org.hpccsystems.ws.client.utils.DatasetParser Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright (c) 2011 HPCC Systems. All rights reserved. This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: HPCC Systems - initial API and implementation
 ******************************************************************************/
package org.hpccsystems.ws.client.utils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class DatasetParser
{

    private SAXParserFactory parserFactory;

    class DatasetHandler extends StackHandler
    {
        Map> data;

        long                            row;
        int                             col;

        DatasetHandler(long row, Map> data)
        {
            super();
            this.row = row;
            col = 0;
            this.data = data;
        }

        @Override
        public void endElement(String uri, String localName, String qName) throws SAXException
        {
            assert (!elementStack.empty());
            switch (elementStack.size())
            {
                case 2:
                    ++row;
                    col = 0;
                    break;
                case 3:
                    Element e = elementStack.peek();
                    if (col == 0)
                    {
                        data.put(row, new HashMap());
                    }

                    data.get(row).put(col, e.content.toString());
                    ++col;
                    break;
                default:
                    break;
            }
            super.endElement(uri, localName, qName);
        }
    }

    public DatasetParser(long start, InputSource is, Map> data)
    {
        parserFactory = SAXParserFactory.newInstance();

        SAXParser parser = null;
        parserFactory.setValidating(false);

        try
        {
            parser = parserFactory.newSAXParser();
        }
        catch (SAXException e)
        {
            e.printStackTrace();
        }
        catch (ParserConfigurationException e)
        {
            e.printStackTrace();
        }

        DatasetHandler handler = new DatasetHandler(start, data);
        try
        {
            parser.parse(is, handler);
        }
        catch (SAXException e)
        {
            // If there is an error we may end up here.
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}