001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.spring.data;
023
024import javax.persistence.criteria.CriteriaBuilder;
025import javax.persistence.criteria.Path;
026import javax.persistence.criteria.Predicate;
027
028
029public class FilterSpecUtil {
030
031        public static Predicate buildPredicate(Path<?> root, CriteriaBuilder builder, Class<?> type, String key, Object value) {
032                if (value == null)
033                        return null;
034                
035                if (type == null)
036                        type = value.getClass();
037                
038                if (type == String.class && value.toString().trim().length() == 0)
039                        return null;
040                
041                if (value instanceof String)
042                        return builder.like(root.get(key).as(String.class), "%" + value + "%");
043                
044                return builder.equal(root.get(key).as(type), value);
045        }
046}