}
                }
            }

            private Model findRawModel(Path from, Path p) {
                if (!Files.isRegularFile(p)) {
                    throw new IllegalArgumentException("Not a regular file: " + p);
                }

                if (!addEdge(from, p, problems)) {
                    return null;
                }

                || FAIL_AT_END.equals(failureBehavior)
                || FAIL_NEVER.equals(failureBehavior)) {
            this.failureBehavior = failureBehavior;
        } else {
            throw new IllegalArgumentException("Invalid failure behavior (must be one of: '" + FAIL_FAST + "', '"
                    + FAIL_AT_END + "', '" + FAIL_NEVER + "').");
        }
    }

    public String getFailureBehavior() {

 */
@Experimental
public interface ArtifactInstaller extends Service {
    /**
     * @param request {@link ArtifactInstallerRequest}
     * @throws ArtifactInstallerException in case of an error
     * @throws IllegalArgumentException in case {@code request} is {@code null}
     */
    void install(@Nonnull ArtifactInstallerRequest request);

    /**
     * @param session the repository session

            roots = prj.getCompileSourceRoots();
        } else if (scope == ProjectScope.TEST) {
            roots = prj.getTestCompileSourceRoots();
        } else {
            throw new IllegalArgumentException("Unsupported scope " + scope);
        }
        return roots.stream()
                .map(Paths::get)
                .collect(Collectors.collectingAndThen(toList(), Collections::unmodifiableList));
    }

            return DEFAULT_VALIDATION_LEVEL;
        }
        try {
            return ValidationReportLevel.valueOf(level.toUpperCase(Locale.ENGLISH));
        } catch (IllegalArgumentException e) {
            logger.warn(
                    "Invalid value specified for property {}: '{}'. Supported values are (case insensitive): {}",
                    MAVEN_PLUGIN_VALIDATION_KEY,

        this.runtimeInformation = runtimeInformation;
    }

    public MavenSession getMavenSession() {
        if (mavenSession == null) {
            throw new IllegalArgumentException("Found null mavenSession on session " + this);
        }
        return mavenSession;
    }

    @Override
    public List<Project> getProjects(List<MavenProject> projects) {

            artifacts = new SetWithResolutionResult(
                    ((ArtifactsSetWithResult) projectArtifacts).getResult(), projectArtifacts);
        } else {
            throw new IllegalArgumentException("projectArtifacts must implement ArtifactsSetWithResult");
        }

        CacheRecord record = new CacheRecord(artifacts);
        cache.put(key, record);
        return record;
    }

        assertFalse(rtInfo.isMavenVersion("[9.0,)"));

        assertThrows(
                IllegalArgumentException.class,
                () -> rtInfo.isMavenVersion("[3.0,"),
                "Bad version range wasn't rejected");

        assertThrows(
                IllegalArgumentException.class, () -> rtInfo.isMavenVersion(""), "Bad version range wasn't rejected");

        assertThrows(

     * @throws IllegalArgumentException when
     */
    public void setRequestType(final int requestType) {
        switch (requestType) {
            case REQUEST_PUT:
                break;
            case REQUEST_GET:
                break;
            default:
                throw new IllegalArgumentException("Illegal request type: " + requestType);
        }

        if (relativeSource.isAbsolute()) {
            throw new IllegalArgumentException("Supplied URI is not relative");
        }
        URI source = baseURI.resolve(relativeSource);
        if (!source.toASCIIString().startsWith(baseURI.toASCIIString())) {
            throw new IllegalArgumentException("Supplied relative URI escapes baseUrl");
        }
        GetTask getTask = new GetTask(source);