1 /*
2 * This file is part of *** M y C o R e ***
3 * See http://www.mycore.de/ for details.
4 *
5 * MyCoRe is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * MyCoRe is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with MyCoRe. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 package org.mycore.services.fieldquery;
20
21 import org.jdom2.Element;
22 import org.mycore.parsers.bool.MCRCondition;
23
24 /**
25 * Represents a simple query condition, which consists of a search field,
26 * a value and a comparison operator.
27 *
28 * @author Frank Lützenkirchen
29 */
30 public class MCRQueryCondition extends MCRFieldBaseValue implements MCRCondition<Void> {
31
32 /** The comparison operator used in this condition */
33 private String operator;
34
35 public MCRQueryCondition(String fieldName, String operator, String value) {
36 super(fieldName, value);
37 this.operator = operator;
38 }
39
40 public void setOperator(String operator) {
41 this.operator = operator;
42 }
43
44 /** Returns the comparison operator used in this condition */
45 public String getOperator() {
46 return this.operator;
47 }
48
49 @Override
50 public String toString() {
51 return getFieldName() + " " + getOperator() + " \"" + getValue() + "\"";
52 }
53
54 public Element toXML() {
55 Element condition = new Element("condition");
56 condition.setAttribute("field", getFieldName());
57 condition.setAttribute("operator", operator);
58 condition.setAttribute("value", getValue());
59
60 return condition;
61 }
62
63 public boolean evaluate(Void o) {
64 //there is no 'void' instance
65 throw new UnsupportedOperationException();
66 }
67 }