* {@link RemoteRepository#getUrl()} root.
     *
     * @return the string if operation succeeded, {@code null} if source does not exist.
     * @throws RuntimeException If failed (and not due source not exists).
     */
    @Nonnull
    default Optional<String> getString(@Nonnull URI relativeSource) {
        return getString(relativeSource, StandardCharsets.UTF_8);
    }

    /**

    public String readLine() throws IOException {
        try {
            return prompter.prompt(null);
        } catch (org.apache.maven.api.services.PrompterException e) {
            throw new IOException("Unable to prompt", e);
        }
    }

    @Override
    public String readPassword() throws IOException {
        try {
            return prompter.promptForPassword(null);

/*
 * Copyright (C) 2009 The Guava Authors
 *
 * 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,

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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,

    }

    /**
     * {@return the group identifier of the artifact}.
     *
     * @see ArtifactCoordinates#getGroupId()
     */
    @Nonnull
    String getGroupId();

    /**
     * {@return the identifier of the artifact}.
     *
     * @see ArtifactCoordinates#getArtifactId()
     */
    @Nonnull
    String getArtifactId();

    /**
     * {@return the version of the artifact}.

                retVal = tokBuf.toString();
            }
        }

        return optional ? "?" + retVal : retVal;
    }

    public static String substVars(
            String value, String name, Map<String, String> props, UnaryOperator<String> callback) {
        return DefaultInterpolator.substVars(value, name, null, props, callback, null, false);
    }

     *
     * @param model The model to create a source hint for, may be {@code null}.
     * @return The user-friendly source hint, never {@code null}.
     */
    static String toSourceHint(Model model) {
        if (model == null) {
            return "";
        }

        StringBuilder buffer = new StringBuilder(128);

        buffer.append(toId(model));

     * @return the result of the settings building, never {@code null}
     * @throws SettingsBuilderException if the effective settings could not be built
     */
    @Nonnull
    SettingsBuilderResult build(@Nonnull SettingsBuilderRequest request);

    /**
     * Builds the effective settings of the specified settings sources.
     *
     * @return the result of the settings building, never {@code null}

public interface Source {
    /**
     * Provides access to the file backing this source, if available.
     * Not all sources are backed by files - for example, in-memory sources
     * or database-backed sources will return null.
     *
     * @return the underlying {@code Path} if this source is file-backed,
     *         or {@code null} if this source has no associated file
     */
    @Nullable
    Path getPath();

    /**

        }

        boolean effectiveVerbose() {
            return verbose;
        }
    }

    private static class MockOptions {
        private final boolean quiet;

        MockOptions(boolean quiet) {
            this.quiet = quiet;
        }

        Optional<Boolean> quiet() {
            return Optional.of(quiet);
        }
    }