Source for javax.accessibility.AccessibleRelation

   1: /* AccessibleRelation.java -- the relation between accessible objects
   2:    Copyright (C) 2002, 2005 Free Software Foundation
   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.accessibility;
  39: 
  40: import java.util.Locale;
  41: 
  42: /**
  43:  * The relation between one accessible object and one or more other objects.
  44:  * For example, a button may control an action. An AccessibleRelationSet
  45:  * summarizes all relations of the object. This strongly typed "enumeration"
  46:  * supports localized strings. If the constants of this class are not
  47:  * adequate, new ones may be added in a similar matter.
  48:  * 
  49:  * @author Eric Blake (ebb9@email.byu.edu)
  50:  * @since 1.2
  51:  * @status updated to 1.4
  52:  */
  53: public class AccessibleRelation extends AccessibleBundle
  54: {
  55:   /**
  56:    * Indicates the object labels other objects.
  57:    *
  58:    * @see #getTarget()
  59:    * @see #CONTROLLER_FOR
  60:    * @see #CONTROLLED_BY
  61:    * @see #LABELED_BY
  62:    * @see #MEMBER_OF
  63:    */
  64:   public static final String LABEL_FOR;
  65: 
  66:   /**
  67:    * Indicates the object is labeled by other objects.
  68:    *
  69:    * @see #getTarget()
  70:    * @see #CONTROLLER_FOR
  71:    * @see #CONTROLLED_BY
  72:    * @see #LABEL_FOR
  73:    * @see #MEMBER_OF
  74:    */
  75:   public static final String LABELED_BY;
  76: 
  77:   /**
  78:    * Indicates an object is a member of a group of target objects.
  79:    *
  80:    * @see #getTarget()
  81:    * @see #CONTROLLER_FOR
  82:    * @see #CONTROLLED_BY
  83:    * @see #LABEL_FOR
  84:    * @see #LABELED_BY
  85:    */
  86:   public static final String MEMBER_OF;
  87: 
  88:   /**
  89:    * Indicates an object is a controller for other objects.
  90:    *
  91:    * @see #getTarget()
  92:    * @see #CONTROLLED_BY
  93:    * @see #LABEL_FOR
  94:    * @see #LABELED_BY
  95:    * @see #MEMBER_OF
  96:    */
  97:   public static final String CONTROLLER_FOR;
  98: 
  99:   /**
 100:    * Indicates an object is controlled by other objects.
 101:    *
 102:    * @see #getTarget()
 103:    * @see #CONTROLLER_FOR
 104:    * @see #LABEL_FOR
 105:    * @see #LABELED_BY
 106:    * @see #MEMBER_OF
 107:    */
 108:   public static final String CONTROLLED_BY;
 109: 
 110:   /** Indicates that the label target group has changed. */
 111:   public static final String LABEL_FOR_PROPERTY = "labelForProperty";
 112: 
 113:   /** Indicates that the labelling objects have changed. */
 114:   public static final String LABELED_BY_PROPERTY = "labeledByProperty";
 115: 
 116:   /** Indicates that group membership has changed. */
 117:   public static final String MEMBER_OF_PROPERTY = "memberOfProperty";
 118: 
 119:   /** Indicates that the controller target group has changed. */
 120:   public static final String CONTROLLER_FOR_PROPERTY = "controllerForProperty";
 121: 
 122:   /** Indicates that the controlling objects have changed. */
 123:   public static final String CONTROLLED_BY_PROPERTY = "controlledByProperty";
 124: 
 125:   /**
 126:    * Indicates that an object is a child of another object.
 127:    * @since 1.5
 128:    */
 129:   public static final String CHILD_NODE_OF = "childNodeOf";
 130: 
 131:   /**
 132:    * Indicates that the ancestry relationship has changed.
 133:    * @since 1.5
 134:    */
 135:   public static final String CHILD_NODE_OF_PROPERTY = "childNodeOfProperty";
 136: 
 137:   /**
 138:    * Indicates that an object is embedded by another object.
 139:    * @since 1.5
 140:    */
 141:   public static final String EMBEDDED_BY = "embeddedBy";
 142: 
 143:   /**
 144:    * Indicates that the {@link #EMBEDDED_BY} property changed.
 145:    * @since 1.5
 146:    */
 147:   public static final String EMBEDDED_BY_PROPERTY = "embeddedByProperty";
 148: 
 149:   /**
 150:    * Indicates that an object embeds another object.
 151:    * @since 1.5
 152:    */
 153:   public static final String EMBEDS = "embeds";
 154: 
 155:   /**
 156:    * Indicates that the {@link #EMBEDS} property changed.
 157:    * @since 1.5
 158:    */
 159:   public static final String EMBEDS_PROPERTY = "embedsProperty";
 160: 
 161:   /**
 162:    * Indicates that one object directly follows another object,
 163:    * as in a paragraph flow.
 164:    * @since 1.5
 165:    */
 166:   public static final String FLOWS_FROM = "flowsFrom";
 167: 
 168:   /**
 169:    * Indicates that the {@link #FLOWS_FROM} property changed.
 170:    * @since 1.5
 171:    */
 172:   public static final String FLOWS_FROM_PROPERTY = "flowsFromProperty";
 173: 
 174:   /**
 175:    * Indicates that one object comes directly before another object,
 176:    * as in a paragraph flow.
 177:    * @since 1.5
 178:    */
 179:   public static final String FLOWS_TO = "flowsTo";
 180: 
 181:   /**
 182:    * Indicates that the {@link #FLOWS_TO} property changed.
 183:    * @since 1.5
 184:    */
 185:   public static final String FLOWS_TO_PROPERTY = "flowsToProperty";
 186: 
 187:   /**
 188:    * Indicates that one object is a parent window of another object.
 189:    * @since 1.5
 190:    */
 191:   public static final String PARENT_WINDOW_OF = "parentWindowOf";
 192: 
 193:   /**
 194:    * Indicates that the {@link #PARENT_WINDOW_OF} property changed.
 195:    * @since 1.5
 196:    */
 197:   public static final String PARENT_WINDOW_OF_PROPERTY = "parentWindowOfProperty";
 198: 
 199:   /**
 200:    * Indicates that one object is a subwindow of another object.
 201:    * @since 1.5
 202:    */
 203:   public static final String SUBWINDOW_OF = "subwindowOf";
 204: 
 205:   /**
 206:    * Indicates that the {@link #SUBWINDOW_OF} property changed.
 207:    * @since 1.5
 208:    */
 209:   public static final String SUBWINDOW_OF_PROPERTY = "subwindowOfProperty";
 210: 
 211:   /** An empty set of targets. */
 212:   private static final Object[] EMPTY_TARGETS = { };
 213:   
 214:   static
 215:     {
 216:       // not constants in JDK
 217:       LABEL_FOR = "labelFor";
 218:       LABELED_BY = "labeledBy";
 219:       MEMBER_OF = "memberOf";
 220:       CONTROLLER_FOR = "controllerFor";
 221:       CONTROLLED_BY = "controlledBy";
 222:     }
 223: 
 224:   /**
 225:    * The related objects.
 226:    *
 227:    * @see #getTarget()
 228:    * @see #setTarget(Object)
 229:    * @see #setTarget(Object[])
 230:    */
 231:   Object[] targets;
 232: 
 233:   /**
 234:    * Create a new relation with a locale independent key, and no related
 235:    * objects.
 236:    *
 237:    * @param key the name of the role
 238:    * @see #toDisplayString(String, Locale)
 239:    */
 240:   public AccessibleRelation(String key)
 241:   {
 242:     this.key = key;
 243:     targets = EMPTY_TARGETS;
 244:   }
 245: 
 246:   /**
 247:    * Create a new relation with a locale independent key, and a single related
 248:    * object.
 249:    *
 250:    * @param key the name of the role
 251:    * @param target the related object
 252:    * @see #toDisplayString(String, Locale)
 253:    */
 254:   public AccessibleRelation(String key, Object target)
 255:   {
 256:     this.key = key;
 257:     targets = new Object[] { target };
 258:   }
 259: 
 260:   /**
 261:    * Create a new relation with a locale independent key, and the given
 262:    * related objects.
 263:    *
 264:    * @param key the name of the role
 265:    * @param targets the related objects
 266:    * @see #toDisplayString(String, Locale)
 267:    */
 268:   public AccessibleRelation(String key, Object[] targets)
 269:   {
 270:     this.key = key;
 271:     this.targets = targets == null ? EMPTY_TARGETS : targets;
 272:   }
 273: 
 274:   /**
 275:    * Return the key for this relation.
 276:    *
 277:    * @return the key
 278:    * @see #CONTROLLER_FOR
 279:    * @see #CONTROLLED_BY
 280:    * @see #LABEL_FOR
 281:    * @see #LABELED_BY
 282:    * @see #MEMBER_OF
 283:    */
 284:   public String getKey()
 285:   {
 286:     return key;
 287:   }
 288: 
 289:   /**
 290:    * Return the targets of this relation.
 291:    *
 292:    * @return the targets, may be empty, but never null
 293:    */
 294:   public Object[] getTarget()
 295:   {
 296:     return targets;
 297:   }
 298: 
 299:   /**
 300:    * Set the target to a single object.
 301:    *
 302:    * @param target the new target
 303:    */
 304:   public void setTarget(Object target)
 305:   {
 306:     targets = new Object[] { target };
 307:   }
 308: 
 309:   /**
 310:    * Set the target to an array of objects.
 311:    *
 312:    * @param targets the new targets
 313:    */
 314:   public void setTarget(Object[] targets)
 315:   {
 316:     this.targets = targets == null ? EMPTY_TARGETS : targets;
 317:   }
 318: } // class AccessibleRelation