org.apache.sshd.common.util.ReflectionUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 34.0.0.Final

Show newest version

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.sshd.common.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.function.Function;
import java.util.function.Predicate;

/**
 * @author Apache MINA SSHD Project
 */
public final class ReflectionUtils {
    public static final Function FIELD_NAME_EXTRACTOR = f -> (f == null) ? null : f.getName();

    private ReflectionUtils() {
        throw new UnsupportedOperationException("No instance");
    }

    public static Collection getMatchingFields(Class clazz, Predicate acceptor) {
        return GenericUtils.selectMatchingMembers(acceptor, clazz.getFields());
    }

    public static Collection getMatchingDeclaredFields(Class clazz, Predicate acceptor) {
        return GenericUtils.selectMatchingMembers(acceptor, clazz.getDeclaredFields());
    }

    /**
     * Checks whether a given {@link ClassLoader} can load a class.
     *
     * @param      cl        {@link ClassLoader} to use
     * @param      className to check
     * @return               {@code true} if the class loader can load the class, {@code false} otherwise
     * @deprecated           The preferred method is
     *                       {@link org.apache.sshd.common.util.threads.ThreadUtils#resolveDefaultClass(Class, String)}
     *                       which checks all possible ClassLoaders.
     */
    @Deprecated
    public static boolean isClassAvailable(ClassLoader cl, String className) {
        try {
            cl.loadClass(className);
            return true;
        } catch (Throwable ignored) {
            return false;
        }
    }

    public static Object newInstance(Class clazz) throws ReflectiveOperationException {
        return newInstance(clazz, Object.class);
    }

    @SuppressWarnings("checkstyle:ThrowsCount")
    public static  T newInstance(Class clazz, Class castType) throws ReflectiveOperationException {
        Constructor ctor = clazz.getDeclaredConstructor();
        Object instance = ctor.newInstance();
        return castType.cast(instance);
    }
}