* value is undefined.
     *
     * @return The location of the problem, never {@code null}.
     */
    String getLocation();

    /**
     * Gets the exception that caused this problem (if any).
     *
     * @return The exception that caused this problem or {@code null} if not applicable.
     */
    Exception getException();

     *   <li>Description: {@code <memory>} or {@code <database>}</li>
     * </ul>
     *
     * @return a non-null string describing the source location
     */
    @Nonnull
    String getLocation();

    /**
     * Resolves a new source relative to this one.
     * <p>
     * The resolution strategy depends on the source type:
     * <ul>
     *   <li>File sources resolve against their parent directory</li>

        @Nonnull
        public InputStream openStream() throws IOException {
            return Files.newInputStream(path);
        }

        @Override
        @Nonnull
        public String getLocation() {
            return location;
        }

        @Override
        @Nullable
        public Source resolve(@Nonnull String relative) {
            return new PathSource(path.resolve(relative));

     * value is undefined.
     *
     * @return the location of the problem, never {@code null}
     */
    @Nonnull
    String getLocation();

    /**
     * Gets the exception that caused this problem (if any).
     *
     * @return the exception that caused this problem or {@code null} if not applicable
     */
    @Nullable

                @Override
                public Path getPath() {
                    return Paths.get("test-pom.xml");
                }

                @Override
                public String getLocation() {
                    return "test-pom.xml";
                }

                @Override
                public InputStream openStream() throws IOException {
                    return null;

                    .map(MojoExecution::getPlugin)
                    .filter(p -> p.getLocation("version") != null
                            && p.getLocation("version").getSource() != null
                            && defaulModelId.equals(
                                    p.getLocation("version").getSource().getModelId()))
                    .distinct()

            @Override
            public InputStream openStream() throws IOException {
                return Files.newInputStream(actual);
            }

            @Override
            public String getLocation() {
                return actual.toString();
            }

            @Override
            public Source resolve(String relative) {
                return Sources.buildSource(actual.resolve(relative));

                slf4jLogger.warn("{} @ {}", problem.getMessage(), problem.getLocation());
            }

            slf4jLogger.warn("");
        }
    }

    private Object getLocation(Source source, File defaultLocation) {
        if (source != null) {
            return source.getLocation();
        }
        return defaultLocation;
    }

            }
            trackingData.add(indent + plugin.getGroupId() + ":" + plugin.getArtifactId() + ":" + plugin.getVersion());
            indent.append("  ");

            InputLocation location = plugin.getLocation("");
            if (location != null && location.getSource() != null) {
                trackingData.add(indent + location.getSource().getModelId() + " (implicit)");
                indent.append("  ");
            }

        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>1.2.0+</version>
          <code>
    @Override
    public String toString() {
        return getLocation();
    }
          </code>
        </codeSegment>
      </codeSegments>
    </class>
  </classes>