Quadcap Embeddable Database

com/quadcap/text/sax/Handler.java

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package com.quadcap.text.sax;

/* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;

import java.util.Hashtable;

import org.xml.sax.AttributeList;
import org.xml.sax.DocumentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Parser;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import org.xml.sax.helpers.ParserFactory;

import com.quadcap.util.Debug;
import com.quadcap.util.ConfigString;

/**
 * General purpose sax handler class.
 *
 * @author Stan Bailes
 */
public class Handler implements DocumentHandler, ErrorHandler {
    protected Object            context         = null;
    protected Hashtable         env             = new Hashtable();
    protected StringBuffer      data            = new StringBuffer("");

    Parser                      parser;
    Locator                     locator;

    /**
     * Construct a new parser
     */
        try {
            ConfigString ps = ConfigString.find("xml.sax.parser",
                                                "com.quadcap.text.sax.Parser");
            this.parser =
                (Parser)(Class.forName(ps.toString(), true, cl).newInstance());
            parser.setDocumentHandler(this);
            parser.setErrorHandler(this);
        } catch (Exception e) {
            Debug.print(e);
            throw new SAXException(e);
        }
    }

    /**
     * Parse the specified file the context of the
     * specified web application.
     *
     * @param dd the inputstream containing the deployment descriptor
     * @param app the web application being constructed
     */
    public void parse(Reader r, Object context)
    {
        this.context = context;
        try {
            throw e;
        } catch (Exception e) {
            Debug.print(e);
        }
    }

    /**
     * SAX parser callback to handle XML Parser errors.
     * This implementation just prints them
     * to System.err.
     *
     * @param exception the exception generated by the parser.
     */
        System.err.println("error");
        exception.printStackTrace(System.err);
    }

    /**
     * SAX parser callback to handle XML Parser fatal errors.
     * This implementation just prints them
     * to System.err.
     *
     * @param exception the exception generated by the parser.
     */
        System.err.println("fatal error");
        exception.printStackTrace(System.err);
    }

    /**
     * SAX parser callback to handle XML Parser fatal errors.  
     * This implementation just prints them
     * to System.err.
     *
     * @param exception the exception generated by the parser.
     */
        System.err.println("warning");
        exception.printStackTrace(System.err);
    }

    /**
     * SAX parser callback to handle character data found in the 
     * parsed document.
     *
     * @param ch the buffer containing the parsed characters.
     * @param star the buffer position of the first character
     * @param length the number of characters
     *
     * @exception SAXException may be thrown if this data represents
     *          a database value and there's a SQL exception thrown while
     *          trying to update the underlying resultset object with this
     *          data.
     */
    public void characters(char[] ch, int start, int length) 
    {
        data.append(ch, start, length);
    }

    /**
     * SAX parser callback function that is called when the end of the 
     * document is reached.  This implementation does nothing.
     */
    public void endDocument() {
    }

    /**
     * SAX parser callback function called for the end of an element. 
     *
     * @param name the name of this element
     * @exception SAXException may be thrown 
     */
    }


        String ret = (String)env.get(name);
        if (ret != null) {
            env.remove(name);
        }
        return ret;
    }

        String ret = consumeAny(name);
        if (ret == null) {
        }
        return ret;
    }

    protected final String consumeData() {
        String ret = data.toString().trim();
        data.setLength(0);
        return ret;
    }

    /**
     * SAX parser callback for ignorable whitespace.  We just ignore it
     *
     * @param ch the buffer containing the parsed characters.
     * @param star the buffer position of the first character
     * @param length the number of characters
     */
    public void ignorableWhitespace(char[] ch, int start, int length) {
    }

    /**
     * SAX parser callback for processing instructions.  This implementation
     * does nothing.
     *
     * @param target the processing instruction target.
     * @param data the processing instruction data.
     */
    public void processingInstruction(String target, String data) {
    }

    /**
     * SAX parser callback used to receive a document locator.
     *
     * @param locator the parser's locator object.
     */
    public void setDocumentLocator(Locator locator) {
        this.locator = locator;
    }

    /**
     * SAX parser callback for document start.
     * This implementation does nothing.
     */
    public void startDocument() {
    }

    /**
     * SAX parser callback for the start of an element.
     *
     * @param name the element name
     * @param attrs the element's attributes
     *
     * @exception SAXException may be thrown
     */
    public void startElement(String name, AttributeList attrs) 
    {
        data.setLength(0);
    }



}