001/*
002 * Copyright (C) 2023-present 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;
020import io.prometheus.jmx.common.yaml.YamlMapAccessor;
021import java.util.Map;
022import java.util.function.Function;
023import java.util.function.Supplier;
024
025/**
026 * Class to convert an Object to a Map, throwing a RuntimeException from the Supplier if there is a
027 * ClassCastException
028 */
029@SuppressWarnings("unchecked")
030public class ConvertToMapAccessor implements Function<Object, YamlMapAccessor> {
031
032    private final Supplier<? extends RuntimeException> supplier;
033
034    /**
035     * Constructor
036     *
037     * @param supplier supplier
038     */
039    public ConvertToMapAccessor(Supplier<? extends RuntimeException> supplier) {
040        Precondition.notNull(supplier);
041        this.supplier = supplier;
042    }
043
044    /**
045     * Method to apply a function
046     *
047     * @param value value
048     * @return the return value
049     */
050    @Override
051    public YamlMapAccessor apply(Object value) {
052        try {
053            return new YamlMapAccessor((Map<Object, Object>) value);
054        } catch (ClassCastException e) {
055            throw supplier.get();
056        }
057    }
058}