--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.internal.opt/share/classes/jdk/internal/joptsimple/internal/Reflection.java Tue Jan 26 09:18:51 2016 +0000
@@ -0,0 +1,176 @@
+/*
+ * 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) 2004-2014 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.getDeclaredMethod( "valueOf", String.class );
+ if ( meetsConverterRequirements( valueOf, clazz ) )
+ return new MethodInvokingValueConverter<V>( valueOf, clazz );
+
+ return null;
+ }
+ catch ( NoSuchMethodException ignored ) {
+ return null;
+ }
+ }
+
+ private static <V> ValueConverter<V> constructorConverter( Class<V> clazz ) {
+ try {
+ return new ConstructorInvokingValueConverter<V>( 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 );
+ }
+}