Example usage for java.lang Class getDeclaredField

Introduction

In this page you can find the example usage for java.lang Class getDeclaredField.

Prototype

@CallerSensitive
public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException

Source Link

Document

Returns a Field object that reflects the specified declared field of the class or interface represented by this Class object.

Usage

From source file:Main.java

private static Field scanField(Class<?> clazz, String... names) {
    for (String name : names) {
        try {// w  w w  .  j  a v  a  2  s .com
            final Field field = clazz.getDeclaredField(name);
            field.setAccessible(true);
            return field;
        } catch (NoSuchFieldException e) {
        }
        try {
            return clazz.getField(name);
        } catch (NoSuchFieldException e) {
        }
    }
    return null;
}

From source file:Main.java

private static Field prepareField(Class c, String fieldName) throws NoSuchFieldException {
    while (c != null) {
        try {//from  w w w  .j a  va  2 s .c o m
            Field f = c.getDeclaredField(fieldName);
            f.setAccessible(true);
            return f;
        } catch (Exception e) {
        } finally {
            c = c.getSuperclass();
        }
    }
    throw new NoSuchFieldException();
}

From source file:Main.java

/**
 * Retrieves the a field with the specified name from the given class. Other than Class's getField(String) method,
 * this method will also return protected and private fields.
 *
 * @param clazz     Class from which the field should be obtained.
 * @param fieldName Name of the field./*from ww w  .  jav a  2s. co m*/
 * @return field with the specified name.
 */
public static Field getField(final Class clazz, final String fieldName) {
    try {
        return clazz.getField(fieldName);
    } catch (NoSuchFieldException e) {
        /* Means there's no public field, let's keep looking */
    }

    Class runner = clazz;
    while (runner != null) {
        try {
            return runner.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
            /* No luck here either */
        }
        runner = runner.getSuperclass();
    }

    return null;
}

From source file:Main.java

public static Object getField(Object obj, Class<?> cl, String field)
        throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
    Field localField = cl.getDeclaredField(field);
    localField.setAccessible(true);/*  ww  w . ja  v  a 2  s . c  o  m*/
    return localField.get(obj);
}

From source file:com.facebook.hiveio.log.HiveLogHelpers.java

/**
 * Add class logger to the list of logs/*ww w . jav a2  s .  c  om*/
 *
 * @param logs List of logs
 * @param klass Class whose logger we want to add
 */
private static void addPrivateStaticLog(List<Log> logs, Class<?> klass) {
    try {
        Field logField = klass.getDeclaredField("LOG");
        logField.setAccessible(true);
        Log driverLog = (Log) logField.get(null);
        logs.add(driverLog);
    } catch (IllegalAccessException e) {
        LOG.error("Could not get LOG from Hive ql.Driver", e);
    } catch (NoSuchFieldException e) {
        LOG.error("Could not get LOG from Hive ql.Driver", e);
    }
}

From source file:Main.java

private static Object getField(Object obj, Class<?> cl, String field)
        throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
    Field localField = cl.getDeclaredField(field);
    localField.setAccessible(true);// ww w  .  j  a va 2  s .c  om
    return localField.get(obj);
}

From source file:Main.java

public static boolean overrideClassLoader(ClassLoader cl, File dex, File opt) {
    try {/*from w ww.j av a 2 s .c o  m*/
        ClassLoader bootstrap = cl.getParent();
        Field fPathList = BaseDexClassLoader.class.getDeclaredField("pathList");
        fPathList.setAccessible(true);
        Object pathList = fPathList.get(cl);
        Class cDexPathList = bootstrap.loadClass("dalvik.system.DexPathList");
        Field fDexElements = cDexPathList.getDeclaredField("dexElements");
        fDexElements.setAccessible(true);
        Object dexElements = fDexElements.get(pathList);
        DexClassLoader cl2 = new DexClassLoader(dex.getAbsolutePath(), opt.getAbsolutePath(), null, bootstrap);
        Object pathList2 = fPathList.get(cl2);
        Object dexElements2 = fDexElements.get(pathList2);
        Object element2 = Array.get(dexElements2, 0);
        int n = Array.getLength(dexElements) + 1;
        Object newDexElements = Array.newInstance(fDexElements.getType().getComponentType(), n);
        Array.set(newDexElements, 0, element2);
        for (int i = 0; i < n - 1; i++) {
            Object element = Array.get(dexElements, i);
            Array.set(newDexElements, i + 1, element);
        }
        fDexElements.set(pathList, newDexElements);
        return true;
    } catch (Exception e) {
        Log.e("lcast", "fail to override classloader " + cl + " with " + dex, e);
        return false;
    }
}

From source file:Main.java

public static void setField(Class<?> clazz, String fieldName, Object object, Object value)
        throws NoSuchFieldException, IllegalAccessException {
    Field field = clazz.getDeclaredField(fieldName);
    field.setAccessible(true);//w w  w  .jav  a  2  s  .  c om
    field.set(object, value);
}

From source file:RobotUtilities.java

public static void sendKeysCombo(String keys[]) {
    try {/* w  w  w .  j a va2  s.  c o m*/

        Robot robot = new Robot();

        Class<?> cl = KeyEvent.class;

        int[] intKeys = new int[keys.length];

        for (int i = 0; i < keys.length; i++) {
            Field field = cl.getDeclaredField(keys[i]);
            intKeys[i] = field.getInt(field);
            robot.keyPress(intKeys[i]);
        }

        for (int i = keys.length - 1; i >= 0; i--)
            robot.keyRelease(intKeys[i]);
    } catch (Throwable e) {
        System.err.println(e);
    }
}

From source file:io.fabric8.cxf.endpoint.BeanValidationAnnotationIntrospector.java

protected static Field findField(String fieldName, Class<?> declaringClass) {
    try {//from  w  w w. j  a v  a 2 s .  c  o  m
        return declaringClass.getDeclaredField(fieldName);
    } catch (NoSuchFieldException e) {
        Class<?> superclass = declaringClass.getSuperclass();
        if (superclass != null && superclass != declaringClass) {
            return findField(fieldName, superclass);
        } else {
            return null;
        }
    }
}