com.exactpro.th2.codec.util.ServiceLoaderUtil.kt Maven / Gradle / Ivy

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/*
 * Copyright 2020-2022 Exactpro (Exactpro Systems Limited)
 *
 * 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.exactpro.th2.codec.util

import java.util.ServiceLoader

inline fun  load(): T {
    val instances = ServiceLoader.load(T::class.java).toList()

    return when (instances.size) {
        0 -> error("No instances of ${T::class.simpleName}")
        1 -> instances.first()
        else -> error("More than 1 instance of ${T::class.simpleName} has been found: $instances")
    }
}