/*

 * Copyright (c) 2008, 2013, 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 com.sun.beans.util.Cache;

import java.lang.reflect.Constructor;

import java.lang.reflect.Modifier;

import static com.sun.beans.util.Cache.Kind.SOFT;

import static sun.reflect.misc.ReflectUtil.isPackageAccessible;

/**

 * This utility class provides {@code static} methods

 * to find a public constructor with specified parameter types

 * in specified class.

 *

 * @since 1.7

 *

 * @author Sergey A. Malenkov

 */

public final class ConstructorFinder extends AbstractFinder<Constructor<?>> {

    private static final Cache<Signature, Constructor<?>> CACHE = new Cache<Signature, Constructor<?>>(SOFT, SOFT) {

        @Override

        public Constructor create(Signature signature) {

            try {

                ConstructorFinder finder = new ConstructorFinder(signature.getArgs());

                return finder.find(signature.getType().getConstructors());

            }

            catch (Exception exception) {

                throw new SignatureException(exception);

            }

        }

    };

    /**

     * Finds public constructor

     * that is declared in public class.

     *

     * @param type  the class that can have constructor

     * @param args  parameter types that is used to find constructor

     * @return object that represents found constructor

     * @throws NoSuchMethodException if constructor could not be found

     *                               or some constructors are found

     */

    public static Constructor<?> findConstructor(Class<?> type, Class<?>...args) throws NoSuchMethodException {

        if (type.isPrimitive()) {

            throw new NoSuchMethodException("Primitive wrapper does not contain constructors");

        }

        if (type.isInterface()) {

            throw new NoSuchMethodException("Interface does not contain constructors");

        }

        if (Modifier.isAbstract(type.getModifiers())) {

            throw new NoSuchMethodException("Abstract class cannot be instantiated");

        }

        if (!Modifier.isPublic(type.getModifiers()) || !isPackageAccessible(type)) {

            throw new NoSuchMethodException("Class is not accessible");

        }

        PrimitiveWrapperMap.replacePrimitivesWithWrappers(args);

        Signature signature = new Signature(type, args);

        try {

            return CACHE.get(signature);

        }

        catch (SignatureException exception) {

            throw exception.toNoSuchMethodException("Constructor is not found");

        }

    }

    /**

     * Creates constructor finder with specified array of parameter types.

     *

     * @param args  the array of parameter types

     */

    private ConstructorFinder(Class<?>[] args) {

        super(args);

    }

}