Extract lib module

[signal-cli] / lib / src / main / java / org / asamk / signal / manager / groups / GroupId.java

diff --git a/lib/src/main/java/org/asamk/signal/manager/groups/GroupId.java b/lib/src/main/java/org/asamk/signal/manager/groups/GroupId.java
new file mode 100644 (file)
index 0000000..f56e5d3
--- /dev/null
+++ b/lib/src/main/java/org/asamk/signal/manager/groups/GroupId.java
@@ -0,0 +1,62 @@
+package org.asamk.signal.manager.groups;
+
+import java.util.Arrays;
+import java.util.Base64;
+
+public abstract class GroupId {
+
+    private final byte[] id;
+
+    public static GroupIdV1 v1(byte[] id) {
+        return new GroupIdV1(id);
+    }
+
+    public static GroupIdV2 v2(byte[] id) {
+        return new GroupIdV2(id);
+    }
+
+    public static GroupId unknownVersion(byte[] id) {
+        if (id.length == 16) {
+            return new GroupIdV1(id);
+        } else if (id.length == 32) {
+            return new GroupIdV2(id);
+        }
+
+        throw new AssertionError("Invalid group id of size " + id.length);
+    }
+
+    public static GroupId fromBase64(String id) throws GroupIdFormatException {
+        try {
+            return unknownVersion(java.util.Base64.getDecoder().decode(id));
+        } catch (Throwable e) {
+            throw new GroupIdFormatException(id, e);
+        }
+    }
+
+    public GroupId(final byte[] id) {
+        this.id = id;
+    }
+
+    public byte[] serialize() {
+        return id;
+    }
+
+    public String toBase64() {
+        return Base64.getEncoder().encodeToString(id);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        final GroupId groupId = (GroupId) o;
+
+        return Arrays.equals(id, groupId.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(id);
+    }
+}