Add documentation to Profile class

sop-java/src/main/java/sop/Profile.java

@@ -4,6 +4,8 @@
 
 package sop;
 
+import java.nio.charset.Charset;
+
 /**
  * Tuple class bundling a profile name and description.
  *
@@ -15,20 +17,66 @@ public class Profile {
     private final String name;
     private final String description;
 
+    /**
+     * Create a new {@link Profile} object.
+     * The {@link #toString()} representation MUST NOT exceed a length of 1000 bytes.
+     *
+     * @param name profile name
+     * @param description profile description
+     */
     public Profile(String name, String description) {
         this.name = name;
         this.description = description;
+
+        if (exceeds1000CharLineLimit(this)) {
+            throw new IllegalArgumentException("The line representation of a profile MUST NOT exceed 1000 bytes.");
+        }
     }
 
+    /**
+     * Return the name (also known as identifier) of the profile.
+     * A profile name is a UTF-8 string that has no whitespace in it.
+     * Similar to OpenPGP Notation names, profile names are divided into two namespaces:
+     * The IETF namespace and the user namespace.
+     * A profile name in the user namespace ends with the <pre>@</pre> character (0x40) followed by a DNS domain name.
+     * A profile name in the IETF namespace does not have an <pre>@</pre> character.
+     * A profile name in the user space is owned and controlled by the owner of the domain in the suffix.
+     * A profile name in the IETF namespace that begins with the string <pre>rfc</pre> should have semantics that hew as
+     * closely as possible to the referenced RFC.
+     * Similarly, a profile name in the IETF namespace that begins with the string <pre>draft-</pre> should have
+     * semantics that hew as closely as possible to the referenced Internet Draft.
+     *
+     * @return name
+     */
     public String getName() {
         return name;
     }
 
+    /**
+     * Return a free-form description of the profile.
+     *
+     * @return description
+     */
     public String getDescription() {
         return description;
     }
 
+    /**
+     * Convert the profile into a String for displaying.
+     *
+     * @return string
+     */
     public String toString() {
         return getName() + ": " + getDescription();
     }
+
+    /**
+     * Test if the string representation of the profile exceeds the limit of 1000 bytes length.
+     * @param profile profile
+     * @return <pre>true</pre> if the profile exceeds 1000 bytes, <pre>false</pre> otherwise.
+     */
+    private static boolean exceeds1000CharLineLimit(Profile profile) {
+        String line = profile.toString();
+        return line.getBytes(Charset.forName("UTF8")).length > 1000;
+    }
 }