| /* |
| * Copyright (c) 2008, 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.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| |
| import static sun.reflect.misc.ReflectUtil.isPackageAccessible; |
| |
| /** |
| * This utility class provides {@code static} methods |
| * to find a public field with specified name |
| * in specified class. |
| * |
| * @since 1.7 |
| * |
| * @author Sergey A. Malenkov |
| */ |
| public final class FieldFinder { |
| |
| /** |
| * Finds public field (static or non-static) |
| * that is declared in public class. |
| * |
| * @param type the class that can have field |
| * @param name the name of field to find |
| * @return object that represents found field |
| * @throws NoSuchFieldException if field is not found |
| * @see Class#getField |
| */ |
| public static Field findField(Class<?> type, String name) throws NoSuchFieldException { |
| if (name == null) { |
| throw new IllegalArgumentException("Field name is not set"); |
| } |
| Field field = type.getField(name); |
| if (!Modifier.isPublic(field.getModifiers())) { |
| throw new NoSuchFieldException("Field '" + name + "' is not public"); |
| } |
| type = field.getDeclaringClass(); |
| if (!Modifier.isPublic(type.getModifiers()) || !isPackageAccessible(type)) { |
| throw new NoSuchFieldException("Field '" + name + "' is not accessible"); |
| } |
| return field; |
| } |
| |
| /** |
| * Finds public non-static field |
| * that is declared in public class. |
| * |
| * @param type the class that can have field |
| * @param name the name of field to find |
| * @return object that represents found field |
| * @throws NoSuchFieldException if field is not found |
| * @see Class#getField |
| */ |
| public static Field findInstanceField(Class<?> type, String name) throws NoSuchFieldException { |
| Field field = findField(type, name); |
| if (Modifier.isStatic(field.getModifiers())) { |
| throw new NoSuchFieldException("Field '" + name + "' is static"); |
| } |
| return field; |
| } |
| |
| /** |
| * Finds public static field |
| * that is declared in public class. |
| * |
| * @param type the class that can have field |
| * @param name the name of field to find |
| * @return object that represents found field |
| * @throws NoSuchFieldException if field is not found |
| * @see Class#getField |
| */ |
| public static Field findStaticField(Class<?> type, String name) throws NoSuchFieldException { |
| Field field = findField(type, name); |
| if (!Modifier.isStatic(field.getModifiers())) { |
| throw new NoSuchFieldException("Field '" + name + "' is not static"); |
| } |
| return field; |
| } |
| |
| /** |
| * Disable instantiation. |
| */ |
| private FieldFinder() { |
| } |
| } |