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	diff --git a/java/src/main/java/org/softwareheritage/graph/Graph.java b/java/src/main/java/org/softwareheritage/graph/Graph.java
	index ad44a54..92b4cfa 100644
	--- a/java/src/main/java/org/softwareheritage/graph/Graph.java
	+++ b/java/src/main/java/org/softwareheritage/graph/Graph.java
	@@ -1,257 +1,310 @@
	package org.softwareheritage.graph;

	import it.unimi.dsi.big.webgraph.ImmutableGraph;
	import it.unimi.dsi.big.webgraph.LazyLongIterator;
	import it.unimi.dsi.big.webgraph.Transform;
	+import it.unimi.dsi.logging.ProgressLogger;
	import org.softwareheritage.graph.maps.NodeIdMap;
	import org.softwareheritage.graph.maps.NodeTypesMap;

	import java.io.IOException;

	/**
	* Main class storing the compressed graph and node id mappings.
	* <p>
	* The compressed graph is stored using the <a href="http://webgraph.di.unimi.it/">WebGraph</a>
	* ecosystem. Additional mappings are necessary because Software Heritage uses string based <a href=
	* "https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html">persistent
	* identifiers</a> (SWHID) while WebGraph uses integers internally. These two mappings (long id
	* ↔ SWHID) are used for the input (users refer to the graph using SWHID) and the output
	* (convert back to SWHID for users results). However, since graph traversal can be restricted
	* depending on the node type (see {@link AllowedEdges}), a long id → node type map is stored
	* as well to avoid a full SWHID lookup.
	*
	* @author The Software Heritage developers
	* @see org.softwareheritage.graph.AllowedEdges
	* @see org.softwareheritage.graph.maps.NodeIdMap
	* @see org.softwareheritage.graph.maps.NodeTypesMap
	*/

	public class Graph extends ImmutableGraph {
	/** File extension for the SWHID to long node id map */
	public static final String SWHID_TO_NODE = ".swhid2node.bin";
	/** File extension for the long node id to SWHID map */
	public static final String NODE_TO_SWHID = ".node2swhid.bin";
	/** File extension for the long node id to node type map */
	public static final String NODE_TO_TYPE = ".node2type.map";

	/** Compressed graph stored as a {@link it.unimi.dsi.big.webgraph.BVGraph} */
	ImmutableGraph graph;
	/** Transposed compressed graph (used for backward traversals) */
	ImmutableGraph graphTransposed;
	/** Path and basename of the compressed graph */
	String path;
	/** Mapping long id ↔ SWHIDs */
	NodeIdMap nodeIdMap;
	/** Mapping long id → node types */
	NodeTypesMap nodeTypesMap;

	/**
	* Constructor.
	*
	* @param path path and basename of the compressed graph to load
	*/
	+
	public Graph(String path) throws IOException {
	+ loadInternal(path, null, LoadMethod.MAPPED);
	+ }
	+
	+ /**
	+ * Loading mechanisms
	+ */
	+
	+ enum LoadMethod {
	+ MEMORY, MAPPED, OFFLINE,
	+ }
	+
	+ protected Graph loadInternal(String path, ProgressLogger pl, LoadMethod method) throws IOException {
	this.path = path;
	- this.graph = ImmutableGraph.loadMapped(path);
	- this.graphTransposed = ImmutableGraph.loadMapped(path + "-transposed");
	+ if (method == LoadMethod.MEMORY) {
	+ this.graph = ImmutableGraph.load(path, pl);
	+ this.graphTransposed = ImmutableGraph.load(path + "-transposed", pl);
	+ } else if (method == LoadMethod.MAPPED) {
	+ this.graph = ImmutableGraph.loadMapped(path, pl);
	+ this.graphTransposed = ImmutableGraph.loadMapped(path + "-transposed", pl);
	+ } else if (method == LoadMethod.OFFLINE) {
	+ this.graph = ImmutableGraph.loadOffline(path, pl);
	+ this.graphTransposed = ImmutableGraph.loadOffline(path + "-transposed", pl);
	+ }
	this.nodeTypesMap = new NodeTypesMap(path);
	this.nodeIdMap = new NodeIdMap(path, numNodes());
	+ return this;
	+ }
	+
	+ protected Graph() {
	+ }
	+
	+ public Graph load(String Path, ProgressLogger pl) throws IOException {
	+ return new Graph().loadInternal(path, pl, LoadMethod.MEMORY);
	}

	+ public Graph loadMapped(String Path, ProgressLogger pl) throws IOException {
	+ return new Graph().loadInternal(path, pl, LoadMethod.MAPPED);
	+ }
	+
	+ public Graph loadOffline(String Path, ProgressLogger pl) throws IOException {
	+ return new Graph().loadInternal(path, null, LoadMethod.OFFLINE);
	+ }
	+
	+ public Graph load(String Path) throws IOException {
	+ return new Graph().loadInternal(path, null, LoadMethod.MEMORY);
	+ }
	+
	+ public Graph loadMapped(String Path) throws IOException {
	+ return new Graph().loadInternal(path, null, LoadMethod.MAPPED);
	+ }
	+
	+ public Graph loadOffline(String Path) throws IOException {
	+ return new Graph().loadInternal(path, null, LoadMethod.OFFLINE);
	+ }
	+
	+ /**
	+ * Constructor used for copy()
	+ */
	protected Graph(ImmutableGraph graph, ImmutableGraph graphTransposed, String path, NodeIdMap nodeIdMap,
	NodeTypesMap nodeTypesMap) {
	this.graph = graph;
	this.graphTransposed = graphTransposed;
	this.path = path;
	this.nodeIdMap = nodeIdMap;
	this.nodeTypesMap = nodeTypesMap;
	}

	/**
	* Return a flyweight copy of the graph.
	*/
	@Override
	public Graph copy() {
	return new Graph(this.graph.copy(), this.graphTransposed.copy(), this.path, this.nodeIdMap, this.nodeTypesMap);
	}

	@Override
	public boolean randomAccess() {
	return graph.randomAccess() && graphTransposed.randomAccess();
	}

	/**
	* Return a transposed version of the graph.
	*/
	public Graph transpose() {
	return new Graph(this.graphTransposed, this.graph, this.path, this.nodeIdMap, this.nodeTypesMap);
	}

	/**
	* Return a symmetric version of the graph.
	*/
	public Graph symmetrize() {
	ImmutableGraph symmetric = Transform.union(graph, graphTransposed);
	return new Graph(symmetric, symmetric, this.path, this.nodeIdMap, this.nodeTypesMap);
	}

	/**
	* Cleans up graph resources after use.
	*/
	public void cleanUp() throws IOException {
	nodeIdMap.close();
	}

	/**
	* Returns number of nodes in the graph.
	*
	* @return number of nodes in the graph
	*/
	@Override
	public long numNodes() {
	return graph.numNodes();
	}

	/**
	* Returns number of edges in the graph.
	*
	* @return number of edges in the graph
	*/
	@Override
	public long numArcs() {
	return graph.numArcs();
	}

	/**
	* Returns lazy iterator of successors of a node.
	*
	* @param nodeId node specified as a long id
	* @return lazy iterator of successors of the node, specified as a
	* <a href="http://webgraph.di.unimi.it/">WebGraph</a> LazyLongIterator
	*/
	@Override
	public LazyLongIterator successors(long nodeId) {
	return graph.successors(nodeId);
	}

	/**
	* Returns lazy iterator of successors of a node while following a specific set of edge types.
	*
	* @param nodeId node specified as a long id
	* @param allowedEdges the specification of which edges can be traversed
	* @return lazy iterator of successors of the node, specified as a
	* <a href="http://webgraph.di.unimi.it/">WebGraph</a> LazyLongIterator
	*/
	public LazyLongIterator successors(long nodeId, AllowedEdges allowedEdges) {
	if (allowedEdges.restrictedTo == null) {
	// All edges are allowed, bypass edge check
	return this.successors(nodeId);
	} else {
	LazyLongIterator allSuccessors = this.successors(nodeId);
	Graph thisGraph = this;
	return new LazyLongIterator() {
	@Override
	public long nextLong() {
	long neighbor;
	while ((neighbor = allSuccessors.nextLong()) != -1) {
	if (allowedEdges.isAllowed(thisGraph.getNodeType(nodeId), thisGraph.getNodeType(neighbor))) {
	return neighbor;
	}
	}
	return -1;
	}

	@Override
	public long skip(final long n) {
	long i;
	for (i = 0; i < n && nextLong() != -1; i++)
	;
	return i;
	}
	};
	}
	}

	/**
	* Returns the outdegree of a node.
	*
	* @param nodeId node specified as a long id
	* @return outdegree of a node
	*/
	@Override
	public long outdegree(long nodeId) {
	return graph.outdegree(nodeId);
	}

	/**
	* Returns lazy iterator of predecessors of a node.
	*
	* @param nodeId node specified as a long id
	* @return lazy iterator of predecessors of the node, specified as a
	* <a href="http://webgraph.di.unimi.it/">WebGraph</a> LazyLongIterator
	*/
	public LazyLongIterator predecessors(long nodeId) {
	return this.transpose().successors(nodeId);
	}

	/**
	* Returns the indegree of a node.
	*
	* @param nodeId node specified as a long id
	* @return indegree of a node
	*/
	public long indegree(long nodeId) {
	return this.transpose().outdegree(nodeId);
	}

	/**
	* Returns the underlying BVGraph.
	*
	* @return WebGraph BVGraph
	*/
	public ImmutableGraph getGraph() {
	return this.graph;
	}

	/**
	* Returns the graph full path.
	*
	* @return graph full path
	*/
	public String getPath() {
	return path;
	}

	/**
	* Converts {@link SWHID} node to long.
	*
	* @param swhid node specified as a {@link SWHID}
	* @return internal long node id
	* @see SWHID
	*/
	public long getNodeId(SWHID swhid) {
	return nodeIdMap.getNodeId(swhid);
	}

	/**
	* Converts long id node to {@link SWHID}.
	*
	* @param nodeId node specified as a long id
	* @return external SWHID
	* @see SWHID
	*/
	public SWHID getSWHID(long nodeId) {
	return nodeIdMap.getSWHID(nodeId);
	}

	/**
	* Returns node type.
	*
	* @param nodeId node specified as a long id
	* @return corresponding node type
	* @see org.softwareheritage.graph.Node.Type
	*/
	public Node.Type getNodeType(long nodeId) {
	return nodeTypesMap.getType(nodeId);
	}
	}
	diff --git a/java/src/main/java/org/softwareheritage/graph/experiments/topology/InOutDegree.java b/java/src/main/java/org/softwareheritage/graph/experiments/topology/InOutDegree.java
	index c7370d2..e3f67a2 100644
	--- a/java/src/main/java/org/softwareheritage/graph/experiments/topology/InOutDegree.java
	+++ b/java/src/main/java/org/softwareheritage/graph/experiments/topology/InOutDegree.java
	@@ -1,239 +1,239 @@
	package org.softwareheritage.graph.experiments.topology;

	import java.io.File;
	import java.io.FileWriter;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.lang.reflect.InvocationTargetException;
	import java.util.*;

	import com.martiansoftware.jsap.JSAP;
	import com.martiansoftware.jsap.JSAPException;
	import com.martiansoftware.jsap.JSAPResult;
	import com.martiansoftware.jsap.Parameter;
	import com.martiansoftware.jsap.SimpleJSAP;
	import com.martiansoftware.jsap.UnflaggedOption;

	import it.unimi.dsi.logging.ProgressLogger;
	import org.softwareheritage.graph.Graph;
	import org.softwareheritage.graph.Node;

	public class InOutDegree {
	private InOutDegree() {
	}

	private static final int NODE_ARRAY_SIZE = Node.Type.values().length + 1;
	private static final int TYPE_ALL = Node.Type.values().length;
	private static final int TYPE_CNT = Node.Type.toInt(Node.Type.CNT);
	private static final int TYPE_DIR = Node.Type.toInt(Node.Type.DIR);
	private static final int TYPE_REV = Node.Type.toInt(Node.Type.REV);
	private static final int TYPE_REL = Node.Type.toInt(Node.Type.REL);
	private static final int TYPE_SNP = Node.Type.toInt(Node.Type.SNP);
	private static final int TYPE_ORI = Node.Type.toInt(Node.Type.ORI);

	public static long[] outdegreeTypes(final Graph graph, long node) {
	long[] out = new long[NODE_ARRAY_SIZE];
	var successors = graph.successors(node);
	long neighbor;
	while ((neighbor = successors.nextLong()) != -1) {
	out[Node.Type.toInt(graph.getNodeType(neighbor))]++;
	out[TYPE_ALL]++;
	}
	return out;
	}

	public static long[] indegreeTypes(final Graph graph, long node) {
	return outdegreeTypes(graph.transpose(), node);
	}

	public static void writeDistribution(HashMap<Long, Long> distribution, String filename) throws IOException {
	PrintWriter f = new PrintWriter(new FileWriter(filename));
	TreeMap<Long, Long> sortedDistribution = new TreeMap<>(distribution);
	for (Map.Entry<Long, Long> entry : sortedDistribution.entrySet()) {
	f.println(entry.getKey() + " " + entry.getValue());
	}
	f.close();
	}

	public static void run(final Graph graph, String resultsDir) throws IOException {
	// Per-type
	var cnt_in_dir = new HashMap<Long, Long>();
	var dir_in_dir = new HashMap<Long, Long>();
	var dir_in_rev = new HashMap<Long, Long>();
	var dir_in_all = new HashMap<Long, Long>();
	var dir_out_all = new HashMap<Long, Long>();
	var dir_out_dir = new HashMap<Long, Long>();
	var dir_out_cnt = new HashMap<Long, Long>();
	var dir_out_rev = new HashMap<Long, Long>();
	var rev_in_dir = new HashMap<Long, Long>();
	var rev_in_rel = new HashMap<Long, Long>();
	var rev_in_rev = new HashMap<Long, Long>();
	var rev_in_snp = new HashMap<Long, Long>();
	var rev_in_all = new HashMap<Long, Long>();
	var rev_out_rev = new HashMap<Long, Long>();
	var rel_in_snp = new HashMap<Long, Long>();
	var snp_in_ori = new HashMap<Long, Long>();
	var snp_out_all = new HashMap<Long, Long>();
	var snp_out_rel = new HashMap<Long, Long>();
	var snp_out_rev = new HashMap<Long, Long>();
	var ori_out_snp = new HashMap<Long, Long>();

	// Aggregated per layer
	var full_in = new HashMap<Long, Long>();
	var full_out = new HashMap<Long, Long>();
	var dircnt_in = new HashMap<Long, Long>();
	var dircnt_out = new HashMap<Long, Long>();
	var orisnp_in = new HashMap<Long, Long>();
	var orisnp_out = new HashMap<Long, Long>();
	var relrev_in = new HashMap<Long, Long>();
	var relrev_out = new HashMap<Long, Long>();
	var rev_in = rev_in_rev; // alias for single-type layer
	var rev_out = rev_out_rev;

	final ProgressLogger pl = new ProgressLogger();
	pl.itemsName = "nodes";
	pl.expectedUpdates = graph.numNodes();
	pl.start("Scanning...");

	long[] in;
	long[] out;

	for (long i = graph.numNodes(); i-- != 0;) {
	long d_in = graph.indegree(i);
	long d_out = graph.outdegree(i);

	full_in.merge(d_in, 1L, Long::sum);
	full_out.merge(d_out, 1L, Long::sum);

	switch (graph.getNodeType(i)) {
	case CNT:
	cnt_in_dir.merge(d_in, 1L, Long::sum);

	dircnt_in.merge(d_in, 1L, Long::sum);
	dircnt_out.merge(0L, 1L, Long::sum);
	break;
	case DIR:
	in = indegreeTypes(graph, i);
	out = outdegreeTypes(graph, i);

	dir_in_all.merge(in[TYPE_ALL], 1L, Long::sum);
	dir_out_all.merge(out[TYPE_ALL], 1L, Long::sum);
	dir_in_dir.merge(in[TYPE_DIR], 1L, Long::sum);
	dir_in_rev.merge(in[TYPE_REV], 1L, Long::sum);
	dir_out_cnt.merge(out[TYPE_CNT], 1L, Long::sum);
	dir_out_dir.merge(out[TYPE_DIR], 1L, Long::sum);
	dir_out_rev.merge(out[TYPE_REV], 1L, Long::sum);

	dircnt_in.merge(in[TYPE_DIR] + in[TYPE_CNT], 1L, Long::sum);
	dircnt_out.merge(out[TYPE_DIR] + out[TYPE_CNT], 1L, Long::sum);
	break;
	case REV:
	in = indegreeTypes(graph, i);
	out = outdegreeTypes(graph, i);

	rev_in_all.merge(in[TYPE_ALL], 1L, Long::sum);
	rev_in_dir.merge(in[TYPE_DIR], 1L, Long::sum);
	rev_in_rev.merge(in[TYPE_REV], 1L, Long::sum);
	rev_in_rel.merge(in[TYPE_REL], 1L, Long::sum);
	rev_in_snp.merge(in[TYPE_SNP], 1L, Long::sum);
	rev_out_rev.merge(out[TYPE_REV], 1L, Long::sum);

	relrev_in.merge(in[TYPE_REL] + in[TYPE_REV], 1L, Long::sum);
	relrev_out.merge(out[TYPE_REL] + out[TYPE_REV], 1L, Long::sum);
	break;
	case REL:
	rel_in_snp.merge(d_in, 1L, Long::sum);

	relrev_in.merge(0L, 1L, Long::sum);
	relrev_out.merge(d_out, 1L, Long::sum);
	break;
	case SNP:
	out = outdegreeTypes(graph, i);

	snp_in_ori.merge(d_in, 1L, Long::sum);
	snp_out_all.merge(out[TYPE_ALL], 1L, Long::sum);
	snp_out_rel.merge(out[TYPE_REL], 1L, Long::sum);
	snp_out_rev.merge(out[TYPE_REV], 1L, Long::sum);

	orisnp_in.merge(d_in, 1L, Long::sum);
	orisnp_out.merge(out[TYPE_REL] + out[TYPE_REV], 1L, Long::sum);
	break;
	case ORI:
	ori_out_snp.merge(d_out, 1L, Long::sum);

	orisnp_in.merge(0L, 1L, Long::sum);
	orisnp_out.merge(d_out, 1L, Long::sum);
	break;
	- default:
	+ default :
	pl.logger().warn("Invalid node type at pos {}", i);
	break;
	}

	pl.update();
	}

	pl.done();

	(new File(resultsDir)).mkdir();
	writeDistribution(full_in, resultsDir + "/full_in.txt");
	writeDistribution(full_out, resultsDir + "/full_out.txt");
	writeDistribution(dircnt_in, resultsDir + "/dir+cnt_in.txt");
	writeDistribution(dircnt_out, resultsDir + "/dir+cnt_out.txt");
	writeDistribution(relrev_in, resultsDir + "/rel+rev_in.txt");
	writeDistribution(relrev_out, resultsDir + "/rel+rev_out.txt");
	writeDistribution(orisnp_in, resultsDir + "/ori+snp_in.txt");
	writeDistribution(orisnp_out, resultsDir + "/ori+snp_out.txt");
	writeDistribution(rev_in, resultsDir + "/rev_in.txt");
	writeDistribution(rev_out, resultsDir + "/rev_out.txt");

	String resultsTypeDir = resultsDir + "/per_type";
	(new File(resultsTypeDir)).mkdir();
	writeDistribution(cnt_in_dir, resultsTypeDir + "/cnt_in_dir.txt");
	writeDistribution(dir_in_dir, resultsTypeDir + "/dir_in_dir.txt");
	writeDistribution(dir_in_rev, resultsTypeDir + "/dir_in_rev.txt");
	writeDistribution(dir_in_all, resultsTypeDir + "/dir_in_all.txt");
	writeDistribution(dir_out_all, resultsTypeDir + "/dir_out_all.txt");
	writeDistribution(dir_out_dir, resultsTypeDir + "/dir_out_dir.txt");
	writeDistribution(dir_out_cnt, resultsTypeDir + "/dir_out_cnt.txt");
	writeDistribution(dir_out_rev, resultsTypeDir + "/dir_out_rev.txt");
	writeDistribution(rev_in_dir, resultsTypeDir + "/rev_in_dir.txt");
	writeDistribution(rev_in_rel, resultsTypeDir + "/rev_in_rel.txt");
	writeDistribution(rev_in_rev, resultsTypeDir + "/rev_in_rev.txt");
	writeDistribution(rev_in_snp, resultsTypeDir + "/rev_in_snp.txt");
	writeDistribution(rev_in_all, resultsTypeDir + "/rev_in_all.txt");
	writeDistribution(rev_out_rev, resultsTypeDir + "/rev_out_rev.txt");
	writeDistribution(rel_in_snp, resultsTypeDir + "/rel_in_snp.txt");
	writeDistribution(snp_in_ori, resultsTypeDir + "/snp_in_ori.txt");
	writeDistribution(snp_out_all, resultsTypeDir + "/snp_out_all.txt");
	writeDistribution(snp_out_rel, resultsTypeDir + "/snp_out_rel.txt");
	writeDistribution(snp_out_rev, resultsTypeDir + "/snp_out_rev.txt");
	writeDistribution(ori_out_snp, resultsTypeDir + "/ori_out_snp.txt");

	}

	static public void main(final String[] arg)
	throws IllegalArgumentException, SecurityException, IllegalAccessException, InvocationTargetException,
	NoSuchMethodException, JSAPException, IOException, ClassNotFoundException {
	final SimpleJSAP jsap = new SimpleJSAP(InOutDegree.class.getName(),
	"Computes in and out degrees of the given SWHGraph",
	new Parameter[]{
	new UnflaggedOption("basename", JSAP.STRING_PARSER, JSAP.NO_DEFAULT, JSAP.REQUIRED,
	JSAP.NOT_GREEDY, "The basename of the graph."),
	new UnflaggedOption("resultsDir", JSAP.STRING_PARSER, JSAP.NO_DEFAULT, JSAP.NOT_REQUIRED,
	JSAP.NOT_GREEDY, "The directory of the resulting files."),});

	final JSAPResult jsapResult = jsap.parse(arg);
	if (jsap.messagePrinted())
	System.exit(1);

	final String basename = jsapResult.getString("basename");
	final String resultsDir = jsapResult.userSpecified("resultsDir")
	? jsapResult.getString("resultsDir")
	: basename;

	final ProgressLogger pl = new ProgressLogger();

	Graph graph = new Graph(basename);
	run(graph, resultsDir);
	}
	}

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