/jboss-as-7.1.1.Final/modcluster/src/main/java/org/jboss/as/modcluster/ZeroToNegativeOneParameterCorrector.java

 1/*
 2 * JBoss, Home of Professional Open Source.
 3 * Copyright 2012, Red Hat, Inc., and individual contributors
 4 * as indicated by the @author tags. See the copyright.txt file in the
 5 * distribution for a full listing of individual contributors.
 6 *
 7 * This is free software; you can redistribute it and/or modify it
 8 * under the terms of the GNU Lesser General Public License as
 9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22
23package org.jboss.as.modcluster;
24
25import org.jboss.as.controller.ParameterCorrector;
26import org.jboss.dmr.ModelNode;
27import org.jboss.dmr.ModelType;
28
29/**
30 * {@link ParameterCorrector} that converts 0 to -1. Used for attributes that have historically allowed -1 as
31 * a "disabled" value but otherwise require a positive value. This parameter corrector allows an IntRangeValidator
32 * with a range starting at -1 to be used, while avoiding having 0 as a value. Ideally, "undefined" would mean disabled,
33 * and an IntRangeValidator starting at 1 would be used, but these -1 attributes have been out in the wild for quite
34 * a while now so they need to be supported.
35 *
36 * @author Brian Stansberry (c) 2011 Red Hat Inc.
37 */
38class ZeroToNegativeOneParameterCorrector implements ParameterCorrector {
39
40    static final ZeroToNegativeOneParameterCorrector INSTANCE = new ZeroToNegativeOneParameterCorrector();
41
42    @Override
43    public ModelNode correct(ModelNode newValue, ModelNode currentValue) {
44        if (newValue.isDefined() && newValue.getType() != ModelType.EXPRESSION) {
45            try {
46                long val = newValue.asLong();
47                if (val == 0) {
48                    return new ModelNode(-1);
49                }
50            } catch (Exception e) {
51                // not convertible; let the validator that the caller will invoke later deal with this
52            }
53        }
54        return newValue;
55    }
56}