110 lines
3.5 KiB
Java
110 lines
3.5 KiB
Java
/*
|
|
* Copyright (c) 2009, 2010, 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;
|
|
}
|
|
|
|
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)) {
|
|
return (T) type.newInstance();
|
|
}
|
|
}
|
|
catch (Exception exception) {
|
|
// ignore any exceptions
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
protected T instantiate(Class<?> type, String prefix, String name) {
|
|
return instantiate(type, prefix + '.' + name);
|
|
}
|
|
}
|