Metacat

<%@page 

import="java.util.Iterator"%><%@page 

import="java.util.ArrayList"%><%@page 

import="edu.ucsb.nceas.utilities.OrderedMap"%><%@page 

import="java.util.List"%><%@page 

import="java.util.Enumeration"%><%@page 

import="java.sql.SQLException"%><%@page 

import="org.ecoinformatics.datamanager.transpose.DataTranspose"%><%@page 

import="au.com.bytecode.opencsv.CSVWriter"%><%@page 

import="java.io.OutputStreamWriter"%><%@page 

import="java.io.Writer"%><%@page 

import="java.sql.ResultSet"%><%@page 

import="edu.ucsb.nceas.metacat.dataquery.DataQuery"%><%@page 

import="java.io.IOException"%><%@page 

import="edu.ucsb.nceas.utilities.PropertyNotFoundException"%><%@page 

import="java.util.Hashtable"%><%@ page 

language="java" %><%

/**

 * 

 * '$RCSfile$'

 * Copyright: 2008 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    '$Author: leinfelder $'

 *      '$Date: 2008-08-22 16:48:56 -0700 (Fri, 22 Aug 2008) $'

 * '$Revision: 4305 $'

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 * 

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */  

%><%

Hashtable params = getParams(request);

handleDataquery(params,response,request.getSession().getId());

%><%!

	private Hashtable getParams(HttpServletRequest request) {

		Hashtable params = new Hashtable();

		Enumeration<String> paramlist = (Enumeration<String>)request.getParameterNames();

		while (paramlist.hasMoreElements()) {

			String name = paramlist.nextElement();

			String[] value = request.getParameterValues(name);

			params.put(name, value);

		}

		return params;

	}

%><%!

	private List transpose(ResultSet rs, int idCol, int pivotCol, List pivotAttributes, boolean omitIdValues) throws SQLException {

		OrderedMap table = new OrderedMap();

		OrderedMap widestRow = new OrderedMap();

		int colCount = rs.getMetaData().getColumnCount();

		String idColName = rs.getMetaData().getColumnName(idCol);

		while (rs.next()) {

			String id = rs.getString(idCol);

			String pivotValue = rs.getString(pivotCol);

			//look up the row we are working on

			OrderedMap row = (OrderedMap) table.get(id);

			if (row == null) {

				row = new OrderedMap();

			}

			//get the values for this pivot

			for (int i = 1; i <= colCount; i++) {

				if (i != pivotCol) {

					String colName = rs.getMetaData().getColumnName(i);

					//do we include this column in the pivot?

					if (pivotAttributes.contains(colName)) {

						//annotate the column name with the pivot column value if not the id column

						if (i != idCol) {

							colName = pivotValue + "_" + colName;

						}

						String value = rs.getString(i);

						row.put(colName, value);

					}

				}

			}

			//track the headers - the values are junk

			widestRow.putAll(row);

			//put the row back (or maybe it's the first time)

			table.put(id, row);	

		}

		//now make it into a list

		List retTable = new ArrayList();

		//do the header, based on widest entry

		List header = new ArrayList(widestRow.keySet());

		retTable.add(header.toArray(new String[0]));

		//now the value rows

		Iterator rowIter = table.values().iterator();

		int rowCount = 1;

		while (rowIter.hasNext()) {

			OrderedMap rowMap = (OrderedMap) rowIter.next();

			List row = new ArrayList();

			//iterate over the widest row's columns

			Iterator columnIter = widestRow.keySet().iterator();

			while (columnIter.hasNext()) {

				Object key = columnIter.next();

				Object value = rowMap.get(key);

				//hide the value used for Ids - just increment row

				if (key.equals(idColName) && omitIdValues) {

					value = String.valueOf(rowCount);

				}

				row.add(value);

			}

			rowCount++;

			retTable.add(row.toArray(new String[0]));

		}

		return retTable;

	}

%><%!

	private void handleDataquery(

			Hashtable<String, String[]> params,

	        HttpServletResponse response,

	        String sessionId) throws PropertyNotFoundException, IOException {

		DataQuery dq = null;

		if (sessionId != null) {

			dq = new DataQuery(sessionId);

		}

		else {

			dq = new DataQuery();

		}

		String dataqueryXML = (params.get("dataquery"))[0];

		ResultSet rs = null;

		try {

			rs = dq.executeQuery(dataqueryXML);

		} catch (Exception e) {

			//probably need to do something here

			e.printStackTrace();

			return;

		}

		//process the result set

		String qformat = "csv";

		String[] temp = params.get("qformat");

		if (temp != null && temp.length > 0) {

			qformat = temp[0];

		}

		String fileName = "query-results." + qformat;

		boolean transpose = false;

		temp = params.get("transpose");

		if (temp != null && temp.length > 0) {

			transpose = Boolean.parseBoolean(temp[0]);

		}

		int observation = 0;

		temp = params.get("observation");

		if (temp != null && temp.length > 0) {

			observation = Integer.parseInt(temp[0]);

		}

		int pivot = 0;

		temp = params.get("pivot");

		if (temp != null && temp.length > 0) {

			pivot = Integer.parseInt(temp[0]);

		}

		//get the results as csv file

		if (qformat != null && qformat.equalsIgnoreCase("csv")) {

			response.setContentType("text/csv");

			//response.setContentType("application/csv");

	        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);

			Writer writer = new OutputStreamWriter(response.getOutputStream());

			CSVWriter csv = new CSVWriter(writer, CSVWriter.DEFAULT_SEPARATOR, CSVWriter.NO_QUOTE_CHARACTER);

			try {

				if (transpose) {

					List pivotCols = new ArrayList();

					pivotCols.add("studentid");

					pivotCols.add("score");

					pivotCols.add("response");

					List transposedTable = transpose(rs, observation, pivot, pivotCols, true);

					csv.writeAll(transposedTable);

				} else {

					csv.writeAll(rs, true);

				}

				csv.flush();

				response.flushBuffer();

				rs.close();

			} catch (SQLException e) {

				e.printStackTrace();

			}

			return;

		}

	}

%>