com.apitrary.api.client.util.ClassUtil Maven / Gradle / Ivy
/*
* Copyright 2012 Denis Neuling
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.apitrary.api.client.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/**
*
* ClassUtil class.
*
*
* @author Denis Neuling ([email protected])
*
*/
public class ClassUtil {
/**
*
* getClassAnnotationValue.
*
*
* @param source
* a {@link java.lang.Class} object.
* @param annotation
* a {@link java.lang.Class} object.
* @param attributeName
* a {@link java.lang.String} object.
* @param expected
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a T object.
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public static T getClassAnnotationValue(Class source, Class annotation, String attributeName, Class expected) {
Annotation instance = source.getAnnotation(annotation);
T value = null;
if (instance != null) {
try {
value = (T) instance.annotationType().getMethod(attributeName).invoke(instance);
} catch (Exception ex) {
}
}
return value;
}
/**
*
* getAnnotatedFields.
*
*
* @param object
* a {@link java.lang.Object} object.
* @param annotationClass
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a {@link java.util.List} object.
*/
public static List getAnnotatedFields(Object object, Class annotationClass) {
return getAnnotatedFields(object.getClass(), annotationClass);
}
/**
*
* getAnnotatedFields.
*
*
* @param clazz
* a {@link java.lang.Class} object.
* @param annotationClass
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a {@link java.util.List} object.
*/
public static List getAnnotatedFields(Class clazz, Class annotationClass) {
List annotatedFields = new LinkedList();
Field[] allFields = getAllDeclaredFields(clazz);
for (Field field : allFields) {
if (null != (field.getAnnotation(annotationClass))) {
annotatedFields.add(field);
}
}
return annotatedFields;
}
/**
*
* getAnnotatedFields.
*
*
* @param object
* a {@link java.lang.Object} object.
* @param annotationClasses
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a {@link java.util.List} object.
*/
public static List getAnnotatedFields(Object object, Class... annotationClasses) {
return getAnnotatedFields(object.getClass(), annotationClasses);
}
/**
*
* getAnnotatedFields.
*
*
* @param clazz
* a {@link java.lang.Class} object.
* @param annotationClasses
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a {@link java.util.List} object.
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public static List getAnnotatedFields(Class clazz, Class... annotationClasses) {
Set annotatedFields = new HashSet();
Field[] allFields = getAllDeclaredFields(clazz);
for (Class annotationClass : annotationClasses) {
for (Field field : allFields) {
if (null != (field.getAnnotation(annotationClass))) {
annotatedFields.add(field);
}
}
}
return new LinkedList(annotatedFields);
}
/**
*
* getAllDeclaredFields.
*
*
* @param clazz
* a {@link java.lang.Class} object.
* @return an array of {@link java.lang.reflect.Field} objects.
*/
public static Field[] getAllDeclaredFields(Class clazz) {
Field[] declaredFields = clazz.getDeclaredFields();
Class superClass = clazz.getSuperclass();
if (superClass != null && superClass != Object.class) {
declaredFields = ArrayUtil.concat(declaredFields, getAllDeclaredFields(superClass));
}
return declaredFields;
}
/**
*
* getValueOf.
*
*
* @param field
* a {@link java.lang.reflect.Field} object.
* @param reference
* a {@link java.lang.Object} object.
* @param referenceClazz
* a {@link java.lang.Class} object.
* @param referenceClazz
* a {@link java.lang.Class} object.
* @param valueType
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a T object.
*/
@SuppressWarnings("unchecked")
public static T getValueOf(Field field, Object reference, Class referenceClazz, Class valueType) {
try {
field.setAccessible(true);
Object toReturn = (T) field.get(reference);
if (String.class.isInstance(valueType.getClass()) && !String.class.isInstance(toReturn.getClass())) {
toReturn = toReturn.toString();
}
return (T) toReturn;
} catch (Exception e) {
return null;
}
}
/**
*
* getValueOf.
*
*
* @param fieldName
* a {@link java.lang.String} object.
* @param reference
* a {@link java.lang.Object} object.
* @param referenceClazz
* a {@link java.lang.Class} object.
* @param referenceClazz
* a {@link java.lang.Class} object.
* @param valueType
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a T object.
*/
public static T getValueOf(String fieldName, Object reference, Class referenceClazz, Class valueType) {
try {
Field field = referenceClazz.getDeclaredField(fieldName);
field.setAccessible(true);
@SuppressWarnings("unchecked")
T toReturn = (T) field.get(reference);
return toReturn;
} catch (Exception e) {
return null;
}
}
/**
*
* getValueOfField.
*
*
* @param field
* a {@link java.lang.reflect.Field} object.
* @param ref
* a {@link java.lang.Object} object.
* @return a {@link java.lang.Object} object.
*/
public static Object getValueOfField(Field field, Object ref) {
field.setAccessible(true);
Object value = null;
try {
value = field.get(ref);
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
}
return value;
}
/**
*
* newInstance.
*
*
* @param entity
* a {@link java.lang.Class} object.
* @return a {@link java.lang.Object} object.
*/
public static Object newInstance(Class entity) {
if (entity == null) {
return null;
}
try {
return entity.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
*
* setSilent.
*
*
* @param target
* a {@link java.lang.Object} object.
* @param fieldName
* a {@link java.lang.String} object.
* @param value
* a {@link java.lang.Object} object.
* @return a {@link java.lang.Object} object.
*/
public static Object setSilent(Object target, String fieldName, Object value) {
Class targetClass = target.getClass();
try {
Field field = targetClass.getDeclaredField(fieldName);
field.setAccessible(true);
field.set(target, box(value, field.getType()));
return target;
} catch (Exception e) {
return target;
}
}
/**
*
* box.
*
*
* @param property
* a {@link java.lang.Object} object.
* @param to
* a {@link java.lang.Class} object.
* @return a {@link java.lang.Object} object.
*/
public static Object box(Object property, Class to) {
if (property instanceof Exception) {
throw new RuntimeException((Exception) property);
}
if (property == null) {
return property;
}
if (property.getClass().equals(to)) {
return property;
}
if (property instanceof String && String.class.isAssignableFrom(to)) {
return property;
}
if ((property instanceof String || property instanceof Boolean) && Boolean.class.isAssignableFrom(to)) {
if (((String) property).equalsIgnoreCase("true") || property.equals("1")) {
return true;
}
if (((String) property).equalsIgnoreCase("false") || property.equals("0")) {
return false;
}
}
if ((property instanceof String || property instanceof Integer) && Integer.class.isAssignableFrom(to)) {
if (((String) property).isEmpty()) {
return 0;
}
return new Integer(property.toString());
}
if ((property instanceof String || property instanceof Integer || property instanceof Long) && Long.class.isAssignableFrom(to)) {
if (((String) property).isEmpty()) {
return 0L;
}
return new Long(property.toString());
}
if ((property instanceof String || property instanceof Double) && Double.class.isAssignableFrom(to)) {
if (((String) property).isEmpty()) {
return 0D;
}
return new Double(property.toString());
}
return to.cast(property);
}
/**
*
* getDeclaredFieldSilent.
*
*
* @param target
* a {@link java.lang.Class} object.
* @param fieldName
* a {@link java.lang.String} object.
* @return a {@link java.lang.reflect.Field} object.
*/
public static Field getDeclaredFieldSilent(Class target, String fieldName) {
try {
return target.getDeclaredField(fieldName);
} catch (Exception e) {
return null;
}
}
/**
*
* getFieldAnnotationValue.
*
*
* @param annotationProperty
* a {@link java.lang.String} object.
* @param field
* a {@link java.lang.reflect.Field} object.
* @param annotationClass
* a {@link java.lang.Class} object.
* @param ofType
* a {@link java.lang.Class} object.
* @param
* a T object.
* @return a T object.
*/
@SuppressWarnings("unchecked")
public static T getFieldAnnotationValue(String annotationProperty, Field field, Class annotationClass, Class ofType) {
Object annotation = field.getAnnotation(annotationClass);
T result = null;
if (annotation != null) {
try {
Method method = annotationClass.getMethod(annotationProperty, new Class[] {});
result = (T) method.invoke(annotation, new Object[] {});
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return result;
}
}
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