/**
 * Factory methods for creating different types of sources.
 * <p>
 * This class provides specialized source implementations for different use cases:
 * <ul>
 *   <li>Path sources - simple access to file content</li>
 *   <li>Build sources - POM files being actively built by Maven</li>
 *   <li>Resolved sources - POMs resolved from repositories</li>
 * </ul>
 *
 * @since 4.0.0
 */
@Experimental

                <delete dir="${project.build.directory}/guava-gwt-sources" quiet="true" />
                <delete dir="${project.build.directory}/guava-test-gwt-sources" quiet="true" />

                <copy toDir="${project.build.directory}/guava-gwt-sources">
                  <fileset dir="${project.build.directory}/guava-sources">
                    <contains text="@GwtCompatible"/>
                  </fileset>

    }

    /**
     * Adds a source to the message.
     *
     * @param source the source to add
     */
    public void addSource(final ChatSource source) {
        if (sources == null) {
            sources = new ArrayList<>();
        }
        sources.add(source);
    }

    /**
     * Checks if this is a user message.
     *
     * @return true if this is a user message

   *
   * @param sources the sources to concatenate
   * @return a {@code ByteSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}
   * @since 15.0
   */
  public static ByteSource concat(ByteSource... sources) {
    return concat(ImmutableList.copyOf(sources));
  }

  /**

        if (!source.isEmpty()) {
          return false;
        }
      }
      return true;
    }

    @Override
    public Optional<Long> lengthIfKnown() {
      long result = 0L;
      for (CharSource source : sources) {
        Optional<Long> lengthIfKnown = source.lengthIfKnown();
        if (!lengthIfKnown.isPresent()) {
          return Optional.absent();
        }

        <executions>
          <execution>
            <id>add-benchmark-sources</id>
            <phase>generate-test-sources</phase>
            <goals><goal>add-test-source</goal></goals>
            <configuration>
              <sources>
                <source>benchmark</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>

 *   <li>Resolved sources: Used for artifacts that have been resolved by Maven from repositories
 *       (using groupId:artifactId:version coordinates) and downloaded to the local repository.
 *       These sources do not support resolving other sources.</li>
 * </ul>
 *
 * @since 4.0.0
 * @see Source
 */
public interface ModelSource extends Source {

    /**

        <executions>
          <execution>
            <id>add-benchmark-sources</id>
            <phase>generate-test-sources</phase>
            <goals><goal>add-test-source</goal></goals>
            <configuration>
              <sources>
                <source>benchmark</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>

            }

            // Send sources
            final List<ChatSource> sources = result.getMessage().getSources();
            if (sources != null && !sources.isEmpty()) {
                sendSseEvent(writer, "sources", Map.of("sources", sources));
                if (logger.isDebugEnabled()) {
                    logger.debug("SSE sources event sent. sourcesCount={}", sources.size());
                }
            }

            return List.of(
                    alias("generate-sources", SOURCES),
                    alias("process-sources", AFTER + SOURCES),
                    alias("generate-resources", RESOURCES),
                    alias("process-resources", AFTER + RESOURCES),
                    alias("process-classes", AFTER + COMPILE),
                    alias("generate-test-sources", TEST_SOURCES),