2 * Copyright 2007 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.system.core;
18 import org.wamblee.reflection.ReflectionUtils;
20 import java.util.Arrays;
29 public class DefaultRequiredInterface implements RequiredInterface {
38 private boolean optional;
43 private Class[] required;
48 private ProvidedInterface provider;
51 * Creates a new DefaultRequiredInterface object.
53 * @param aName DOCUMENT ME!
54 * @param aInterface DOCUMENT ME!
56 public DefaultRequiredInterface(String aName, Class aInterface) {
57 this(aName, new Class[] { aInterface });
61 * Creates a new DefaultRequiredInterface object.
63 * @param aName DOCUMENT ME!
64 * @param aInterfaces DOCUMENT ME!
66 public DefaultRequiredInterface(String aName, Class[] aInterfaces) {
67 this(aName, aInterfaces, false);
71 * Creates a new DefaultRequiredInterface object.
73 * @param aName DOCUMENT ME!
74 * @param aInterface DOCUMENT ME!
75 * @param aIsOptional DOCUMENT ME!
77 public DefaultRequiredInterface(String aName, Class aInterface,
78 boolean aIsOptional) {
79 this(aName, new Class[] { aInterface }, aIsOptional);
83 * Creates a new DefaultRequiredInterface object.
85 * @param aName DOCUMENT ME!
86 * @param aInterfaces DOCUMENT ME!
87 * @param aIsOptional DOCUMENT ME!
89 public DefaultRequiredInterface(String aName, Class[] aInterfaces,
90 boolean aIsOptional) {
92 optional = aIsOptional;
93 required = aInterfaces;
99 * @return DOCUMENT ME!
102 public String getName() {
109 * @return DOCUMENT ME!
112 public boolean isOptional() {
119 * @param aDescriptor DOCUMENT ME!
121 * @return DOCUMENT ME!
124 public boolean implementedBy(ProvidedInterface aDescriptor) {
125 Class[] provided = aDescriptor.getInterfaceTypes();
127 for (Class requiredIntf : required) {
128 if (!serviceProvided(requiredIntf, provided)) {
133 // all required interfaces are provided.
138 * Check if the required interface is implemented by one of the
139 * provided interfaces.
141 * @param aRequired required interface
142 * @param aProvided Provided interfaces.
146 private boolean serviceProvided(Class aRequired, Class[] aProvided) {
147 for (Class provided : aProvided) {
149 provided = ReflectionUtils.wrapIfNeeded(provided);
150 aRequired = ReflectionUtils.wrapIfNeeded(aRequired);
151 provided.asSubclass(aRequired);
154 } catch (ClassCastException e) {
155 // No match, try the next one.
165 * @return DOCUMENT ME!
168 public ProvidedInterface getProvider() {
175 * @param aProvider DOCUMENT ME!
178 public void setProvider(ProvidedInterface aProvider) {
179 assert aProvider != null;
180 assert implementedBy(aProvider);
181 provider = aProvider;
187 * @param obj DOCUMENT ME!
189 * @return DOCUMENT ME!
192 public boolean equals(Object obj) {
199 * @param obj DOCUMENT ME!
201 * @return DOCUMENT ME!
204 public boolean covers(RequiredInterface obj) {
205 // TODO do more than equals.
206 if (!(obj instanceof DefaultRequiredInterface)) {
210 DefaultRequiredInterface descr = (DefaultRequiredInterface) obj;
212 if (required.length != descr.required.length) {
216 String[] interfaces1 = new String[required.length];
217 String[] interfaces2 = new String[required.length];
219 for (int i = 0; i < required.length; i++) {
220 interfaces1[i] = required[i].getName();
221 interfaces2[i] = descr.required[i].getName();
224 Arrays.sort(interfaces1);
225 Arrays.sort(interfaces2);
227 return Arrays.equals(interfaces1, interfaces2);
233 * @return DOCUMENT ME!
236 public int hashCode() {
237 return required.hashCode();
243 * @return DOCUMENT ME!
246 public String toString() {
247 StringBuffer buf = new StringBuffer();
248 buf.append("." + getName() + ":");
250 for (Class intf : required) {
251 buf.append("." + intf.getName());
254 return buf.toString();