Example usage for java.lang.reflect Method invoke

Introduction

In this page you can find the example usage for java.lang.reflect Method invoke.

Prototype

@CallerSensitive
@ForceInline 
@HotSpotIntrinsicCandidate
public Object invoke(Object obj, Object... args)
        throws IllegalAccessException, IllegalArgumentException, InvocationTargetException 

Source Link

Document

Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.

Usage

From source file:Main.java

private static Object invokeMethod(Object handler, String callback, boolean fallback, Class<?>[] cls,
        Class<?>[] cls2, Object... params) throws Exception {

    if (handler == null || callback == null)
        return null;

    Method method = null;

    try {//from   w w w.  j  a v  a 2 s . co m
        if (cls == null)
            cls = new Class[0];
        method = handler.getClass().getMethod(callback, cls);
        return method.invoke(handler, params);
    } catch (NoSuchMethodException e) {
        //AQUtility.debug(e.getMessage());
    }

    try {
        if (fallback) {

            if (cls2 == null) {
                method = handler.getClass().getMethod(callback);
                return method.invoke(handler);
            } else {
                method = handler.getClass().getMethod(callback, cls2);
                return method.invoke(handler, params);
            }

        }
    } catch (NoSuchMethodException e) {
    }

    return null;

}

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From source file:Main.java

/**
 * Computes the maximum bounds of the current screen device. If this method is
 * called on JDK 1.4, Xinerama-aware results are returned. (See Sun-Bug-ID
 * 4463949 for details).//  w w  w. j a  v a  2  s . co  m
 * 
 * @return the maximum bounds of the current screen.
 */
public static Rectangle getMaximumWindowBounds() {
    final GraphicsEnvironment localGraphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
    try {
        final Method method = GraphicsEnvironment.class.getMethod("getMaximumWindowBounds", (Class[]) null);
        return (Rectangle) method.invoke(localGraphicsEnvironment, (Object[]) null);
    } catch (Exception e) {
        // ignore ... will fail if this is not a JDK 1.4 ..
    }

    final Dimension s = Toolkit.getDefaultToolkit().getScreenSize();
    return new Rectangle(0, 0, s.width, s.height);
}

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From source file:Main.java

/**
 * invoke the leftParameter and get the name property.
 * it will try the Array.length() and Map.get(),
 * then it will try get'Name' and is'Name',
 * last, it will to find the name by invoke field.
 *///w w  w . ja v a2s  . c om
public static Object searchProperty(Object leftParameter, String name) throws Exception {
    Class<?> leftClass = leftParameter.getClass();
    Object result;
    if (leftParameter.getClass().isArray() && "length".equals(name)) {
        result = Array.getLength(leftParameter);
    } else if (leftParameter instanceof Map) {
        result = ((Map<Object, Object>) leftParameter).get(name);
    } else {
        try {
            String getter = "get" + name.substring(0, 1).toUpperCase() + name.substring(1);
            Method method = leftClass.getMethod(getter, new Class<?>[0]);
            if (!method.isAccessible()) {
                method.setAccessible(true);
            }
            result = method.invoke(leftParameter, new Object[0]);
        } catch (NoSuchMethodException e2) {
            try {
                String getter = "is" + name.substring(0, 1).toUpperCase() + name.substring(1);
                Method method = leftClass.getMethod(getter, new Class<?>[0]);
                if (!method.isAccessible()) {
                    method.setAccessible(true);
                }
                result = method.invoke(leftParameter, new Object[0]);
            } catch (NoSuchMethodException e3) {
                Field field = leftClass.getField(name);
                result = field.get(leftParameter);
            }
        }
    }
    return result;
}

---

From source file:Main.java

public static void putTextToViewById(Activity a, int id, int text) {

    View view = a.findViewById(id);

    Method m = null;

    try {/* w w  w.j  a  v  a2s  . co m*/
        m = view.getClass().getMethod("setText", new Class[] { Integer.TYPE });
    } catch (NoSuchMethodException e) {

    }
    if (m != null) {
        try {
            m.invoke(view, text);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

---

From source file:Main.java

public static boolean hasSystemFeature(final Context pContext, final String pFeature) {
    try {//from  ww w  .  j a va2s .  com
        final Method PackageManager_hasSystemFeatures = PackageManager.class.getMethod("hasSystemFeature",
                new Class[] { String.class });
        return (PackageManager_hasSystemFeatures == null) ? false
                : (Boolean) PackageManager_hasSystemFeatures.invoke(pContext.getPackageManager(), pFeature);
    } catch (final Throwable t) {
        return false;
    }
}

---

From source file:com.armon.test.quartz.QuartzConfiguration.java

/**
 * Get the password from the Configuration instance using the
 * getPassword method if it exists. If not, then fall back to the
 * general get method for configuration elements.
 * @param conf configuration instance for accessing the passwords
 * @param alias the name of the password element
 * @param defPass the default password//from w  ww . j  a v a2  s  .c  o m
 * @return String password or default password
 * @throws IOException
 */
public static String getPassword(Configuration conf, String alias, String defPass) throws IOException {
    String passwd = null;
    try {
        Method m = Configuration.class.getMethod("getPassword", String.class);
        char[] p = (char[]) m.invoke(conf, alias);
        if (p != null) {
            LOG.debug(String.format(
                    "Config option \"%s\" was found through" + " the Configuration getPassword method.",
                    alias));
            passwd = new String(p);
        } else {
            LOG.debug(String.format("Config option \"%s\" was not found. Using provided default value", alias));
            passwd = defPass;
        }
    } catch (NoSuchMethodException e) {
        // this is a version of Hadoop where the credential
        //provider API doesn't exist yet
        LOG.debug(String
                .format("Credential.getPassword method is not available." + " Falling back to configuration."));
        passwd = conf.get(alias, defPass);
    } catch (SecurityException e) {
        throw new IOException(e.getMessage(), e);
    } catch (IllegalAccessException e) {
        throw new IOException(e.getMessage(), e);
    } catch (IllegalArgumentException e) {
        throw new IOException(e.getMessage(), e);
    } catch (InvocationTargetException e) {
        throw new IOException(e.getMessage(), e);
    }
    return passwd;
}

---

From source file:main.java.stroum.vkapp.VK.LongPoll.java

private static void processEvent(JSONArray array, String className) {
    for (int i = 0; i < array.length(); ++i) {
        try {// ww w.  j a v  a 2 s.co  m
            JSONArray arrayItem = (JSONArray) array.get(i);
            int type = (Integer) arrayItem.get(0);
            int uid;

            /*
            0,$message_id,0 --  ?? ?  local_id
            1,$message_id,$flags --   ?? (FLAGS:=$flags)
            2,$message_id,$mask[,$user_id] -- ?  ?? (FLAGS|=$mask)
            3,$message_id,$mask[,$user_id] -- ??  ?? (FLAGS&=~$mask)
            4,$message_id,$flags,$from_id,$timestamp,$subject,$text,$attachments --   ??
            8,-$user_id,0 --  $user_id ? 
            9,-$user_id,$flags --  $user_id ?  ($flags  0, ?   ? (,  )  1, ?    (, ?? away))
                    
                    
            51,$chat_id,$self --    (??, ) ? $chat_id  . $self -   ?  ? 
            61,$user_id,$flags --  $user_id   ?  . ?     ~5 ?  ??  ?. $flags = 1
            62,$user_id,$chat_id --  $user_id   ?  ? $chat_id.
            70,$user_id,$call_id --  $user_id ?    $call_id,       ??  voip.getCallInfo.
            */

            switch (type) {
            case 8:
                // uid = Math.abs(Integer.parseInt(arrayItem.get(1).toString()));
                // System.out.println(VK.getUserName(uid) + " is online");
                break;
            case 9:
                // uid = Math.abs(Integer.parseInt(arrayItem.get(1).toString()));
                //System.out.println(VK.getUserName(uid) + " is offline");
                break;
            case 4:
                Long message_id = Long.parseLong(arrayItem.get(1).toString());
                int flags = Integer.parseInt(arrayItem.get(2).toString());
                int from_id = Integer.parseInt(arrayItem.get(3).toString());
                Long ts = Long.parseLong(arrayItem.get(4).toString());
                String subject = arrayItem.get(5).toString();
                String text = arrayItem.get(6).toString();
                int from_uid = 0;
                try {
                    JSONObject object = new JSONObject(arrayItem.get(7).toString());
                    from_uid = Integer.parseInt(object.getString("from"));
                } catch (Exception ignored) {
                }

                try {
                    Class c = Class.forName("main.java.stroum.vkapp.Handlers." + className); // Todo: Fix
                    Class[] paramTypes = new Class[] { Message.class };
                    Object[] args = new Object[] {
                            new Message(message_id, flags, from_id, ts, text, from_uid) };
                    Method m = c.getMethod("handleMessage", paramTypes);
                    m.invoke(c, args);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            }

        } catch (JSONException ignored) {
        }
    }
}

---

From source file:biz.wolschon.finance.jgnucash.actions.FileBugInBrowserAction.java

/**
 * @return instance of "javax.jnlp.ServiceManager" on platforms
 * that support it.//from   w  w  w. ja  v a 2 s .  com
 */
@SuppressWarnings("unchecked")
private static Object getJNLPServiceManagerObject() {
    try {
        Class serviceManagerClass = Class.forName("javax.jnlp.ServiceManager");
        Method lookupMethod = serviceManagerClass.getMethod("lookup", new Class[] { String.class });
        return lookupMethod.invoke(null, new Object[] { "javax.jnlp.BasicService" });
    } catch (Exception ex) {
        LOGGER.info(
                "Cannot instanciate javax.jnlp.ServiceManager " + "- this platform seems not to support it.",
                ex);
        return null;
    }
}

---

From source file:Main.java

/**
 * Applies stirng to View by Reflection/*from   w  ww.ja v  a  2  s  .co  m*/
 *
 * @param context      Context
 * @param view         View to apply to.
 * @param attrs        Attributes of Layout
 */
public static void applyResourceStringToView(Context context, View view, AttributeSet attrs) {
    if (attrs != null) {
        Resources res = context.getResources();
        for (int i = 0; i < attrs.getAttributeCount(); i++) {
            int resId = attrs.getAttributeResourceValue(i, 0);
            if (resId > 0) {
                String resType = res.getResourceTypeName(resId);
                if (resType.equals("string")) {
                    String attrName = attrs.getAttributeName(i);
                    try {
                        Method method = view.getClass().getMethod("set" + capitalize(attrName),
                                CharSequence.class);
                        method.setAccessible(true);
                        method.invoke(view, res.getString(resId));
                    } catch (NoSuchMethodException e) {
                    } catch (Exception e) {
                    }
                }
            }
        }
    }
}

---

From source file:jin.collection.util.PropertyUtil.java

static Object getMethodResult(final Object element, final String methodName, final Object param)
        throws Exception {

    Class[] classes = null;/* w w  w.j a va  2s  .co  m*/
    Object[] params = null;
    if (param != null) {
        classes = new Class[] { param.getClass() };
        params = new Object[] { param };
    }

    // TODO: sistemare
    final Method m = element.getClass().getMethod(methodName, classes);
    m.setAccessible(true);
    return m.invoke(element, params);
}

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