BeanComparator.java

package org.objectweb.jonas.webapp.jonasadmin.common;

import java.util.Comparator;

import org.apache.commons.beanutils.PropertyUtils;

public class BeanComparator implements Comparator {

// --------------------------------------------------------- Instance Variables

    private String[] m_Orders = null;

// --------------------------------------------------------- Constructors

    public BeanComparator() {
        m_Orders = null;
    }

    public BeanComparator(String[] p_Orders) {
        m_Orders = p_Orders;
    }

// --------------------------------------------------------- Public Methods

    public int compare(Object p_O1, Object p_O2) {
        if (m_Orders != null) {
            return compareOrder(p_O1, p_O2);
        }
        return compareDefault(p_O1, p_O2);
    }

    public boolean equals(Object p_Obj) {
        if (this.getClass().getName().equals(p_Obj.getClass().getName())) {
            return (compare(this, p_Obj) == 0);
        }
        return false;
    }

    public static int compareNull(Object p_O1, Object p_O2) {
        int iRet = 0;
        if (p_O1 != p_O2) {
            if (p_O1 == null) {
                iRet = 1;
            }
            else if (p_O2 == null) {
                iRet = -1;
            }
        }
        return iRet;
    }

    public static int compareString(String p_S1, String p_S2) {
        int iRet = compareNull(p_S1, p_S2);
        if (iRet == 0) {
            try {
                iRet = p_S1.compareToIgnoreCase(p_S2);
                if (iRet == 0) {
                    iRet = p_S1.compareTo(p_S2);
                }
            }
            catch (NullPointerException e) {
                iRet = 0;
            }
        }
        return iRet;
    }

// --------------------------------------------------------- Protected Methods

    protected int compareDefault(Object p_O1, Object p_O2) {
        int iRet = compareNull(p_O1, p_O2);
        if (iRet == 0) {
            iRet = compareString(p_O1.toString(), p_O2.toString());
        }
        return iRet;
    }

    protected int compareOrder(Object p_O1, Object p_O2) {
        int iRet = 0;
        Object oValue1, oValue2;
        try {
            for (int i = 0; i < m_Orders.length; i++) {
                // Get values
                oValue1 = PropertyUtils.getProperty(p_O1, m_Orders[i]);
                oValue2 = PropertyUtils.getProperty(p_O2, m_Orders[i]);
                // Compare
                iRet = compareNull(oValue1, oValue2);
                if (iRet == 0) {
                    try {
                        iRet = compareString(oValue1.toString(), oValue2.toString());
                    }
                    catch (NullPointerException e) {
                        iRet = 0;
                    }
                }
                // Continue in order if always equals
                if (iRet != 0) {
                    break;
                }
            }
        }
        catch (Exception e) {
            System.err.println("[" + e.getClass().getName() + "] " + e.getMessage());
            iRet = 0;
        }
        return iRet;
    }
}

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