Converted Group from an interface to an immutable class.

briar-api/src/net/sf/briar/api/protocol/Group.java

@@ -1,17 +1,43 @@
 package net.sf.briar.api.protocol;
 
 /** A group to which users may subscribe. */
-public interface Group {
+public class Group {
+
+	private final GroupId id;
+	private final String name;
+	private final byte[] publicKey;
+
+	public Group(GroupId id, String name, byte[] publicKey) {
+		this.id = id;
+		this.name = name;
+		this.publicKey = publicKey;
+	}
 
 	/** Returns the group's unique identifier. */
-	GroupId getId();
+	public GroupId getId() {
+		return id;
+	}
 
 	/** Returns the group's name. */
-	String getName();
+	public String getName() {
+		return name;
+	}
 
 	/**
 	 * If the group is restricted, returns the public key that is used to
 	 * authorise all messages sent to the group. Otherwise returns null.
 	 */
-	byte[] getPublicKey();
+	public byte[] getPublicKey() {
+		return publicKey;
+	}
+
+	@Override
+	public int hashCode() {
+		return id.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		return o instanceof Group && id.equals(((Group) o).id);
+	}
 }

briar-api/src/net/sf/briar/api/protocol/GroupFactory.java

@@ -5,6 +5,4 @@ import java.io.IOException;
 public interface GroupFactory {
 
 	Group createGroup(String name, byte[] publicKey) throws IOException;
-
-	Group createGroup(GroupId id, String name, byte[] publicKey);
 }