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/**
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* Name: MetaCatServlet.java
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* Purpose: A Class that implements a metadata catalog as a java Servlet
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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, Dan Higgins
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*
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* Version: '$Id: MetaCatServlet.java 167 2000-06-16 02:56:07Z jones $'
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.PrintWriter;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.BufferedReader;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.ResourceBundle;
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import java.util.PropertyResourceBundle;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.Connection;
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import java.sql.SQLException;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.ServletInputStream;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpUtils;
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import oracle.xml.parser.v2.XSLStylesheet;
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import oracle.xml.parser.v2.XSLException;
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import oracle.xml.parser.v2.XMLDocumentFragment;
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import oracle.xml.parser.v2.XSLProcessor;
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import oracle.xml.parser.v2.*;
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import java.io.File;
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import java.io.FileInputStream;
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/**
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* A metadata catalog server implemented as a Java Servlet
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*
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* <p>Valid parameters are:<br>
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* action=query -- query the values of all elements and attributes
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* and return a result set of nodes<br>
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* action=query -- search text values for document match<br>
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* doctype -- document type list returned by the query (publicID)
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* qformat=xml -- display resultset from query in XML<br>
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* qformat=html -- display resultset from query in HTML<br>
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* action=getdocument -- display an XML document in XML or HTML<br>
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* docid=34 -- display the document with the document ID number 34<br>
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* action=putdocument -- load an XML document into the database store<br>
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* doctext -- XML text ofthe document to load into the database<br>
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* query -- actual query text (to go with 'action=query')<br>
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* action=validate -- vallidate the xml contained in validatetext<br>
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* valtext -- XML text to be validated
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* action=getdatadoc -- retreive a stored datadocument
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* datadoc -- data document name (id)
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*/
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public class MetaCatServlet extends HttpServlet {
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private ServletConfig config = null;
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private ServletContext context = null;
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Connection conn = null;
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DBSimpleQuery queryobj = null;
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DBReader docreader = null;
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DBTransform dbt = null;
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String user = null;
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String password = null;
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String defaultDB = null;
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String resultStyleURL = null;
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String xmlcatalogfile = null;
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String defaultdatapath = null; // path to directory where data files
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// that can be downloaded will be stored
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String executescript = null; // script to get data file and put it
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// in defaultdocpath dir
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PropertyResourceBundle options = null;
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/**
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* Initialize the servlet by creating appropriate database connections
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*/
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public void init( ServletConfig config ) throws ServletException {
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try {
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super.init( config );
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this.config = config;
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this.context = config.getServletContext();
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System.out.println("Servlet Initialize");
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// Get the configuration file information
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options = (PropertyResourceBundle)
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PropertyResourceBundle.getBundle("edu.ucsb.nceas.metacat.metacat");
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user = (String)options.handleGetObject("user");
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password = (String)options.handleGetObject("password");
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defaultDB = (String)options.handleGetObject("defaultDB");
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resultStyleURL = (String)options.handleGetObject("resultStyleURL");
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xmlcatalogfile = (String)options.handleGetObject("xmlcatalogfile");
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defaultdatapath = (String)options.handleGetObject("defaultdatapath");
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executescript = (String)options.handleGetObject("executescript");
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try {
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// Open a connection to the database
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conn = MetaCatUtil.openDBConnection(
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"oracle.jdbc.driver.OracleDriver",
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defaultDB, user, password);
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queryobj = new DBSimpleQuery(conn);
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docreader = new DBReader(conn);
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dbt = new DBTransform(conn);
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} catch (Exception e) {
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System.err.println("Error opening database connection");
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}
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} catch ( ServletException ex ) {
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throw ex;
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}
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}
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/** Handle "GET" method requests from HTTP clients */
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public void doGet (HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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/** Handle "POST" method requests from HTTP clients */
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public void doPost( HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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/**
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* Control servlet response depending on the action parameter specified
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*/
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private void handleGetOrPost(HttpServletRequest request,
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HttpServletResponse response)
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throws ServletException, IOException {
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if (conn == null) {
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System.err.println("Connection to database lost. Reopening...");
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try {
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// Open a connection to the database
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conn = MetaCatUtil.openDBConnection(
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"oracle.jdbc.driver.OracleDriver",
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defaultDB, user, password);
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queryobj = new DBSimpleQuery(conn);
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docreader = new DBReader(conn);
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dbt = new DBTransform(conn);
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} catch (Exception e) {
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System.err.println("Error opening database connection");
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}
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}
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// Get a handle to the output stream back to the client
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PrintWriter out = response.getWriter();
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//response.setContentType("text/html");
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String name = null;
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String[] value = null;
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String[] docid = new String[3];
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Hashtable params = new Hashtable();
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Enumeration paramlist = request.getParameterNames();
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while (paramlist.hasMoreElements()) {
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name = (String)paramlist.nextElement();
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value = request.getParameterValues(name);
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// Decode the docid and mouse click information
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if (name.endsWith(".y")) {
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docid[0] = name.substring(0,name.length()-2);
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//out.println("docid => " + docid[0]);
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params.put("docid", docid);
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name = "ypos";
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}
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if (name.endsWith(".x")) {
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name = "xpos";
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}
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//out.println(name + " => " + value[0]);
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params.put(name,value);
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}
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// Determine what type of request the user made
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// if the action parameter is set, use it as a default
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// but if the ypos param is set, calculate the action needed
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String action = ((String[])params.get("action"))[0];
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long ypos = 0;
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try {
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ypos = (new Long(((String[])params.get("ypos"))[0]).longValue());
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//out.println("<P>YPOS IS " + ypos);
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if (ypos <= 13) {
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action = "getdocument";
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} else if (ypos > 13 && ypos <= 27) {
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action = "validate";
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} else if (ypos > 27) {
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action = "transform";
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} else {
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action = "";
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}
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} catch (Exception npe) {
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//out.println("<P>Caught exception looking for Y value.");
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}
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if (action.equals("query")) {
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handleQueryAction(out, params, response);
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} else if (action.equals("getdocument")) {
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try {
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handleGetDocumentAction(out, params, response);
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} catch (ClassNotFoundException e) {
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out.println(e.getMessage());
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} catch (SQLException se) {
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out.println(se.getMessage());
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}
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} else if (action.equals("putdocument")) {
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handlePutDocumentAction(out, params, response);
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} else if (action.equals("validate")) {
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handleValidateAction(out, params, response);
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} else if (action.equals("getdatadoc")) {
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handleGetDataDocumentAction(out, params, response);
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} else {
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out.println("Error: action not registered. Please report this error.");
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}
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// Close the stream to the client
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out.close();
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}
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/**
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* Handle the database query request and return a result set, possibly
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* transformed from XML into HTML
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*/
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private void handleQueryAction(PrintWriter out, Hashtable params,
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HttpServletResponse response) {
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// Run the query
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Hashtable doclist = null;
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String query = ((String[])params.get("query"))[0];
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String[] doctypeArr = (String[])params.get("doctype");
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String doctype = null;
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if (doctypeArr != null) {
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doctype = ((String[])params.get("doctype"))[0];
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}
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if (queryobj != null) {
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if (doctype != null) {
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doclist = queryobj.findDocuments(query,doctype);
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} else {
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doclist = queryobj.findDocuments(query);
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}
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} else {
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out.println("Query Object Init failed.");
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/*
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out.println(user);
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out.println(defaultDB);
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out.println(xmlcatalogfile);
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*/
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return;
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}
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// Create a buffer to hold the xml result
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StringBuffer resultset = new StringBuffer();
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// Print the resulting root nodes
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String docid;
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String document = null;
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resultset.append("<?xml version=\"1.0\"?>\n");
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//resultset.append("<!DOCTYPE resultset PUBLIC " +
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// "\"-//NCEAS//resultset//EN\" \"resultset.dtd\">\n");
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resultset.append("<resultset>\n");
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resultset.append(" <query>" + query + "</query>");
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Enumeration doclistkeys = doclist.keys();
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while (doclistkeys.hasMoreElements()) {
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docid = (String)doclistkeys.nextElement();
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document = (String)doclist.get(docid);
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resultset.append(" <document>" + document + "</document>");
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}
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resultset.append("</resultset>");
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285
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286
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String qformat = ((String[])params.get("qformat"))[0];
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if (qformat.equals("xml")) {
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// set content type and other response header fields first
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response.setContentType("text/xml");
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out.println(resultset.toString());
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} else if (qformat.equals("html")) {
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// set content type and other response header fields first
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response.setContentType("text/html");
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294
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//out.println("Converting to HTML...");
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XMLDocumentFragment htmldoc = null;
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296
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try {
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297
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XSLStylesheet style = new XSLStylesheet(new URL(resultStyleURL), null);
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298
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htmldoc = (new XSLProcessor()).processXSL(style,
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299
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(Reader)(new StringReader(resultset.toString())),null);
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htmldoc.print(out);
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301
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} catch (Exception e) {
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302
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out.println("Error transforming document:\n" + e.getMessage());
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303
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}
|
304
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}
|
305
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}
|
306
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|
307
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/**
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308
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* Handle the database getdocument request and return a XML document,
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309
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* possibly transformed from XML into HTML
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310
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*/
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311
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private void handleGetDocumentAction(PrintWriter out, Hashtable params,
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312
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HttpServletResponse response)
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313
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throws ClassNotFoundException, IOException, SQLException {
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314
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String docidstr = null;
|
315
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String docid = null;
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316
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String doc = null;
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try {
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318
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// Find the document id number
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319
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docidstr = ((String[])params.get("docid"))[0];
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//docid = (new Long(docidstr)).longValue();
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docid = docidstr;
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322
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323
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// Get the document indicated fromthe db
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324
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doc = docreader.readXMLDocument(docid);
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325
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} catch (NullPointerException npe) {
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326
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response.setContentType("text/html");
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327
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out.println("Error getting document ID: " + docidstr +" (" + docid + ")");
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328
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}
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329
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330
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// Return the document in XML or HTML format
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331
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String qformat = ((String[])params.get("qformat"))[0];
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332
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if (qformat.equals("xml")) {
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333
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// set content type and other response header fields first
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334
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response.setContentType("text/xml");
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335
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out.println(doc);
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336
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} else if (qformat.equals("html")) {
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337
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// set content type and other response header fields first
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338
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response.setContentType("text/html");
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339
|
|
340
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// Look up the document type
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341
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String sourcetype = docreader.getDoctypeInfo(docid).getDoctype();
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342
|
|
343
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// Transform the document to the new doctype
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344
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dbt.transformXMLDocument(doc, sourcetype, "-//W3C//HTML//EN", out);
|
345
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}
|
346
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}
|
347
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|
348
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/**
|
349
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* Handle the database putdocument request and write an XML document
|
350
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* to the database connection
|
351
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*/
|
352
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private void handlePutDocumentAction(PrintWriter out, Hashtable params,
|
353
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HttpServletResponse response) {
|
354
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|
355
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// Get the document indicated
|
356
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String[] doctext = (String[])params.get("doctext");
|
357
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StringReader xml = new StringReader(doctext[0]);
|
358
|
|
359
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// write the document to the database
|
360
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try {
|
361
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DBWriter dbw = new DBWriter(xml, conn);
|
362
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} catch (SQLException e1) {
|
363
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out.println("Error 1 loading document:<p>\n" + e1.getMessage());
|
364
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}catch (IOException e2) {
|
365
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out.println("Error 2 loading document:<p>\n" + e2.getMessage());
|
366
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}catch (ClassNotFoundException e3) {
|
367
|
out.println("Error 3 loading document:<p>\n" + e3.getMessage());
|
368
|
}
|
369
|
|
370
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// set content type and other response header fields first
|
371
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response.setContentType("text/xml");
|
372
|
|
373
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out.println(doctext[0]);
|
374
|
}
|
375
|
|
376
|
/**
|
377
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* Handle the validtion request and return the results
|
378
|
* to the requestor
|
379
|
*/
|
380
|
private void handleValidateAction(PrintWriter out, Hashtable params, HttpServletResponse response) {
|
381
|
|
382
|
// Get the document indicated
|
383
|
String valtext = null;
|
384
|
try {
|
385
|
valtext = ((String[])params.get("valtext"))[0];
|
386
|
} catch (Exception nullpe) {
|
387
|
|
388
|
String docidstr = null;
|
389
|
String docid = null;
|
390
|
try {
|
391
|
// Find the document id number
|
392
|
docidstr = ((String[])params.get("docid"))[0];
|
393
|
//docid = (new Long(docidstr)).longValue();
|
394
|
docid = docidstr;
|
395
|
|
396
|
// Get the document indicated fromthe db
|
397
|
valtext = docreader.readXMLDocument(docid);
|
398
|
} catch (NullPointerException npe) {
|
399
|
response.setContentType("text/html");
|
400
|
out.println("Error getting document ID: " +
|
401
|
docidstr +" (" + docid + ")");
|
402
|
}
|
403
|
}
|
404
|
|
405
|
SAXParser parser = new SAXParser(); // works for both Xerces and Oracle
|
406
|
parser.setValidationMode(true); // Oracle
|
407
|
try {
|
408
|
GenericXMLValidate gxv = new GenericXMLValidate(parser, xmlcatalogfile);
|
409
|
boolean valid = gxv.validateString(valtext);
|
410
|
|
411
|
// set content type and other response header fields first
|
412
|
response.setContentType("text/html");
|
413
|
out.println("<html>");
|
414
|
out.println("<head><link rel=\"stylesheet\" type=\"text/css\" " +
|
415
|
"href=\"/xmltodb/rowcol.css\" /></head>");
|
416
|
out.println("<body class=\"emlbody\">");
|
417
|
|
418
|
if (valid) {
|
419
|
out.println("The input XML is VALID!");
|
420
|
} else {
|
421
|
out.println("The input XML is NOT VALID<br />\n<pre>\n"
|
422
|
+ gxv.returnErrors() + "\n</pre>\n");
|
423
|
//response.setContentType("text/xml");
|
424
|
//out.println(valtext);
|
425
|
}
|
426
|
out.println("</body></html>");
|
427
|
} catch (NullPointerException npe2) {
|
428
|
// set content type and other response header fields first
|
429
|
response.setContentType("text/html");
|
430
|
//out.println(valtext);
|
431
|
out.println("Error validating document.");
|
432
|
}
|
433
|
}
|
434
|
|
435
|
/**
|
436
|
* Look up the document type from the database
|
437
|
*
|
438
|
* @param docid the id of the document to look up
|
439
|
*/
|
440
|
private String OldgetDoctype(long docid) {
|
441
|
PreparedStatement pstmt;
|
442
|
String doctype = null;
|
443
|
|
444
|
try {
|
445
|
pstmt =
|
446
|
conn.prepareStatement("SELECT doctype " +
|
447
|
"FROM xml_documents " +
|
448
|
"WHERE docid = ?");
|
449
|
// Bind the values to the query
|
450
|
pstmt.setLong(1, new Long(docid).longValue());
|
451
|
|
452
|
pstmt.execute();
|
453
|
try {
|
454
|
ResultSet rs = pstmt.getResultSet();
|
455
|
try {
|
456
|
boolean tableHasRows = rs.next();
|
457
|
if (tableHasRows) {
|
458
|
try {
|
459
|
doctype = rs.getString(1);
|
460
|
} catch (SQLException e) {
|
461
|
System.out.println("Error with getString: " + e.getMessage());
|
462
|
}
|
463
|
}
|
464
|
} catch (SQLException e) {
|
465
|
System.out.println("Error with next: " + e.getMessage());
|
466
|
}
|
467
|
} catch (SQLException e) {
|
468
|
System.out.println("Error with getrset: " + e.getMessage());
|
469
|
}
|
470
|
pstmt.close();
|
471
|
} catch (SQLException e) {
|
472
|
System.out.println("Error getting id: " + e.getMessage());
|
473
|
}
|
474
|
|
475
|
return doctype;
|
476
|
}
|
477
|
|
478
|
|
479
|
/**
|
480
|
* Handle the document request and return the results
|
481
|
* to the requestor
|
482
|
*/
|
483
|
private void handleGetDataDocumentAction(PrintWriter out, Hashtable params, HttpServletResponse response) {
|
484
|
boolean error_flag = false;
|
485
|
String error_message = "";
|
486
|
// Get the document indicated
|
487
|
String[] datadoc = (String[])params.get("datadoc");
|
488
|
// defaultdatapath = "C:\\Temp\\"; // for testing only!!!
|
489
|
// executescript = "test.bat"; // for testing only!!!
|
490
|
|
491
|
// set content type and other response header fields first
|
492
|
response.setContentType("application/octet-stream");
|
493
|
if (defaultdatapath!=null) {
|
494
|
if(!defaultdatapath.endsWith(System.getProperty("file.separator"))) defaultdatapath=defaultdatapath+System.getProperty("file.separator");
|
495
|
System.out.println("Path= "+defaultdatapath+datadoc[0]);
|
496
|
if (executescript!=null) {
|
497
|
String command = null;
|
498
|
File scriptfile = new File(executescript);
|
499
|
if (scriptfile.exists()) {
|
500
|
command=executescript+" "+datadoc[0]; } // execute script includes path
|
501
|
else { // look in defaultdatapath
|
502
|
command = defaultdatapath+executescript+" "+datadoc[0]; // on Win98 one MUST include the .bat extender
|
503
|
}
|
504
|
System.out.println(command);
|
505
|
try {
|
506
|
Process proc = Runtime.getRuntime().exec(command);
|
507
|
proc.waitFor();
|
508
|
}
|
509
|
catch (Exception eee) {
|
510
|
System.out.println("Error running process!");
|
511
|
error_flag = true;
|
512
|
error_message = "Error running process!";}
|
513
|
} // end executescript not null if
|
514
|
File datafile = new File(defaultdatapath+datadoc[0]);
|
515
|
try {
|
516
|
FileInputStream fw = new FileInputStream(datafile);
|
517
|
int x;
|
518
|
while ((x = fw.read())!=-1) {
|
519
|
out.write(x); }
|
520
|
fw.close();
|
521
|
|
522
|
}
|
523
|
catch (Exception e) {
|
524
|
System.out.println("Error in returning file\n"+e.getMessage());
|
525
|
error_flag=true;
|
526
|
error_message = error_message+"\nError in returning file\n"+e.getMessage();}
|
527
|
} // end defaultdatapath not null if
|
528
|
}
|
529
|
|
530
|
|
531
|
}
|