Example usage for java.lang Class getField

List of usage examples for java.lang Class getField

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Introduction

In this page you can find the example usage for java.lang Class getField.

Prototype

@CallerSensitive
public Field getField(String name) throws NoSuchFieldException, SecurityException

Source Link

Document

Returns a Field object that reflects the specified public member field of the class or interface represented by this Class object.

Usage

From source file:com.aliyun.openservices.odps.console.utils.CommandParserUtils.java

public static void printHelpInfo(List<String> keywords) {
    Map<String, Integer> matched = new HashMap<String, Integer>() {
    };//from w  w  w.java 2 s  .co  m
    List<String> allCommands = new ArrayList<String>();

    if (ecList == null) {
        ecList = PluginUtil.getExtendCommandList();
    }

    for (PluginPriorityCommand command : ecList) {
        allCommands.add(command.getCommandName());
    }

    for (String commandName : allCommands) {
        try {
            Class<?> commandClass = Class.forName(commandName, false, classLoader);
            Field tags_field = commandClass.getField(HELP_TAGS_FIELD);
            String[] tags = (String[]) tags_field.get(null);

            int count = 0;
            for (String tag : tags) {
                for (String keyword : keywords) {
                    if (tag.equalsIgnoreCase(keyword)) {
                        count++;
                        break;
                    }
                }
            }
            if (count != 0) {
                matched.put(commandName, count);
            }
        } catch (ClassNotFoundException e) {
            // Console??AssertionError
            //throw new AssertionError("Cannot find the command:" + commandName);
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            // Ignore
        } catch (IllegalAccessException e) {
            // Ignore
        }
    }

    // Print the help info of the command(s) whose tags match most keywords
    boolean found = false;
    System.out.println();
    for (int i = keywords.size(); i >= 1; i--) {
        for (Map.Entry<String, Integer> entry : matched.entrySet()) {
            if (i == entry.getValue()) {
                try {
                    Class<?> commandClass = Class.forName(entry.getKey(), false, classLoader);
                    Method printMethod = commandClass.getDeclaredMethod(HELP_PRINT_METHOD,
                            new Class<?>[] { PrintStream.class });
                    printMethod.invoke(null, System.out);
                    found = true;
                } catch (ClassNotFoundException e) {
                    // Console??AssertionError
                    throw new AssertionError("Cannot find the command:" + entry.getKey());
                } catch (NoSuchMethodException e) {
                    // Ignore
                } catch (IllegalAccessException e) {
                    // Ignore
                } catch (InvocationTargetException e) {
                    // Ignore
                }
            }
        }
        if (found) {
            break;
        }
    }
    System.out.println();
}

From source file:de.mpg.escidoc.pubman.util.InternationalizationHelper.java

/**
 * Return any bean stored in application scope under the specified name.
 * @param cls The bean class./*from   ww w. ja  v  a  2 s  .  c o m*/
 * @return the actual or new bean instance
 */
public static synchronized Object getApplicationBean(final Class<?> cls) {
    String name = null;

    try {
        name = (String) cls.getField("BEAN_NAME").get(new String());
        if (FacesBean.class.getName().equals(name)) {
            logger.warn("Bean class " + cls.getName() + " appears to have no individual BEAN_NAME.");
        }
    } catch (Exception e) {
        throw new RuntimeException("Error getting bean name of " + cls, e);
    }
    Object result = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get(name);

    logger.debug("Getting bean " + name + ": " + result);

    if (result == null) {
        try {
            logger.debug("Creating new application bean: " + name);
            Object newBean = cls.newInstance();
            FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().put(name, newBean);
            return newBean;
        } catch (Exception e) {
            throw new RuntimeException("Error creating new bean of type " + cls, e);
        }
    } else {
        return result;
    }
}

From source file:org.jdbcluster.JDBClusterUtil.java

/**
 * returns Filed object for Properties. Iterates over all superclasses Find
 * a Field with the given Field name and the given parameter types, declared
 * on the given class or one of its superclasses. Prefers public Field, but
 * will return a protected, package access, or private Field too.
 * <p>/*  w ww .j av a 2s .  c  om*/
 * Checks <code>Class.getField</code> first, falling back to
 * <code>getDeclaredField</code>.
 * 
 * @param propName
 *            path to property
 * @param c
 *            Class object
 * @return Field instance
 */
static public Field getField(String propName, Class clazz) {

    Assert.notNull(clazz, "clazz may not be null");
    Assert.hasLength(propName, "obj may not be null or \"\"");

    Field f = null;
    try {
        f = clazz.getField(propName);
    } catch (SecurityException e) {
        throw new ConfigurationException(
                "cant get field for property [" + propName + "] with the specified name for " + clazz.getName(),
                e);
    } catch (NoSuchFieldException e) {
        return JDBClusterUtil.getDeclaredField(propName, clazz);
    }
    return f;
}

From source file:it.nicola_amatucci.util.Json.java

public static <T> JSONObject json_from_object(Object o, Class<T> objClass) throws Exception {
    JSONObject json = new JSONObject();
    Field[] fields = objClass.getFields();
    try {//from  ww  w. ja  va  2  s.  c o m
        for (Field field : fields) {
            //valore del campo
            try {
                String typeName = field.getType().getSimpleName();

                //in base al tipo richiamo l'opportuna funzione
                if (typeName.equals("String") || typeName.equals("boolean") || typeName.equals("int")
                        || typeName.equals("long") || typeName.equals("double")) {
                    json.put(field.getName(), objClass.getField(field.getName()).get(o));
                } else if (typeName.equals("Date")) {
                    json.put(field.getName(), new SimpleDateFormat(Json.DATA_FORMAT)
                            .format((java.util.Date) objClass.getField(field.getName()).get(o)));
                } else if (field.getType().isArray()) {
                    try {
                        JSONArray array = new JSONArray();

                        Class c = Class.forName(field.getType().getName()).getComponentType();
                        Object[] objArray = (Object[]) objClass.getField(field.getName()).get(o);
                        for (int i = 0; i < objArray.length; i++) {
                            array.put(json_from_object(objArray[i], c));
                        }
                        json.put(field.getName(), array);
                    } catch (Exception e) {
                        throw e;
                    }
                } else {
                    JSONObject jsonObj = json_from_object(objClass.getField(field.getName()).get(o),
                            field.getType());
                    json.put(field.getName(), jsonObj);
                }

            } catch (Exception e) {
                throw e;
            }

        }
    } catch (Exception e) {
        throw e;
    }

    return json;
}

From source file:edu.cmu.cs.lti.util.uima.UimaConvenience.java

/**
 * Identifies the number of annotations of a given type in the specified JCas.
 * /* w ww  . j av a 2s.  c  om*/
 * @param aJCas
 * @param clazz
 * @return
 * @throws CASRuntimeException
 */
public static int numberOfAnnotations(final JCas aJCas, final Class clazz) throws CASRuntimeException {
    try {
        final int type = clazz.getField("type").getInt(clazz);
        return aJCas.getAnnotationIndex(type).size();
    } catch (SecurityException e) {
        throw new CASRuntimeException(e);
    } catch (IllegalAccessException e) {
        throw new CASRuntimeException(e);
    } catch (NoSuchFieldException e) {
        throw new CASRuntimeException(e);
    }
}

From source file:net.aepik.alasca.core.ldap.Schema.java

/**
 * Return syntaxes short name./*from   w  ww  .  ja  v  a  2  s .com*/
 */
public static String[] getSyntaxeNames(String[] names) {
    String[] syntaxes = names;
    try {
        String packageName = getSyntaxPackageName();
        for (int i = 0; i < syntaxes.length; i++) {
            Class object = Class.forName(packageName + "." + syntaxes[i]);
            Field field = object.getField("SHORTNAME");
            if (field != null) {
                syntaxes[i] = field.get(null).toString();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return syntaxes;
}

From source file:net.aepik.alasca.core.ldap.Schema.java

/**
 * Return a syntax object by name./*from w  w w  .j ava  2s  .com*/
 */
public static SchemaSyntax getSyntax(String name) {
    try {
        String packageName = getSyntaxPackageName();
        for (String syntaxe : getSyntaxes()) {
            Class object = Class.forName(packageName + "." + syntaxe);
            Field field = object.getField("SHORTNAME");
            if (field != null && name.equals(field.get(null).toString())) {
                @SuppressWarnings("unchecked")
                SchemaSyntax o = ((Class<SchemaSyntax>) Class.forName(packageName + "." + syntaxe))
                        .newInstance();
                return o;
            }
        }
        for (String syntaxe : getSyntaxes()) {
            if (name.equals(syntaxe)) {
                @SuppressWarnings("unchecked")
                SchemaSyntax o = ((Class<SchemaSyntax>) Class.forName(packageName + "." + syntaxe))
                        .newInstance();
                return o;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:org.eclipse.wb.internal.core.xml.model.property.editor.StaticFieldPropertyEditor.java

/**
 * Check field's, if field does not exist, then remove it from array.
 *///from  w w  w  . ja v  a2s. co  m
private static String[] cleanUpFieldDescriptions(Class<?> m_class, String[] fieldDescriptions)
        throws Exception {
    List<String> newFieldDescriptions = Lists.newArrayList();
    // check all fields
    for (String fieldDescription : fieldDescriptions) {
        // skip special cases
        if ("*remove".equals(fieldDescription)) {
            newFieldDescriptions.add(fieldDescription);
            continue;
        }
        // prepare field name
        String name = getFieldName(fieldDescription);
        // check exist field
        try {
            m_class.getField(name);
        } catch (NoSuchFieldException e) {
            continue;
        }
        // OK, valid field
        newFieldDescriptions.add(fieldDescription);
    }
    // return as array
    return newFieldDescriptions.toArray(new String[newFieldDescriptions.size()]);
}

From source file:com.evolveum.midpoint.prism.xml.XmlTypeConverter.java

public static <T> T toXmlEnum(Class<T> expectedType, String stringValue) {
    if (stringValue == null) {
        return null;
    }//w  ww  . ja  va  2  s .  c  o  m
    for (T enumConstant : expectedType.getEnumConstants()) {
        Field field;
        try {
            field = expectedType.getField(((Enum) enumConstant).name());
        } catch (SecurityException e) {
            throw new IllegalArgumentException(
                    "Error getting field from '" + enumConstant + "' in " + expectedType, e);
        } catch (NoSuchFieldException e) {
            throw new IllegalArgumentException(
                    "Error getting field from '" + enumConstant + "' in " + expectedType, e);
        }
        XmlEnumValue annotation = field.getAnnotation(XmlEnumValue.class);
        if (annotation.value().equals(stringValue)) {
            return enumConstant;
        }
    }
    throw new IllegalArgumentException("No enum value '" + stringValue + "' in " + expectedType);
}

From source file:org.eclipse.wb.internal.core.model.property.editor.StaticFieldPropertyEditor.java

/**
 * Check field's, if field does not exist, then remove it from array.
 *//*from ww w  . j a  v a 2s . co m*/
private static String[] cleanUpFieldDescriptions(IWarningConsumer logger, Class<?> m_class,
        String[] fieldDescriptions) throws Exception {
    List<String> newFieldDescriptions = Lists.newArrayList();
    // check all fields
    for (String fieldDescription : fieldDescriptions) {
        // skip special cases
        if ("*remove".equals(fieldDescription)) {
            newFieldDescriptions.add(fieldDescription);
            continue;
        }
        // prepare field name
        String name = getFieldName(fieldDescription);
        // check exist field
        try {
            m_class.getField(name);
        } catch (NoSuchFieldException e) {
            String message = MessageFormat.format("Can not find field {0}.{1}.", m_class.getName(), name);
            logger.addWarning(message, e);
            continue;
        }
        // OK, valid field
        newFieldDescriptions.add(fieldDescription);
    }
    // return as array
    return newFieldDescriptions.toArray(new String[newFieldDescriptions.size()]);
}