Java Reflection Field Find findField(Class clazz, String fname, boolean isSearchSuperclass)

Description

find Field

License

Open Source License

Declaration

private static Field findField(Class<?> clazz, String fname, boolean isSearchSuperclass)
            throws NoSuchFieldException, AssertionError 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.lang.reflect.Field;

public class Main {
    private static Field findField(Class<?> clazz, String fname, boolean isSearchSuperclass)
            throws NoSuchFieldException, AssertionError {
        Field f = null;//from   w  ww  . j  a  va  2 s  . co  m
        try {
            f = clazz.getDeclaredField(fname);
        } catch (NoSuchFieldException e) {

        }
        if (f == null && isSearchSuperclass) {
            do {
                clazz = clazz.getSuperclass();
                if (clazz == null) {
                    throw new NoSuchFieldException("Class " + clazz + " has no such field: %s" + fname); //$NON-NLS-1$ //$NON-NLS-2$
                }
                try {
                    f = clazz.getDeclaredField(fname);
                } catch (NoSuchFieldException e) {

                }
            } while (f == null);
        }
        return f;
    }

    public static Object getDeclaredField(String name, Object this_) {
        try {
            Field field = this_.getClass().getDeclaredField(name);
            field.setAccessible(true);
            return getField(field, this_);
        } catch (SecurityException e) {
            throw new AssertionError(e);
        } catch (NoSuchFieldException e) {
            throw new AssertionError(e);
        }
    }

    /**
     * Gets value of field in spite of access permission.
     */
    public static Object getField(Field f, Object this_) {
        try {
            f.setAccessible(true);
            return f.get(this_);
        } catch (IllegalAccessException e) {
            throw new AssertionError(e);
        }
    }

    /**
     * Gets value of field in spite of access permission.
     *
     * @throws AssertionError if no such field in the class
     */
    public static Object getField(Class<?> clazz, String fname, Object this_, boolean isSearchSuperclass) {
        try {
            Field f = findField(clazz, fname, isSearchSuperclass);
            return getField(f, this_);
        } catch (NoSuchFieldException e) {
            throw new AssertionError(e);
        }
    }
}

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