us.mn.state.health.lims.common.provider.reports.toplink.QueryResultDataSource.java Source code

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Here is the source code for us.mn.state.health.lims.common.provider.reports.toplink.QueryResultDataSource.java

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/**
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (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.mozilla.org/MPL/ 
* 
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations under
* the License.
* 
* The Original Code is OpenELIS code.
* 
* Copyright (C) The Minnesota Department of Health.  All Rights Reserved.
*/
package us.mn.state.health.lims.common.provider.reports.toplink;

import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.List;

import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;

import org.apache.commons.beanutils.PropertyUtils;

import us.mn.state.health.lims.common.log.LogEvent;

/**
 * @author benzd1
 *
 */
public class QueryResultDataSource implements JRDataSource {

    private Iterator iterator;

    private Object currentValue;

    /**
     * @param list
     */
    public QueryResultDataSource(List list) {
        this.iterator = list.iterator();
    }

    /* (non-Javadoc)
     * @see net.sf.jasperreports.engine.JRDataSource#getFieldValue(net.sf.jasperreports.engine.JRField)
     */
    public Object getFieldValue(JRField field) throws JRException {
        Object value = null;

        try {
            Method getter = PropertyUtils
                    .getReadMethod(PropertyUtils.getPropertyDescriptor(currentValue, field.getName()));
            value = getter.invoke(currentValue, (Object[]) null);

        } catch (Exception ex) {
            //bugzilla 2154
            LogEvent.logError("QueryResultDataSource", "getFieldValue()", ex.toString());
        }
        return value;
    }

    /* (non-Javadoc)
     * @see net.sf.jasperreports.engine.JRDataSource#next()
     */
    public boolean next() throws JRException {
        currentValue = iterator.hasNext() ? iterator.next() : null;
        return (currentValue != null);
    }
}