103 lines
3.8 KiB
Java
103 lines
3.8 KiB
Java
/*
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* Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.beans.finder;
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import java.beans.BeanDescriptor;
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import java.beans.BeanInfo;
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import java.beans.MethodDescriptor;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Method;
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/**
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* This is utility class that provides functionality
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* to find a {@link BeanInfo} for a JavaBean specified by its type.
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*
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* @since 1.7
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*
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* @author Sergey A. Malenkov
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*/
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public final class BeanInfoFinder
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extends InstanceFinder<BeanInfo> {
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private static final String DEFAULT = "sun.beans.infos";
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private static final String DEFAULT_NEW = "com.sun.beans.infos";
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public BeanInfoFinder() {
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super(BeanInfo.class, true, "BeanInfo", DEFAULT);
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}
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private static boolean isValid(Class<?> type, Method method) {
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return (method != null) && method.getDeclaringClass().isAssignableFrom(type);
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}
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@Override
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protected BeanInfo instantiate(Class<?> type, String prefix, String name) {
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if (DEFAULT.equals(prefix)) {
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prefix = DEFAULT_NEW;
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}
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// this optimization will only use the BeanInfo search path
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// if is has changed from the original
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// or trying to get the ComponentBeanInfo
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BeanInfo info = !DEFAULT_NEW.equals(prefix) || "ComponentBeanInfo".equals(name)
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? super.instantiate(type, prefix, name)
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: null;
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if (info != null) {
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// make sure that the returned BeanInfo matches the class
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BeanDescriptor bd = info.getBeanDescriptor();
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if (bd != null) {
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if (type.equals(bd.getBeanClass())) {
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return info;
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}
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}
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else {
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PropertyDescriptor[] pds = info.getPropertyDescriptors();
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if (pds != null) {
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for (PropertyDescriptor pd : pds) {
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Method method = pd.getReadMethod();
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if (method == null) {
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method = pd.getWriteMethod();
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}
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if (isValid(type, method)) {
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return info;
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}
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}
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}
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else {
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MethodDescriptor[] mds = info.getMethodDescriptors();
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if (mds != null) {
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for (MethodDescriptor md : mds) {
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if (isValid(type, md.getMethod())) {
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return info;
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}
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}
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}
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}
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}
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}
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return null;
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}
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}
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