internal.io.text.FunctionalTextParser Maven / Gradle / Ivy

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package internal.io.text;

import lombok.NonNull;
import nbbrd.io.function.IOFunction;
import nbbrd.io.text.TextParser;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.Objects;

import static nbbrd.io.Resource.uncloseableInputStream;
import static nbbrd.io.text.TextResource.uncloseableReader;

@lombok.RequiredArgsConstructor
public final class FunctionalTextParser implements TextParser {
    
    private final @NonNull IOFunction function;

    @Override
    public @NonNull T parseReader(@NonNull Reader resource) throws IOException {
        return doParse(uncloseableReader(resource));
    }

    @Override
    public @NonNull T parseStream(@NonNull InputStream resource, @NonNull Charset encoding) throws IOException {
        try (InputStreamReader reader = new InputStreamReader(uncloseableInputStream(resource), encoding)) {
            return doParse(reader);
        }
    }

    private T doParse(Reader reader) throws IOException {
        return Objects.requireNonNull(function.applyWithIO(reader), "result");
    }
}