org.kie.api.internal.utils.ServiceUtil Maven / Gradle / Ivy

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The Kogito public API which is backwards compatible between releases.

There is a newer version: 10.0.0

/*
 * Copyright 2005 JBoss Inc
 *
 * 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 org.kie.api.internal.utils;

import java.util.Arrays;
import java.util.Optional;
import java.util.stream.Stream;

public class ServiceUtil {

    public static  T instanceFromNames( String... impls ) {
        return (T) Stream.of( impls )
                .map( ServiceUtil::instance )
                .filter( Optional::isPresent )
                .map( Optional::get )
                .findFirst()
                .orElseThrow( () -> new RuntimeException( "Unable to find any instance of classes: " + Arrays.toString( impls ) ) );
    }

    private static Optional instance( String className ) {
        try {
            return Optional.of( Class.forName(className).newInstance() );
        } catch (Exception e) {
            return Optional.empty();
        }
    }
}