org.web3j.openapi.server.console.defaultproviders.CascadingDefaultProvider.kt Maven / Gradle / Ivy

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/*
 * Copyright 2020 Web3 Labs Ltd.
 *
 * 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.web3j.openapi.server.console.defaultproviders

import picocli.CommandLine.IDefaultValueProvider
import picocli.CommandLine.Model.ArgSpec

internal class CascadingDefaultProvider(
    private vararg val defaultProviders: IDefaultValueProvider
) : IDefaultValueProvider {

    override fun defaultValue(argSpec: ArgSpec): String? {
        for (defaultProvider in defaultProviders) {
            val value = defaultProvider.defaultValue(argSpec)
            if (value != null && value.isNotEmpty()) return value
        }
        return null
    }
}