1/*
2 * Copyright (c) 2004, 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
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.jstat;
27
28import java.util.*;
29
30/**
31 * A typesafe enumeration for describing data alignment semantics
32 *
33 * @author Brian Doherty
34 * @since 1.5
35 */
36public abstract class Alignment {
37
38    private static int nextOrdinal = 0;
39    private static HashMap<String, Alignment> map = new HashMap<String, Alignment>();
40    private static final String blanks = "                                                                                                                                                               ";
41    private final String name;
42    private final int value = nextOrdinal++;
43
44    protected abstract String align(String s, int width);
45
46    /**
47     * Alignment representing a Centered alignment
48     */
49    public static final Alignment CENTER = new Alignment("center") {
50        protected String align(String s, int width) {
51            int length = s.length();
52            if (length >= width) {
53                return s;
54            }
55
56            int pad = width - length;
57            int pad2 = pad / 2;
58            int padr = pad % 2;
59            if (pad2 == 0) {
60              // only 0 or 1 character to pad
61              return s + blanks.substring(0, padr);
62            } else {
63              // pad on both sides
64              return  blanks.substring(0, pad2) + s +
65                      blanks.substring(0, pad2 + padr);
66            }
67        }
68    };
69
70    /**
71     * Alignment representing a Left alignment
72     */
73    public static final Alignment LEFT = new Alignment("left") {
74        protected String align(String s, int width) {
75            int length = s.length();
76            if (length >= width) {
77                return s;
78            }
79            int pad = width - length;
80            return s+blanks.substring(0, pad);
81        }
82    };
83
84    /**
85     * Alignment representing a Right alignment
86     */
87    public static final Alignment RIGHT = new Alignment("right") {
88        protected String align(String s, int width) {
89            int length = s.length();
90            if (length >= width) {
91                return s;
92            }
93            int pad = width - length;
94            return blanks.substring(0, pad) + s;
95        }
96    };
97
98    /**
99     * Maps a string value to its corresponding Alignment object.
100     *
101     * @param   s  an string to match against Alignment objects.
102     * @return     The Alignment object matching the given string.
103     */
104    public static Alignment toAlignment(String s) {
105        return map.get(s);
106    }
107
108    /**
109     * Returns an enumeration of the keys for this enumerated type
110     *
111     * @return     Set of Key Words for this enumeration.
112     */
113    public static Set<String> keySet() {
114        return map.keySet();
115    }
116
117    public String toString() {
118        return name;
119    }
120
121    private Alignment(String name) {
122        this.name = name;
123        map.put(name, this);
124    }
125}
126