| 1 |
21
|
jones
|
/**
|
| 2 |
|
|
* Name: ReaderElement.java
|
| 3 |
|
|
* Purpose: A Class that represents an XML element and its contents,
|
| 4 |
|
|
* and can build itself from a database connection
|
| 5 |
35
|
jones
|
* Copyright: 2000 Regents of the University of California and the
|
| 6 |
|
|
* National Center for Ecological Analysis and Synthesis
|
| 7 |
21
|
jones
|
* Authors: Matt Jones
|
| 8 |
|
|
*
|
| 9 |
|
|
* Version: '$Id$'
|
| 10 |
|
|
*/
|
| 11 |
|
|
|
| 12 |
51
|
jones
|
package edu.ucsb.nceas.metacat;
|
| 13 |
21
|
jones
|
|
| 14 |
|
|
import java.sql.*;
|
| 15 |
|
|
import java.io.IOException;
|
| 16 |
23
|
jones
|
import java.util.Vector;
|
| 17 |
21
|
jones
|
import java.util.Enumeration;
|
| 18 |
|
|
|
| 19 |
31
|
jones
|
/**
|
| 20 |
|
|
* A Class that represents an XML element and its contents,
|
| 21 |
|
|
* and can build itself from a database connection
|
| 22 |
|
|
*/
|
| 23 |
21
|
jones
|
public class ReaderElement extends BasicElement {
|
| 24 |
|
|
|
| 25 |
23
|
jones
|
private Connection conn;
|
| 26 |
|
|
private Vector children;
|
| 27 |
21
|
jones
|
|
| 28 |
31
|
jones
|
/**
|
| 29 |
|
|
* Construct a new ReaderElement instance
|
| 30 |
|
|
*
|
| 31 |
|
|
* @param conn the database connection to use to initialize
|
| 32 |
|
|
*/
|
| 33 |
24
|
jones
|
public ReaderElement (Connection conn) {
|
| 34 |
|
|
this.conn = conn;
|
| 35 |
|
|
this.children = new Vector();
|
| 36 |
|
|
}
|
| 37 |
|
|
|
| 38 |
31
|
jones
|
/**
|
| 39 |
|
|
* Construct a new ReaderElement instance
|
| 40 |
|
|
*
|
| 41 |
|
|
* @param conn the database connection to use to initialize
|
| 42 |
|
|
* @param nodeid the element_id for the node to be created
|
| 43 |
|
|
*/
|
| 44 |
21
|
jones
|
public ReaderElement (Connection conn, long nodeid) {
|
| 45 |
24
|
jones
|
this(conn);
|
| 46 |
21
|
jones
|
|
| 47 |
|
|
//Lookup data for self
|
| 48 |
24
|
jones
|
setElementInfo(nodeid);
|
| 49 |
21
|
jones
|
|
| 50 |
24
|
jones
|
//Create child nodes (elements or attributes)
|
| 51 |
|
|
setChildrenNodes(nodeid);
|
| 52 |
|
|
}
|
| 53 |
21
|
jones
|
|
| 54 |
31
|
jones
|
/**
|
| 55 |
|
|
* Construct a new ReaderElement instance
|
| 56 |
|
|
*
|
| 57 |
|
|
* @param conn the database connection to use to initialize
|
| 58 |
|
|
* @param nodeid the element_id for the node to be created
|
| 59 |
|
|
* @param parentnodeid the id of the parent node
|
| 60 |
|
|
* @param nodename the name of the element
|
| 61 |
|
|
* @param nodedata the text content of the node
|
| 62 |
|
|
*/
|
| 63 |
24
|
jones
|
public ReaderElement (Connection conn, long nodeid, long parentnodeid,
|
| 64 |
|
|
String nodename, String nodedata) {
|
| 65 |
|
|
this(conn);
|
| 66 |
|
|
setElementID(nodeid);
|
| 67 |
|
|
setParentID(parentnodeid);
|
| 68 |
|
|
setTagName(nodename);
|
| 69 |
|
|
appendContent(nodedata);
|
| 70 |
|
|
|
| 71 |
|
|
// Create child nodes (elements or attributes)
|
| 72 |
|
|
setChildrenNodes(nodeid);
|
| 73 |
21
|
jones
|
}
|
| 74 |
23
|
jones
|
|
| 75 |
24
|
jones
|
/** Look up the info needed to construct this element from the DB */
|
| 76 |
|
|
private void setElementInfo(long nodeid) {
|
| 77 |
23
|
jones
|
long element_id=0;
|
| 78 |
|
|
long parentnodeid=0;
|
| 79 |
|
|
String nodetype=null;
|
| 80 |
|
|
String nodename=null;
|
| 81 |
|
|
String nodedata=null;
|
| 82 |
|
|
|
| 83 |
|
|
PreparedStatement pstmt;
|
| 84 |
|
|
try {
|
| 85 |
|
|
pstmt =
|
| 86 |
96
|
jones
|
conn.prepareStatement("SELECT nodeid,parentnodeid,nodetype,nodename,"+
|
| 87 |
|
|
"replace(" +
|
| 88 |
|
|
"replace(" +
|
| 89 |
|
|
"replace(nodedata,'&','&') " +
|
| 90 |
|
|
",'<','<') " +
|
| 91 |
|
|
",'>','>') " +
|
| 92 |
|
|
"FROM xml_nodes WHERE nodeid = ?");
|
| 93 |
23
|
jones
|
// Bind the values to the query
|
| 94 |
|
|
pstmt.setLong(1, nodeid);
|
| 95 |
|
|
|
| 96 |
|
|
pstmt.execute();
|
| 97 |
|
|
try {
|
| 98 |
|
|
ResultSet rs = pstmt.getResultSet();
|
| 99 |
|
|
try {
|
| 100 |
|
|
boolean tableHasRows = rs.next();
|
| 101 |
|
|
if (tableHasRows) {
|
| 102 |
|
|
try {
|
| 103 |
|
|
element_id = rs.getLong(1);
|
| 104 |
|
|
parentnodeid = rs.getLong(2);
|
| 105 |
|
|
nodetype = rs.getString(3);
|
| 106 |
|
|
nodename = rs.getString(4);
|
| 107 |
|
|
nodedata = rs.getString(5);
|
| 108 |
|
|
} catch (SQLException e) {
|
| 109 |
|
|
System.out.println("Error with getInt: " + e.getMessage());
|
| 110 |
|
|
}
|
| 111 |
|
|
}
|
| 112 |
|
|
} catch (SQLException e) {
|
| 113 |
|
|
System.out.println("Error with next: " + e.getMessage());
|
| 114 |
|
|
}
|
| 115 |
|
|
} catch (SQLException e) {
|
| 116 |
|
|
System.out.println("Error with getrset: " + e.getMessage());
|
| 117 |
|
|
}
|
| 118 |
|
|
pstmt.close();
|
| 119 |
|
|
} catch (SQLException e) {
|
| 120 |
|
|
System.out.println("Error getting id: " + e.getMessage());
|
| 121 |
|
|
}
|
| 122 |
|
|
|
| 123 |
|
|
if (nodetype.equals("ELEMENT")) {
|
| 124 |
|
|
setElementID(element_id);
|
| 125 |
|
|
setParentID(parentnodeid);
|
| 126 |
|
|
setTagName(nodename);
|
| 127 |
24
|
jones
|
appendContent(nodedata);
|
| 128 |
23
|
jones
|
}
|
| 129 |
|
|
}
|
| 130 |
24
|
jones
|
|
| 131 |
|
|
/** Look up each child node from the DB and and create it */
|
| 132 |
|
|
private void setChildrenNodes(long nodeid) {
|
| 133 |
|
|
long element_id=0;
|
| 134 |
|
|
long parentnodeid=0;
|
| 135 |
|
|
String nodetype=null;
|
| 136 |
|
|
String nodename=null;
|
| 137 |
|
|
String nodedata=null;
|
| 138 |
|
|
|
| 139 |
|
|
PreparedStatement pstmt;
|
| 140 |
|
|
try {
|
| 141 |
|
|
pstmt =
|
| 142 |
|
|
conn.prepareStatement("SELECT nodeid,parentnodeid,nodetype, " +
|
| 143 |
96
|
jones
|
"nodename, " +
|
| 144 |
|
|
"replace(" +
|
| 145 |
|
|
"replace(" +
|
| 146 |
|
|
"replace(nodedata,'&','&')" +
|
| 147 |
|
|
",'<','<') " +
|
| 148 |
|
|
",'>','>') " +
|
| 149 |
|
|
"FROM xml_nodes WHERE parentnodeid = ?");
|
| 150 |
24
|
jones
|
// Bind the values to the query
|
| 151 |
|
|
pstmt.setLong(1, nodeid);
|
| 152 |
|
|
|
| 153 |
|
|
pstmt.execute();
|
| 154 |
|
|
try {
|
| 155 |
|
|
ResultSet rs = pstmt.getResultSet();
|
| 156 |
|
|
try {
|
| 157 |
|
|
boolean tableHasRows = rs.next();
|
| 158 |
|
|
while (tableHasRows) {
|
| 159 |
|
|
try {
|
| 160 |
|
|
element_id = rs.getLong(1);
|
| 161 |
|
|
parentnodeid = rs.getLong(2);
|
| 162 |
|
|
nodetype = rs.getString(3);
|
| 163 |
|
|
nodename = rs.getString(4);
|
| 164 |
|
|
nodedata = rs.getString(5);
|
| 165 |
|
|
|
| 166 |
|
|
if (nodetype.equals("ELEMENT")) {
|
| 167 |
|
|
ReaderElement child = new ReaderElement(conn,
|
| 168 |
|
|
element_id,parentnodeid,nodename,nodedata);
|
| 169 |
|
|
children.add(child);
|
| 170 |
|
|
} else if (nodetype.equals("ATTRIBUTE")) {
|
| 171 |
|
|
setAttribute(nodename,nodedata);
|
| 172 |
|
|
}
|
| 173 |
|
|
|
| 174 |
|
|
} catch (SQLException e) {
|
| 175 |
|
|
System.out.println("Error with getInt: " + e.getMessage());
|
| 176 |
|
|
}
|
| 177 |
|
|
|
| 178 |
|
|
// Advance to the next record in the cursor
|
| 179 |
|
|
tableHasRows = rs.next();
|
| 180 |
|
|
}
|
| 181 |
|
|
} catch (SQLException e) {
|
| 182 |
|
|
System.out.println("Error with next: " + e.getMessage());
|
| 183 |
|
|
}
|
| 184 |
|
|
} catch (SQLException e) {
|
| 185 |
|
|
System.out.println("Error with getrset: " + e.getMessage());
|
| 186 |
|
|
}
|
| 187 |
|
|
pstmt.close();
|
| 188 |
|
|
} catch (SQLException e) {
|
| 189 |
|
|
System.out.println("Error getting id: " + e.getMessage());
|
| 190 |
|
|
}
|
| 191 |
|
|
|
| 192 |
|
|
}
|
| 193 |
|
|
|
| 194 |
31
|
jones
|
/**
|
| 195 |
|
|
* String representation for display purposes (recursively descends through
|
| 196 |
|
|
* children to create an XML subtree)
|
| 197 |
|
|
*/
|
| 198 |
24
|
jones
|
public String toString ()
|
| 199 |
|
|
{
|
| 200 |
|
|
StringBuffer value = new StringBuffer();
|
| 201 |
|
|
value.append('<');
|
| 202 |
|
|
value.append(getTagName());
|
| 203 |
|
|
value.append(getAttributes().toString());
|
| 204 |
|
|
value.append('>');
|
| 205 |
|
|
|
| 206 |
|
|
// Process children recursively here
|
| 207 |
|
|
// Or do it in ReaderElement using a stack so we don;t have the
|
| 208 |
|
|
// whole thing in memory at once?
|
| 209 |
|
|
ReaderElement child = null;
|
| 210 |
|
|
Enumeration e = children.elements();
|
| 211 |
|
|
while (e.hasMoreElements()) {
|
| 212 |
|
|
child = (ReaderElement)e.nextElement();
|
| 213 |
|
|
value.append(child);
|
| 214 |
|
|
}
|
| 215 |
|
|
|
| 216 |
|
|
String cont = getContent();
|
| 217 |
|
|
if (!cont.equals("null")) {
|
| 218 |
|
|
value.append(cont);
|
| 219 |
|
|
}
|
| 220 |
|
|
|
| 221 |
|
|
value.append("</");
|
| 222 |
|
|
value.append(getTagName());
|
| 223 |
|
|
value.append('>');
|
| 224 |
|
|
return value.toString();
|
| 225 |
|
|
}
|
| 226 |
21
|
jones
|
}
|