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DynamicJasper (DJ) is an API that hides the complexity of Jasper Reports, it helps developers to save time when designing simple/medium complexity reports generating the layout of the report elements automatically. It creates reports dynamically, defining at runtime the columns, column width (auto width), groups, variables, fonts, charts, crosstabs, sub reports (that can also be dynamic), page size and everything else that you can define at design time. DJ keeps full compatibility with Jasper Reports since it's a tool that helps create reports programmatically in a easy way (it only interferes with the creation of the report design doing the layout of the elements). You can use the classic .jrxml files as templates while the content and layout of the report elements are handled by the DJ API. http://dynamicjasper.com

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/*
 * DynamicJasper: A library for creating reports dynamically by specifying
 * columns, groups, styles, etc. at runtime. It also saves a lot of development
 * time in many cases! (http://sourceforge.net/projects/dynamicjasper)
 *
 * Copyright (C) 2008  FDV Solutions (http://www.fdvsolutions.com)
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 */

package ar.com.fdvs.dj.util;

import java.lang.reflect.InvocationTargetException;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Alejandro Gomez
*         Date: Feb 26, 2007
*         Time: 10:27:32 AM
*/
public class MultiPropertyComparator implements Comparator {

    private static final Log LOGGER = LogFactory.getLog(MultiPropertyComparator.class);

    private List info;

    /**
     * 
     * @param _info List
     */
    public MultiPropertyComparator(final List _info) {
        info = _info;
    }

    public int compare(final Object _o1, final Object _o2) {
        int result = 0;
        for (int i = 0; result == 0 && i < info.size(); i++) {
            final SortInfo sortInfo = (SortInfo)info.get(i);
            try {
                final String propertyName = sortInfo.getPropertyName();
                final Comparable value1 = getValue(_o1, propertyName);
                final Comparable value2 = getValue(_o2, propertyName);
                result = compare(value1, value2) * (sortInfo.isAscending() ? 1 : -1);
            } catch (IllegalAccessException ex) {
                LOGGER.warn(ex);
            } catch (InvocationTargetException ex) {
                LOGGER.warn(ex);
            } catch (NoSuchMethodException ex) {
                LOGGER.warn(ex);
            }
        }
        return result;
    }

    private static Comparable getValue(final Object _object, final String _field) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        final Object value = PropertyUtils.getProperty(_object, _field);
        if (value == null)
        	return null;
        
        if (!(value instanceof Comparable))
        	throw new RuntimeException("Objects are not Comparable, class " + value.getClass().getName());
		
		return (Comparable) value;
    }

	private static int compare(final Comparable _value1, final Comparable _value2) {
        if (_value1 == null) {
            if (_value2 == null) {
                return 0;
            } else {
                return -1;
            }
        } else if (_value2 == null) {
            return 1;
        } else {
            return _value1.compareTo(_value2);
        }
    }
}