/*

 * Copyright (c) 2009, 2012, 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;

import java.beans.BeanDescriptor;

import java.beans.BeanInfo;

import java.beans.MethodDescriptor;

import java.beans.PropertyDescriptor;

import java.lang.reflect.Method;

/**

 * This is utility class that provides functionality

 * to find a {@link BeanInfo} for a JavaBean specified by its type.

 *

 * @since 1.7

 *

 * @author Sergey A. Malenkov

 */

public final class BeanInfoFinder

        extends InstanceFinder<BeanInfo> {

    private static final String DEFAULT = "sun.beans.infos";

    private static final String DEFAULT_NEW = "com.sun.beans.infos";

    public BeanInfoFinder() {

        super(BeanInfo.class, true, "BeanInfo", DEFAULT);

    }

    private static boolean isValid(Class<?> type, Method method) {

        return (method != null) && method.getDeclaringClass().isAssignableFrom(type);

    }

    @Override

    protected BeanInfo instantiate(Class<?> type, String prefix, String name) {

        if (DEFAULT.equals(prefix)) {

            prefix = DEFAULT_NEW;

        }

        // this optimization will only use the BeanInfo search path

        // if is has changed from the original

        // or trying to get the ComponentBeanInfo

        BeanInfo info = !DEFAULT_NEW.equals(prefix) || "ComponentBeanInfo".equals(name)

                ? super.instantiate(type, prefix, name)

                : null;

        if (info != null) {

            // make sure that the returned BeanInfo matches the class

            BeanDescriptor bd = info.getBeanDescriptor();

            if (bd != null) {

                if (type.equals(bd.getBeanClass())) {

                    return info;

                }

            }

            else {

                PropertyDescriptor[] pds = info.getPropertyDescriptors();

                if (pds != null) {

                    for (PropertyDescriptor pd : pds) {

                        Method method = pd.getReadMethod();

                        if (method == null) {

                            method = pd.getWriteMethod();

                        }

                        if (isValid(type, method)) {

                            return info;

                        }

                    }

                }

                else {

                    MethodDescriptor[] mds = info.getMethodDescriptors();

                    if (mds != null) {

                        for (MethodDescriptor md : mds) {

                            if (isValid(type, md.getMethod())) {

                                return info;

                            }

                        }

                    }

                }

            }

        }

        return null;

    }

}