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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 * accompanied this code).
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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 static methods to find a public field with specified name in specified class. 
Author:
Sergey A. Malenkov
Since:
1.7/**
 * 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.
Params:
type –  the class that can have field
name –  the name of field to find
Throws:
NoSuchFieldException – if field is not found
See Also:
Class.getField
Returns:
object that represents found field/**
     * 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");
        }
        if (!FinderUtils.isExported(type)) {
            throw new NoSuchFieldException("Field '" + name + "' is not accessible");
        }
        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.
Params:
type –  the class that can have field
name –  the name of field to find
Throws:
NoSuchFieldException – if field is not found
See Also:
Class.getField
Returns:
object that represents found 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.
Params:
type –  the class that can have field
name –  the name of field to find
Throws:
NoSuchFieldException – if field is not found
See Also:
Class.getField
Returns:
object that represents found 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.
/**
     * Disable instantiation.
     */
    private FieldFinder() {
    }
}