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jones
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/**
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203
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jones
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* '$RCSfile$'
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* Purpose: A Class that represents an XML node and its contents
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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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15
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jones
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*
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203
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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669
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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15
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jones
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*/
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75
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jones
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package edu.ucsb.nceas.metacat;
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15
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jones
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import java.sql.*;
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import java.io.IOException;
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import java.util.Hashtable;
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import java.util.Enumeration;
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34 |
457
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bojilova
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import oracle.jdbc.driver.*;
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461
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bojilova
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import org.xml.sax.SAXException;
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15
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jones
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31
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jones
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/**
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137
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jones
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* A Class that represents an XML node and its contents and
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31
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jones
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* can write its own representation to a database connection
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*/
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137
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jones
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public class DBSAXNode extends BasicNode {
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15
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jones
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176
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jones
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private Connection conn;
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private DBSAXNode parentNode;
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15
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jones
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133
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jones
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/**
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136
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jones
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* Construct a new node instance for DOCUMENT nodes
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133
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jones
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*
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* @param conn the JDBC Connection to which all information is written
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*/
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461
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bojilova
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public DBSAXNode (Connection conn, String docid) throws SAXException {
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408
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jones
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super();
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136
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jones
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this.conn = conn;
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176
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jones
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this.parentNode = null;
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457
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bojilova
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writeChildNodeToDB("DOCUMENT", null, null, docid);
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136
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jones
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}
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/**
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* Construct a new node instance for ELEMENT nodes
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*
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* @param conn the JDBC Connection to which all information is written
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* @param tagname the name of the node
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* @param parentNode the parent node for this node being created
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*/
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176
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jones
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public DBSAXNode (Connection conn, String tagname, DBSAXNode parentNode,
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461
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bojilova
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long rootnodeid, String docid, String doctype)
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throws SAXException {
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21
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jones
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136
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jones
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super(tagname);
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setParentID(parentNode.getNodeID());
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457
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bojilova
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setRootNodeID(rootnodeid);
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setDocID(docid);
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136
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jones
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setNodeIndex(parentNode.incChildNum());
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this.conn = conn;
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this.parentNode = parentNode;
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bojilova
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writeChildNodeToDB("ELEMENT", getTagName(), null, docid);
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471
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bojilova
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//No writing XML Index from here. New Thread used instead.
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//updateNodeIndex(docid, doctype);
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133
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jones
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}
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15
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jones
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133
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jones
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/** creates SQL code and inserts new node into DB connection */
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public void writeChildNodeToDB(String nodetype, String nodename,
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461
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bojilova
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String data, String docid)
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throws SAXException {
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133
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jones
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try {
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PreparedStatement pstmt;
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if (nodetype == "DOCUMENT") {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_nodes " +
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457
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bojilova
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"(nodeid, nodetype, nodename, docid, rootnodeid) " +
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"VALUES (?, ?, ?, ?, ?)");
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204
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jones
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MetaCatUtil.debugMessage("INSERTING DOCNAME: " + nodename);
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133
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jones
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} else {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_nodes " +
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457
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bojilova
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"(nodeid, nodetype, nodename, docid, " +
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"rootnodeid, parentnodeid, nodedata, nodeindex) " +
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174
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bojilova
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"VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
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133
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jones
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}
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19
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jones
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133
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jones
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// Bind the values to the query
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176
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jones
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long nid = generateNodeID();
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174
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bojilova
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pstmt.setLong(1, nid);
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pstmt.setString(2, nodetype);
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pstmt.setString(3, nodename);
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457
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bojilova
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pstmt.setString(4, docid);
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408
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jones
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if (nodetype == "DOCUMENT") {
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457
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bojilova
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pstmt.setLong(5, nid);
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408
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jones
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} else {
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133
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jones
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if (nodetype == "ELEMENT") {
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457
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bojilova
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pstmt.setLong(5, getRootNodeID());
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pstmt.setLong(6, getParentID());
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174
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bojilova
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pstmt.setString(7, data);
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pstmt.setInt(8, getNodeIndex());
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133
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jones
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} else {
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457
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bojilova
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pstmt.setLong(5, getRootNodeID());
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pstmt.setLong(6, getNodeID());
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452
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bojilova
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if ( nodetype == "TEXT" && getTagName().equals("meta_file_id") ) {
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pstmt.setString(7, getDocID());
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} else {
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pstmt.setString(7, data);
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}
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174
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bojilova
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pstmt.setInt(8, incChildNum());
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72
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bojilova
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}
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133
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jones
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}
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126 |
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// Do the insertion
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127 |
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pstmt.execute();
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128 |
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pstmt.close();
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129 |
174
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bojilova
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130 |
408
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jones
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if (nodetype.equals("DOCUMENT")) {
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131 |
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// Record the root node id that was generated from the database
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132 |
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setRootNodeID(nid);
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133 |
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}
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134 |
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135 |
177
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jones
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if (nodetype.equals("DOCUMENT") || nodetype.equals("ELEMENT")) {
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136 |
176
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jones
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137 |
177
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jones
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// Record the node id that was generated from the database
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138 |
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setNodeID(nid);
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139 |
176
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jones
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177
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jones
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// Record the node type that was passed to the method
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141 |
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setNodeType(nodetype);
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142 |
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143 |
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}
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144 |
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145 |
133
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jones
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} catch (SQLException e) {
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146 |
675
|
berkley
|
System.out.println("Error in DBSaxNode.writeChildNodeToDB");
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147 |
133
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jones
|
System.err.println("Error inserting node: (" + nodetype + ", " +
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148 |
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nodename + ", " +
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149 |
136
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jones
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data + ")" );
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150 |
133
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jones
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System.err.println(e.getMessage());
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151 |
461
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bojilova
|
throw new SAXException(e.getMessage());
|
152 |
110
|
bojilova
|
}
|
153 |
133
|
jones
|
}
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154 |
110
|
bojilova
|
|
155 |
133
|
jones
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/**
|
156 |
|
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* creates SQL code to put nodename for the document node
|
157 |
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* into DB connection
|
158 |
|
|
*/
|
159 |
461
|
bojilova
|
public void writeNodename(String nodename) throws SAXException {
|
160 |
133
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jones
|
try {
|
161 |
|
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PreparedStatement pstmt;
|
162 |
|
|
pstmt = conn.prepareStatement(
|
163 |
|
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"UPDATE xml_nodes set nodename = ? " +
|
164 |
|
|
"WHERE nodeid = ?");
|
165 |
16
|
jones
|
|
166 |
133
|
jones
|
// Bind the values to the query
|
167 |
|
|
pstmt.setString(1, nodename);
|
168 |
134
|
jones
|
pstmt.setLong(2, getNodeID());
|
169 |
133
|
jones
|
// Do the insertion
|
170 |
|
|
pstmt.execute();
|
171 |
|
|
pstmt.close();
|
172 |
|
|
} catch (SQLException e) {
|
173 |
675
|
berkley
|
System.out.println("Error in DBSaxNode.writeNodeName: " +
|
174 |
|
|
e.getMessage());
|
175 |
461
|
bojilova
|
throw new SAXException(e.getMessage());
|
176 |
133
|
jones
|
}
|
177 |
|
|
}
|
178 |
16
|
jones
|
|
179 |
174
|
bojilova
|
/** get next node id from DB connection */
|
180 |
461
|
bojilova
|
private long generateNodeID() throws SAXException {
|
181 |
174
|
bojilova
|
long nid=0;
|
182 |
133
|
jones
|
Statement stmt;
|
183 |
|
|
try {
|
184 |
|
|
stmt = conn.createStatement();
|
185 |
174
|
bojilova
|
stmt.execute("SELECT xml_nodes_id_seq.nextval FROM dual");
|
186 |
133
|
jones
|
ResultSet rs = stmt.getResultSet();
|
187 |
|
|
boolean tableHasRows = rs.next();
|
188 |
|
|
if (tableHasRows) {
|
189 |
174
|
bojilova
|
nid = rs.getLong(1);
|
190 |
19
|
jones
|
}
|
191 |
133
|
jones
|
stmt.close();
|
192 |
|
|
} catch (SQLException e) {
|
193 |
675
|
berkley
|
System.out.println("Error in DBSaxNode.generateNodeID: " +
|
194 |
|
|
e.getMessage());
|
195 |
461
|
bojilova
|
throw new SAXException(e.getMessage());
|
196 |
15
|
jones
|
}
|
197 |
|
|
|
198 |
174
|
bojilova
|
return nid;
|
199 |
133
|
jones
|
}
|
200 |
18
|
jones
|
|
201 |
137
|
jones
|
/** Add a new attribute to this node, or set its value */
|
202 |
461
|
bojilova
|
public void setAttribute(String attName, String attValue, String docid)
|
203 |
|
|
throws SAXException {
|
204 |
133
|
jones
|
if (attName != null) {
|
205 |
|
|
// Enter the attribute in the hash table
|
206 |
|
|
super.setAttribute(attName, attValue);
|
207 |
18
|
jones
|
|
208 |
133
|
jones
|
// And enter the attribute in the database
|
209 |
457
|
bojilova
|
writeChildNodeToDB("ATTRIBUTE", attName, attValue, docid);
|
210 |
133
|
jones
|
} else {
|
211 |
|
|
System.err.println("Attribute name must not be null!");
|
212 |
461
|
bojilova
|
throw new SAXException("Attribute name must not be null!");
|
213 |
18
|
jones
|
}
|
214 |
133
|
jones
|
}
|
215 |
176
|
jones
|
|
216 |
|
|
/**
|
217 |
471
|
bojilova
|
* NOT USED
|
218 |
176
|
jones
|
* Update the node index (xml_index) for this node by generating
|
219 |
|
|
* test strings that represent all of the relative and absolute
|
220 |
|
|
* paths through the XML tree from document root to this node
|
221 |
|
|
*/
|
222 |
461
|
bojilova
|
private void updateNodeIndex(String docid, String doctype)
|
223 |
|
|
throws SAXException
|
224 |
|
|
{
|
225 |
176
|
jones
|
Hashtable pathlist = new Hashtable();
|
226 |
|
|
boolean atStartingNode = true;
|
227 |
|
|
boolean atRootDocumentNode = false;
|
228 |
|
|
DBSAXNode nodePointer = this;
|
229 |
|
|
StringBuffer currentPath = new StringBuffer();
|
230 |
457
|
bojilova
|
int counter = 0;
|
231 |
176
|
jones
|
|
232 |
|
|
// Create a Hashtable of all of the paths to reach this node
|
233 |
|
|
// including absolute paths and relative paths
|
234 |
|
|
while (!atRootDocumentNode) {
|
235 |
|
|
if (atStartingNode) {
|
236 |
|
|
currentPath.insert(0, nodePointer.getTagName());
|
237 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
238 |
457
|
bojilova
|
counter++;
|
239 |
176
|
jones
|
atStartingNode = false;
|
240 |
|
|
} else {
|
241 |
|
|
currentPath.insert(0, "/");
|
242 |
|
|
currentPath.insert(0, nodePointer.getTagName());
|
243 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
244 |
457
|
bojilova
|
counter++;
|
245 |
176
|
jones
|
}
|
246 |
|
|
|
247 |
|
|
// advance to the next parent node
|
248 |
|
|
nodePointer = nodePointer.getParentNode();
|
249 |
|
|
|
250 |
|
|
// If we're at the DOCUMENT node (root of DOM tree), add
|
251 |
|
|
// the root "/" to make the absolute path
|
252 |
|
|
if (nodePointer.getNodeType().equals("DOCUMENT")) {
|
253 |
|
|
currentPath.insert(0, "/");
|
254 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
255 |
457
|
bojilova
|
counter++;
|
256 |
176
|
jones
|
atRootDocumentNode = true;
|
257 |
|
|
}
|
258 |
|
|
}
|
259 |
|
|
|
260 |
|
|
try {
|
261 |
|
|
// Create an insert statement to reuse for all of the path insertions
|
262 |
|
|
PreparedStatement pstmt = conn.prepareStatement(
|
263 |
449
|
berkley
|
"INSERT INTO xml_index (nodeid, path, docid, doctype, " +
|
264 |
|
|
"parentnodeid) " +
|
265 |
|
|
"VALUES (?, ?, ?, ?, ?)");
|
266 |
457
|
bojilova
|
((OraclePreparedStatement)pstmt).setExecuteBatch(counter);
|
267 |
176
|
jones
|
|
268 |
314
|
bojilova
|
pstmt.setString(3, docid);
|
269 |
|
|
pstmt.setString(4, doctype);
|
270 |
449
|
berkley
|
pstmt.setLong(5, getParentID());
|
271 |
314
|
bojilova
|
|
272 |
176
|
jones
|
// Step through the hashtable and insert each of the path values
|
273 |
471
|
bojilova
|
Enumeration en = pathlist.keys();
|
274 |
|
|
while (en.hasMoreElements()) {
|
275 |
|
|
String path = (String)en.nextElement();
|
276 |
|
|
Long nodeid = (Long)pathlist.get(path);
|
277 |
|
|
pstmt.setLong(1, nodeid.longValue());
|
278 |
|
|
pstmt.setString(2, path);
|
279 |
|
|
pstmt.executeUpdate();
|
280 |
|
|
|
281 |
|
|
//System.out.println(nodeid + " ==> " + path);
|
282 |
|
|
}
|
283 |
|
|
|
284 |
|
|
// Close the database statement
|
285 |
|
|
pstmt.close();
|
286 |
|
|
} catch (SQLException sqe) {
|
287 |
675
|
berkley
|
System.err.println("SQL Exception while inserting path to index in " +
|
288 |
|
|
"DBSAXNode.updateNodeIndex");
|
289 |
471
|
bojilova
|
System.err.println(sqe.getMessage());
|
290 |
|
|
throw new SAXException(sqe.getMessage());
|
291 |
|
|
}
|
292 |
|
|
}
|
293 |
|
|
|
294 |
|
|
/**
|
295 |
|
|
* USED FROM SEPARATE THREAD RUNNED from DBSAXHandler on endDocument()
|
296 |
|
|
* Update the node index (xml_index) for this node by generating
|
297 |
|
|
* test strings that represent all of the relative and absolute
|
298 |
|
|
* paths through the XML tree from document root to this node
|
299 |
|
|
*/
|
300 |
|
|
public void updateNodeIndex(Connection conn, String docid, String doctype)
|
301 |
|
|
throws SAXException
|
302 |
|
|
{
|
303 |
|
|
Hashtable pathlist = new Hashtable();
|
304 |
|
|
boolean atStartingNode = true;
|
305 |
|
|
boolean atRootDocumentNode = false;
|
306 |
|
|
DBSAXNode nodePointer = this;
|
307 |
|
|
StringBuffer currentPath = new StringBuffer();
|
308 |
|
|
int counter = 0;
|
309 |
|
|
|
310 |
|
|
// Create a Hashtable of all of the paths to reach this node
|
311 |
|
|
// including absolute paths and relative paths
|
312 |
|
|
while (!atRootDocumentNode) {
|
313 |
|
|
if (atStartingNode) {
|
314 |
|
|
currentPath.insert(0, nodePointer.getTagName());
|
315 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
316 |
|
|
counter++;
|
317 |
|
|
atStartingNode = false;
|
318 |
|
|
} else {
|
319 |
|
|
currentPath.insert(0, "/");
|
320 |
|
|
currentPath.insert(0, nodePointer.getTagName());
|
321 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
322 |
|
|
counter++;
|
323 |
|
|
}
|
324 |
|
|
|
325 |
|
|
// advance to the next parent node
|
326 |
|
|
nodePointer = nodePointer.getParentNode();
|
327 |
|
|
|
328 |
|
|
// If we're at the DOCUMENT node (root of DOM tree), add
|
329 |
|
|
// the root "/" to make the absolute path
|
330 |
|
|
if (nodePointer.getNodeType().equals("DOCUMENT")) {
|
331 |
|
|
currentPath.insert(0, "/");
|
332 |
|
|
pathlist.put(currentPath.toString(), new Long(getNodeID()));
|
333 |
|
|
counter++;
|
334 |
|
|
atRootDocumentNode = true;
|
335 |
|
|
}
|
336 |
|
|
}
|
337 |
|
|
|
338 |
|
|
try {
|
339 |
|
|
// Create an insert statement to reuse for all of the path insertions
|
340 |
|
|
PreparedStatement pstmt = conn.prepareStatement(
|
341 |
|
|
"INSERT INTO xml_index (nodeid, path, docid, doctype, " +
|
342 |
|
|
"parentnodeid) " +
|
343 |
|
|
"VALUES (?, ?, ?, ?, ?)");
|
344 |
|
|
((OraclePreparedStatement)pstmt).setExecuteBatch(counter);
|
345 |
|
|
|
346 |
|
|
pstmt.setString(3, docid);
|
347 |
|
|
pstmt.setString(4, doctype);
|
348 |
|
|
pstmt.setLong(5, getParentID());
|
349 |
|
|
|
350 |
|
|
// Step through the hashtable and insert each of the path values
|
351 |
176
|
jones
|
Enumeration en = pathlist.keys();
|
352 |
|
|
while (en.hasMoreElements()) {
|
353 |
|
|
String path = (String)en.nextElement();
|
354 |
|
|
Long nodeid = (Long)pathlist.get(path);
|
355 |
|
|
pstmt.setLong(1, nodeid.longValue());
|
356 |
|
|
pstmt.setString(2, path);
|
357 |
457
|
bojilova
|
pstmt.executeUpdate();
|
358 |
176
|
jones
|
|
359 |
|
|
//System.out.println(nodeid + " ==> " + path);
|
360 |
|
|
}
|
361 |
|
|
|
362 |
|
|
// Close the database statement
|
363 |
|
|
pstmt.close();
|
364 |
|
|
} catch (SQLException sqe) {
|
365 |
675
|
berkley
|
System.err.println("SQL Exception while inserting path to index in " +
|
366 |
|
|
"DBSAXNode.updateNodeIndex");
|
367 |
176
|
jones
|
System.err.println(sqe.getMessage());
|
368 |
461
|
bojilova
|
throw new SAXException(sqe.getMessage());
|
369 |
176
|
jones
|
}
|
370 |
|
|
}
|
371 |
|
|
|
372 |
|
|
/** get the parent of this node */
|
373 |
|
|
public DBSAXNode getParentNode() {
|
374 |
|
|
return parentNode;
|
375 |
|
|
}
|
376 |
15
|
jones
|
}
|