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jones
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/**
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* Name: QuerySpecification.java
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* Purpose: A Class that represents a structured query, and can be
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* constructed from an XML serialization
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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*
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* Version: '$Id$'
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.util.Stack;
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import java.util.Hashtable;
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import java.util.Enumeration;
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import org.xml.sax.*;
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import oracle.xml.parser.v2.SAXParser;
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/**
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* A Class that represents a structuredd query,and can be constructed from an
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* XML serialization
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*/
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public class QuerySpecification extends HandlerBase {
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query as a Reader
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*/
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public QuerySpecification( Reader queryspec ) throws IOException {
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super();
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/*
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int bytesread = 0;
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while (bytesread != -1) {
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char[] cbuf = new char[1000];
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bytesread = queryspec.read(cbuf);
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System.out.print(cbuf);
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}
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*/
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SAXParser parser = initializeParser();
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try {
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parser.parse(new InputSource(queryspec));
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} catch (SAXException e) {
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System.out.println("error parsing data");
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System.out.println(e.getMessage());
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}
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}
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query as a String
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*/
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public QuerySpecification( String queryspec ) throws IOException {
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this(new StringReader(queryspec));
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}
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/** Main routine for testing */
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static public void main(String[] args) {
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if (args.length < 1) {
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java QuerySpecification <xmlfile>");
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return;
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} else {
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String xmlfile = args[0];
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try {
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FileReader xml = new FileReader(new File(xmlfile));
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QuerySpecification qspec = new QuerySpecification(xml);
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} catch (IOException e) {
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System.err.println(e.getMessage());
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}
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}
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}
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private SAXParser initializeParser() {
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SAXParser parser = null;
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//
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// Set up the SAX document handlers for parsing
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//
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try {
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// For all the other interface use the default provided by
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// Handler base
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HandlerBase defHandler = new HandlerBase();
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// Get an instance of the parser
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parser = new SAXParser();
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// Set Handlers in the parser
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// Set the DocumentHandler to XMLDocumentHandler
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parser.setDocumentHandler(this);
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// Set the other Handler to the defHandler
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parser.setErrorHandler(defHandler);
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} catch (Exception e) {
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System.err.println(e.toString());
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}
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return parser;
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}
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public void startElement (String name, AttributeList atts)
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throws SAXException {
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System.out.println(name);
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}
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public void endElement (String name) throws SAXException {
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}
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}
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