ValueHandler.java revision 1870:4aa2e64eff30 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24package jdk.test.failurehandler.value;
25
26import jdk.test.failurehandler.Utils;
27
28import java.lang.reflect.Field;
29import java.lang.reflect.Modifier;
30import java.util.Objects;
31import java.util.Properties;
32
33public final class ValueHandler {
34    public static <T> void apply(T object, Properties properties,
35                                 String prefix) throws InvalidValueException {
36        Objects.requireNonNull(object, "object cannot be null");
37        Objects.requireNonNull(properties, "properties cannot be null");
38        Class<?> aClass = object.getClass();
39        while (aClass != null) {
40            for (Field field : aClass.getDeclaredFields()) {
41                Value p = field.getAnnotation(Value.class);
42                if (p != null) {
43                    applyToField(p, object, field, properties, prefix);
44                } else {
45                    SubValues sub
46                            = field.getAnnotation(SubValues.class);
47                    if (sub != null) {
48                        getAccess(field);
49                        try {
50                            apply(field.get(object), properties,
51                                    Utils.prependPrefix(prefix, sub.prefix()));
52                        } catch (IllegalAccessException e) {
53                            throw new InvalidValueException(String.format(
54                                    "can't apply sub properties to %s.",
55                                    field.getName()));
56                        }
57                    }
58                }
59            }
60            aClass = aClass.getSuperclass();
61        }
62    }
63
64    private static void applyToField(Value property, Object object,
65                Field field, Properties properties, String prefix)
66            throws InvalidValueException {
67        getAccess(field);
68        if (Modifier.isFinal(field.getModifiers())) {
69            throw new InvalidValueException(
70                    String.format("field '%s' is final", field));
71        }
72        String name = Utils.prependPrefix(prefix, property.name());
73        String value = getProperty(properties, prefix, property.name());
74        if (value == null) {
75            DefaultValue defaultValue
76                    = field.getAnnotation(DefaultValue.class);
77            value = defaultValue == null ? null : defaultValue.value();
78        }
79        if (value == null) {
80            throw new InvalidValueException(String.format(
81                    "can't set '%s', because properties don't have '%s'.",
82                    field.getName(), name));
83        }
84        String delimiter = getProperty(properties,
85                Utils.prependPrefix(prefix, property.name()), "delimiter");
86        delimiter = delimiter == null ? " " : delimiter;
87        Class<? extends ValueParser> parserClass = property.parser();
88        try {
89            field.set(object, parserClass.newInstance().parse(
90                    field.getType(), value, delimiter));
91        } catch (ReflectiveOperationException | IllegalArgumentException e) {
92            throw new InvalidValueException(
93                    String.format("can't set field '%s' : %s",
94                            field.getName(), e.getMessage()), e);
95        }
96    }
97
98    private static String getProperty(Properties properties,
99                                      String prefix, String name) {
100        if (prefix == null || prefix.isEmpty()) {
101            return properties.getProperty(name);
102        }
103        int index = prefix.length();
104        do {
105            String value = properties.getProperty(
106                    Utils.prependPrefix(prefix.substring(0, index), name));
107            if (value != null) {
108                return value;
109            }
110            index = prefix.lastIndexOf('.', index - 1);
111        } while (index > 0);
112        return  properties.getProperty(name);
113    }
114
115    private static void getAccess(Field field) {
116        int modifiers = field.getModifiers();
117        if (!Modifier.isPublic(modifiers)) {
118            field.setAccessible(true);
119        }
120    }
121
122}
123