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/* * @(#)AccessibleRelationSet.java 1.15 06/04/07 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.accessibility; import java.util.Vector; import java.util.Locale; import java.util.MissingResourceException; import java.util.ResourceBundle; /** * Class AccessibleRelationSet determines a component's relation set. The * relation set of a component is a set of AccessibleRelation objects that * describe the component's relationships with other components. * * @see AccessibleRelation * * @version 1.15 04/07/06 * @author Lynn Monsanto * @since 1.3 */ public class AccessibleRelationSet { /** * Each entry in the Vector represents an AccessibleRelation. * @see #add * @see #addAll * @see #remove * @see #contains * @see #get * @see #size * @see #toArray * @see #clear */ protected Vector<AccessibleRelation> relations = null; /** * Creates a new empty relation set. */ public AccessibleRelationSet() { relations = null; } /** * Creates a new relation with the initial set of relations contained in * the array of relations passed in. Duplicate entries are ignored. * * @param relations an array of AccessibleRelation describing the * relation set. */ public AccessibleRelationSet(AccessibleRelation[] relations) { if (relations.length != 0) { this.relations = new Vector(relations.length); for (int i = 0; i < relations.length; i++) { add(relations[i]); } } } /** * Adds a new relation to the current relation set. If the relation * is already in the relation set, the target(s) of the specified * relation is merged with the target(s) of the existing relation. * Otherwise, the new relation is added to the relation set. * * @param relation the relation to add to the relation set * @return true if relation is added to the relation set; false if the * relation set is unchanged */ public boolean add(AccessibleRelation relation) { if (relations == null) { relations = new Vector(); } // Merge the relation targets if the key exists AccessibleRelation existingRelation = get(relation.getKey()); if (existingRelation == null) { relations.addElement(relation); return true; } else { Object [] existingTarget = existingRelation.getTarget(); Object [] newTarget = relation.getTarget(); int mergedLength = existingTarget.length + newTarget.length; Object [] mergedTarget = new Object[mergedLength]; for (int i = 0; i < existingTarget.length; i++) { mergedTarget[i] = existingTarget[i]; } for (int i = existingTarget.length, j = 0; i < mergedLength; i++, j++) { mergedTarget[i] = newTarget[j]; } existingRelation.setTarget(mergedTarget); } return true; } /** * Adds all of the relations to the existing relation set. Duplicate * entries are ignored. * * @param relations AccessibleRelation array describing the relation set. */ public void addAll(AccessibleRelation[] relations) { if (relations.length != 0) { if (this.relations == null) { this.relations = new Vector(relations.length); } for (int i = 0; i < relations.length; i++) { add(relations[i]); } } } /** * Removes a relation from the current relation set. If the relation * is not in the set, the relation set will be unchanged and the * return value will be false. If the relation is in the relation * set, it will be removed from the set and the return value will be * true. * * @param relation the relation to remove from the relation set * @return true if the relation is in the relation set; false if the * relation set is unchanged */ public boolean remove(AccessibleRelation relation) { if (relations == null) { return false; } else { return relations.removeElement(relation); } } /** * Removes all the relations from the current relation set. */ public void clear() { if (relations != null) { relations.removeAllElements(); } } /** * Returns the number of relations in the relation set. */ public int size() { if (relations == null) { return 0; } else { return relations.size(); } } /** * Returns whether the relation set contains a relation * that matches the specified key. * @param key the AccessibleRelation key * @return true if the relation is in the relation set; otherwise false */ public boolean contains(String key) { return get(key) != null; } /** * Returns the relation that matches the specified key. * @param key the AccessibleRelation key * @return the relation, if one exists, that matches the specified key. * Otherwise, null is returned. */ public AccessibleRelation get(String key) { if (relations == null) { return null; } else { int len = relations.size(); for (int i = 0; i < len; i++) { AccessibleRelation relation = (AccessibleRelation)relations.elementAt(i); if (relation != null && relation.getKey().equals(key)) { return relation; } } return null; } } /** * Returns the current relation set as an array of AccessibleRelation * @return AccessibleRelation array contacting the current relation. */ public AccessibleRelation[] toArray() { if (relations == null) { return new AccessibleRelation[0]; } else { AccessibleRelation[] relationArray = new AccessibleRelation[relations.size()]; for (int i = 0; i < relationArray.length; i++) { relationArray[i] = (AccessibleRelation) relations.elementAt(i); } return relationArray; } } /** * Creates a localized String representing all the relations in the set * using the default locale. * * @return comma separated localized String * @see AccessibleBundle#toDisplayString */ public String toString() { String ret = ""; if ((relations != null) && (relations.size() > 0)) { ret = ((AccessibleRelation) (relations.elementAt(0))).toDisplayString(); for (int i = 1; i < relations.size(); i++) { ret = ret + "," + ((AccessibleRelation) (relations.elementAt(i))). toDisplayString(); } } return ret; } }