org.sakaiproject.lti.impl.ExporterCSV.java Source code

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Here is the source code for org.sakaiproject.lti.impl.ExporterCSV.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/

package org.sakaiproject.lti.impl;

import java.io.OutputStream;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.component.cover.ServerConfigurationService;
import org.sakaiproject.lti.api.LTIExporter;

public class ExporterCSV implements LTIExporter {
    private StringBuilder result;
    private String csvSeparator;
    private boolean emptyLine = true;

    private static Log M_log = LogFactory.getLog(ExporterCSV.class);

    public ExporterCSV() {
        result = new StringBuilder();
        csvSeparator = ServerConfigurationService.getString("csv.separator", ",");
    }

    /* (non-Javadoc)
     * @see org.sakaiproject.basiclti.util.LTIExporter#newLine()
     */
    @Override
    public void newLine() {
        if (result.length() > 0)
            result.append("\n");
        emptyLine = true;
    }

    /* (non-Javadoc)
     * @see org.sakaiproject.basiclti.util.LTIExporter#addCell(java.lang.String)
     */
    @Override
    public void addCell(String text) {
        if (result.length() > 0 && !emptyLine)
            result.append(csvSeparator);

        result.append(escapeText(text));
        emptyLine = false;
    }

    /* (non-Javadoc)
     * @see org.sakaiproject.basiclti.util.LTIExporter#write()
     */
    @Override
    public void write(OutputStream out) {
        try {
            out.write(result.toString().getBytes());
        } catch (Exception e) {
            M_log.error("Error exporting to CSV : " + e.getMessage());
        }
    }

    private String escapeText(String text) {
        if (text == null)
            return "";

        if (text.contains("\""))
            text = text.replace("\"", "\"\"");
        if (StringUtils.indexOfAny(text, new String[] { "\"", "\n", "\r", csvSeparator }) > -1)
            text = '"' + text + '"';

        return text;
    }
}