Differential D4028 Diff 14692 java/src/main/java/org/softwareheritage/graph/SWHID.java

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java/src/main/java/org/softwareheritage/graph/SWHID.java

package org.softwareheritage.graph;		package org.softwareheritage.graph;

import com.fasterxml.jackson.annotation.JsonValue;		import com.fasterxml.jackson.annotation.JsonValue;
import org.apache.commons.codec.DecoderException;		import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;		import org.apache.commons.codec.binary.Hex;

/**		/**
* A Software Heritage persistent identifier (SWHID), see <a		* A Software Heritage persistent identifier (SWHID), see <a href=
* href="https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html#persistent-identifiers">persistent		* "https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html#persistent-identifiers">persistent
* identifier documentation</a>.		* identifier documentation</a>.
*		*
* @author The Software Heritage developers		* @author The Software Heritage developers
*/		*/

public class SWHID {		public class SWHID {
/** Fixed hash length of the SWHID */		/** Fixed hash length of the SWHID */
public static final int HASH_LENGTH = 40;		public static final int HASH_LENGTH = 40;
Show All 20 Lines	public SWHID(String swhid) {
if (!parts[3].matches("[0-9a-f]{" + HASH_LENGTH + "}")) {		if (!parts[3].matches("[0-9a-f]{" + HASH_LENGTH + "}")) {
throw new IllegalArgumentException("malformed SWHID: " + swhid);		throw new IllegalArgumentException("malformed SWHID: " + swhid);
}		}
}		}

/**		/**
* Creates a SWHID from a compact binary representation.		* Creates a SWHID from a compact binary representation.
* <p>		* <p>
* The binary format is specified in the Python module		* The binary format is specified in the Python module swh.graph.swhid:str_to_bytes .
* swh.graph.swhid:str_to_bytes .
*/		*/
public static SWHID fromBytes(byte[] input) {		public static SWHID fromBytes(byte[] input) {
byte[] digest = new byte[20];		byte[] digest = new byte[20];
System.arraycopy(input, 2, digest, 0, digest.length);		System.arraycopy(input, 2, digest, 0, digest.length);

String swhidStr = String.format(		String swhidStr = String.format("swh:%d:%s:%s", input[0], Node.Type.fromInt(input[1]).toString().toLowerCase(),
"swh:%d:%s:%s",		Hex.encodeHexString(digest));
input[0],
Node.Type.fromInt(input[1]).toString().toLowerCase(),
Hex.encodeHexString(digest)
);
return new SWHID(swhidStr);		return new SWHID(swhidStr);
}		}

@Override		@Override
public boolean equals(Object otherObj) {		public boolean equals(Object otherObj) {
if (otherObj == this)		if (otherObj == this)
return true;		return true;
if (!(otherObj instanceof SWHID))		if (!(otherObj instanceof SWHID))
Show All 11 Lines	public class SWHID {
@Override		@Override
public String toString() {		public String toString() {
return swhid;		return swhid;
}		}

/**		/**
* Converts SWHID to a compact binary representation.		* Converts SWHID to a compact binary representation.
* <p>		* <p>
* The binary format is specified in the Python module		* The binary format is specified in the Python module swh.graph.swhid:str_to_bytes .
* swh.graph.swhid:str_to_bytes .
*/		*/
public byte[] toBytes() {		public byte[] toBytes() {
byte[] bytes = new byte[22];		byte[] bytes = new byte[22];
byte[] digest;		byte[] digest;

bytes[0] = (byte) 1; // namespace version		bytes[0] = (byte) 1; // namespace version
bytes[1] = (byte) Node.Type.toInt(this.type); // SWHID type		bytes[1] = (byte) Node.Type.toInt(this.type); // SWHID type
try {		try {
digest = Hex.decodeHex(this.swhid.substring(10)); // SHA1 hash		digest = Hex.decodeHex(this.swhid.substring(10)); // SHA1 hash
System.arraycopy(digest, 0, bytes, 2, digest.length);		System.arraycopy(digest, 0, bytes, 2, digest.length);
} catch (DecoderException e) {		} catch (DecoderException e) {
throw new IllegalArgumentException("invalid hex sequence in SWHID: " + this.swhid);		throw new IllegalArgumentException("invalid hex sequence in SWHID: " + this.swhid);
}		}

return bytes;		return bytes;
}		}

Show All 20 Lines