Differential D4006 Diff 19063 java/src/main/java/org/softwareheritage/graph/labels/DirEntry.java

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java/src/main/java/org/softwareheritage/graph/labels/DirEntry.java

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				package org.softwareheritage.graph.labels;

				/**
				* Directory entries metadata are stored as edge labels on the graph. {@link DirEntry} can be encoded in a single long
				* type, to re-use Webgraph interface.
				*
				* @author The Software Heritage developers
				*/
				public class DirEntry {
				public long filenameId;
				public int permission;

				public DirEntry(long filenameId, int permission)
				seirlAuthorUnsubmitted Done Inline Actions I would just have a constructor with `int permission`, but which takes the actual permission integer. No need to require the user to use that `Permission.Type`. seirl: I would just have a constructor with `int permission`, but which takes the actual permission…
				{
				this.filenameId = filenameId;
				this.permission = permission;
				}

				public DirEntry(long dirEntryEncoded)
				{
				this.filenameId = dirEntryEncoded >> Permission.NB_BITS_PER_TYPE;
				int dirBytes = (int) (dirEntryEncoded & ((1 << Permission.NB_BITS_PER_TYPE) - 1));
				this.permission = Permission.Type.fromEncoded(dirBytes);
				}

				public long toEncoded()
				{
				return (filenameId << Permission.NB_BITS_PER_TYPE) + Permission.Type.toEncoded(permission);
				}

				public static int labelWidth(long numLabels)
				{
				int filenameIdWidth = (int) Math.ceil(Math.log(numLabels) / Math.log(2));
				if (filenameIdWidth > Long.SIZE - Permission.NB_BITS_PER_TYPE) {
				System.err.println("FIXME: Too many filenames, we can't handle more than 2^" + (Long.SIZE - Permission.NB_BITS_PER_TYPE) + " for now.");
				System.exit(2);
				}
				return filenameIdWidth + Permission.NB_BITS_PER_TYPE;
				}

				/**
				* Permission types present in the Software Heritage graph.
				*
				* @author The Software Heritage developers
				*/
				private static class Permission {
				public static final int NB_BITS_PER_TYPE =
				(int) Math.ceil(Math.log(Permission.Type.values().length) / Math.log(2));

				public enum Type {
				CONTENT,
				EXECUTABLE_CONTENT,
				SYMLINK,
				DIRECTORY,
				REVISION;

				public static Permission.Type fromIntCode(int intCode) {
				switch (intCode) {
				case 0:
				return CONTENT;
				case 1:
				return EXECUTABLE_CONTENT;
				case 2:
				return SYMLINK;
				case 3:
				return DIRECTORY;
				case 4:
				return REVISION;
				}
				throw new IllegalArgumentException("Unknown node permission code: " + intCode);
				}

				public static int toIntCode(Permission.Type type) {
				switch (type) {
				case CONTENT:
				return 0;
				case EXECUTABLE_CONTENT:
				return 1;
				case SYMLINK:
				return 2;
				case DIRECTORY:
				return 3;
				case REVISION:
				return 4;
				}
				throw new IllegalArgumentException("Unknown node permission type: " + type);
				}

				public static Permission.Type fromIntPerm(int intPerm) {
				switch (intPerm) {
				case 0100644:
				return CONTENT;
				case 0100755:
				return EXECUTABLE_CONTENT;
				case 0120000:
				return SYMLINK;
				case 0040000:
				return DIRECTORY;
				case 0160000:
				return REVISION;
				}
				throw new IllegalArgumentException("Unknown node permission: " + intPerm);
				}

				public static int toIntPerm(Permission.Type type) {
				switch (type) {
				case CONTENT:
				return 0100644;
				case EXECUTABLE_CONTENT:
				return 0100755;
				case SYMLINK:
				return 0120000;
				case DIRECTORY:
				return 0040000;
				case REVISION:
				return 0160000;
				}
				throw new IllegalArgumentException("Unknown node permission type: " + type);
				}

				public static int fromEncoded(int encoded) {
				return toIntPerm(fromIntCode(encoded));
				}

				public static int toEncoded(int permission) {
				return toIntCode(fromIntPerm(permission));
				}
				}
				}

				}