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| 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 | + | |
| 26 | +package sun.tools.jstat; | |
| 27 | + | |
| 28 | +import java.util.*; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * A typesafe enumeration for describing data alignment semantics | |
| 32 | + * | |
| 33 | + * @author Brian Doherty | |
| 34 | + * @since 1.5 | |
| 35 | + */ | |
| 36 | +public 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 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 | +} | |