1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package chapters.onJoran.calculator;
15
16
17
18 import org.xml.sax.Attributes;
19
20 import ch.qos.logback.core.joran.action.Action;
21 import ch.qos.logback.core.joran.spi.InterpretationContext;
22 import ch.qos.logback.core.util.OptionHelper;
23
24
25 /**
26 * ComputationAction1 will print the result of the compuration made by
27 * children elements but only if the compuration itself is named, that is if the
28 * name attribute of the associated computation element is not null. In other
29 * words, anonymous computations will not print their result.
30 *
31 * @author Ceki Gülcü
32 */
33 public class ComputationAction1 extends Action {
34 public static String NAME_ATR = "name";
35
36 String nameStr;
37
38 /**
39 * Store the value of the name attribute for future use.
40 */
41 public void begin(InterpretationContext ec, String name, Attributes attributes) {
42 nameStr = attributes.getValue(NAME_ATR);
43 }
44
45 /**
46 * Children elements have been processed. The sesults should be an integer
47 * placed at the top of the execution stack.
48 *
49 * This value will be printed on the console but only if the action is
50 * named. Anonymous computation will not print their result.
51 */
52 public void end(InterpretationContext ec, String name) {
53 if (OptionHelper.isEmpty(nameStr)) {
54 // nothing to do
55 } else {
56 Integer i = (Integer) ec.peekObject();
57 System.out.println(
58 "The computation named [" + nameStr + "] resulted in the value " + i);
59 }
60 }
61 }