1 /* TabSet.java -- 2 Copyright (C) 2004, 2006, Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package javax.swing.text; 39 40 import gnu.java.lang.CPStringBuilder; 41 42 import java.io.Serializable; 43 44 /** 45 * A set of tab stops. Instances of this class are immutable. 46 */ 47 public class TabSet implements Serializable 48 { 49 /** The serialization UID (compatible with JDK1.5). */ 50 private static final long serialVersionUID = 2367703481999080593L; 51 52 /** Storage for the tab stops. */ 53 TabStop[] tabs; 54 55 /** 56 * Creates a new <code>TabSet</code> containing the specified tab stops. 57 * 58 * @param t the tab stops (<code>null</code> permitted). 59 */ TabSet(TabStop[] t)60 public TabSet(TabStop[] t) 61 { 62 if (t != null) 63 tabs = (TabStop[]) t.clone(); 64 else 65 tabs = new TabStop[0]; 66 } 67 68 /** 69 * Returns the tab stop with the specified index. 70 * 71 * @param i the index. 72 * 73 * @return The tab stop. 74 * 75 * @throws IllegalArgumentException if <code>i</code> is not in the range 76 * <code>0</code> to <code>getTabCount() - 1</code>. 77 */ getTab(int i)78 public TabStop getTab(int i) 79 { 80 if (i < 0 || i >= tabs.length) 81 throw new IllegalArgumentException("Index out of bounds."); 82 return tabs[i]; 83 } 84 85 /** 86 * Returns the tab following the specified location. 87 * 88 * @param location the location. 89 * 90 * @return The tab following the specified location (or <code>null</code>). 91 */ getTabAfter(float location)92 public TabStop getTabAfter(float location) 93 { 94 int idx = getTabIndexAfter(location); 95 if (idx == -1) 96 return null; 97 else 98 return tabs[idx]; 99 } 100 101 /** 102 * Returns the number of tab stops in this tab set. 103 * 104 * @return The number of tab stops in this tab set. 105 */ getTabCount()106 public int getTabCount() 107 { 108 return tabs.length; 109 } 110 111 /** 112 * Returns the index of the specified tab, or -1 if the tab is not found. 113 * 114 * @param tab the tab (<code>null</code> permitted). 115 * 116 * @return The index of the specified tab, or -1. 117 */ getTabIndex(TabStop tab)118 public int getTabIndex(TabStop tab) 119 { 120 for (int i = 0; i < tabs.length; ++i) 121 if (tabs[i] == tab) 122 return i; 123 return -1; 124 } 125 126 /** 127 * Returns the index of the tab at or after the specified location. 128 * 129 * @param location the tab location. 130 * 131 * @return The index of the tab stop, or -1. 132 */ getTabIndexAfter(float location)133 public int getTabIndexAfter(float location) 134 { 135 for (int i = 0; i < tabs.length; i++) 136 { 137 if (location <= tabs[i].getPosition()) 138 return i; 139 } 140 return -1; 141 } 142 143 /** 144 * Tests this <code>TabSet</code> for equality with an arbitrary object. 145 * 146 * @param obj the object (<code>null</code> permitted). 147 * 148 * @return <code>true</code> if this <code>TabSet</code> is equal to 149 * <code>obj</code>, and <code>false</code> otherwise. 150 * 151 * @since 1.5 152 */ equals(Object obj)153 public boolean equals(Object obj) 154 { 155 if (obj == this) 156 return true; 157 if (!(obj instanceof TabSet)) 158 return false; 159 TabSet that = (TabSet) obj; 160 int tabCount = getTabCount(); 161 if (tabCount != that.getTabCount()) 162 return false; 163 for (int i = 0; i < tabCount; i++) 164 { 165 if (!this.getTab(i).equals(that.getTab(i))) 166 return false; 167 } 168 return true; 169 } 170 171 /** 172 * Returns a hash code for this <code>TabSet</code>. 173 * 174 * @return A hash code. 175 * 176 * @since 1.5 177 */ hashCode()178 public int hashCode() 179 { 180 // this hash code won't match Sun's, but that shouldn't matter... 181 int result = 193; 182 int tabs = getTabCount(); 183 for (int i = 0; i < tabs; i++) 184 { 185 TabStop t = getTab(i); 186 if (t != null) 187 result = 37 * result + t.hashCode(); 188 } 189 return result; 190 } 191 192 /** 193 * Returns a string representation of this <code>TabSet</code>. 194 * 195 * @return A string representation of this <code>TabSet</code>. 196 */ toString()197 public String toString() 198 { 199 CPStringBuilder sb = new CPStringBuilder(); 200 sb.append("[ "); 201 for (int i = 0; i < tabs.length; ++i) 202 { 203 if (i != 0) 204 sb.append(" - "); 205 sb.append(tabs[i].toString()); 206 } 207 sb.append(" ]"); 208 return sb.toString(); 209 } 210 } 211