| /* |
| * Copyright (c) 2009, 2015, 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * The MIT License |
| * |
| * Copyright (c) 2004-2015 Paul R. Holser, Jr. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| package jdk.internal.joptsimple.internal; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import static java.lang.reflect.Modifier.*; |
| |
| import jdk.internal.joptsimple.ValueConverter; |
| |
| import static jdk.internal.joptsimple.internal.Classes.*; |
| |
| /** |
| * Helper methods for reflection. |
| * |
| * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a> |
| */ |
| public final class Reflection { |
| private Reflection() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Finds an appropriate value converter for the given class. |
| * |
| * @param <V> a constraint on the class object to introspect |
| * @param clazz class to introspect on |
| * @return a converter method or constructor |
| */ |
| public static <V> ValueConverter<V> findConverter( Class<V> clazz ) { |
| Class<V> maybeWrapper = wrapperOf( clazz ); |
| |
| ValueConverter<V> valueOf = valueOfConverter( maybeWrapper ); |
| if ( valueOf != null ) |
| return valueOf; |
| |
| ValueConverter<V> constructor = constructorConverter( maybeWrapper ); |
| if ( constructor != null ) |
| return constructor; |
| |
| throw new IllegalArgumentException( clazz + " is not a value type" ); |
| } |
| |
| private static <V> ValueConverter<V> valueOfConverter( Class<V> clazz ) { |
| try { |
| Method valueOf = clazz.getMethod( "valueOf", String.class ); |
| if ( meetsConverterRequirements( valueOf, clazz ) ) |
| return new MethodInvokingValueConverter<>( valueOf, clazz ); |
| |
| return null; |
| } catch ( NoSuchMethodException ignored ) { |
| return null; |
| } |
| } |
| |
| private static <V> ValueConverter<V> constructorConverter( Class<V> clazz ) { |
| try { |
| return new ConstructorInvokingValueConverter<>( clazz.getConstructor( String.class ) ); |
| } catch ( NoSuchMethodException ignored ) { |
| return null; |
| } |
| } |
| |
| /** |
| * Invokes the given constructor with the given arguments. |
| * |
| * @param <T> constraint on the type of the objects yielded by the constructor |
| * @param constructor constructor to invoke |
| * @param args arguments to hand to the constructor |
| * @return the result of invoking the constructor |
| * @throws ReflectionException in lieu of the gaggle of reflection-related exceptions |
| */ |
| public static <T> T instantiate( Constructor<T> constructor, Object... args ) { |
| try { |
| return constructor.newInstance( args ); |
| } catch ( Exception ex ) { |
| throw reflectionException( ex ); |
| } |
| } |
| |
| /** |
| * Invokes the given static method with the given arguments. |
| * |
| * @param method method to invoke |
| * @param args arguments to hand to the method |
| * @return the result of invoking the method |
| * @throws ReflectionException in lieu of the gaggle of reflection-related exceptions |
| */ |
| public static Object invoke( Method method, Object... args ) { |
| try { |
| return method.invoke( null, args ); |
| } catch ( Exception ex ) { |
| throw reflectionException( ex ); |
| } |
| } |
| |
| @SuppressWarnings( "unchecked" ) |
| public static <V> V convertWith( ValueConverter<V> converter, String raw ) { |
| return converter == null ? (V) raw : converter.convert( raw ); |
| } |
| |
| private static boolean meetsConverterRequirements( Method method, Class<?> expectedReturnType ) { |
| int modifiers = method.getModifiers(); |
| return isPublic( modifiers ) && isStatic( modifiers ) && expectedReturnType.equals( method.getReturnType() ); |
| } |
| |
| private static RuntimeException reflectionException( Exception ex ) { |
| if ( ex instanceof IllegalArgumentException ) |
| return new ReflectionException( ex ); |
| if ( ex instanceof InvocationTargetException ) |
| return new ReflectionException( ex.getCause() ); |
| if ( ex instanceof RuntimeException ) |
| return (RuntimeException) ex; |
| |
| return new ReflectionException( ex ); |
| } |
| } |