001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2012 GRANITE DATA SERVICES S.A.S.
004    
005      This file is part of Granite Data Services.
006    
007      Granite Data Services is free software; you can redistribute it and/or modify
008      it under the terms of the GNU Library General Public License as published by
009      the Free Software Foundation; either version 2 of the License, or (at your
010      option) any later version.
011    
012      Granite Data Services is distributed in the hope that it will be useful, but
013      WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014      FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015      for more details.
016    
017      You should have received a copy of the GNU Library General Public License
018      along with this library; if not, see <http://www.gnu.org/licenses/>.
019    */
020    
021    package org.granite.client.tide.data.impl;
022    
023    import java.util.Date;
024    
025    import org.granite.client.tide.PropertyHolder;
026    import org.granite.client.tide.data.Identifiable;
027    import org.granite.client.tide.data.Lazyable;
028    import org.granite.client.tide.data.spi.DataManager;
029    import org.granite.client.tide.data.spi.EntityDescriptor;
030    
031    /**
032     * @author William DRAI
033     */
034    public class ObjectUtil {
035    
036        public static boolean isSimple(Object value) {
037            return value instanceof String || value instanceof Boolean || value instanceof Number || value instanceof Date;
038        }
039        
040        public static String toString(Object obj) {
041            return obj != null ? obj.toString() : "null";
042        }
043        
044        /**
045         *  Equality for objects, using uid property when possible
046         *
047         *  @param obj1 object
048         *  @param obj2 object
049         * 
050         *  @return true when objects are instances of the same entity
051         */ 
052        public static boolean objectEquals(DataManager dataManager, Object obj1, Object obj2) {
053            if ((obj1 instanceof PropertyHolder && obj2 instanceof Identifiable) || (obj1 instanceof Identifiable && obj2 instanceof PropertyHolder))
054                return false;
055            
056            if (obj1 instanceof Identifiable && obj2 instanceof Identifiable && obj1.getClass() == obj2.getClass()) {
057                if (obj1 instanceof Lazyable && (!((Lazyable)obj1).isInitialized() || !((Lazyable)obj2).isInitialized())) {
058                    // Compare with identifier for uninitialized entities
059                    EntityDescriptor edesc = dataManager.getEntityDescriptor(obj1);
060                    if (edesc.getIdPropertyName() != null)
061                        return objectEquals(dataManager, dataManager.getProperty(obj1, edesc.getIdPropertyName()), dataManager.getProperty(obj2, edesc.getIdPropertyName()));
062                }
063                return ((Identifiable)obj1).getUid().equals(((Identifiable)obj2).getUid());
064            }
065            
066            if (obj1 == null)
067                    return obj2 == null;
068            
069            return obj1.equals(obj2);
070        }
071    }