1.1 --- a/lookup/src/main/java/org/openide/util/lookup/SingletonLookup.java Wed Jan 27 17:46:23 2010 -0500
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,173 +0,0 @@
1.4 -/*
1.5 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
1.6 - *
1.7 - * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
1.8 - *
1.9 - * The contents of this file are subject to the terms of either the GNU
1.10 - * General Public License Version 2 only ("GPL") or the Common
1.11 - * Development and Distribution License("CDDL") (collectively, the
1.12 - * "License"). You may not use this file except in compliance with the
1.13 - * License. You can obtain a copy of the License at
1.14 - * http://www.netbeans.org/cddl-gplv2.html
1.15 - * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
1.16 - * specific language governing permissions and limitations under the
1.17 - * License. When distributing the software, include this License Header
1.18 - * Notice in each file and include the License file at
1.19 - * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
1.20 - * particular file as subject to the "Classpath" exception as provided
1.21 - * by Sun in the GPL Version 2 section of the License file that
1.22 - * accompanied this code. If applicable, add the following below the
1.23 - * License Header, with the fields enclosed by brackets [] replaced by
1.24 - * your own identifying information:
1.25 - * "Portions Copyrighted [year] [name of copyright owner]"
1.26 - *
1.27 - * If you wish your version of this file to be governed by only the CDDL
1.28 - * or only the GPL Version 2, indicate your decision by adding
1.29 - * "[Contributor] elects to include this software in this distribution
1.30 - * under the [CDDL or GPL Version 2] license." If you do not indicate a
1.31 - * single choice of license, a recipient has the option to distribute
1.32 - * your version of this file under either the CDDL, the GPL Version 2 or
1.33 - * to extend the choice of license to its licensees as provided above.
1.34 - * However, if you add GPL Version 2 code and therefore, elected the GPL
1.35 - * Version 2 license, then the option applies only if the new code is
1.36 - * made subject to such option by the copyright holder.
1.37 - *
1.38 - * Contributor(s):
1.39 - *
1.40 - * Portions Copyrighted 2008 Sun Microsystems, Inc.
1.41 - */
1.42 -
1.43 -package org.openide.util.lookup;
1.44 -
1.45 -import java.util.Collection;
1.46 -import java.util.Collections;
1.47 -import java.util.Set;
1.48 -import org.openide.util.Lookup;
1.49 -import org.openide.util.LookupListener;
1.50 -
1.51 -/**
1.52 - * Unmodifiable lookup that contains just one fixed object.
1.53 - *
1.54 - * @author Marian Petras
1.55 - */
1.56 -class SingletonLookup extends Lookup {
1.57 -
1.58 - private final Object objectToLookup;
1.59 - private final String id;
1.60 -
1.61 - SingletonLookup(Object objectToLookup) {
1.62 - this(objectToLookup, null);
1.63 - }
1.64 -
1.65 - SingletonLookup(Object objectToLookup, String id) {
1.66 - if (objectToLookup == null) {
1.67 - throw new IllegalArgumentException("null"); //NOI18N
1.68 - }
1.69 -
1.70 - this.objectToLookup = objectToLookup;
1.71 - this.id = id;
1.72 - }
1.73 -
1.74 - @Override
1.75 - public <T> T lookup(Class<T> clazz) {
1.76 - if (clazz == null) {
1.77 - throw new IllegalArgumentException("null"); //NOI18N
1.78 - }
1.79 -
1.80 - return (clazz.isInstance(objectToLookup))
1.81 - ? clazz.cast(objectToLookup)
1.82 - : null;
1.83 - }
1.84 -
1.85 - @Override
1.86 - public <T> Result<T> lookup(Template<T> template) {
1.87 - if (template == null) {
1.88 - throw new IllegalArgumentException("null"); //NOI18N
1.89 - }
1.90 -
1.91 - Lookup.Item<T> item = lookupItem(template);
1.92 - if (item != null) {
1.93 - return new SingletonResult<T>(item);
1.94 - } else {
1.95 - return Lookup.EMPTY.lookup(template);
1.96 - }
1.97 - }
1.98 -
1.99 - @Override
1.100 - public <T> Collection<? extends T> lookupAll(Class<T> clazz) {
1.101 - if (clazz == null) {
1.102 - throw new IllegalArgumentException("null"); //NOI18N
1.103 - }
1.104 -
1.105 - return (clazz.isInstance(objectToLookup))
1.106 - ? Collections.singletonList(clazz.cast(objectToLookup))
1.107 - : Collections.<T>emptyList();
1.108 - }
1.109 -
1.110 - @Override
1.111 - @SuppressWarnings("unchecked")
1.112 - public <T> Item<T> lookupItem(Template<T> template) {
1.113 - if (template == null) {
1.114 - throw new IllegalArgumentException("null"); //NOI18N
1.115 - }
1.116 -
1.117 - String templateId = template.getId();
1.118 - if ((templateId != null) && !templateId.equals(id)) {
1.119 - return null;
1.120 - }
1.121 -
1.122 - Object templateInst = template.getInstance();
1.123 - if ((templateInst != null) && (objectToLookup != templateInst)) {
1.124 - return null;
1.125 - }
1.126 -
1.127 - Class<T> clazz = template.getType();
1.128 - if ((clazz != null) && !clazz.isInstance(objectToLookup)) {
1.129 - return null;
1.130 - }
1.131 -
1.132 - Lookup.Item<T> item;
1.133 - if (clazz != null) {
1.134 - item = Lookups.lookupItem(clazz.cast(objectToLookup), id);
1.135 - } else {
1.136 - item = Lookups.lookupItem((T) objectToLookup, id);
1.137 - }
1.138 - return item;
1.139 - }
1.140 -
1.141 - static class SingletonResult<T> extends Lookup.Result<T> {
1.142 -
1.143 - private final Lookup.Item<T> item;
1.144 -
1.145 - SingletonResult(Lookup.Item<T> item) {
1.146 - this.item = item;
1.147 - }
1.148 -
1.149 - @Override
1.150 - public void addLookupListener(LookupListener l) {
1.151 - // this result never changes - no need to register a listener
1.152 - }
1.153 -
1.154 - @Override
1.155 - public void removeLookupListener(LookupListener l) {
1.156 - // this result never changes - no need to register a listener
1.157 - }
1.158 -
1.159 - @Override
1.160 - public Set<Class<? extends T>> allClasses() {
1.161 - return Collections.<Class<? extends T>>singleton(item.getType());
1.162 - }
1.163 -
1.164 - @Override
1.165 - public Collection<? extends Item<T>> allItems() {
1.166 - return Collections.singletonList(item);
1.167 - }
1.168 -
1.169 - @Override
1.170 - public Collection<? extends T> allInstances() {
1.171 - return Collections.singletonList(item.getInstance());
1.172 - }
1.173 -
1.174 - }
1.175 -
1.176 -}