Revision 699
Added by bojilova about 23 years ago
| DBUtil.java | ||
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* '$RCSfile$' |
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* Purpose: A Class that implements utility methods like: |
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* 1/ Reding all doctypes from db connection |
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* 2/ Reading Lore type Data Guide from db connection |
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* 2/ Reading DTD or Schema file from Metacat catalog system |
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* 3/ Reading Lore type Data Guide from db connection |
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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: Jivka Bojilova |
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import java.sql.SQLException; |
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import java.sql.PreparedStatement; |
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import java.sql.ResultSet; |
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import java.io.BufferedInputStream; |
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import java.io.InputStream; |
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import java.io.IOException; |
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import java.net.URL; |
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import java.net.URLConnection; |
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import java.net.MalformedURLException; |
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import java.util.Enumeration; |
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import java.util.Vector; |
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import java.util.Stack; |
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if (args.length < 1) |
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{
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
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System.err.println( |
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"USAGE: java DBUtil <-dt | -ds [doctype] | -dg [doctype]>"); |
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return; |
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} else {
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try {
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if ( args.length == 2 ) { doctype = args[1]; }
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String dataguide = dbutil.readDataGuide(doctype); |
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System.out.println(dataguide); |
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} else if ( args[0].equals("-ds") ) {
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String doctype = null; |
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if ( args.length == 2 ) { doctype = args[1]; }
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String dtdschema = dbutil.readDTDSchema(doctype); |
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System.out.println(dtdschema); |
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} else {
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System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
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System.err.println( |
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"USAGE: java DBUtil <-dt | -ds [doctype] | -dg [doctype]>"); |
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} |
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} catch (Exception e) {
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System.err.println("error in DBUtil.main");
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System.err.println(e.getMessage()); |
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//System.err.println("error in DBUtil.main");
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//System.err.println(e.getMessage());
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e.printStackTrace(System.err); |
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} |
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} |
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pstmt.close(); |
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} catch (SQLException e) {
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System.out.println("DBUtil.readDoctypes(): " + e.getMessage());
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throw e; |
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throw new SQLException("DBUtil.readDoctypes(). " + e.getMessage());
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} |
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return formatToXML(doctypeList, "doctype"); |
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} |
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/** |
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* read DTD or Schema file from Metacat's XML catalog system |
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*/ |
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public String readDTDSchema(String doctype) |
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throws SQLException, MalformedURLException, IOException |
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{
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String systemID = null; |
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PreparedStatement pstmt; |
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StringBuffer cbuff = new StringBuffer(); |
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// get doctype's System ID from db catalog |
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try {
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pstmt = conn.prepareStatement("SELECT system_id " +
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"FROM xml_catalog " + |
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"WHERE entry_type in ('DTD','Schema') " +
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"AND public_id LIKE ?"); |
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pstmt.setString(1, doctype); |
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pstmt.execute(); |
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ResultSet rs = pstmt.getResultSet(); |
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boolean hasRow = rs.next(); |
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if (hasRow) {
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systemID = rs.getString(1); |
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} else {
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throw new SQLException("Non-registered doctype: " + doctype);
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} |
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pstmt.close(); |
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} catch (SQLException e) {
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throw new SQLException("DBUtil.readDTD(). " + e.getMessage());
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} |
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// read from URL stream as specified by the System ID. |
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try {
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// open a connection to this URL and return an InputStream |
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// for reading from that connection |
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InputStream istream = new URL(systemID).openStream(); |
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// create a buffering character-input stream |
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// that uses a default-sized input buffer |
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BufferedInputStream in = new BufferedInputStream(istream); |
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// read the input and write into the string buffer |
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int inputByte; |
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while ( (inputByte = in.read()) != -1 ) {
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cbuff.append((char)inputByte); |
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} |
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// the input stream must be closed |
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in.close(); |
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} catch (MalformedURLException e) {
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throw new MalformedURLException |
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("DBUtil.readDTD(). " + e.getMessage());
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} catch (IOException e) {
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throw new IOException |
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("DBUtil.readDTD(). " + e.getMessage());
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} catch (SecurityException e) {
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throw new IOException |
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("DBUtil.readDTD(). " + e.getMessage());
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} |
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return cbuff.toString(); |
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} |
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/** |
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* read Data Guide for a given doctype from db connection in XML format |
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* select all distinct absolute paths from xml_index table |
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*/ |
| ... | ... | |
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pstmt.close(); |
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} catch (SQLException e) {
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System.out.println("DBUtil.readDataGuide(): " + e.getMessage());
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throw e; |
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throw new SQLException("DBUtil.readDataGuide(). " + e.getMessage());
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} |
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return formatToXML(dataguide); |
Also available in: Unified diff
implemented interface for download of DTD or Schema file from Metacat file system
through the params:
action="getdtdschema"
doctype