dollar.java

import java.util.*;
import java.lang.*;
import java.io.*;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;


public class Dollar {
        private final String tag = "DOLLAR";
        
        public <T> T $(Object varName) {
            try {
                return (T) findField(getClass(), varName.toString()).get(this);
            } catch (IllegalAccessException e) {
                return null;
            }
        }

        public <T> Class<? extends T> lookAhead(Object varName) {
            Field field = findField(getClass(), varName.toString());
            return field != null ? (Class<? extends T>) field.getType() : null;
        }

        private static Field findField(Class<?> current, String varName) {
            try {
                return current.getDeclaredField(varName);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            }
            List<Class<?>> classesToGo = new ArrayList<>();
            Class<?> sup = current.getSuperclass();
            classesToGo.add(sup);
            classesToGo.addAll(Arrays.asList(current.getInterfaces()));
            for (Class<?> c : classesToGo) {
                if (c != null && !c.equals(Object.class)) {
                    try {
                        Field f = findField(c, varName);
                        if (f != null) {
                            return f;
                        }
                    } catch (Exception e) {

                    }
                }
            }
            return null;
        }
        
        @Deprecated
        public <T> T $_(Object varName) {
            try {
                return (T) getClass().getDeclaredField(varName.toString()).get(this);
            } catch (Throwable t) {
                try {
                    return (T) t;
                } catch (Throwable e) {
                    return null;
                }
            }
        }
    }