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 align(String s, int width)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 */ toAlignment(String s)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 */ keySet()113 public static Set<String> keySet() { 114 return map.keySet(); 115 } 116 toString()117 public String toString() { 118 return name; 119 } 120 Alignment(String name)121 private Alignment(String name) { 122 this.name = name; 123 map.put(name, this); 124 } 125 } 126