/* * Copyright (c) 2008, 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; /** * 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");        }        if (!Modifier.isPublic(field.getDeclaringClass().getModifiers())) {            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() {    }}