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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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91
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higgins
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* Authors: Matt Jones, Dan Higgins
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51
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jones
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*
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* Version: '$Id$'
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*/
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package edu.ucsb.nceas.metacat;
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46
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jones
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import java.io.PrintWriter;
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import java.io.IOException;
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50
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jones
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import java.io.Reader;
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import java.io.StringReader;
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59
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jones
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import java.io.BufferedReader;
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46
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jones
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import java.util.Enumeration;
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import java.util.Hashtable;
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82
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jones
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import java.util.ResourceBundle;
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import java.util.PropertyResourceBundle;
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jones
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import java.net.URL;
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import java.net.MalformedURLException;
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85
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jones
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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jones
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import java.sql.Connection;
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jones
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import java.sql.SQLException;
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jones
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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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jones
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import javax.servlet.ServletInputStream;
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jones
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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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jones
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import javax.servlet.http.HttpUtils;
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46
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jones
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jones
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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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68
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higgins
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import oracle.xml.parser.v2.*; //Oracle parser - DFH
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91
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higgins
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import java.io.File; //DFH
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import java.io.FileInputStream; //DFH
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50
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jones
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jones
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/**
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* A metadata catalog server implemented as a Java Servlet
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jones
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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=getdocument -- display an XML document in XML or HTML<br>
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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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jones
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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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68
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higgins
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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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91
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higgins
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* action=getdatadoc -- retreive a stored datadocument //DFH
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* datadoc -- data document name (id) //DFH
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jones
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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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jones
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Connection conn = null;
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jones
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DBSimpleQuery queryobj = null;
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jones
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DBReader docreader = null;
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jones
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DBTransform dbt = null;
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jones
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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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jones
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String xmlcatalogfile = null;
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higgins
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String defaultdatapath = null; // path to directory where data files that can be downloaded will be stored
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String executescript = null; // script to get data file and put it in defaultdocpath dir
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jones
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PropertyResourceBundle options = null;
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jones
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jones
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/**
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* Initialize the servlet by creating appropriate database connections
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*/
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jones
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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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jones
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System.out.println("Servlet Initialize");
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jones
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// Get the configuration file information
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jones
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options = (PropertyResourceBundle)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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jones
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xmlcatalogfile = (String)options.handleGetObject("xmlcatalogfile");
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91
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higgins
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defaultdatapath = (String)options.handleGetObject("defaultdatapath");
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executescript = (String)options.handleGetObject("executescript");
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82
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jones
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46
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jones
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try {
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50
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jones
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// Open a connection to the database
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55
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jones
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conn = MetaCatUtil.openDBConnection(
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50
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jones
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"oracle.jdbc.driver.OracleDriver",
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defaultDB, user, password);
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55
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jones
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queryobj = new DBSimpleQuery(conn);
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docreader = new DBReader(conn);
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87
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jones
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dbt = new DBTransform(conn);
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68
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higgins
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46
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jones
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} catch (Exception e) {
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100
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jones
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System.err.println("Error opening database connection");
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46
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jones
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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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50
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jones
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/** Handle "GET" method requests from HTTP clients */
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46
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jones
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public void doGet (HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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48
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jones
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// Process the data and send back the response
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59
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jones
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handleGetOrPost(request, response);
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48
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jones
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}
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50
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jones
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/** Handle "POST" method requests from HTTP clients */
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48
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jones
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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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59
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jones
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handleGetOrPost(request, response);
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48
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jones
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}
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49
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jones
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/**
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50
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jones
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* Control servlet response depending on the action parameter specified
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49
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jones
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*/
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59
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jones
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private void handleGetOrPost(HttpServletRequest request,
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140 |
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HttpServletResponse response)
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48
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jones
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throws ServletException, IOException {
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142 |
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100
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jones
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if (conn == null) {
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System.err.println("Connection to database lost. Reopening...");
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145 |
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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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155 |
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} catch (Exception e) {
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156 |
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System.err.println("Error opening database connection");
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}
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}
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159 |
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160 |
49
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jones
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// Get a handle to the output stream back to the client
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48
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jones
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PrintWriter out = response.getWriter();
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162 |
49
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jones
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163 |
59
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jones
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String name = null;
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String[] value = null;
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165 |
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Hashtable params = new Hashtable();
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166 |
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Enumeration paramlist = request.getParameterNames();
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167 |
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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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params.put(name,value);
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}
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172 |
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173 |
49
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jones
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String action = ((String[])params.get("action"))[0];
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174 |
46
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jones
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175 |
49
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jones
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if (action.equals("query")) {
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176 |
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handleQueryAction(out, params, response);
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} else if (action.equals("getdocument")) {
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178 |
87
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jones
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try {
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179 |
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handleGetDocumentAction(out, params, response);
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180 |
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} catch (ClassNotFoundException e) {
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181 |
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System.out.println(e.getMessage());
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182 |
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} catch (SQLException se) {
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183 |
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System.out.println(se.getMessage());
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184 |
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}
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185 |
55
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jones
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} else if (action.equals("putdocument")) {
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186 |
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handlePutDocumentAction(out, params, response);
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187 |
68
|
higgins
|
} else if (action.equals("validate")) {
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188 |
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handleValidateAction(out, params, response);
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189 |
91
|
higgins
|
} else if (action.equals("getdatadoc")) {
|
190 |
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handleGetDataDocumentAction(out, params, response);
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191 |
50
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jones
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} else {
|
192 |
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out.println("Error: action not registered. Please report this error.");
|
193 |
46
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jones
|
}
|
194 |
|
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|
195 |
49
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jones
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// Close the stream to the client
|
196 |
46
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jones
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out.close();
|
197 |
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}
|
198 |
49
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jones
|
|
199 |
50
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jones
|
/**
|
200 |
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* Handle the database query request and return a result set, possibly
|
201 |
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* transformed from XML into HTML
|
202 |
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*/
|
203 |
49
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jones
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private void handleQueryAction(PrintWriter out, Hashtable params,
|
204 |
|
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HttpServletResponse response) {
|
205 |
|
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// Run the query
|
206 |
82
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jones
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Hashtable nodelist = null;
|
207 |
49
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jones
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String query = ((String[])params.get("query"))[0];
|
208 |
82
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jones
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if (queryobj != null) {
|
209 |
86
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jones
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nodelist = queryobj.findDocuments(query);
|
210 |
82
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jones
|
} else {
|
211 |
|
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out.println("Query Object Init failed.");
|
212 |
83
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jones
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/*
|
213 |
82
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jones
|
out.println(user);
|
214 |
|
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out.println(defaultDB);
|
215 |
83
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jones
|
out.println(xmlcatalogfile);
|
216 |
|
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*/
|
217 |
|
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return;
|
218 |
82
|
jones
|
}
|
219 |
50
|
jones
|
|
220 |
|
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// Create a buffer to hold the xml result
|
221 |
|
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StringBuffer resultset = new StringBuffer();
|
222 |
|
|
|
223 |
49
|
jones
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// Print the resulting root nodes
|
224 |
98
|
jones
|
Long nodeid;
|
225 |
|
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String document = null;
|
226 |
50
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jones
|
resultset.append("<?xml version=\"1.0\"?>\n");
|
227 |
87
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jones
|
//resultset.append("<!DOCTYPE resultset PUBLIC " +
|
228 |
|
|
// "\"-//NCEAS//resultset//EN\" \"resultset.dtd\">\n");
|
229 |
50
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jones
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resultset.append("<resultset>\n");
|
230 |
|
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resultset.append(" <query>" + query + "</query>");
|
231 |
49
|
jones
|
Enumeration rootlist = nodelist.keys();
|
232 |
|
|
while (rootlist.hasMoreElements()) {
|
233 |
98
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jones
|
nodeid = (Long)rootlist.nextElement();
|
234 |
|
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document = (String)nodelist.get(nodeid);
|
235 |
|
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resultset.append(" <document>" + document + "</document>");
|
236 |
49
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jones
|
}
|
237 |
50
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jones
|
resultset.append("</resultset>");
|
238 |
|
|
|
239 |
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String qformat = ((String[])params.get("qformat"))[0];
|
240 |
|
|
if (qformat.equals("xml")) {
|
241 |
|
|
// set content type and other response header fields first
|
242 |
|
|
response.setContentType("text/xml");
|
243 |
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out.println(resultset.toString());
|
244 |
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} else if (qformat.equals("html")) {
|
245 |
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// set content type and other response header fields first
|
246 |
|
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response.setContentType("text/html");
|
247 |
|
|
//out.println("Converting to HTML...");
|
248 |
|
|
XMLDocumentFragment htmldoc = null;
|
249 |
|
|
try {
|
250 |
|
|
XSLStylesheet style = new XSLStylesheet(new URL(resultStyleURL), null);
|
251 |
|
|
htmldoc = (new XSLProcessor()).processXSL(style,
|
252 |
|
|
(Reader)(new StringReader(resultset.toString())),null);
|
253 |
|
|
htmldoc.print(out);
|
254 |
|
|
} catch (Exception e) {
|
255 |
|
|
out.println("Error transforming document:\n" + e.getMessage());
|
256 |
|
|
}
|
257 |
|
|
}
|
258 |
49
|
jones
|
}
|
259 |
|
|
|
260 |
50
|
jones
|
/**
|
261 |
|
|
* Handle the database getdocument request and return a XML document,
|
262 |
|
|
* possibly transformed from XML into HTML
|
263 |
|
|
*/
|
264 |
49
|
jones
|
private void handleGetDocumentAction(PrintWriter out, Hashtable params,
|
265 |
87
|
jones
|
HttpServletResponse response)
|
266 |
|
|
throws ClassNotFoundException, IOException, SQLException {
|
267 |
|
|
// Find the document id number
|
268 |
|
|
String docidstr = ((String[])params.get("docid"))[0];
|
269 |
|
|
long docid = (new Long(docidstr)).longValue();
|
270 |
49
|
jones
|
|
271 |
87
|
jones
|
// Get the document indicated fromthe db
|
272 |
|
|
String doc = docreader.readXMLDocument(docid);
|
273 |
85
|
jones
|
|
274 |
87
|
jones
|
|
275 |
|
|
// Return the document in XML or HTML format
|
276 |
85
|
jones
|
String qformat = ((String[])params.get("qformat"))[0];
|
277 |
|
|
if (qformat.equals("xml")) {
|
278 |
|
|
// set content type and other response header fields first
|
279 |
|
|
response.setContentType("text/xml");
|
280 |
|
|
out.println(doc);
|
281 |
|
|
} else if (qformat.equals("html")) {
|
282 |
|
|
// set content type and other response header fields first
|
283 |
|
|
response.setContentType("text/html");
|
284 |
|
|
|
285 |
87
|
jones
|
// Look up the document type
|
286 |
|
|
String sourcetype = getDoctype(docid);
|
287 |
86
|
jones
|
|
288 |
87
|
jones
|
// Transform the document to the new doctype
|
289 |
|
|
dbt.transformXMLDocument(doc, sourcetype, "-//W3C//HTML//EN", out);
|
290 |
85
|
jones
|
}
|
291 |
49
|
jones
|
}
|
292 |
55
|
jones
|
|
293 |
|
|
/**
|
294 |
|
|
* Handle the database putdocument request and write an XML document
|
295 |
|
|
* to the database connection
|
296 |
|
|
*/
|
297 |
|
|
private void handlePutDocumentAction(PrintWriter out, Hashtable params,
|
298 |
|
|
HttpServletResponse response) {
|
299 |
59
|
jones
|
|
300 |
55
|
jones
|
// Get the document indicated
|
301 |
59
|
jones
|
String[] doctext = (String[])params.get("doctext");
|
302 |
|
|
StringReader xml = new StringReader(doctext[0]);
|
303 |
|
|
|
304 |
|
|
// write the document to the database
|
305 |
55
|
jones
|
try {
|
306 |
59
|
jones
|
DBSAXWriter dbw = new DBSAXWriter(xml, conn);
|
307 |
55
|
jones
|
} catch (SQLException e1) {
|
308 |
59
|
jones
|
out.println("Error 1 loading document:<p>\n" + e1.getMessage());
|
309 |
55
|
jones
|
}catch (IOException e2) {
|
310 |
59
|
jones
|
out.println("Error 2 loading document:<p>\n" + e2.getMessage());
|
311 |
55
|
jones
|
}catch (ClassNotFoundException e3) {
|
312 |
59
|
jones
|
out.println("Error 3 loading document:<p>\n" + e3.getMessage());
|
313 |
55
|
jones
|
}
|
314 |
|
|
|
315 |
|
|
// set content type and other response header fields first
|
316 |
59
|
jones
|
response.setContentType("text/xml");
|
317 |
55
|
jones
|
|
318 |
59
|
jones
|
out.println(doctext[0]);
|
319 |
55
|
jones
|
}
|
320 |
68
|
higgins
|
|
321 |
|
|
/**
|
322 |
|
|
* Handle the validtion request and return the results
|
323 |
|
|
* to the requestor - DFH
|
324 |
|
|
*/
|
325 |
|
|
private void handleValidateAction(PrintWriter out, Hashtable params, HttpServletResponse response) {
|
326 |
|
|
|
327 |
|
|
// Get the document indicated
|
328 |
|
|
String[] valtext = (String[])params.get("valtext");
|
329 |
|
|
|
330 |
|
|
|
331 |
|
|
SAXParser parser = new SAXParser(); // works for both Xerces and Oracle
|
332 |
|
|
parser.setValidationMode(true); // Oracle
|
333 |
83
|
jones
|
GenericXMLValidate gxv = new GenericXMLValidate(parser, xmlcatalogfile);
|
334 |
68
|
higgins
|
boolean valid = gxv.validateString(valtext[0]);
|
335 |
|
|
|
336 |
|
|
// set content type and other response header fields first
|
337 |
|
|
response.setContentType("text/plain");
|
338 |
|
|
|
339 |
|
|
if (valid) {
|
340 |
|
|
out.println("The input XML is VALID!");
|
341 |
|
|
}
|
342 |
|
|
else {
|
343 |
|
|
out.println("The input XML is NOT VALID\n" + gxv.returnErrors());
|
344 |
|
|
}
|
345 |
|
|
}
|
346 |
87
|
jones
|
|
347 |
|
|
/**
|
348 |
|
|
* Look up the document type from the database
|
349 |
|
|
*
|
350 |
|
|
*/
|
351 |
|
|
private String getDoctype(long docid) {
|
352 |
|
|
// Look up the System ID of the XSL sheet
|
353 |
|
|
PreparedStatement pstmt;
|
354 |
|
|
String doctype = null;
|
355 |
|
|
|
356 |
|
|
try {
|
357 |
|
|
pstmt =
|
358 |
|
|
conn.prepareStatement("SELECT doctype " +
|
359 |
|
|
"FROM xml_documents " +
|
360 |
|
|
"WHERE docid = ?");
|
361 |
|
|
// Bind the values to the query
|
362 |
|
|
pstmt.setLong(1, new Long(docid).longValue());
|
363 |
|
|
|
364 |
|
|
pstmt.execute();
|
365 |
|
|
try {
|
366 |
|
|
ResultSet rs = pstmt.getResultSet();
|
367 |
|
|
try {
|
368 |
|
|
boolean tableHasRows = rs.next();
|
369 |
|
|
if (tableHasRows) {
|
370 |
|
|
try {
|
371 |
|
|
doctype = rs.getString(1);
|
372 |
|
|
} catch (SQLException e) {
|
373 |
|
|
System.out.println("Error with getString: " + e.getMessage());
|
374 |
|
|
}
|
375 |
|
|
}
|
376 |
|
|
} catch (SQLException e) {
|
377 |
|
|
System.out.println("Error with next: " + e.getMessage());
|
378 |
|
|
}
|
379 |
|
|
} catch (SQLException e) {
|
380 |
|
|
System.out.println("Error with getrset: " + e.getMessage());
|
381 |
|
|
}
|
382 |
|
|
pstmt.close();
|
383 |
|
|
} catch (SQLException e) {
|
384 |
|
|
System.out.println("Error getting id: " + e.getMessage());
|
385 |
|
|
}
|
386 |
|
|
|
387 |
|
|
return doctype;
|
388 |
|
|
}
|
389 |
91
|
higgins
|
|
390 |
|
|
|
391 |
|
|
/**
|
392 |
|
|
* Handle the document request and return the results
|
393 |
|
|
* to the requestor - DFH
|
394 |
|
|
*/
|
395 |
|
|
private void handleGetDataDocumentAction(PrintWriter out, Hashtable params, HttpServletResponse response) {
|
396 |
|
|
boolean error_flag = false;
|
397 |
|
|
String error_message = "";
|
398 |
|
|
// Get the document indicated
|
399 |
|
|
String[] datadoc = (String[])params.get("datadoc");
|
400 |
|
|
// defaultdatapath = "C:\\Temp\\"; // for testing only!!!
|
401 |
|
|
// executescript = "test.bat"; // for testing only!!!
|
402 |
|
|
|
403 |
|
|
// set content type and other response header fields first
|
404 |
|
|
response.setContentType("application/octet-stream");
|
405 |
|
|
if (defaultdatapath!=null) {
|
406 |
|
|
if(!defaultdatapath.endsWith(System.getProperty("file.separator"))) defaultdatapath=defaultdatapath+System.getProperty("file.separator");
|
407 |
|
|
System.out.println("Path= "+defaultdatapath+datadoc[0]);
|
408 |
|
|
if (executescript!=null) {
|
409 |
|
|
String command = null;
|
410 |
|
|
File scriptfile = new File(executescript);
|
411 |
|
|
if (scriptfile.exists()) {
|
412 |
|
|
command=executescript+" "+datadoc[0]; } // execute script includes path
|
413 |
|
|
else { // look in defaultdatapath
|
414 |
|
|
command = defaultdatapath+executescript+" "+datadoc[0]; // on Win98 one MUST include the .bat extender
|
415 |
|
|
}
|
416 |
|
|
System.out.println(command);
|
417 |
|
|
try {
|
418 |
|
|
Process proc = Runtime.getRuntime().exec(command);
|
419 |
|
|
proc.waitFor();
|
420 |
|
|
}
|
421 |
|
|
catch (Exception eee) {
|
422 |
|
|
System.out.println("Error running process!");
|
423 |
|
|
error_flag = true;
|
424 |
|
|
error_message = "Error running process!";}
|
425 |
|
|
} // end executescript not null if
|
426 |
|
|
File datafile = new File(defaultdatapath+datadoc[0]);
|
427 |
|
|
try {
|
428 |
|
|
FileInputStream fw = new FileInputStream(datafile);
|
429 |
|
|
int x;
|
430 |
|
|
while ((x = fw.read())!=-1) {
|
431 |
|
|
out.write(x); }
|
432 |
|
|
fw.close();
|
433 |
|
|
|
434 |
|
|
}
|
435 |
|
|
catch (Exception e) {
|
436 |
|
|
System.out.println("Error in returning file\n"+e.getMessage());
|
437 |
|
|
error_flag=true;
|
438 |
|
|
error_message = error_message+"\nError in returning file\n"+e.getMessage();}
|
439 |
|
|
} // end defaultdatapath not null if
|
440 |
|
|
}
|
441 |
|
|
|
442 |
|
|
|
443 |
46
|
jones
|
}
|