com.ginema.api.reflection.ReflectionUtils.java Source code

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Here is the source code for com.ginema.api.reflection.ReflectionUtils.java

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/*******************************************************************************
 * Copyright Mirko Calvaresi mccalv@gmail.com 2015
 *
 * 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.ginema.api.reflection;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;

import org.apache.commons.lang.ClassUtils;

/**
 * Utility class to handle basic reflection operation. The implementation is based on
 * {@link ClassUtils}
 * 
 * @author mccalv
 *
 */
@SuppressWarnings({ "unchecked", "rawtypes" })

public class ReflectionUtils {

    public static Stream<Field> getAnnotatedFields(Object a, Class annotation) {
        List<Field> declaredFields = new LinkedList<>(Arrays.asList(a.getClass().getDeclaredFields()));
        return declaredFields.stream().filter(p -> p.getAnnotation(annotation) != null);

    }

    public static Method getGetterMethod2(Class clazz, String name) throws IntrospectionException {

        PropertyDescriptor desc[] = Introspector.getBeanInfo(clazz, Object.class).getPropertyDescriptors();
        for (PropertyDescriptor d : desc) {
            return d.getReadMethod();
        }
        return null;
    }

    public static boolean isAssignableFrom(Class c, Set<Class> allowedClasses) {
        return allowedClasses.stream().filter(clazz -> ClassUtils.isAssignable(c, clazz, true)).findFirst()
                .isPresent();
    }

    public static boolean isAssignableFrom(Class c, Class clazz) {
        return ClassUtils.isAssignable(c, clazz, true);

    }

    public static boolean isACollection(Object c) {
        return ClassUtils.isAssignable(c.getClass(), Collection.class);
    }

    public static boolean isPrimitive(Object c) {
        return c.getClass().isPrimitive() || ClassUtils.wrapperToPrimitive(c.getClass()) != null;

    }

    public static <T extends Annotation> T getAnnotation(Object c, Class<T> annotationClass) {
        return c.getClass().getAnnotation(annotationClass);
    }

    public static boolean isAnnotatedWith(Object c, Class clazz) {
        return c.getClass().isAnnotationPresent(clazz);
    }

    public static <T> boolean isJDKClass(T t) {
        return t.getClass().getPackage().getName().startsWith("java");
    }
}