Fix API issues in DrmRights class.

o account id and subscription id are not mandatory, and thus can be anything
  such as null or an empty string.
o removed unnecessary or thus inconsistent checks for account id and subscription id
o updated the javadoc to specify that mimeType could not be null or an empty string.

Change-Id: I704f1dd7fc5d33060da908aae0469d560c7db036

1 files changed, 22 insertions, 33 deletions

diff --git a/drm/java/android/drm/DrmRights.java b/drm/java/android/drm/DrmRights.java
index d4afed1..a9b4f05 100755
--- a/drm/java/android/drm/DrmRights.java
+++ b/drm/java/android/drm/DrmRights.java
@@ -30,19 +30,24 @@ import java.io.IOException;
  * A caller can also instantiate a {@link DrmRights} object by using the
  * {@link DrmRights#DrmRights(String, String)} constructor, which takes a path to a file
  * containing rights information instead of a <code>ProcessedData</code>.
+ *<p>
+ * Please note that the account id and subscription id is not mandatory by all DRM agents
+ * or plugins. When account id or subscription id is not required by the specific DRM
+ * agent or plugin, they can be either null, or an empty string, or any other don't-care
+ * string value.
  *
  */
 public class DrmRights {
     private byte[] mData;
     private String mMimeType;
-    private String mAccountId = "_NO_USER";
-    private String mSubscriptionId = "";
+    private String mAccountId;
+    private String mSubscriptionId;
 
     /**
      * Creates a <code>DrmRights</code> object with the given parameters.
      *
      * @param rightsFilePath Path to the file containing rights information.
-     * @param mimeType MIME type.
+     * @param mimeType MIME type. Must not be null or an empty string.
      */
     public DrmRights(String rightsFilePath, String mimeType) {
         File file = new File(rightsFilePath);
@@ -53,22 +58,20 @@ public class DrmRights {
      * Creates a <code>DrmRights</code> object with the given parameters.
      *
      * @param rightsFilePath Path to the file containing rights information.
-     * @param mimeType MIME type.
+     * @param mimeType MIME type. Must not be null or an empty string.
      * @param accountId Account ID of the user.
      */
     public DrmRights(String rightsFilePath, String mimeType, String accountId) {
         this(rightsFilePath, mimeType);
 
-        if (null != accountId && !accountId.equals("")) {
-            mAccountId = accountId;
-        }
+        mAccountId = accountId;
     }
 
     /**
      * Creates a <code>DrmRights</code> object with the given parameters.
      *
      * @param rightsFilePath Path to the file containing rights information.
-     * @param mimeType MIME type.
+     * @param mimeType MIME type. Must not be null or an empty string.
      * @param accountId Account ID of the user.
      * @param subscriptionId Subscription ID of the user.
      */
@@ -76,20 +79,15 @@ public class DrmRights {
             String rightsFilePath, String mimeType, String accountId, String subscriptionId) {
         this(rightsFilePath, mimeType);
 
-        if (null != accountId && !accountId.equals("")) {
-            mAccountId = accountId;
-        }
-
-        if (null != subscriptionId && !subscriptionId.equals("")) {
-            mSubscriptionId = subscriptionId;
-        }
+        mAccountId = accountId;
+        mSubscriptionId = subscriptionId;
     }
 
     /**
      * Creates a <code>DrmRights</code> object with the given parameters.
      *
      * @param rightsFile File containing rights information.
-     * @param mimeType MIME type.
+     * @param mimeType MIME type. Must not be null or an empty string.
      */
     public DrmRights(File rightsFile, String mimeType) {
         instantiate(rightsFile, mimeType);
@@ -114,28 +112,19 @@ public class DrmRights {
      * Creates a <code>DrmRights</code> object with the given parameters.
      *
      * @param data A {@link ProcessedData} object containing rights information.
-     *             data could be null because it's optional for some DRM schemes.
-     * @param mimeType The MIME type.
+     *             Must not be null.
+     * @param mimeType The MIME type. It must not be null or an empty string.
      */
     public DrmRights(ProcessedData data, String mimeType) {
-        if (data != null) {
-            mData = data.getData();
-
-            String accountId = data.getAccountId();
-            if (null == accountId || !accountId.equals("")) {
-                throw new IllegalArgumentException("accountId: " + accountId);
-            }
-            mAccountId = accountId;
-
-            String subscriptionId = data.getSubscriptionId();
-            if (null == subscriptionId || !subscriptionId.equals("")) {
-                throw new IllegalArgumentException(
-                            "subscriptionId: " + subscriptionId);
-            }
-            mSubscriptionId = subscriptionId;
+        if (data == null) {
+            throw new IllegalArgumentException("data is null");
         }
 
+        mData = data.getData();
+        mAccountId = data.getAccountId();
+        mSubscriptionId = data.getSubscriptionId();
         mMimeType = mimeType;
+
         if (!isValid()) {
             final String msg = "mimeType: " + mMimeType + "," +
                                "data: " + mData;