src/java.base/share/classes/sun/net/ResolverProviderConfiguration.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * by Oracle in the LICENSE file that accompanied this code.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package sun.net;

import java.net.spi.InetAddressResolver;
import java.net.spi.InetAddressResolverProvider;
import java.util.function.Supplier;

public final class ResolverProviderConfiguration implements
        InetAddressResolverProvider.Configuration {

    private final InetAddressResolver builtinResolver;
    private final Supplier<String> localHostNameSupplier;

    public ResolverProviderConfiguration(InetAddressResolver builtinResolver,
                                         Supplier<String> localHostNameSupplier) {
        this.builtinResolver = builtinResolver;
        this.localHostNameSupplier = localHostNameSupplier;
    }

    @Override
    public InetAddressResolver builtinResolver() {
        return builtinResolver;
    }

    @Override
    public String lookupLocalHostName() {
        return localHostNameSupplier.get();
    }
}