110 lines
3.9 KiB
Java
110 lines
3.9 KiB
Java
/*
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* Copyright (c) 2008, 2012, 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 java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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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 field with specified name
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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 FieldFinder {
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/**
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* Finds public field (static or non-static)
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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 field
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* @param name the name of field to find
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* @return object that represents found field
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* @throws NoSuchFieldException if field is not found
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* @see Class#getField
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*/
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public static Field findField(Class<?> type, String name) throws NoSuchFieldException {
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if (name == null) {
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throw new IllegalArgumentException("Field name is not set");
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}
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Field field = type.getField(name);
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if (!Modifier.isPublic(field.getModifiers())) {
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throw new NoSuchFieldException("Field '" + name + "' is not public");
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}
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type = field.getDeclaringClass();
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if (!Modifier.isPublic(type.getModifiers()) || !isPackageAccessible(type)) {
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throw new NoSuchFieldException("Field '" + name + "' is not accessible");
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}
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return field;
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}
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/**
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* Finds public non-static field
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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 field
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* @param name the name of field to find
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* @return object that represents found field
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* @throws NoSuchFieldException if field is not found
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* @see Class#getField
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*/
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public static Field findInstanceField(Class<?> type, String name) throws NoSuchFieldException {
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Field field = findField(type, name);
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if (Modifier.isStatic(field.getModifiers())) {
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throw new NoSuchFieldException("Field '" + name + "' is static");
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}
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return field;
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}
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/**
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* Finds public static field
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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 field
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* @param name the name of field to find
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* @return object that represents found field
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* @throws NoSuchFieldException if field is not found
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* @see Class#getField
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*/
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public static Field findStaticField(Class<?> type, String name) throws NoSuchFieldException {
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Field field = findField(type, name);
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if (!Modifier.isStatic(field.getModifiers())) {
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throw new NoSuchFieldException("Field '" + name + "' is not static");
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}
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return field;
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}
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/**
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* Disable instantiation.
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*/
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private FieldFinder() {
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}
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}
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