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:net.kamhon.ieagle.util.VoUtil.java

/**
 * To upperCase object String field/*from w  w  w  .j  a v  a 2 s  . c  o  m*/
 * 
 * @param all
 *            default is false. true means toUpperCase all String field, false toUpperCase the fields have
 *            net.kamhon.ieagle.vo.core.annotation.ToUpperCase.
 * 
 * @param objects
 */
public static void toUpperCaseProperties(boolean all, Object... objects) {
    for (Object object : objects) {
        if (object == null) {
            continue;
        }

        // getter for String field only
        Map<String, Method> getterMap = new HashMap<String, Method>();
        // setter for String field only
        Map<String, Method> setterMap = new HashMap<String, Method>();

        Class<?> clazz = object.getClass();

        Method[] methods = clazz.getMethods();

        for (Method method : methods) {
            /*
             * log.debug("method = " + method.getName());
             * log.debug("method.getParameterTypes().length = " +
             * method.getParameterTypes().length); if
             * (method.getParameterTypes().length == 1)
             * log.debug("method.getParameterTypes()[0] = " +
             * method.getParameterTypes()[0]);
             * log.debug("method.getReturnType() = " +
             * method.getReturnType());
             * log.debug("================================================="
             * );
             */
            if (method.getName().startsWith("get") && method.getParameterTypes().length == 0
                    && method.getReturnType().equals(String.class)) {

                // if method name is getXxx
                String fieldName = method.getName().substring(3);
                fieldName = fieldName.substring(0, 1).toLowerCase() + fieldName.substring(1);

                getterMap.put(fieldName, method);
            } else if (method.getName().startsWith("set") && method.getParameterTypes().length == 1
                    && method.getParameterTypes()[0] == String.class
                    && method.getReturnType().equals(void.class)) {
                // log.debug("setter = " + method.getName());

                // if method name is setXxx
                String fieldName = method.getName().substring(3);
                fieldName = fieldName.substring(0, 1).toLowerCase() + fieldName.substring(1);

                setterMap.put(fieldName, method);
            }
        }

        // if the key exists in both getter & setter
        for (String key : getterMap.keySet()) {
            if (setterMap.containsKey(key)) {
                try {
                    Method getterMethod = getterMap.get(key);
                    Method setterMethod = setterMap.get(key);

                    // if not all, check on Field
                    if (!all) {
                        Field field = null;

                        Class<?> tmpClazz = clazz;
                        // looping up to superclass to get decleared field
                        do {
                            try {
                                field = tmpClazz.getDeclaredField(key);
                            } catch (Exception ex) {
                                // do nothing
                            }

                            if (field != null) {
                                break;
                            }

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

                        ToUpperCase toUpperCase = field.getAnnotation(ToUpperCase.class);
                        if (toUpperCase == null || toUpperCase.upperCase() == false) {
                            continue;
                        }
                    }

                    String value = (String) getterMethod.invoke(object, new Object[] {});

                    if (StringUtils.isNotBlank(value))
                        setterMethod.invoke(object, value.toUpperCase());

                } catch (Exception ex) {
                    // log.error("Getter Setter for " + key + " has error ", ex);
                }
            }
        }
    }
}

---

From source file:gal.udc.fic.muei.tfm.dap.flipper.config.cassandra.CassandraProperties.java

/**
 * Parse the RetryPolicy policy.//  w w  w.j a  va2s.  co  m
 */
public static RetryPolicy parseRetryPolicy(String retryPolicyString)
        throws InstantiationException, IllegalAccessException, ClassNotFoundException, NoSuchMethodException,
        SecurityException, IllegalArgumentException, InvocationTargetException, NoSuchFieldException {

    if (!retryPolicyString.contains(".")) {
        retryPolicyString = "com.datastax.driver.core.policies." + retryPolicyString;
        Class<?> clazz = Class.forName(retryPolicyString);
        Field field = clazz.getDeclaredField("INSTANCE");
        RetryPolicy policy = (RetryPolicy) field.get(null);
        return policy;
    }
    return null;
}

---

From source file:com.datatorrent.stram.support.StramTestSupport.java

public static void setEnv(Map<String, String> newenv) throws Exception {
    try {//from   w w  w.ja v a 2s  . c o m
        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.putAll(newenv);
        Field theCaseInsensitiveEnvironmentField = processEnvironmentClass
                .getDeclaredField("theCaseInsensitiveEnvironment");
        theCaseInsensitiveEnvironmentField.setAccessible(true);
        Map<String, String> cienv = (Map<String, String>) theCaseInsensitiveEnvironmentField.get(null);
        cienv.putAll(newenv);
    } catch (NoSuchFieldException e) {
        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.putAll(newenv);
            }
        }
    }
}

---

From source file:com.app.server.util.ClassLoaderUtil.java

public static boolean cleanupJarFileFactory(CopyOnWriteArrayList setJarFileNames2Close) {
    boolean res = false;
    Class classJarURLConnection = null;
    try {//w  w w .ja  v a 2 s.  c o m
        classJarURLConnection = Class.forName("sun.net.www.protocol.jar.JarURLConnection");
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
    if (classJarURLConnection == null) {
        return res;
    }
    Field f = null;
    try {
        f = classJarURLConnection.getDeclaredField("factory");
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    }
    if (f == null) {
        return res;
    }
    f.setAccessible(true);
    Object obj = null;
    try {
        obj = f.get(null);
    } catch (IllegalAccessException e) {
        // ignore
    }
    if (obj == null) {
        return res;
    }
    Class classJarFileFactory = obj.getClass();
    //
    HashMap fileCache = null;
    try {
        f = classJarFileFactory.getDeclaredField("fileCache");
        f.setAccessible(true);
        obj = f.get(null);
        if (obj instanceof HashMap) {
            fileCache = (HashMap) obj;
        }
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
    HashMap urlCache = null;
    try {
        f = classJarFileFactory.getDeclaredField("urlCache");
        f.setAccessible(true);
        obj = f.get(null);
        if (obj instanceof HashMap) {
            urlCache = (HashMap) obj;
        }
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
    if (urlCache != null) {
        HashMap urlCacheTmp = (HashMap) urlCache.clone();
        Iterator it = urlCacheTmp.keySet().iterator();
        while (it.hasNext()) {
            obj = it.next();
            if (!(obj instanceof JarFile)) {
                continue;
            }
            JarFile jarFile = (JarFile) obj;
            if (setJarFileNames2Close.contains(jarFile.getName().trim().toUpperCase())) {
                try {
                    jarFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (fileCache != null) {
                    fileCache.remove(jarFile);
                }
                urlCache.remove(jarFile);
            }
        }
        res = true;
    } else if (fileCache != null) {
        // urlCache := null
        HashMap fileCacheTmp = (HashMap) fileCache.clone();
        Iterator it = fileCacheTmp.keySet().iterator();
        while (it.hasNext()) {
            Object key = it.next();
            obj = fileCache.get(key);
            if (!(obj instanceof JarFile)) {
                continue;
            }
            JarFile jarFile = (JarFile) obj;

            try {
                jarFile.close();
            } catch (IOException e) {
                // ignore
            }
            fileCache.remove(key);

        }
        res = true;
    }
    setJarFileNames2Close.clear();
    return res;
}

---

From source file:at.ac.tuwien.infosys.jcloudscale.utility.ReflectionUtil.java

public static Field findField(Class<?> type, String fieldName) throws NoSuchFieldException, SecurityException {

    if (type.equals(Object.class)) {
        return type.getDeclaredField(fieldName);
    }/*ww w  .  j  av a 2  s  .  c  om*/

    // now that's an ugly construct :)
    Field field = null;
    try {
        field = type.getDeclaredField(fieldName);
    } catch (NoSuchFieldException e) {
        field = findField(type.getSuperclass(), fieldName);
    }

    return field;

}

---

From source file:gov.nih.nci.caarray.dao.SampleDaoImpl.java

private static String getDiscriminator(Class<? extends AbstractBioMaterial> bmClass) {
    String errorMsg = "Not a valid biomaterial class (no DISCRIMINATOR field): ";
    try {//from   w w  w  .  ja  va2s.c  o  m
        Field discField = bmClass.getDeclaredField("DISCRIMINATOR");
        return (String) discField.get(null);
    } catch (SecurityException e) {
        throw new IllegalArgumentException(errorMsg + bmClass, e);
    } catch (NoSuchFieldException e) {
        throw new IllegalArgumentException(errorMsg + bmClass, e);
    } catch (IllegalArgumentException e) {
        throw new IllegalArgumentException(errorMsg + bmClass, e);
    } catch (IllegalAccessException e) {
        throw new IllegalArgumentException(errorMsg + bmClass, e);
    }
}

---

From source file:com.gigaspaces.internal.utils.ClassLoaderCleaner.java

private static void clearRmiLoaderHandler(ClassLoader classLoader) {
    // HACK: Clear it from the RMI class loader as well
    // We can safely remove this since we no longer have this class loader around
    // and the table key is based on the class loader
    try {/* ww  w .  j  a  v a  2 s  .  c o  m*/
        final Class<?> loaderHandlerClass = classLoader.loadClass("sun.rmi.server.LoaderHandler");
        synchronized (loaderHandlerClass) {
            Field loadTableField = loaderHandlerClass.getDeclaredField("loaderTable");
            loadTableField.setAccessible(true);
            Map<?, ?> loaderTable = (Map<?, ?>) loadTableField.get(null);
            for (Iterator it = loaderTable.entrySet().iterator(); it.hasNext();) {
                Map.Entry<?, ?> entry = (Map.Entry<?, ?>) it.next();
                Object loaderKey = entry.getKey();
                Field parentField = loaderKey.getClass().getDeclaredField("parent");
                parentField.setAccessible(true);
                if (parentField.get(loaderKey) == classLoader) {
                    it.remove();
                }
            }
        }
    } catch (Throwable t) {
        // ignore
    }
}

---

From source file:eu.vital.vitalcep.restApp.alert.Alerts.java

public static int getPid(Process process) {
    try {/*from w  w w  .j a v a 2s .co m*/
        Class<?> cProcessImpl = process.getClass();
        java.lang.reflect.Field fPid = cProcessImpl.getDeclaredField("pid");
        if (!fPid.isAccessible()) {
            fPid.setAccessible(true);
        }
        return fPid.getInt(process);
    } catch (Exception e) {
        return -1;
    }
}

---

From source file:Mopex.java

/**
 * Finds the first (from the bottom of the inheritance hierarchy) field with
 * the specified name. Note that Class.getField returns only public fields.
 * //from  ww  w. ja  v  a2  s  .  co  m
 * @return Field
 * @param cls
 *            java.lang.Class
 * @param name
 *            String
 */
//start extract findField
public static Field findField(Class cls, String name) throws NoSuchFieldException {
    if (cls != null) {
        try {
            return cls.getDeclaredField(name);
        } catch (NoSuchFieldException e) {
            return findField(cls.getSuperclass(), name);
        }
    } else {
        throw new NoSuchFieldException();
    }
}

---

From source file:com.oneis.javascript.Runtime.java

private static void checkJavaScriptTimeZoneIsGMT() {
    // Check that the timezone is GMT - datetime.js has created a Date object to run static initializers.
    // This is specific to the exact version of the Rhino implementation, but should fail gracefully if it's changed.
    boolean nativeDateTimeZoneOK = false;
    try {/*  w ww .  j  a v a 2 s . c  o m*/
        java.lang.Class nativeDate = java.lang.Class.forName("org.mozilla.javascript.NativeDate");
        java.lang.reflect.Field nativeDateTimeZoneField = nativeDate.getDeclaredField("thisTimeZone");
        nativeDateTimeZoneField.setAccessible(true);
        java.util.TimeZone tz = (java.util.TimeZone) nativeDateTimeZoneField.get(null);
        java.lang.reflect.Field nativeDateLocalTZAField = nativeDate.getDeclaredField("LocalTZA");
        nativeDateLocalTZAField.setAccessible(true);
        if (tz != null && (tz.getID().equals("GMT0") || tz.getID().equals("GMT") || tz.getID().equals("UTC"))
                && nativeDateLocalTZAField.getDouble(null) == 0.0) {
            nativeDateTimeZoneOK = true;
        }
    } catch (Exception e) {
        // Ignore, nativeDateTimeZoneOK won't be set to true.
    }
    if (!nativeDateTimeZoneOK) {
        System.out.println("\n\nThe operating system's time zone must be set to GMT (GMT0 Java TimeZone).\n");
        throw new RuntimeException("JavaScript interpreter's local time zone is not GMT (GMT0 Java TimeZone).");
    }
}

---

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