if (project == null) {
            project = Paths.get(System.getProperty("user.dir"));
        }
        if (Files.isDirectory(project)) {
            Path pom = project.resolve("pom.xml");
            return Files.isRegularFile(pom) ? pom : null;
        } else if (Files.isRegularFile(project)) {
            return project;
        } else {
            return null;
        }
    }

    /**
     * Builds the projects for the specified POM files and optionally their children.
     *
     * @param pomFiles The POM files to build, must not be {@code null}.
     * @param recursive {@code true} to recursively build submodules referenced by the POM files, {@code false} to
     *            build only the specified POM files.

 * under the License.
 */
package org.apache.maven.internal.transformation.impl;

import javax.inject.Inject;

import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;

import org.apache.maven.api.model.Model;
import org.apache.maven.artifact.repository.MavenArtifactRepository;

        Path pomPath = pomFile.resolveSibling(relativePath).normalize();
        if (Files.isDirectory(pomPath)) {
            pomPath = context.locate(pomPath);
        }

        if (pomPath == null || !Files.isRegularFile(pomPath)) {
            return Optional.empty();
        }

    }

    /**
     * Gets the artifact filter that controls downloading of artifact files. This filter operates on those artifacts
     * that have been included by the {@link #getCollectionFilter()}.
     *
     * @return The filter used to determine which of the artifacts should have their files resolved or {@code null} to
     *         resolve the files for all collected artifacts.
     */
    public ArtifactFilter getResolutionFilter() {

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.artifact.handler;

import javax.inject.Inject;

import java.io.File;
import java.nio.file.Files;
import java.util.List;

import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.testing.PlexusTest;

 */
package org.apache.maven.settings;

import javax.inject.Inject;
import javax.xml.stream.XMLStreamException;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;

import org.apache.maven.MavenTestHelper;
import org.apache.maven.api.settings.InputSource;
import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
import org.apache.maven.bridge.MavenRepositorySystem;

        String parentContent = new String(Files.readAllBytes(parent.toPath()), StandardCharsets.UTF_8);
        parentContent = parentContent.replace(
                "<packaging>pom</packaging>",
                "<packaging>pom</packaging><properties><addedProperty>addedValue</addedProperty></properties>");
        Files.write(parent.toPath(), parentContent.getBytes(StandardCharsets.UTF_8));

 *
 * @since 4.0.0
 */
@Experimental
public interface ToolchainsBuilder extends Service {

    /**
     * Builds the effective toolchains for the specified toolchains files.
     *
     * @param request the toolchains building request that holds the parameters, must not be {@code null}
     * @return the result of the toolchains building, never {@code null}

/**
 * Provides access to the contents of a source independently of the
 * backing store (e.g. file system, database, memory).
 * <p>
 * This is mainly used to parse files into objects such as
 * {@link org.apache.maven.api.Project},
 * {@link org.apache.maven.api.model.Model},
 * {@link org.apache.maven.api.settings.Settings}, or
 * {@link org.apache.maven.api.toolchain.PersistedToolchains}.
 *