001/*
002 * Copyright (C) 2023 The Prometheus jmx_exporter Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package io.prometheus.jmx.common.configuration;
018
019import io.prometheus.jmx.common.util.Precondition;
020
021import java.util.function.Function;
022import java.util.function.Supplier;
023
024public class ConvertToString implements Function<Object, String> {
025
026    private Supplier<? extends RuntimeException> supplier;
027
028    /**
029     * Constructor
030     *
031     * @param supplier supplier
032     */
033    public ConvertToString(Supplier<? extends RuntimeException> supplier) {
034        Precondition.notNull(supplier);
035        this.supplier = supplier;
036    }
037
038    /**
039     * Method to apply a function
040     *
041     * @param value value
042     * @return the return value
043     */
044    @Override
045    public String apply(Object value) {
046        if (value == null) {
047            throw new IllegalArgumentException();
048        }
049
050        try {
051            return (String) value;
052        } catch (Throwable t) {
053            throw supplier.get();
054        }
055    }
056}