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:de.cbb.mplayer.util.ReflectionHelper.java

/**
 * Utility method to read a field value. If the field is not accessible, it will be set to be accessible.
 * @param object Instance in which the value should be read
 * @param name Name of the field who's value should be read
 * @return The value of the field//from  w  w w.j a  v  a  2  s.  c  o  m
 */
public static Object getFieldValue(Object object, String name) {
    try {
        Field field = getField(object.getClass(), name);
        if (!field.isAccessible()) {
            field.setAccessible(true);
        }
        return field.get(object);
    } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
        throw new RuntimeException(
                "Could not read field value: " + object.getClass().getSimpleName() + "." + name, e); //$NON-NLS-1$ //$NON-NLS-2$
    }
}

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From source file:io.github.pellse.decorator.util.reflection.ReflectionUtils.java

public static Optional<Object> getField(Object obj, Field field) {
    return Optional.ofNullable(CheckedSupplier.of(() -> {
        field.setAccessible(true);/*from w  w  w.ja  va2  s  .co m*/
        return field.get(obj);
    }).get());
}

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From source file:Main.java

public static int getStatusBarHeight(Context context) {
    Class<?> c;//from w w w  . ja  va 2 s. co  m
    Object obj;
    Field field;
    int x, statusBarHeight = 0;
    try {
        c = Class.forName("com.android.internal.R$dimen");
        obj = c.newInstance();
        field = c.getField("status_bar_height");
        x = Integer.parseInt(field.get(obj).toString());
        statusBarHeight = context.getResources().getDimensionPixelSize(x);
    } catch (Exception e1) {
        e1.printStackTrace();
    }
    return statusBarHeight;
    /**
     * Rect frame = new Rect();
            
     getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
            
     int statusBarHeight = frame.top;
     */
}

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From source file:Main.java

/**
 * Swing menus are looking pretty bad on Linux when the GTK LaF is used (See
 * bug #6925412). It will most likely never be fixed anytime soon so this
 * method provides a workaround for it. It uses reflection to change the GTK
 * style objects of Swing so popup menu borders have a minimum thickness of
 * 1 and menu separators have a minimum vertical thickness of 1.
 *///from  www  .j  a va 2s. c o  m
public static void installGtkPopupBugWorkaround() {
    // Get current look-and-feel implementation class
    LookAndFeel laf = UIManager.getLookAndFeel();
    Class<?> lafClass = laf.getClass();

    // Do nothing when not using the problematic LaF
    if (!lafClass.getName().equals("com.sun.java.swing.plaf.gtk.GTKLookAndFeel"))
        return;

    // We do reflection from here on. Failure is silently ignored. The
    // workaround is simply not installed when something goes wrong here
    try {
        // Access the GTK style factory
        Field field = lafClass.getDeclaredField("styleFactory");
        boolean accessible = field.isAccessible();
        field.setAccessible(true);
        Object styleFactory = field.get(laf);
        field.setAccessible(accessible);

        // Fix the horizontal and vertical thickness of popup menu style
        Object style = getGtkStyle(styleFactory, new JPopupMenu(), "POPUP_MENU");
        fixGtkThickness(style, "yThickness");
        fixGtkThickness(style, "xThickness");

        // Fix the vertical thickness of the popup menu separator style
        style = getGtkStyle(styleFactory, new JSeparator(), "POPUP_MENU_SEPARATOR");
        fixGtkThickness(style, "yThickness");
    } catch (Exception e) {
        // Silently ignored. Workaround can't be applied.
    }
}

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From source file:Main.java

public static int getStatusBarHeight(Context context) {
    Class<?> c = null;//from w ww  . java 2  s . co m
    Object obj = null;
    Field field = null;
    int x = 0;
    int sbar = 0;
    try {
        c = Class.forName("com.android.internal.R$dimen");
        obj = c.newInstance();
        field = c.getField("status_bar_height");
        x = Integer.parseInt(field.get(obj).toString());
        sbar = context.getResources().getDimensionPixelSize(x);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return sbar;
}

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From source file:Main.java

public static Dialog waitForCurrentDialogShowing(final Activity activity, final long timeout)
        throws InterruptedException {
    long start = System.currentTimeMillis();
    try {//  w w w .j a  va  2s .  c  o  m
        Field currentDialogField = activity.getClass().getDeclaredField("currentDialog");
        currentDialogField.setAccessible(true);
        Dialog dialog = null;
        while (dialog == null || !dialog.isShowing()) {
            dialog = (Dialog) currentDialogField.get(activity);
            Thread.sleep(50);
            long now = System.currentTimeMillis();
            if (now - start > timeout) {
                throw new InterruptedException(
                        String.format("Timeout exceeded while waiting for dialog showing"));
            }
        }
        return dialog;
    } catch (Exception e) {
        throw new InterruptedException(String.format("Exception while waiting for dialog showing"));
    }
}

---

From source file:Main.java

private static List<Thread> getThreadsFor(Runnable myRunnable) throws Exception {
    Method getThreads = Thread.class.getDeclaredMethod("getThreads");
    Field target = Thread.class.getDeclaredField("target");
    target.setAccessible(true);//from www. ja va  2s . c  om
    getThreads.setAccessible(true);
    Thread[] threads = (Thread[]) getThreads.invoke(null);
    List<Thread> result = new ArrayList<Thread>();
    for (Thread thread : threads) {
        Object runnable = target.get(thread);
        if (runnable == myRunnable)
            result.add(thread);
    }
    return result;
}

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From source file:org.web4thejob.util.L10nUtil.java

public static List<L10nString> getLocalizableResources(final Class<?> localizable) {
    final List<L10nString> strings = new ArrayList<L10nString>();
    final Set<Class> classes = new HashSet<Class>();
    classes.add(localizable);/*from  w  w  w  . j  av  a2  s  .  com*/
    classes.addAll(ClassUtils.getAllInterfacesForClassAsSet(localizable));

    for (Class<?> clazz : classes) {
        ReflectionUtils.doWithFields(clazz, new ReflectionUtils.FieldCallback() {
            @Override
            public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
                strings.add((L10nString) field.get(null));
            }
        }, new ReflectionUtils.FieldFilter() {
            @Override
            public boolean matches(Field field) {
                return ReflectionUtils.isPublicStaticFinal(field) && L10nString.class.equals(field.getType());
            }
        });
    }

    //get localizable resources from extension modules
    for (Module module : ContextUtil.getModules()) {
        if (module instanceof LocalizableModule) {
            strings.addAll(((LocalizableModule) module).getLocalizableStrings(classes));
        }
    }

    // add commands,settings and global strings here...
    if (DesktopLayoutPanel.class.isAssignableFrom(localizable)) {
        for (CommandEnum commandEnum : CommandEnum.values()) {
            L10nString l10nString = new L10nString(CommandEnum.class, commandEnum.name(),
                    L10nUtil.getMessage(commandEnum.getClass(), commandEnum.name(), commandEnum.name()));
            strings.add(l10nString);
        }

        for (SettingEnum settingEnum : SettingEnum.values()) {
            L10nString l10nString = new L10nString(SettingEnum.class, settingEnum.name(),
                    L10nUtil.getMessage(settingEnum.getClass(), settingEnum.name(), settingEnum.name()));
            strings.add(l10nString);
        }

        for (Condition condition : Condition.getConditions()) {
            L10nString l10nString = new L10nString(Condition.class, condition.getKey(), condition.getKey());
            strings.add(l10nString);
        }
    }

    return strings;
}

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From source file:Main.java

public static ContentValues objectToContentValues(Object object) {
    if (object == null) {
        throw new IllegalArgumentException("please check your argument");
    }//from  www .j  a  va2 s  . c  o m
    ContentValues contentValues = new ContentValues();
    try {
        Field[] fields = object.getClass().getDeclaredFields();
        for (Field field : fields) {
            String fieldName = field.getName();
            Type type = field.getType();
            field.setAccessible(true);
            if (type.equals(String.class)) {
                contentValues.put(fieldName, field.get(object).toString());
            } else if (type.equals(Integer.class) || type.equals(Integer.TYPE)) {
                contentValues.put(fieldName, field.getInt(object));
            } else if (type.equals(Float.class) || type.equals(Float.TYPE)) {
                contentValues.put(fieldName, field.getFloat(object));
            } else if (type.equals(Long.class) || type.equals(Long.TYPE)) {
                contentValues.put(fieldName, field.getLong(object));
            } else if (type.equals(Double.class) || type.equals(Double.TYPE)) {
                contentValues.put(fieldName, field.getDouble(object));
            } else if (type.equals(Boolean.class) || type.equals(Boolean.TYPE)) {
                contentValues.put(fieldName, field.getBoolean(object));
            }
        }
    } catch (IllegalAccessException | IllegalArgumentException e) {
        e.printStackTrace();
    }
    return contentValues;
}

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From source file:ColorUtils.java

private static Map<String, Color> buildNameToColorMap() {
    Map<String, Color> colorMap = new HashMap<String, Color>();
    for (Field field : Color.class.getDeclaredFields()) {
        if (isConstantColorField(field)) {
            try {
                Color color = (Color) field.get(null);
                colorMap.put(field.getName().toUpperCase(), color);
            } catch (IllegalAccessException e) {
                // Should not occur because the field is public and static
            }/*from  w w  w . j  av  a2 s .  c o  m*/
        }
    }

    colorMap.put("DARKGREY", getColor("555555"));
    colorMap.put("DARKBLUE", getColor("000055"));
    colorMap.put("DARKRED", getColor("550000"));
    colorMap.put("DARKGREEN", getColor("005500"));

    colorMap.put("DARK_GREY", getColor("555555"));
    colorMap.put("DARK_BLUE", getColor("000055"));
    colorMap.put("DARK_RED", getColor("550000"));
    colorMap.put("DARK_GREEN", getColor("005500"));

    return colorMap;
}

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