import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.Charset;

/**
 * A destination to which bytes can be written, such as a file. Unlike an {@link OutputStream}, a
 * {@code ByteSink} is not an open, stateful stream that can be written to and closed. Instead, it
 * is an immutable <i>supplier</i> of {@code OutputStream} instances.
 *

    private final Map<String, String> systemProperties;
    private final Path topDirectory;
    private final Path rootDirectory;

    private final InputStream in;
    private final OutputStream out;
    private final OutputStream err;
    private final List<CoreExtension> coreExtensions;

    @SuppressWarnings("ParameterNumber")
    public BaseInvokerRequest(
            @Nonnull ParserRequest parserRequest,

     * @return the output stream, or null if not set
     */
    @Nullable
    OutputStream out();

    /**
     * Returns the error stream to be used for the Maven execution.
     * If not set, System.err will be used by default.
     *
     * @return the error stream, or null if not set
     */
    @Nullable
    OutputStream err();

    /**

        Path path = request.getPath();
        OutputStream outputStream = request.getOutputStream();
        Writer writer = request.getWriter();
        if (writer == null && outputStream == null && path == null) {
            throw new IllegalArgumentException("writer, outputStream or path must be non null");
        }
        try {
            if (writer != null) {

        this(null, null);
    }

    public ProtoLogger(@Nullable OutputStream out, @Nullable OutputStream err) {
        this.out = new PrintWriter(toPsOrDef(out, System.out), true);
        this.err = new PrintWriter(toPsOrDef(err, System.err), true);
    }

    private PrintStream toPsOrDef(OutputStream outputStream, PrintStream def) {
        if (outputStream == null) {
            return def;
        }

     */
    @Nonnull
    Optional<OutputStream> out();

    /**
     * Returns the error stream for the Maven execution, if running in embedded mode.
     *
     * @return an {@link Optional} containing the error stream, or empty if not applicable
     */
    @Nonnull
    Optional<OutputStream> err();

    /**

   * data written to it to the underlying {@link OutputStream}.
   *
   * <p>The {@link OutputStream} should not be written to before or after the hand-off.
   */
  // TODO(user): Evaluate whether it makes sense to always piggyback the computation of a
  // HashCode on an existing OutputStream, compared to creating a separate OutputStream that could
  // be (optionally) be combined with another if needed (with something like

            Map<String, String> userProperties,
            Map<String, String> systemProperties,
            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            O options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,

     * @throws IOException java.io.IOException if any.
     */
    public void write(OutputStream stream, Model model) throws IOException {
        try {
            delegate.write(stream, model.getDelegate());
        } catch (XMLStreamException e) {
            throw new IOException(e);
        }
    } // -- void write( OutputStream, Model )

 */
package org.apache.maven.model.io;

import javax.inject.Named;
import javax.inject.Singleton;
import javax.xml.stream.XMLStreamException;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.file.Files;
import java.util.Map;
import java.util.Objects;

import org.apache.maven.api.model.Model;