Metacat

/**

 *      Name: QuerySpecification.java

 *   Purpose: A Class that represents a structured query, and can be 

 *            constructed from an XML serialization

 * Copyright: 2000 Regents of the University of California and the

 *            National Center for Ecological Analysis and Synthesis

 *   Authors: Matt Jones

 *

 *   Version: '$Id: QuerySpecification.java 155 2000-06-14 20:54:13Z jones $'

 */

package edu.ucsb.nceas.metacat;

import java.io.*;

import java.net.URL;

import java.net.MalformedURLException;

import java.util.Stack;

import java.util.Hashtable;

import java.util.Enumeration;

import org.xml.sax.*;

import oracle.xml.parser.v2.SAXParser;

/** 

 * A Class that represents a structuredd query,and can be constructed from an

 * XML serialization

 */

public class QuerySpecification extends HandlerBase {

  /**

   * construct an instance of the QuerySpecification class 

   *

   * @param queryspec the XML representation of the query as a Reader

   */

  public QuerySpecification( Reader queryspec ) throws IOException {

    super();

/*

    int bytesread = 0;

    while (bytesread != -1) {

      char[] cbuf = new char[1000];

      bytesread = queryspec.read(cbuf);

      System.out.print(cbuf);

    }

*/

    SAXParser parser = initializeParser();

    try {

      parser.parse(new InputSource(queryspec));

    } catch (SAXException e) {

      System.out.println("error parsing data");

      System.out.println(e.getMessage());

    }

  }

  /**

   * construct an instance of the QuerySpecification class 

   *

   * @param queryspec the XML representation of the query as a String

   */

  public QuerySpecification( String queryspec ) throws IOException {

    this(new StringReader(queryspec));

  }

  /** Main routine for testing */

  static public void main(String[] args) {

     if (args.length < 1) {

       System.err.println("Wrong number of arguments!!!");

       System.err.println("USAGE: java QuerySpecification <xmlfile>");

       return;

     } else {

       String xmlfile  = args[0];

       try {

         FileReader xml = new FileReader(new File(xmlfile));

         QuerySpecification qspec = new QuerySpecification(xml);

       } catch (IOException e) {

         System.err.println(e.getMessage());

       }

     }

  }

  private SAXParser initializeParser() {

    SAXParser parser = null;

    //

    // Set up the SAX document handlers for parsing

    //

    try {

      // For all the other interface use the default provided by

      // Handler base

      HandlerBase defHandler = new HandlerBase();

      // Get an instance of the parser

      parser = new SAXParser();

      // Set Handlers in the parser

      // Set the DocumentHandler to XMLDocumentHandler

      parser.setDocumentHandler(this);

      // Set the other Handler to the defHandler

      parser.setErrorHandler(defHandler);

    } catch (Exception e) {

       System.err.println(e.toString());

    }

    return parser;

  }

  public void startElement (String name, AttributeList atts) 

         throws SAXException {

    System.out.println(name);

  }

  public void endElement (String name) throws SAXException {

  }

}