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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 | } | ||