locationPath = topDirectory.relativize(locationPath);
                    }
                    stringBuilder.append(" (").append(locationPath).append(")");
                }
            }
            stringBuilder.append(" @ line ").append(inputLocation.getLineNumber());
            return stringBuilder.toString();
        } else {
            return "unknown";
        }
    }

        StringBuilder sb = new StringBuilder(128);
        sb.append("MavenProject: ");
        sb.append(getGroupId());
        sb.append(':');
        sb.append(getArtifactId());
        sb.append(':');
        sb.append(getVersion());
        if (getFile() != null) {
            sb.append(" @ ");
            sb.append(getFile().getPath());
        }

        return sb.toString();
    }

            buffer.append("'parent.relativePath'");
            if (childModel != problems.getRootModel()) {
                buffer.append(" of POM ").append(ModelProblemUtils.toSourceHint(childModel));
            }
            buffer.append(" points at ").append(groupId).append(':').append(artifactId);
            buffer.append(" instead of ").append(parent.getGroupId()).append(':');

    public String toString() {
        StringBuilder buffer = new StringBuilder(64);
        buffer.append("{enabled=");
        buffer.append(enabled);
        buffer.append(", checksums=");
        buffer.append(checksumPolicy);
        buffer.append(", updates=");
        buffer.append(updatePolicy);
        buffer.append('}');
        return buffer.toString();
    }

        // So now we have an url of the form file://<path>

        // We want to eliminate any relative path nonsense and lock down the path so we
        // need to fully resolve it before any submodules use the path. This can happen
        // when you are using a custom settings.xml that contains a relative path entry
        // for the local repository setting.

        File localRepository = new File(url.substring("file://".length()));

        StringBuilder buf = new StringBuilder();

        buf.append(isLowerBoundInclusive() ? '[' : '(');
        if (getLowerBound() != null) {
            buf.append(getLowerBound().toString());
        }
        buf.append(',');
        if (getUpperBound() != null) {
            buf.append(getUpperBound().toString());
        }
        buf.append(isUpperBoundInclusive() ? ']' : ')');

        return buf.toString();

            // The root locator can be used very early during the setup of Maven,
            // even before the arguments from the command line are parsed.  Any exception
            // that would happen here should cause the build to fail at a later stage
            // (when actually parsing the POM) and will lead to a better exception being
            // displayed to the user, so just bail out and return false.
        }

     */
    <T> void set(@Nonnull Key<T> key, @Nullable T value);

    /**
     * Associates the specified session data with the given key if the key is currently mapped to the given value. This
     * method provides an atomic compare-and-update of some key's value.
     *
     * @param key the key under which to store the session data, must not be {@code null}

    }

    private static String createPath(List<String> elements) {
        StringBuilder buffer = new StringBuilder(256);
        for (String s : elements) {
            buffer.append(s).append(File.separator);
        }
        return buffer.toString().substring(0, buffer.toString().length() - 1);
    }

        StringBuilder path = new StringBuilder(128);

        path.append(formatAsDirectory(artifact.getGroupId())).append(PATH_SEPARATOR);
        path.append(artifact.getArtifactId()).append(PATH_SEPARATOR);
        path.append(artifact.getBaseVersion()).append(PATH_SEPARATOR);
        path.append(artifact.getArtifactId()).append(ARTIFACT_SEPARATOR).append(artifact.getVersion());

        if (artifact.hasClassifier()) {