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/**
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* '$RCSfile$'
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* Purpose: A Class that handles the SAX XML events as they
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* are generated from XML documents
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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, Jivka Bojilova
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* Release: @release@
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*
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* '$Author: berkley $'
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* '$Date: 2002-01-18 10:24:13 -0800 (Fri, 18 Jan 2002) $'
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* '$Revision: 899 $'
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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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*/
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package edu.ucsb.nceas.metacat;
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import java.sql.*;
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import java.io.StringReader;
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import java.util.Stack;
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import java.util.Vector;
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import java.util.Hashtable;
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import java.util.Enumeration;
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import java.util.EmptyStackException;
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import org.xml.sax.Attributes;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.ext.DeclHandler;
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import org.xml.sax.ext.LexicalHandler;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* A database aware Class implementing callback bethods for the SAX parser to
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* call when processing the XML stream and generating events
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*/
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public class DBSAXHandler extends DefaultHandler
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implements LexicalHandler, DeclHandler, Runnable {
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private boolean atFirstElement;
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private boolean processingDTD;
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private String docname = null;
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private String doctype;
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private String systemid;
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private boolean stackCreated = false;
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private Stack nodeStack;
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private Vector nodeIndex;
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private Connection conn = null;
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private DocumentImpl currentDocument;
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private DBSAXNode rootNode;
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private String action = null;
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private String docid = null;
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private String user = null;
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private String[] groups = null;
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private String pub = null;
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private Thread xmlIndex;
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private boolean endDocument = false;
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private int serverCode = 1;
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private Hashtable namespaces = new Hashtable();
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private static final int MAXDATACHARS = 4000;
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// DOCTITLE attr cleared from the db
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// private static final int MAXTITLELEN = 1000;
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/** Construct an instance of the handler class
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*
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* @param conn the JDBC connection to which information is written
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*/
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public DBSAXHandler(Connection conn) {
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this.conn = conn;
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this.atFirstElement = true;
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this.processingDTD = false;
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// Create the stack for keeping track of node context
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// if it doesn't already exist
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if (!stackCreated) {
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nodeStack = new Stack();
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nodeIndex = new Vector();
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stackCreated = true;
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}
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}
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/** Construct an instance of the handler class
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*
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* @param conn the JDBC connection to which information is written
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* @param action - "INSERT" or "UPDATE"
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* @param docid to be inserted or updated into JDBC connection
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* @param user the user connected to MetaCat servlet and owns the document
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* @param groups the groups to which user belongs
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* @param pub flag for public "read" access on document
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* @param serverCode the serverid from xml_replication on which this document
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* resides.
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*
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*/
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public DBSAXHandler(Connection conn, String action, String docid,
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String user, String[] groups, String pub, int serverCode)
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{
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this(conn);
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this.action = action;
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this.docid = docid;
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this.user = user;
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this.groups = groups;
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this.pub = pub;
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this.serverCode = serverCode;
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this.xmlIndex = new Thread(this);
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}
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/** SAX Handler that receives notification of beginning of the document */
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public void startDocument() throws SAXException {
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MetaCatUtil.debugMessage("start Document");
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// Create the document node representation as root
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rootNode = new DBSAXNode(conn, this.docid);
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// Add the node to the stack, so that any text data can be
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// added as it is encountered
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nodeStack.push(rootNode);
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}
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/** SAX Handler that receives notification of end of the document */
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public void endDocument() throws SAXException {
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MetaCatUtil.debugMessage("end Document");
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// Starting new thread for writing XML Index.
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// It calls the run method of the thread.
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try {
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xmlIndex.start();
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} catch (NullPointerException e) {
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xmlIndex = null;
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throw new
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SAXException("Problem with starting thread for writing XML Index. " +
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e.getMessage());
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}
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}
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/** SAX Handler that is called at the start of Namespace */
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public void startPrefixMapping(String prefix, String uri)
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throws SAXException
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{
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MetaCatUtil.debugMessage("NAMESPACE");
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namespaces.put(prefix, uri);
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}
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/** SAX Handler that is called at the start of each XML element */
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public void startElement(String uri, String localName,
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String qName, Attributes atts)
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throws SAXException {
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MetaCatUtil.debugMessage("Start ELEMENT " + qName);
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DBSAXNode parentNode = null;
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DBSAXNode currentNode = null;
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// Get a reference to the parent node for the id
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try {
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parentNode = (DBSAXNode)nodeStack.peek();
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} catch (EmptyStackException e) {
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parentNode = null;
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}
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// Document representation that points to the root document node
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if (atFirstElement) {
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atFirstElement = false;
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// If no DOCTYPE declaration: docname = root element name
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if (docname == null) {
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docname = localName;
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doctype = docname;
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MetaCatUtil.debugMessage("DOCNAME-a: " + docname);
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MetaCatUtil.debugMessage("DOCTYPE-a: " + doctype);
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} else if (doctype == null) {
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doctype = docname;
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MetaCatUtil.debugMessage("DOCTYPE-b: " + doctype);
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}
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rootNode.writeNodename(docname);
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try {
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// for validated XML Documents store a reference to XML DB Catalog
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String catalogid = null;
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if ( systemid != null ) {
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(
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"SELECT catalog_id FROM xml_catalog " +
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"WHERE entry_type = 'DTD' " +
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"AND public_id = '" + doctype + "'");
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boolean hasRow = rs.next();
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if ( hasRow ) {
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catalogid = rs.getString(1);
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}
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stmt.close();
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}
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currentDocument = new DocumentImpl(conn, rootNode.getNodeID(),
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docname, doctype, docid, action, user,
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this.pub, catalogid, this.serverCode);
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} catch (Exception ane) {
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throw (new SAXException("Error in DBSaxHandler.startElement " +
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action, ane));
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}
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}
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// Create the current node representation
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currentNode = new DBSAXNode(conn, qName, localName, parentNode,
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currentDocument.getRootNodeID(),docid,
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currentDocument.getDoctype());
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// Add all of the namespaces
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String prefix;
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String nsuri;
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Enumeration prefixes = namespaces.keys();
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while ( prefixes.hasMoreElements() ) {
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prefix = (String)prefixes.nextElement();
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nsuri = (String)namespaces.get(prefix);
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currentNode.setNamespace(prefix, nsuri, docid);
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}
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namespaces = null;
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namespaces = new Hashtable();
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// Add all of the attributes
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for (int i=0; i<atts.getLength(); i++) {
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currentNode.setAttribute(atts.getQName(i), atts.getValue(i), docid);
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}
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// Add the node to the stack, so that any text data can be
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// added as it is encountered
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nodeStack.push(currentNode);
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// Add the node to the vector used by thread for writing XML Index
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nodeIndex.addElement(currentNode);
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}
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/* The run method of xmlIndex thread. It writes XML Index for the document. */
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public void run () {
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DBSAXNode currNode = null;
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DBSAXNode prevNode = null;
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Connection dbconn = null;
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String doctype = currentDocument.getDoctype();
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int step = 0;
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int counter = 0;
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try {
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// Opening separate db connection for writing XML Index
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MetaCatUtil util = new MetaCatUtil();
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dbconn = util.openDBConnection();
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dbconn.setAutoCommit(false);
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//the following while loop construct checks to make sure that the docid
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//of the document that we are trying to index is already
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//in the xml_documents table. if this is not the case, the foreign
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//key relationship between xml_documents and xml_index is temporarily
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//broken causing multiple problems.
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boolean inxmldoc = false;
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while(!inxmldoc)
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{
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String xmlDocumentsCheck = "select distinct docid from xml_documents";
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PreparedStatement xmlDocCheck = dbconn.prepareStatement(xmlDocumentsCheck);
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xmlDocCheck.execute();
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ResultSet doccheckRS = xmlDocCheck.getResultSet();
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boolean tableHasRows = doccheckRS.next();
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Vector docids = new Vector();
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while(tableHasRows)
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{
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docids.add(doccheckRS.getString(1).trim());
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tableHasRows = doccheckRS.next();
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}
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for(int i=0; i<docids.size(); i++)
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{
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String d = ((String)docids.elementAt(i)).trim();
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if(docid.trim().equals(d))
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{
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inxmldoc = true;
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}
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}
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xmlDocCheck.close();
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}
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// Going through the elements of the document and writing its Index
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Enumeration nodes = nodeIndex.elements();
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while ( nodes.hasMoreElements() ) {
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currNode = (DBSAXNode)nodes.nextElement();
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currNode.updateNodeIndex(dbconn, docid, doctype);
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}
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dbconn.commit();
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//if this is a package file
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String packagedoctype = util.getOption("packagedoctype");
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Vector packagedoctypes = new Vector();
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packagedoctypes = MetaCatUtil.getOptionList(packagedoctype);
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if ( packagedoctypes.contains(doctype) )
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{
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// write the package info to xml_relation table
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RelationHandler rth = new RelationHandler(docid, dbconn);
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// from the relations get the access file id for that package
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String aclid = rth.getAccessFileID(docid);
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// if there are access file, write ACL for that package
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if ( aclid != null ) {
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runAccessControlList(dbconn, aclid);
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}
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}
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// if it is an access file
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else if ( MetaCatUtil.getOptionList(
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util.getOption("accessdoctype")).contains(doctype) )
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{
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// write ACL for the package
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runAccessControlList(dbconn, docid);
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}
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dbconn.close();
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} catch (Exception e) {
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try {
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dbconn.rollback();
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dbconn.close();
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} catch (SQLException sqle) {}
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System.out.println("Error in DBSAXHandler.run " + e.getMessage());
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e.printStackTrace();
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}
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}
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// It runs in xmlIndex thread. It writes ACL for a package.
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private void runAccessControlList (Connection conn, String aclid)
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throws Exception
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{
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// read the access file from xml_nodes
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// parse the access file and store the access info into xml_access
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AccessControlList aclobj =
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new AccessControlList(conn, aclid, //new StringReader(xml),
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user, groups, serverCode);
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conn.commit();
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}
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343
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344
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/** SAX Handler that is called for each XML text node */
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public void characters(char[] cbuf, int start, int len) throws SAXException {
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MetaCatUtil.debugMessage("CHARACTERS");
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DBSAXNode currentNode = (DBSAXNode)nodeStack.peek();
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String data = null;
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int leftover = len;
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int offset = start;
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boolean moredata = true;
|
353
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|
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// This loop deals with the case where there are more characters
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// than can fit in a single database text field (limit is
|
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// MAXDATACHARS). If the text to be inserted exceeds MAXDATACHARS,
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// write a series of nodes that are MAXDATACHARS long, and then the
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// final node contains the remainder
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while (moredata) {
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if (leftover > MAXDATACHARS) {
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data = new String(cbuf, offset, MAXDATACHARS);
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leftover -= MAXDATACHARS;
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offset += MAXDATACHARS;
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} else {
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data = new String(cbuf, offset, leftover);
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moredata = false;
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}
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368
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|
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// Write the content of the node to the database
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currentNode.writeChildNodeToDB("TEXT", null, data, docid);
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}
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372
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}
|
373
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|
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/**
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* SAX Handler that is called for each XML text node that is
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* Ignorable white space
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*/
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public void ignorableWhitespace(char[] cbuf, int start, int len)
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throws SAXException {
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380
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// When validation is turned "on", white spaces are reported here
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// When validation is turned "off" white spaces are not reported here,
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// but through characters() callback
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MetaCatUtil.debugMessage("IGNORABLEWHITESPACE");
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384
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//System.out.println("Whitespace:" + len + "x" + new String(cbuf, start, len) + "x");
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385
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386
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DBSAXNode currentNode = (DBSAXNode)nodeStack.peek();
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387
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String data = null;
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int leftover = len;
|
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int offset = start;
|
390
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boolean moredata = true;
|
391
|
|
392
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// This loop deals with the case where there are more characters
|
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// than can fit in a single database text field (limit is
|
394
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// MAXDATACHARS). If the text to be inserted exceeds MAXDATACHARS,
|
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// write a series of nodes that are MAXDATACHARS long, and then the
|
396
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// final node contains the remainder
|
397
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while (moredata) {
|
398
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if (leftover > MAXDATACHARS) {
|
399
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data = new String(cbuf, offset, MAXDATACHARS);
|
400
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leftover -= MAXDATACHARS;
|
401
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offset += MAXDATACHARS;
|
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} else {
|
403
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data = new String(cbuf, offset, leftover);
|
404
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moredata = false;
|
405
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}
|
406
|
|
407
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// Write the content of the node to the database
|
408
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currentNode.writeChildNodeToDB("TEXT", null, data, docid);
|
409
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}
|
410
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}
|
411
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|
412
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/**
|
413
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* SAX Handler called once for each processing instruction found:
|
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* node that PI may occur before or after the root element.
|
415
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*/
|
416
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public void processingInstruction(String target, String data)
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417
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throws SAXException {
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418
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MetaCatUtil.debugMessage("PI");
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DBSAXNode currentNode = (DBSAXNode)nodeStack.peek();
|
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currentNode.writeChildNodeToDB("PI", target, data, docid);
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}
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422
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423
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/** SAX Handler that is called at the end of each XML element */
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424
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public void endElement(String uri, String localName,
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425
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String qName) throws SAXException {
|
426
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MetaCatUtil.debugMessage("End ELEMENT " + qName);
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427
|
|
428
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// Get the node from the stack
|
429
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DBSAXNode currentNode = (DBSAXNode)nodeStack.pop();
|
430
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}
|
431
|
|
432
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//
|
433
|
// the next section implements the LexicalHandler interface
|
434
|
//
|
435
|
|
436
|
/** SAX Handler that receives notification of DOCTYPE. Sets the DTD */
|
437
|
public void startDTD(String name, String publicId, String systemId)
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438
|
throws SAXException {
|
439
|
docname = name;
|
440
|
doctype = publicId;
|
441
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systemid = systemId;
|
442
|
|
443
|
MetaCatUtil.debugMessage("Start DTD");
|
444
|
MetaCatUtil.debugMessage("DOCNAME: " + docname);
|
445
|
MetaCatUtil.debugMessage("DOCTYPE: " + doctype);
|
446
|
MetaCatUtil.debugMessage(" SYSID: " + systemid);
|
447
|
}
|
448
|
|
449
|
/**
|
450
|
* SAX Handler that receives notification of end of DTD
|
451
|
*/
|
452
|
public void endDTD() throws SAXException {
|
453
|
|
454
|
MetaCatUtil.debugMessage("end DTD");
|
455
|
}
|
456
|
|
457
|
/**
|
458
|
* SAX Handler that receives notification of comments in the DTD
|
459
|
*/
|
460
|
public void comment(char[] ch, int start, int length) throws SAXException {
|
461
|
MetaCatUtil.debugMessage("COMMENT");
|
462
|
if ( !processingDTD ) {
|
463
|
DBSAXNode currentNode = (DBSAXNode)nodeStack.peek();
|
464
|
currentNode.writeChildNodeToDB("COMMENT", null, new String(ch), docid);
|
465
|
}
|
466
|
}
|
467
|
|
468
|
/**
|
469
|
* SAX Handler that receives notification of the start of CDATA sections
|
470
|
*/
|
471
|
public void startCDATA() throws SAXException {
|
472
|
MetaCatUtil.debugMessage("start CDATA");
|
473
|
}
|
474
|
|
475
|
/**
|
476
|
* SAX Handler that receives notification of the end of CDATA sections
|
477
|
*/
|
478
|
public void endCDATA() throws SAXException {
|
479
|
MetaCatUtil.debugMessage("end CDATA");
|
480
|
}
|
481
|
|
482
|
/**
|
483
|
* SAX Handler that receives notification of the start of entities
|
484
|
*/
|
485
|
public void startEntity(String name) throws SAXException {
|
486
|
MetaCatUtil.debugMessage("start ENTITY: " + name);
|
487
|
//System.out.println("start ENTITY: " + name);
|
488
|
if (name.equals("[dtd]")) {
|
489
|
processingDTD = true;
|
490
|
}
|
491
|
}
|
492
|
|
493
|
/**
|
494
|
* SAX Handler that receives notification of the end of entities
|
495
|
*/
|
496
|
public void endEntity(String name) throws SAXException {
|
497
|
MetaCatUtil.debugMessage("end ENTITY: " + name);
|
498
|
//System.out.println("end ENTITY: " + name);
|
499
|
if (name.equals("[dtd]")) {
|
500
|
processingDTD = false;
|
501
|
}
|
502
|
}
|
503
|
|
504
|
/**
|
505
|
* SAX Handler that receives notification of element declarations
|
506
|
*/
|
507
|
public void elementDecl(String name, String model)
|
508
|
throws org.xml.sax.SAXException {
|
509
|
//System.out.println("ELEMENTDECL: " + name + " " + model);
|
510
|
MetaCatUtil.debugMessage("ELEMENTDECL: " + name + " " + model);
|
511
|
}
|
512
|
|
513
|
/**
|
514
|
* SAX Handler that receives notification of attribute declarations
|
515
|
*/
|
516
|
public void attributeDecl(String eName, String aName,
|
517
|
String type, String valueDefault, String value)
|
518
|
throws org.xml.sax.SAXException {
|
519
|
|
520
|
//System.out.println("ATTRIBUTEDECL: " + eName + " "
|
521
|
// + aName + " " + type + " " + valueDefault + " "
|
522
|
// + value);
|
523
|
MetaCatUtil.debugMessage("ATTRIBUTEDECL: " + eName + " "
|
524
|
+ aName + " " + type + " " + valueDefault + " "
|
525
|
+ value);
|
526
|
}
|
527
|
|
528
|
/**
|
529
|
* SAX Handler that receives notification of internal entity declarations
|
530
|
*/
|
531
|
public void internalEntityDecl(String name, String value)
|
532
|
throws org.xml.sax.SAXException {
|
533
|
//System.out.println("INTERNENTITYDECL: " + name + " " + value);
|
534
|
MetaCatUtil.debugMessage("INTERNENTITYDECL: " + name + " " + value);
|
535
|
}
|
536
|
|
537
|
/**
|
538
|
* SAX Handler that receives notification of external entity declarations
|
539
|
*/
|
540
|
public void externalEntityDecl(String name, String publicId,
|
541
|
String systemId)
|
542
|
throws org.xml.sax.SAXException {
|
543
|
//System.out.println("EXTERNENTITYDECL: " + name + " " + publicId
|
544
|
// + " " + systemId);
|
545
|
MetaCatUtil.debugMessage("EXTERNENTITYDECL: " + name + " " + publicId
|
546
|
+ " " + systemId);
|
547
|
// it processes other external entity, not the DTD;
|
548
|
// it doesn't signal for the DTD here
|
549
|
processingDTD = false;
|
550
|
}
|
551
|
|
552
|
//
|
553
|
// the next section implements the ErrorHandler interface
|
554
|
//
|
555
|
|
556
|
/**
|
557
|
* SAX Handler that receives notification of fatal parsing errors
|
558
|
*/
|
559
|
public void fatalError(SAXParseException exception) throws SAXException {
|
560
|
MetaCatUtil.debugMessage("FATALERROR");
|
561
|
throw (new SAXException("Fatal processing error.", exception));
|
562
|
}
|
563
|
|
564
|
/**
|
565
|
* SAX Handler that receives notification of recoverable parsing errors
|
566
|
*/
|
567
|
public void error(SAXParseException exception) throws SAXException {
|
568
|
MetaCatUtil.debugMessage("ERROR");
|
569
|
throw (new SAXException("Processing error.", exception));
|
570
|
}
|
571
|
|
572
|
/**
|
573
|
* SAX Handler that receives notification of warnings
|
574
|
*/
|
575
|
public void warning(SAXParseException exception) throws SAXException {
|
576
|
MetaCatUtil.debugMessage("WARNING");
|
577
|
throw (new SAXException("Warning.", exception));
|
578
|
}
|
579
|
|
580
|
//
|
581
|
// Helper, getter and setter methods
|
582
|
//
|
583
|
|
584
|
/**
|
585
|
* get the document name
|
586
|
*/
|
587
|
public String getDocname() {
|
588
|
return docname;
|
589
|
}
|
590
|
|
591
|
/**
|
592
|
* get the document processing state
|
593
|
*/
|
594
|
public boolean processingDTD() {
|
595
|
return processingDTD;
|
596
|
}
|
597
|
}
|