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:com.infinira.aerospike.dataaccess.util.Utils.java

@SuppressWarnings("unchecked")
public static <V> V get(Object object, String fieldName) {
    Assert.notNull(object, "Object cannot be null.");
    Assert.notNull(fieldName, "Fieldname cannot be null.");
    Class<?> clazz = object.getClass();
    while (clazz != null) {
        try {//from w  ww  .j  a  v a2 s . c  o m
            Field field = clazz.getDeclaredField(fieldName);
            field.setAccessible(true);
            return (V) field.get(object);
        } catch (NoSuchFieldException e) {
            clazz = clazz.getSuperclass();
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    return null;
}

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From source file:Main.java

/**
 * Extracts a field from a class using reflection.
 *
 * @param clazz from which to get the field object
 * @param name the name of the field object
 * @return the field object./* w ww  .  ja  v  a 2s . c o m*/
 * @throws PrivilegedActionException
 */
static Field getField(final Class<?> clazz, final String name) throws PrivilegedActionException {
    final PrivilegedExceptionAction<Field> action = new PrivilegedExceptionAction<Field>() {
        public Field run() throws Exception {
            Field field = clazz.getDeclaredField(name);
            field.setAccessible(true);
            return field;
        }
    };

    return AccessController.doPrivileged(action);
}

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From source file:de.cbb.mplayer.util.ReflectionHelper.java

/**
 * Searches for a field in the given class and all of its super classes.
 * @param clazz Class to start the search for the field
 * @param name Name of the field//from  w  ww. ja v a2 s. com
 * @return The field that was found
 * @throws NoSuchFieldException
 */
public static Field getField(Class<?> clazz, String name) throws NoSuchFieldException {
    Class<?> searchClass = clazz;
    Field field = null;
    while (field == null && searchClass != null) {
        try {
            field = searchClass.getDeclaredField(name);
        } catch (NoSuchFieldException e) {
            searchClass = searchClass.getSuperclass();
        }
    }
    if (field == null) {
        throw new NoSuchFieldException(clazz.getSimpleName() + "." + name); //$NON-NLS-1$
    }
    return field;
}

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From source file:Main.java

private static ArrayList<ArrayList> sortObjectArrayListSimpleMaster(ArrayList listIn, String paramName) {
    ArrayList<ArrayList> answer = new ArrayList<ArrayList>();
    ArrayList newList = new ArrayList();
    ArrayList<Integer> indices = new ArrayList<Integer>();
    try {//w w w.jav a 2 s  .  c om
        if (listIn.size() > 0) {
            Class<?> c = listIn.get(0).getClass();
            Field f = c.getDeclaredField(paramName);
            f.setAccessible(true);
            Class<?> t = f.getType();
            Double dd = new Double(14);
            Float ff = new Float(14);
            Integer ii = new Integer(14);
            Map sortedPos = new LinkedHashMap();
            Map sortedNeg = new LinkedHashMap();
            Map unsorted = new LinkedHashMap();
            int indexCount = 0;
            long count = 0;
            if (t.isPrimitive()) {
                for (Object thisObj : listIn) {
                    Object o = f.get(thisObj);
                    double d = 0;
                    if (t.getName().equals("char")) {
                        d = (int) ((Character) o);
                    } else if (t.isInstance(dd))
                        d = (Double) o;
                    else if (t.isInstance(ff))
                        d = (Float) o;
                    else if (t.isInstance(ii))
                        d = (Integer) o;
                    else
                        d = new Double(o.toString());

                    boolean isNegative = false;

                    if (d < 0) {
                        isNegative = true;
                        d = Math.abs(d);
                    }

                    String format = "%1$30f";
                    String newKey = String.format(format, d);
                    String format2 = "%1$20d";
                    String countString = String.format(format2, count);
                    newKey += "-" + countString;
                    if (isNegative) {
                        sortedNeg.put(newKey, thisObj);
                    } else {
                        sortedPos.put(newKey, thisObj);
                    }
                    unsorted.put(thisObj, indexCount);
                    count++;
                    indexCount++;
                }
                TreeMap<String, Object> resultPos = new TreeMap();
                resultPos.putAll(sortedPos);
                sortedPos = resultPos;
                TreeMap<String, Object> resultNeg = new TreeMap();
                resultNeg.putAll(sortedNeg);
                sortedNeg = resultNeg;
            } else if (t.isInstance(paramName)) {
                // System.out.println("is a string with value " + o);
                for (Object thisObj : listIn) {
                    String key = (String) (f.get(thisObj));
                    sortedPos.put(key + "-" + count, thisObj);
                    unsorted.put(thisObj, indexCount);
                    count++;
                    indexCount++;
                }
                TreeMap<String, Object> result = new TreeMap(String.CASE_INSENSITIVE_ORDER);
                result.putAll(sortedPos);
                sortedPos = result;
            }

            Iterator itNeg = sortedNeg.entrySet().iterator();
            while (itNeg.hasNext()) {
                Map.Entry pairs = (Map.Entry) itNeg.next();
                newList.add(pairs.getValue());
                itNeg.remove();
            }

            Collections.reverse(newList);

            Iterator itPos = sortedPos.entrySet().iterator();
            while (itPos.hasNext()) {
                Map.Entry pairs = (Map.Entry) itPos.next();
                Object obj = pairs.getValue();
                newList.add(obj);
                indices.add((Integer) unsorted.get(obj));
                itPos.remove();
            }
        }
    } catch (Exception e) {
        System.out
                .println("problem sorting list.  listIn.size(): " + listIn.size() + " and param: " + paramName);
        answer.add(newList);
        answer.add(indices);
        return answer;
    }
    answer.add(newList);
    answer.add(indices);
    return answer;
}

---

From source file:com.junly.common.util.ReflectUtils.java

/**
 * <p class="detail">/*from   w ww  .j  a va 2  s .  c om*/
 * ?
 * </p>
 * @author wan.Dong
 * @date 20161112 
 * @param obj   
 * @param name   ??
 * @return
 */
public static Object getProperty(Object obj, String name) {
    if (obj != null) {
        Class<?> clazz = obj.getClass();
        while (clazz != null) {
            Field field = null;
            try {
                field = clazz.getDeclaredField(name);
            } catch (Exception e) {
                clazz = clazz.getSuperclass();
                continue;
            }
            try {
                field.setAccessible(true);
                return field.get(obj);
            } catch (Exception e) {
                return null;
            } finally {
                field.setAccessible(false);
            }
        }
    }
    return null;
}

---

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!");
    }/* w  w  w .j a va  2s.c o  m*/
    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

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. ja va  2 s .com*/
        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:edu.umd.cs.marmoset.utilities.JProcess.java

/**
 * Uses reflection to extract the pid, a private field of the private class UNIXProcess.
 * This will fail on any non-Unix platform that doesn't use UNIXProcess.  It may
 * fail if the UNIXProcess class changes at all.  It may fail anyway for unpredictable
 * reasons.//from  w w w  . ja  v  a  2  s .c o  m
 * @param process The process
 * @return the pid of this process
 * @throws NoSuchFieldException
 * @throws IllegalAccessException
 */
public static int getPid(Process process) throws NoSuchFieldException, IllegalAccessException {
    Class<? extends Process> processClass = process.getClass();
    Field pidField = processClass.getDeclaredField("pid");
    pidField.setAccessible(true);
    return pidField.getInt(process);
}

---

From source file:com.prowidesoftware.deprecation.DeprecationUtils.java

/**
 * Helper hack to set environment variables from Java code
 *//*  ww w.ja v a 2s .c o m*/
@SuppressWarnings({ "unchecked", "rawtypes" })
private static void setEnv(final String key, final String value) {
    try {
        Class<?> processEnvironmentClass = Class.forName("java.lang.ProcessEnvironment");
        Field theEnvironmentField = processEnvironmentClass.getDeclaredField("theEnvironment");
        theEnvironmentField.setAccessible(true);
        Map<String, String> env = (Map<String, String>) theEnvironmentField.get(null);
        env.put(key, value);
        Field theCaseInsensitiveEnvironmentField = processEnvironmentClass
                .getDeclaredField("theCaseInsensitiveEnvironment");
        theCaseInsensitiveEnvironmentField.setAccessible(true);
        Map<String, String> cienv = (Map<String, String>) theCaseInsensitiveEnvironmentField.get(null);
        cienv.put(key, value);
    } catch (NoSuchFieldException e) {
        try {
            Class[] classes = Collections.class.getDeclaredClasses();
            Map<String, String> env = System.getenv();
            for (Class cl : classes) {
                if ("java.util.Collections$UnmodifiableMap".equals(cl.getName())) {
                    Field field = cl.getDeclaredField("m");
                    field.setAccessible(true);
                    Object obj = field.get(env);
                    Map<String, String> map = (Map<String, String>) obj;
                    map.clear();
                    map.put(key, value);
                }
            }
        } catch (Exception e2) {
            e2.printStackTrace();
        }
    } catch (Exception e1) {
        e1.printStackTrace();
    }
}

---

From source file:com.relicum.titleapi.Reflection.ReflectionUtil.java

public static void setPrivateField(Class<EntityArmorStand> clazz, Object handle, String fieldName, Object value)
        throws Exception {
    Field field = clazz.getDeclaredField(fieldName);
    field.setAccessible(true);//from  w  ww  .  ja v a  2 s.co m
    field.set(handle, value);
}

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