| /* |
| * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.beans.finder; |
| |
| /** |
| * This is utility class that provides basic functionality |
| * to find an auxiliary class for a JavaBean specified by its type. |
| * |
| * @since 1.7 |
| * |
| * @author Sergey A. Malenkov |
| */ |
| class InstanceFinder<T> { |
| |
| private static final String[] EMPTY = { }; |
| |
| private final Class<? extends T> type; |
| private final boolean allow; |
| private final String suffix; |
| private volatile String[] packages; |
| |
| InstanceFinder(Class<? extends T> type, boolean allow, String suffix, String... packages) { |
| this.type = type; |
| this.allow = allow; |
| this.suffix = suffix; |
| this.packages = packages.clone(); |
| } |
| |
| public String[] getPackages() { |
| return this.packages.clone(); |
| } |
| |
| public void setPackages(String... packages) { |
| this.packages = (packages != null) && (packages.length > 0) |
| ? packages.clone() |
| : EMPTY; |
| } |
| |
| public T find(Class<?> type) { |
| if (type == null) { |
| return null; |
| } |
| String name = type.getName() + this.suffix; |
| T object = instantiate(type, name); |
| if (object != null) { |
| return object; |
| } |
| if (this.allow) { |
| object = instantiate(type, null); |
| if (object != null) { |
| return object; |
| } |
| } |
| int index = name.lastIndexOf('.') + 1; |
| if (index > 0) { |
| name = name.substring(index); |
| } |
| for (String prefix : this.packages) { |
| object = instantiate(type, prefix, name); |
| if (object != null) { |
| return object; |
| } |
| } |
| return null; |
| } |
| |
| @SuppressWarnings("deprecation") |
| protected T instantiate(Class<?> type, String name) { |
| if (type != null) { |
| try { |
| if (name != null) { |
| type = ClassFinder.findClass(name, type.getClassLoader()); |
| } |
| if (this.type.isAssignableFrom(type)) { |
| @SuppressWarnings("unchecked") |
| T tmp = (T) type.newInstance(); |
| return tmp; |
| } |
| } |
| catch (Exception exception) { |
| // ignore any exceptions |
| } |
| } |
| return null; |
| } |
| |
| protected T instantiate(Class<?> type, String prefix, String name) { |
| return instantiate(type, prefix + '.' + name); |
| } |
| } |