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125 lines
4 KiB
Java
125 lines
4 KiB
Java
/*
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* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.tools.jstat;
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import java.util.*;
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/**
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* A typesafe enumeration for describing data alignment semantics
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*
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* @author Brian Doherty
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* @since 1.5
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*/
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public abstract class Alignment {
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private static int nextOrdinal = 0;
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private static HashMap<String, Alignment> map = new HashMap<String, Alignment>();
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private static final String blanks = " ";
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private final String name;
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private final int value = nextOrdinal++;
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protected abstract String align(String s, int width);
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/**
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* Alignment representing a Centered alignment
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*/
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public static final Alignment CENTER = new Alignment("center") {
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protected String align(String s, int width) {
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int length = s.length();
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if (length >= width) {
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return s;
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}
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int pad = width - length;
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int pad2 = pad / 2;
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int padr = pad % 2;
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if (pad2 == 0) {
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// only 0 or 1 character to pad
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return s + blanks.substring(0, padr);
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} else {
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// pad on both sides
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return blanks.substring(0, pad2) + s +
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blanks.substring(0, pad2 + padr);
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}
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}
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};
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/**
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* Alignment representing a Left alignment
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*/
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public static final Alignment LEFT = new Alignment("left") {
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protected String align(String s, int width) {
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int length = s.length();
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if (length >= width) {
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return s;
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}
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int pad = width - length;
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return s+blanks.substring(0, pad);
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}
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};
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/**
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* Alignment representing a Right alignment
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*/
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public static final Alignment RIGHT = new Alignment("right") {
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protected String align(String s, int width) {
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int length = s.length();
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if (length >= width) {
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return s;
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}
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int pad = width - length;
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return blanks.substring(0, pad) + s;
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}
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};
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/**
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* Maps a string value to its corresponding Alignment object.
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*
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* @param s an string to match against Alignment objects.
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* @return The Alignment object matching the given string.
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*/
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public static Alignment toAlignment(String s) {
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return map.get(s);
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}
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/**
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* Returns an enumeration of the keys for this enumerated type
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*
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* @return Set of Key Words for this enumeration.
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*/
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public static Set<String> keySet() {
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return map.keySet();
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}
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public String toString() {
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return name;
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}
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private Alignment(String name) {
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this.name = name;
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map.put(name, this);
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}
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}
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