org.projectforge.common.MyBeanComparator.java Source code

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Here is the source code for org.projectforge.common.MyBeanComparator.java

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/////////////////////////////////////////////////////////////////////////////
//
// Project ProjectForge Community Edition
//         www.projectforge.org
//
// Copyright (C) 2001-2013 Kai Reinhard (k.reinhard@micromata.de)
//
// ProjectForge is dual-licensed.
//
// This community edition 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; version 3 of the License.
//
// This community edition 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, see http://www.gnu.org/licenses/.
//
/////////////////////////////////////////////////////////////////////////////

package org.projectforge.common;

import java.util.Comparator;

import org.apache.commons.lang.ClassUtils;

public class MyBeanComparator<T> implements Comparator<T> {
    private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(MyBeanComparator.class);

    private String property;

    private boolean asc;

    public MyBeanComparator(final String property) {
        this(property, true);

    }

    public MyBeanComparator(final String property, final boolean asc) {
        this.property = property;
        this.asc = asc;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public int compare(final T o1, final T o2) {
        try {
            final Object value1 = BeanHelper.getNestedProperty(o1, property);
            final Object value2 = BeanHelper.getNestedProperty(o2, property);
            if (value1 == null) {
                if (value2 == null)
                    return 0;
                else
                    return (asc == true) ? -1 : 1;
            }
            if (value2 == null) {
                return (asc == true) ? 1 : -1;
            }
            if (ClassUtils.isAssignable(value2.getClass(), value1.getClass()) == true) {
                if (asc == true) {
                    return ((Comparable) value1).compareTo(value2);
                } else {
                    return -((Comparable) value1).compareTo(value2);
                }
            } else {
                final String sval1 = String.valueOf(value1);
                final String sval2 = String.valueOf(value2);
                if (asc == true) {
                    return sval1.compareTo(sval2);
                } else {
                    return -sval1.compareTo(sval2);
                }
            }
        } catch (final Exception ex) {
            log.error("Exception while comparing values of property '" + property + "': " + ex.getMessage());
            return 0;
        }
    }
}