log4j-slf4j-impl/src/main/java/org/apache/logging/slf4j/Log4jMarker.java [31:124]:
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public class Log4jMarker implements Marker {

    public static final long serialVersionUID = 1590472L;

    private final IMarkerFactory factory;

    private final org.apache.logging.log4j.Marker marker;

    /**
     * Constructs a Log4jMarker using an existing Log4j {@link org.apache.logging.log4j.Marker}.
     * @param marker The Log4j Marker upon which to base this Marker.
     */
    public Log4jMarker(final IMarkerFactory markerFactory, final org.apache.logging.log4j.Marker marker) {
        this.factory = markerFactory;
        this.marker = marker;
    }

    @Override
    public void add(final Marker marker) {
        if (marker == null) {
            throw new IllegalArgumentException();
        }
        final Marker m = factory.getMarker(marker.getName());
        this.marker.addParents(((Log4jMarker) m).getLog4jMarker());
    }

    @Override
    public boolean contains(final Marker marker) {
        if (marker == null) {
            throw new IllegalArgumentException();
        }
        return this.marker.isInstanceOf(marker.getName());
    }

    @Override
    public boolean contains(final String s) {
        return s != null ? this.marker.isInstanceOf(s) : false;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof Log4jMarker)) {
            return false;
        }
        final Log4jMarker other = (Log4jMarker) obj;
        return Objects.equals(marker, other.marker);
    }

    public org.apache.logging.log4j.Marker getLog4jMarker() {
        return marker;
    }

    @Override
    public String getName() {
        return marker.getName();
    }

    @Override
    public boolean hasChildren() {
        return marker.hasParents();
    }

    @Override
    public int hashCode() {
        return 31 + Objects.hashCode(marker);
    }

    @Override
    public boolean hasReferences() {
        return marker.hasParents();
    }

    @Override
    public Iterator<Marker> iterator() {
        final org.apache.logging.log4j.Marker[] log4jParents = this.marker.getParents();
        if (log4jParents == null) {
            return Collections.emptyIterator();
        }
        final List<Marker> parents = new ArrayList<>(log4jParents.length);
        for (final org.apache.logging.log4j.Marker m : log4jParents) {
            parents.add(factory.getMarker(m.getName()));
        }
        return parents.iterator();
    }

    @Override
    public boolean remove(final Marker marker) {
        return marker != null ? this.marker.remove(MarkerManager.getMarker(marker.getName())) : false;
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log4j-slf4j2-impl/src/main/java/org/apache/logging/slf4j/Log4jMarker.java [31:124]:
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public class Log4jMarker implements Marker {

    public static final long serialVersionUID = 1590472L;

    private final IMarkerFactory factory;

    private final org.apache.logging.log4j.Marker marker;

    /**
     * Constructs a Log4jMarker using an existing Log4j {@link org.apache.logging.log4j.Marker}.
     * @param marker The Log4j Marker upon which to base this Marker.
     */
    public Log4jMarker(final IMarkerFactory markerFactory, final org.apache.logging.log4j.Marker marker) {
        this.factory = markerFactory;
        this.marker = marker;
    }

    @Override
    public void add(final Marker marker) {
        if (marker == null) {
            throw new IllegalArgumentException();
        }
        final Marker m = factory.getMarker(marker.getName());
        this.marker.addParents(((Log4jMarker) m).getLog4jMarker());
    }

    @Override
    public boolean contains(final Marker marker) {
        if (marker == null) {
            throw new IllegalArgumentException();
        }
        return this.marker.isInstanceOf(marker.getName());
    }

    @Override
    public boolean contains(final String s) {
        return s != null ? this.marker.isInstanceOf(s) : false;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof Log4jMarker)) {
            return false;
        }
        final Log4jMarker other = (Log4jMarker) obj;
        return Objects.equals(marker, other.marker);
    }

    public org.apache.logging.log4j.Marker getLog4jMarker() {
        return marker;
    }

    @Override
    public String getName() {
        return marker.getName();
    }

    @Override
    public boolean hasChildren() {
        return marker.hasParents();
    }

    @Override
    public int hashCode() {
        return 31 + Objects.hashCode(marker);
    }

    @Override
    public boolean hasReferences() {
        return marker.hasParents();
    }

    @Override
    public Iterator<Marker> iterator() {
        final org.apache.logging.log4j.Marker[] log4jParents = this.marker.getParents();
        if (log4jParents == null) {
            return Collections.emptyIterator();
        }
        final List<Marker> parents = new ArrayList<>(log4jParents.length);
        for (final org.apache.logging.log4j.Marker m : log4jParents) {
            parents.add(factory.getMarker(m.getName()));
        }
        return parents.iterator();
    }

    @Override
    public boolean remove(final Marker marker) {
        return marker != null ? this.marker.remove(MarkerManager.getMarker(marker.getName())) : false;
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