X-Git-Url: https://git.pterodactylus.net/?p=Sone.git;a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fdata%2FId.java;fp=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fdata%2FId.java;h=bc875b9bca6b2dd97d510dde7f105025dee6e9f5;hp=0000000000000000000000000000000000000000;hb=25eccb52bf670342982c1f87c85b191cf4ae56cd;hpb=d945b492b95c370539a0b6d64c37e4b93b5be190

diff --git a/src/main/java/net/pterodactylus/sone/data/Id.java b/src/main/java/net/pterodactylus/sone/data/Id.java
new file mode 100644
index 0000000..bc875b9
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/data/Id.java
@@ -0,0 +1,66 @@
+package net.pterodactylus.sone.data;
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Objects;
+import com.google.common.hash.HashFunction;
+import com.google.common.hash.Hashing;
+
+/**
+ * Container for a new, combined ID, originally computed from a {@link Sone}’s ID and an element’s ID.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Id {
+
+	private static final HashFunction HASH_FUNCTION = Hashing.sha256();
+	public static final int LENGTH = HASH_FUNCTION.bits() / 4;
+
+	private final HashFunction sha256 = HASH_FUNCTION;
+	private final String soneId;
+	private final String elementId;
+
+	private Id(String soneId, String elementId) {
+		this.soneId = soneId;
+		this.elementId = elementId;
+	}
+
+	public String getSoneId() {
+		return soneId;
+	}
+
+	public String getElementId() {
+		return elementId;
+	}
+
+	public String getExternal() {
+		return sha256.newHasher()
+				.putBytes(soneId.getBytes(Charsets.UTF_8))
+				.putBytes(elementId.getBytes(Charsets.UTF_8))
+				.hash().toString();
+	}
+
+	public static Id from(String soneId, String elementId) {
+		return new Id(soneId, elementId);
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		Id id = (Id) o;
+		return Objects.equal(soneId, id.soneId)
+				&& Objects.equal(elementId, id.elementId);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(soneId, elementId);
+	}
+
+	@Override
+	public String toString() {
+		return getExternal();
+	}
+
+}