KeyValueOption.java revision 953:221a84ef44c0 
1/*
2 * Copyright (c) 2010, 2013, 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24 */
25
26package jdk.nashorn.internal.runtime.options;
27
28import java.util.Collections;
29import java.util.LinkedHashMap;
30import java.util.Map;
31import java.util.StringTokenizer;
32
33/**
34 * Key Value option such as logger. It comes on the format
35 * such as:
36 *
37 * {@code --log=module1:level1,module2:level2... }
38 */
39public class KeyValueOption extends Option<String> {
40    /**
41     * Map of keys given
42     */
43    protected Map<String, String> map;
44
45    KeyValueOption(final String value) {
46        super(value);
47        initialize();
48    }
49
50    Map<String, String> getValues() {
51        return Collections.unmodifiableMap(map);
52    }
53
54    /**
55     * Check if the key value option has a value or if it has not
56     * been initialized
57     * @param key the key
58     * @return value, or null if not initialized
59     */
60    public boolean hasValue(final String key) {
61        return map != null && map.get(key) != null;
62    }
63
64    String getValue(final String key) {
65        if (map == null) {
66            return null;
67        }
68        final String val = map.get(key);
69        return "".equals(val) ? null : val;
70    }
71
72    private void initialize() {
73        if (getValue() == null) {
74            return;
75        }
76
77        map = new LinkedHashMap<>();
78
79        final StringTokenizer st = new StringTokenizer(getValue(), ",");
80        while (st.hasMoreElements()) {
81            final String   token    = st.nextToken();
82            final String[] keyValue = token.split(":");
83
84            if (keyValue.length == 1) {
85                map.put(keyValue[0], "");
86            } else if (keyValue.length == 2) {
87                map.put(keyValue[0], keyValue[1]);
88            } else {
89                throw new IllegalArgumentException(token);
90            }
91        }
92    }
93}
94