101 lines
3.8 KiB
Java
101 lines
3.8 KiB
Java
/*
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* Copyright (c) 2008, 2013, 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 com.sun.beans.util.Cache;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Modifier;
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import static com.sun.beans.util.Cache.Kind.SOFT;
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import static sun.reflect.misc.ReflectUtil.isPackageAccessible;
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/**
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* This utility class provides {@code static} methods
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* to find a public constructor with specified parameter types
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* in specified class.
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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 ConstructorFinder extends AbstractFinder<Constructor<?>> {
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private static final Cache<Signature, Constructor<?>> CACHE = new Cache<Signature, Constructor<?>>(SOFT, SOFT) {
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@Override
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public Constructor create(Signature signature) {
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try {
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ConstructorFinder finder = new ConstructorFinder(signature.getArgs());
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return finder.find(signature.getType().getConstructors());
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}
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catch (Exception exception) {
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throw new SignatureException(exception);
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}
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}
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};
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/**
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* Finds public constructor
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* that is declared in public class.
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*
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* @param type the class that can have constructor
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* @param args parameter types that is used to find constructor
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* @return object that represents found constructor
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* @throws NoSuchMethodException if constructor could not be found
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* or some constructors are found
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*/
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public static Constructor<?> findConstructor(Class<?> type, Class<?>...args) throws NoSuchMethodException {
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if (type.isPrimitive()) {
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throw new NoSuchMethodException("Primitive wrapper does not contain constructors");
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}
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if (type.isInterface()) {
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throw new NoSuchMethodException("Interface does not contain constructors");
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}
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if (Modifier.isAbstract(type.getModifiers())) {
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throw new NoSuchMethodException("Abstract class cannot be instantiated");
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}
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if (!Modifier.isPublic(type.getModifiers()) || !isPackageAccessible(type)) {
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throw new NoSuchMethodException("Class is not accessible");
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}
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PrimitiveWrapperMap.replacePrimitivesWithWrappers(args);
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Signature signature = new Signature(type, args);
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try {
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return CACHE.get(signature);
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}
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catch (SignatureException exception) {
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throw exception.toNoSuchMethodException("Constructor is not found");
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}
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}
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/**
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* Creates constructor finder with specified array of parameter types.
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*
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* @param args the array of parameter types
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*/
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private ConstructorFinder(Class<?>[] args) {
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super(args);
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}
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}
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