Example usage for java.lang.reflect Field get

Introduction

In this page you can find the example usage for java.lang.reflect Field get.

Prototype

@CallerSensitive
@ForceInline 
public Object get(Object obj) throws IllegalArgumentException, IllegalAccessException

Source Link

Document

Returns the value of the field represented by this Field , on the specified object.

Usage

From source file:Main.java

static Unsafe getSMU() {
    try {//w  ww.j  a v  a2 s  .co m
        return sun.misc.Unsafe.getUnsafe();
    } catch (SecurityException tryReflectionInstead) {
        // ignore
    }
    try {
        return java.security.AccessController.doPrivileged((PrivilegedExceptionAction<Unsafe>) () -> {
            Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
            for (Field f : k.getDeclaredFields()) {
                f.setAccessible(true);
                Object x = f.get(null);
                if (k.isInstance(x))
                    return k.cast(x);
            }
            throw new NoSuchFieldError("the Unsafe");
        });
    } catch (java.security.PrivilegedActionException e) {
        throw new RuntimeException("Could not initialize intrinsics", e.getCause());
    }
}

From source file:Main.java

/**
 * Converts a given string into a color.
 * /* www .  j  ava  2 s .  co m*/
 * @param value
 *          the string, either a name or a hex-string.
 * @return the color.
 */
public static Color stringToColor(final String value) {
    if (value == null) {
        return Color.black;
    }
    try {
        // get color by hex or octal value
        return Color.decode(value);
    } catch (NumberFormatException nfe) {
        // if we can't decode lets try to get it by name
        try {
            // try to get a color by name using reflection
            final Field f = Color.class.getField(value);

            return (Color) f.get(null);
        } catch (Exception ce) {
            // if we can't get any color return black
            return Color.black;
        }
    }
}

From source file:Main.java

public static Object getFieldValue(Object receiver, Object defaultValue, Field field) {
    if (field == null) {
        return defaultValue;
    }//  w  w  w.j a  v  a 2 s . co m

    try {
        return field.get(receiver);
    } catch (Exception e) {
        if (DEBUG) {
            e.printStackTrace();
        }
    }

    return defaultValue;
}

From source file:springobjectmapper.ReflectionHelper.java

public static Object[] getValues(List<Field> fields, Object o) {
    List<Object> results = new ArrayList<Object>();
    for (Field field : fields) {
        try {/*from  w ww  .ja  v  a2s  .c o  m*/
            results.add(field.get(o));
        } catch (Exception e) {
            ReflectionUtils.handleReflectionException(e);
        }
    }
    return results.toArray();
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> List<T> generatePropertyList(Collection<?> collection, String property) {
    assert property != null;
    if (collection == null || collection.isEmpty()) {
        return new ArrayList<T>(0);
    }//  w  w  w .  j ava2s.  c o  m
    List<T> list = new ArrayList<T>(collection.size());
    try {
        for (Object obj : collection) {
            Field field = obj.getClass().getDeclaredField(property);
            field.setAccessible(true);
            Object object = field.get(obj);
            list.add((T) object);
        }
        return list;
    } catch (Throwable e) {
        throw new RuntimeException(e);
    }
}

From source file:Main.java

/**
 * Get all fields' value and put them to a map.
 * //from ww w.  j  a v a  2  s .c  om
 * @param bean
 * @return Map
 */
public static Map<String, Object> getFieldValueMap(Object bean) {
    Class<?> cls = bean.getClass();
    Map<String, Object> valueMap = new HashMap<String, Object>();
    // Get all fields.
    Field[] fields = cls.getDeclaredFields();

    for (Field field : fields) {
        try {
            field.setAccessible(true);
            Object value = field.get(bean);
            //            if(value == null) {
            //               valueMap.put(field.getName(), "");
            //               continue;
            //            }
            valueMap.put(field.getName(), value);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    return valueMap;
}

From source file:Main.java

public static Object getDeclaredField(Object obj, Class<?> cls, String fieldName) throws NoSuchFieldException {
    if (obj == null || cls == null || fieldName == null) {
        throw new IllegalArgumentException("parameter can not be null!");
    }/*from  w  ww.j a  v  a2 s.  c om*/
    try {
        Field declaredField = cls.getDeclaredField(fieldName);
        declaredField.setAccessible(true);
        return declaredField.get(obj);
    } catch (Exception e) {
        throw new NoSuchFieldException(fieldName);
    }
}

From source file:Main.java

/**
 * Gets the {@code sun.misc.Unsafe} instance, or {@code null} if not available on this platform.
 *//*w w w  . ja va 2  s .c om*/
private static sun.misc.Unsafe getUnsafe() {
    sun.misc.Unsafe unsafe = null;
    try {
        unsafe = AccessController.doPrivileged(new PrivilegedExceptionAction<Unsafe>() {
            @Override
            public sun.misc.Unsafe run() throws Exception {
                Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;

                for (Field f : k.getDeclaredFields()) {
                    f.setAccessible(true);
                    Object x = f.get(null);
                    if (k.isInstance(x)) {
                        return k.cast(x);
                    }
                }
                // The sun.misc.Unsafe field does not exist.
                return null;
            }
        });
    } catch (Throwable e) {
        // Catching Throwable here due to the fact that Google AppEngine raises NoClassDefFoundError
        // for Unsafe.
    }
    return unsafe;
}

From source file:Main.java

public static boolean areNotificationsEnabled(Context context) {
    AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
    ApplicationInfo appInfo = context.getApplicationInfo();
    String pkg = context.getApplicationContext().getPackageName();
    int uid = appInfo.uid;
    try {/*from w w w .  j  a  v  a2s  . c  o  m*/
        Class<?> appOpsClass = Class.forName(AppOpsManager.class.getName());
        Method checkOpNoThrowMethod = appOpsClass.getMethod(CHECK_OP_NO_THROW, Integer.TYPE, Integer.TYPE,
                String.class);
        Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);
        int value = (Integer) opPostNotificationValue.get(Integer.class);
        return ((Integer) checkOpNoThrowMethod.invoke(appOps, value, uid, pkg) == AppOpsManager.MODE_ALLOWED);
    } catch (ClassNotFoundException | NoSuchMethodException | NoSuchFieldException | InvocationTargetException
            | IllegalAccessException | RuntimeException e) {
        return true;
    }
}

From source file:com.basho.riak.client.api.convert.reflection.ClassUtil.java

public static <T> Object getFieldValue(Field f, T obj) {
    Object value = null;/*from  w ww . j  a  v a  2 s.co  m*/
    try {
        value = f.get(obj);
    } catch (IllegalAccessException e) {
        throw new IllegalStateException("Unable to get Riak annotated field value", e);
    }

    return value;
}