com.athaydes.protobuf.tcp.internal.Utils Maven / Gradle / Ivy

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package com.athaydes.protobuf.tcp.internal;

import com.athaydes.protobuf.tcp.api.ServicePropertyReader;
import java.io.Closeable;
import java.io.IOException;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalInt;

/**
 * A few stateless, helper functions.
 */
public final class Utils implements ServicePropertyReader {

    @Override
    public Optional getStringFrom(Map map, String key) {
        return Optional.ofNullable(map.get(key)).map(Object::toString);
    }

    @Override
    public OptionalInt getIntFrom(Map map, String key)
            throws NumberFormatException {
        Optional optInt = Optional.ofNullable(map.get(key))
                .map(Object::toString)
                .map(Integer::parseInt);
        return optInt.map(OptionalInt::of).orElseGet(OptionalInt::empty);
    }

    public static void closeQuietly(Closeable closeable) {
        try {
            closeable.close();
        } catch (IOException e) {
            // ignore
        }
    }

    public static Class[] appendIfNotPresent(Class[] classes, Class type) {
        for (Class item : classes) {
            if (item.equals(type)) {
                return classes;
            }
        }
        Class[] result = new Class[classes.length + 1];
        System.arraycopy(classes, 0, result, 0, classes.length);
        result[classes.length] = type;
        return result;
    }

}