|
178
|
|
179
|
/**
|
180
|
* format the DataGuide ResultSet to XML
|
181
|
*/
|
182
|
private String formatToXML(Vector resultset) {
|
183
|
|
184
|
String currPath = null;
|
185
|
String currElement = null;
|
186
|
String prevElement = null;
|
187
|
StringBuffer result = new StringBuffer();
|
188
|
Enumeration rs = resultset.elements();
|
189
|
Stack st = new Stack();
|
190
|
int i = 0;
|
191
|
|
192
|
result.append("<?xml version=\"1.0\"?>\n");
|
193
|
result.append("<resultset>\n");
|
194
|
|
195
|
while (rs.hasMoreElements()) {
|
196
|
currPath = (String)rs.nextElement();
|
197
|
while ( !In(prevElement, currPath) ) {
|
198
|
currElement = (String)st.pop();
|
199
|
result.append(pad(" ",i--) + "</" + currElement + ">\n");
|
200
|
if ( st.empty() )
|
201
|
prevElement = null;
|
202
|
else
|
203
|
prevElement = (String)st.peek();
|
204
|
}
|
205
|
currElement = getElementFromPath(currPath);
|
206
|
st.push(currElement);
|
207
|
result.append(pad(" ",++i) + "<" + currElement + ">\n");
|
208
|
prevElement = currElement;
|
209
|
}
|
210
|
while ( !st.empty() ) {
|
211
|
prevElement = (String)st.pop();
|
212
|
result.append(pad(" ",i--) + "</" + prevElement + ">\n");
|
213
|
}
|
214
|
result.append("</resultset>\n");
|
215
|
|
216
|
return result.toString();
|
217
|
}
|
218
|
|
219
|
/**
|
220
|
* check if element is in path like /elem1/elem2/elemn3
|
221
|
*/
|
222
|
private boolean In(String element, String path) {
|
223
|
|
224
|
if ( element == null ) return true;
|
225
|
return ( path.indexOf(element) != -1 );
|
226
|
}
|
227
|
|
228
|
/**
|
229
|
* get last element from path like /elem1/elem2/elemn3
|
230
|
*/
|
231
|
private String getElementFromPath(String path) {
|
232
|
|
233
|
return ( path.substring(path.lastIndexOf("/")+1) );
|
234
|
}
|
235
|
|
236
|
/**
|
237
|
* repeates the str n-times
|
238
|
*/
|
239
|
private String pad(String str, int n) {
|
240
|
|
241
|
String result = "";
|
242
|
for ( int i = 0; i < n; i++ )
|
243
|
result = result.concat(str);
|
244
|
|
245
|
return result;
|
246
|
}
|
247
|
|
248
|
/**
|
249
|
* format the ResultSet to XML
|
250
|
*/
|
251
|
private String formatToXML(Vector resultset, String tag) {
|
252
|
|
253
|
String val = null;
|
254
|
StringBuffer result = new StringBuffer();
|
255
|
Enumeration rs = resultset.elements();
|
256
|
|
257
|
result.append("<?xml version=\"1.0\"?>\n");
|
258
|
result.append("<resultset>\n");
|
259
|
while (rs.hasMoreElements()) {
|
260
|
val = (String)rs.nextElement();
|
261
|
result.append(" <" + tag + ">" + val + "</" + tag + ">\n");
|
262
|
}
|
263
|
result.append("</resultset>\n");
|
264
|
|
265
|
return result.toString();
|
266
|
}
|
267
|
|
268
|
|
269
|
}
|