com.turn.camino.config.ConfigUtil.java Source code

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Here is the source code for com.turn.camino.config.ConfigUtil.java

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/**
 * Copyright (C) 2014-2016, Turn Inc. All Rights Reserved.
 *
 * 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
 */
package com.turn.camino.config;

import com.google.common.collect.Lists;

import java.util.List;
import java.util.Map;

/**
 * Utility methods for reading config
 */
public class ConfigUtil {

    /**
     * Interface for transforming a key/value pair into an object
     */
    interface Transformer<K, V, T> {
        T transform(K key, V value);
    }

    /**
     * Transforms map of key/values to list of objects
     *
     * @param map map of key/value pairs
     * @param transformer transformation logic
     * @return list of objects
     */
    public static <K, V, T> List<T> mapToList(Map<K, V> map, Transformer<K, V, T> transformer) {
        List<T> list = Lists.newArrayListWithCapacity(map.size());
        for (Map.Entry<K, V> entry : map.entrySet()) {
            list.add(transformer.transform(entry.getKey(), entry.getValue()));
        }
        return list;
    }

}