org.kametic.specifications.reflect.ClassMethodsAnnotatedWith.java Source code

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Here is the source code for org.kametic.specifications.reflect.ClassMethodsAnnotatedWith.java

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/**
 * Copyright (C) 2013 Kametic <epo.jemba@kametic.com>
 *
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007;
 * or any later version
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * 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 org.kametic.specifications.reflect;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang.ArrayUtils;
import org.kametic.specifications.AbstractSpecification;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ClassMethodsAnnotatedWith extends AbstractSpecification<Class<?>> {

    Logger logger = LoggerFactory.getLogger(ClassMethodsAnnotatedWith.class);

    private MethodAnnotatedWith methodAnnotatedWith;

    public ClassMethodsAnnotatedWith(Class<? extends Annotation> annotation) {
        methodAnnotatedWith = new MethodAnnotatedWith(annotation);
    }

    @Override
    public boolean isSatisfiedBy(Class<?> candidate) {
        if (null != candidate) {
            try {

                Class<?>[] clazzes = getAllInterfacesAndClasses(candidate);

                for (Class<?> clazz : clazzes) {
                    for (Method method : clazz.getDeclaredMethods()) {
                        if (methodAnnotatedWith.isSatisfiedBy(method)) {
                            return true;
                        }
                    }
                }

            } catch (Throwable cnfe) {
                logger.warn("Exception on isSatisfiedBy () " + cnfe.getMessage());
            }
        }

        return false;
    }

    Class<?>[] getAllInterfacesAndClasses(Class<?> clazz) {
        return getAllInterfacesAndClasses(new Class[] { clazz });
    }

    //This method walks up the inheritance hierarchy to make sure we get every class/interface that could
    //possibly contain the declaration of the annotated method we're looking for.
    @SuppressWarnings("unchecked")
    Class<?>[] getAllInterfacesAndClasses(Class<?>[] classes) {
        if (0 == classes.length) {
            return classes;
        } else {
            List<Class<?>> extendedClasses = new ArrayList<Class<?>>();
            // all interfaces hierarchy
            for (Class<?> clazz : classes) {
                if (clazz != null) {
                    Class<?>[] interfaces = clazz.getInterfaces();
                    if (interfaces != null) {
                        extendedClasses.addAll((List<? extends Class<?>>) Arrays.asList(interfaces));
                    }
                    Class<?> superclass = clazz.getSuperclass();
                    if (superclass != null && superclass != Object.class) {
                        extendedClasses.addAll((List<? extends Class<?>>) Arrays.asList(superclass));
                    }
                }
            }

            //Class::getInterfaces() gets only interfaces/classes implemented/extended directly by a given class.
            //We need to walk the whole way up the tree.
            return (Class[]) ArrayUtils.addAll(classes,
                    getAllInterfacesAndClasses(extendedClasses.toArray(new Class[extendedClasses.size()])));
        }
    }

}