📄 htmltablewriter.java

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/*  Sesame - Storage and Querying architecture for RDF and RDF Schema *  Copyright (C) 2001-2005 Aduna * *  Contact:  *  	Aduna *  	Prinses Julianaplein 14 b *  	3817 CS Amersfoort *  	The Netherlands *  	tel. +33 (0)33 465 99 87 *  	fax. +33 (0)33 465 99 87 * *  	http://aduna.biz/ *  	http://www.openrdf.org/ *   *  This library is free software; you can redistribute it and/or *  modify it under the terms of the GNU Lesser General Public *  License as published by the Free Software Foundation; either *  version 2.1 of the License, or (at your option) any later version. * *  This library 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 *  Lesser General Public License for more details. * *  You should have received a copy of the GNU Lesser General Public *  License along with this library; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */package org.openrdf.sesame.query;import java.io.IOException;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.Writer;import java.util.Iterator;import org.openrdf.util.xml.XmlUtil;import org.openrdf.model.Resource;import org.openrdf.model.Value;import org.openrdf.sesame.query.rql.model.Intersection;import org.openrdf.sesame.server.http.RdfExplorerUtil;/** * A TableQueryResultListener that converts the query results into an HTML document. **/public class HtmlTableWriter implements TableQueryResultListener {/*----------------------------------------------+| Variables                                     |+----------------------------------------------*/	protected Writer _out;	protected String _repository;	protected String _resultId;	protected String _styleSheetUrl;	protected int _nrOfResults;	protected int _nrOfColumns;	protected long _startTime;	protected boolean _tupleOpen, _tableOpen;/*----------------------------------------------+| Constructors                                  |+----------------------------------------------*/	public HtmlTableWriter(OutputStream out, String repository, String styleSheetUrl)		throws IOException	{		this(out, repository, styleSheetUrl, "query_result");	}	public HtmlTableWriter(OutputStream out, String repository, String styleSheetUrl, String resultId)		throws IOException	{		_out = new OutputStreamWriter(out, "UTF-8");		_repository = repository;		_resultId = resultId;		_styleSheetUrl = styleSheetUrl;		_tupleOpen = false;		_tableOpen = false;				// XXX: this is a bit of a hack, but want to include parsing and		// optimization time in the evaluation time.		_startTime = System.currentTimeMillis();	}/*----------------------------------------------+| Methods                                       |+----------------------------------------------*/	public void startTableQueryResult()		throws IOException	{		_nrOfResults = 0;		_out.write("<html>\n");		_out.write("<head>\n");		if (_styleSheetUrl != null) {			_out.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"" + _styleSheetUrl + "\">\n");		}		_out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">");		_out.write("<title>Query Results</title>\n");		_out.write("</head>\n");		_out.write("<body bgcolor=\"white\">\n");		_out.write("<table>\n");		_out.write("<tr><th class=\"nobg\"");		if (_nrOfColumns > 0) {			_out.write(" colspan=\"" + _nrOfColumns + "\"");		}		_out.write(">Query results:</th></tr>\n");		_tableOpen = true;	}	public void startTableQueryResult(String[] columnHeaders) 		throws IOException 	{		_nrOfColumns = columnHeaders.length;		startTableQueryResult();		_out.write("  <tr>\n");		for (int i = 0; i < _nrOfColumns; i++) {			_out.write("    <th>");			_out.write( XmlUtil.escapeChars(columnHeaders[i]) );			_out.write("</th>\n");		}		_out.write("  </tr>\n");	}			public void endTableQueryResult()		throws IOException	{		long evalTime = System.currentTimeMillis() - _startTime;		if (_tupleOpen) {			endTuple();		}		if (_tableOpen) {			_out.write("<tr><td class=\"nobg\"");			if (_nrOfColumns > 0) {				_out.write(" colspan=\"" + _nrOfColumns + "\"");			}			_out.write(">");			_out.write(_nrOfResults + " results found in " + evalTime + " ms.</td></tr>\n");			endTable();		}		else {			_out.write("<p>" + _nrOfResults + " results found in " + evalTime + " ms.</p>\n");		}		_out.write("</body>\n");		_out.write("</html>\n");		_out.flush();		_out.close();	}	public void startTuple()		throws IOException	{		_nrOfResults++;		_out.write("  <tr>\n");		_tupleOpen = true;	}	public void endTuple()		throws IOException	{		_out.write("  </tr>\n");		_tupleOpen = false;	}	public void tupleValue(Value value)		throws IOException	{		_out.write("      <td>");		if (value == null) {			_out.write("NULL");		}		else if (value instanceof Intersection) {			Intersection intersect = (Intersection)value;			Iterator iter = intersect.getMembers().iterator();			if (iter.hasNext()) {				_out.write("{&nbsp;\n");				while (iter.hasNext()) {					_writeValueLink( (Resource)iter.next() );					if (iter.hasNext()) {						_out.write(",<br>&nbsp;&nbsp;\n");					}				}				_out.write("&nbsp;}\n");			}			else {				_out.write("{}\n");			}		}		else {			_writeValueLink(value);		}		_out.write("</td>\n");	}	private void _writeValueLink(Value value)		throws IOException	{		_out.write("<a target=\"rdfexplore\" href=\"");		_out.write("../explorer/show.jsp?");		_out.write(RdfExplorerUtil.getQueryString(_repository, value, false));		_out.write("\">");		_out.write(XmlUtil.escapeChars(RdfExplorerUtil.getDisplayString(value)));		_out.write("</a>");	}	public void error(QueryErrorType errType, String msg)		throws IOException	{		if (!_tableOpen) {			startTableQueryResult();		}		else if (_tupleOpen) {			endTuple();		}		_out.write("<tr><td");		if (_nrOfColumns > 0) {			_out.write(" colspan="+_nrOfColumns + ">");		}		else {			_out.write(">");		}		_out.write("<font color=\"red\">");		if (errType == QueryErrorType.MALFORMED_QUERY_ERROR) {			_out.write("Malformed query error: ");		}		else if (errType == QueryErrorType.QUERY_EVALUATION_ERROR) {			_out.write("Query evaluation error: ");		}		else {			_out.write("Error: ");		}		_out.write(XmlUtil.escapeChars(msg));		_out.write("</font></td></tr>\n");	}	protected void endTable() 		throws IOException	{		_out.write("</table>\n");		_tableOpen = false;	}}
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