Example usage for java.lang Class getDeclaredField

List of usage examples for java.lang Class getDeclaredField

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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:net.sf.keystore_explorer.crypto.jcepolicy.JcePolicyUtil.java

/**
 * Hack to disable crypto restrictions until Java 9 is out.
 *
 * See http://stackoverflow.com/a/22492582/2672392
 *///from  w ww.j  a v  a  2  s  . c o  m
public static void removeRestrictions() {
    try {
        Class<?> jceSecurityClass = Class.forName("javax.crypto.JceSecurity");
        Class<?> cryptoPermissionsClass = Class.forName("javax.crypto.CryptoPermissions");
        Class<?> cryptoAllPermissionClass = Class.forName("javax.crypto.CryptoAllPermission");

        Field isRestrictedField = jceSecurityClass.getDeclaredField("isRestricted");
        isRestrictedField.setAccessible(true);
        Field modifiersField = Field.class.getDeclaredField("modifiers");
        modifiersField.setAccessible(true);
        modifiersField.setInt(isRestrictedField, isRestrictedField.getModifiers() & ~Modifier.FINAL);
        isRestrictedField.set(null, false);

        Field defaultPolicyField = jceSecurityClass.getDeclaredField("defaultPolicy");
        defaultPolicyField.setAccessible(true);
        PermissionCollection defaultPolicy = (PermissionCollection) defaultPolicyField.get(null);

        Field permsField = cryptoPermissionsClass.getDeclaredField("perms");
        permsField.setAccessible(true);
        ((Map<?, ?>) permsField.get(defaultPolicy)).clear();

        Field cryptoAllPermissionInstanceField = cryptoAllPermissionClass.getDeclaredField("INSTANCE");
        cryptoAllPermissionInstanceField.setAccessible(true);
        defaultPolicy.add((Permission) cryptoAllPermissionInstanceField.get(null));
    } catch (Exception e) {
        // ignore
    }
}

From source file:com.facebook.presto.hive.s3.TestPrestoS3FileSystem.java

@SuppressWarnings("unchecked")
private static <T> T getFieldValue(Object instance, Class<?> clazz, String name, Class<T> type) {
    try {//  w w w  . ja  v  a  2 s  . c o m
        Field field = clazz.getDeclaredField(name);
        checkArgument(field.getType() == type, "expected %s but found %s", type, field.getType());
        field.setAccessible(true);
        return (T) field.get(instance);
    } catch (ReflectiveOperationException e) {
        throw new RuntimeException(e);
    }
}

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.
 *//*w w w.  ja v a2 s . 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.
    }
}

From source file:net.kamhon.ieagle.util.VoUtil.java

private static Field getFieldForNotNestedProperty(Object obj, String propertyName) {
    Field field = null;/* ww  w  . j  a  v a2  s  .  c  o m*/

    Class<?> tmpClazz = obj.getClass();
    // looping up to superclass to get decleared field
    do {
        try {
            field = tmpClazz.getDeclaredField(propertyName);
        } catch (Exception ex) {
        }

        if (field != null) {
            break;
        }

        tmpClazz = tmpClazz.getSuperclass();
    } while (tmpClazz != null);

    return field;
}

From source file:IntrospectionUtil.java

public static Field findField(Class clazz, String targetName, Class targetType, boolean checkInheritance,
        boolean strictType) throws NoSuchFieldException {
    if (clazz == null)
        throw new NoSuchFieldException("No class");
    if (targetName == null)
        throw new NoSuchFieldException("No field name");

    try {// www .  jav  a  2 s  .  c  o m
        Field field = clazz.getDeclaredField(targetName);
        if (strictType) {
            if (field.getType().equals(targetType))
                return field;
        } else {
            if (field.getType().isAssignableFrom(targetType))
                return field;
        }
        if (checkInheritance) {
            return findInheritedField(clazz.getPackage(), clazz.getSuperclass(), targetName, targetType,
                    strictType);
        } else
            throw new NoSuchFieldException("No field with name " + targetName + " in class " + clazz.getName()
                    + " of type " + targetType);
    } catch (NoSuchFieldException e) {
        return findInheritedField(clazz.getPackage(), clazz.getSuperclass(), targetName, targetType,
                strictType);
    }
}

From source file:com.bt.download.android.gui.UniversalScanner.java

private static Uri nativeScanFile(Context context, String path) {
    try {/*from w  ww .  j  av  a2  s.  com*/
        File f = new File(path);

        Class<?> clazz = Class.forName("android.media.MediaScanner");

        Constructor<?> mediaScannerC = clazz.getDeclaredConstructor(Context.class);
        Object scanner = mediaScannerC.newInstance(context);

        Field mClientF = clazz.getDeclaredField("mClient");
        mClientF.setAccessible(true);
        Object mClient = mClientF.get(scanner);

        Method scanSingleFileM = clazz.getDeclaredMethod("scanSingleFile", String.class, String.class,
                String.class);
        Uri fileUri = (Uri) scanSingleFileM.invoke(scanner, f.getAbsolutePath(), "external", "data/raw");
        int n = context.getContentResolver().delete(fileUri, null, null);
        if (n > 0) {
            LOG.debug("Deleted from Files provider: " + fileUri);
        }

        Field mNoMediaF = mClient.getClass().getDeclaredField("mNoMedia");
        mNoMediaF.setAccessible(true);
        mNoMediaF.setBoolean(mClient, false);

        // This is only for HTC (tested only on HTC One M8)
        try {
            Field mFileCacheF = clazz.getDeclaredField("mFileCache");
            mFileCacheF.setAccessible(true);
            mFileCacheF.set(scanner, new HashMap<String, Object>());
        } catch (Throwable e) {
            // no an HTC, I need some time to refactor this hack
        }

        Method doScanFileM = mClient.getClass().getDeclaredMethod("doScanFile", String.class, String.class,
                long.class, long.class, boolean.class, boolean.class, boolean.class);
        Uri mediaUri = (Uri) doScanFileM.invoke(mClient, f.getAbsolutePath(), null, f.lastModified(),
                f.length(), false, true, false);

        Method releaseM = clazz.getDeclaredMethod("release");
        releaseM.invoke(scanner);

        return mediaUri;

    } catch (Throwable e) {
        e.printStackTrace();
        return null;
    }
}

From source file:com.xhsoft.framework.common.utils.ReflectUtil.java

/**
 * <p>Description:setFieldValue</p>
 * @param target/*  ww  w.j a  v a  2 s.co  m*/
 * @param fname
 * @param ftype
 * @param fvalue
 * @return void
 */
@SuppressWarnings("unchecked")
public static void setFieldValue(Object target, String fname, Class ftype, Object fvalue) {
    if (target == null || fname == null || "".equals(fname)
            || (fvalue != null && !ftype.isAssignableFrom(fvalue.getClass()))) {
        return;
    }

    Class clazz = target.getClass();

    try {
        Method method = clazz
                .getDeclaredMethod("set" + Character.toUpperCase(fname.charAt(0)) + fname.substring(1), ftype);

        if (!Modifier.isPublic(method.getModifiers())) {
            method.setAccessible(true);
        }

        method.invoke(target, fvalue);

    } catch (Exception me) {
        try {
            Field field = clazz.getDeclaredField(fname);

            if (!Modifier.isPublic(field.getModifiers())) {
                field.setAccessible(true);
            }

            field.set(target, fvalue);
        } catch (Exception fe) {

            if (logger.isDebugEnabled()) {
                logger.debug(fe);
            }
        }
    }
}

From source file:com.github.dozermapper.core.util.ReflectionUtils.java

private static Field getFieldFromBean(Class<?> clazz, String fieldName, final Class<?> originalClass) {
    try {//from   w w w.ja  va2  s  .  c  o  m
        Field field = clazz.getDeclaredField(fieldName);
        // Allow access to private instance var's that dont have public setter.
        field.setAccessible(true);
        return field;
    } catch (NoSuchFieldException e) {
        if (clazz.getSuperclass() != null) {
            return getFieldFromBean(clazz.getSuperclass(), fieldName, originalClass);
        }
        throw new MappingException("No such field found " + originalClass.getName() + "." + fieldName, e);
    }
}

From source file:com.github.fcannizzaro.resourcer.Resourcer.java

/**
 * Parse values xml files/*from w ww. ja v  a2  s.  c  o m*/
 */
private static void findValues() {

    values = new HashMap<>();

    File dir = new File(PATH_BASE + VALUES_DIR);

    if (!dir.isDirectory())
        return;

    File[] files = dir.listFiles();

    if (files == null)
        return;

    for (File file : files)

        // only *.xml files
        if (file.getName().matches(".*\\.xml$")) {

            Document doc = FileUtils.readXML(file.getAbsolutePath());

            if (doc == null)
                return;

            Element ele = doc.getDocumentElement();

            for (String element : elements) {

                NodeList list = ele.getElementsByTagName(element);

                if (values.get(element) == null)
                    values.put(element, new HashMap<>());

                for (int j = 0; j < list.getLength(); j++) {

                    Element node = (Element) list.item(j);
                    String value = node.getFirstChild().getNodeValue();
                    Object valueDefined = value;

                    switch (element) {
                    case INTEGER:
                        valueDefined = Integer.valueOf(value);
                        break;
                    case DOUBLE:
                        valueDefined = Double.valueOf(value);
                        break;
                    case FLOAT:
                        valueDefined = Float.valueOf(value);
                        break;
                    case BOOLEAN:
                        valueDefined = Boolean.valueOf(value);
                        break;
                    case LONG:
                        valueDefined = Long.valueOf(value);
                        break;
                    case COLOR:

                        if (value.matches("@color/.*")) {

                            try {
                                Class<?> c = Class.forName("com.github.fcannizzaro.material.Colors");
                                Object colors = c.getDeclaredField(value.replace("@color/", "")).get(c);
                                Method asColor = c.getMethod("asColor");
                                valueDefined = asColor.invoke(colors);

                            } catch (Exception e) {
                                System.out.println("ERROR Resourcer - Cannot bind " + value);
                            }

                        } else
                            valueDefined = Color.decode(value);
                        break;
                    }

                    values.get(node.getNodeName()).put(node.getAttribute("name"), valueDefined);

                }

            }
        }
}

From source file:io.github.wysohn.triggerreactor.tools.ReflectionUtil.java

public static void setFinalField(Class<?> clazz, Object obj, String fieldName, Object value)
        throws NoSuchFieldException {
    Field field = clazz.getDeclaredField(fieldName);

    setFinalField(obj, field, value);//from w w  w .  j av  a2  s . c  om
}