// snapshot timestamp, or some other timestamp later encoded into the metadata.
        // TODO this needs to be repeated here so the merging doesn't interfere with the written metadata
        //  - we'd be much better having a pristine input, and an ongoing metadata for merging instead

        Map<ArtifactRepository, Metadata> previousMetadata = new HashMap<>();
        ArtifactRepository selected = null;

    /**
     * Simply converts the given content to an xml string.
     *
     * @param content the object to convert
     * @return the xml string representation
     * @throws XmlWriterException if an error occurs during the transformation
     * @see #fromXmlString(String)
     */
    @Nonnull
    default String toXmlString(@Nonnull T content) throws XmlWriterException {
        StringWriter sw = new StringWriter();

                            target.getLocation("properties"), source.getLocation("properties"), sourceDominant));
        }

        private void putAll(Map<String, String> s, Map<String, String> t, Object excludeKey) {
            for (Map.Entry<String, String> e : t.entrySet()) {
                if (!e.getKey().equals(excludeKey)) {
                    s.put(e.getKey(), e.getValue());
                }
            }
        }

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Signals a collision of two or more projects with the same g:a:v during a reactor build.
 *
 */
public class DuplicateProjectException extends MavenExecutionException {

    private Map<String, List<File>> collisions;

    /**
     * Creates a new exception with specified details.
     *

 * under the License.
 */
package org.apache.maven.reporting;

/**
 * An exception occurring during the execution of a Maven report.
 *
 */
@Deprecated
public class MavenReportException extends Exception {
    public MavenReportException(String msg) {
        super(msg);
    }

    public MavenReportException(String msg, Exception e) {
        super(msg, e);
    }

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

/**
 * Describes a problem that was encountered during model building. A problem can either be an exception that was thrown
 * or a simple string message. In addition, a problem carries a hint about its source, e.g. the POM file that exhibits
 * the problem.
 *
 */
public interface ModelProblem extends BuilderProblem {

    }

    public boolean storedInArtifactVersionDirectory() {
        return false;
    }

    public String getGroupId() {
        return artifact.getGroupId();
    }

    public String getArtifactId() {
        return artifact.getArtifactId();
    }

    public String getBaseVersion() {
        // Don't want the artifact's version in here, as this is stored in the directory above that
        return null;

    /**
     * Returns an immutable map of the project properties.
     *
     * @see #setProperty(Project, String, String)
     */
    @Nonnull
    Map<String, String> getProperties(@Nonnull Project project);

    /**
     * Set a given project property.
     *
     * @param project the project to modify
     * @param key they property's key

                && Objects.equals(a1.getArtifactId(), a2.getArtifactId())
                && Objects.equals(a1.getVersion(), a2.getVersion());
    }

    private Map<String, String> toProperties(Map<String, String> dominant, Map<String, String> recessive) {
        Map<String, String> props = new HashMap<>();
        if (recessive != null) {
            props.putAll(recessive);
        }
        if (dominant != null) {

/**
 * An exception thrown during the writing of an xml file.
 *
 * @since 4.0.0
 */
@Experimental
public class XmlWriterException extends MavenException {

    private final Location location;

    /**
     * @param message the message for the exception
     * @param e the exception itself
     */
    public XmlWriterException(String message, Location location, Exception e) {