Annotate nullable methods on ParseObject

This makes the object linter/Kotlin friendly.

Author: kurtisnelson

Parse/src/main/java/com/parse/ParseObject.java

@@ -11,6 +11,8 @@
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.util.Log;
 
 import org.json.JSONArray;
@@ -3168,6 +3170,7 @@ public boolean containsKey(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link String}.
    */
+  @Nullable
   public String getString(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3186,6 +3189,7 @@ public String getString(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@code byte[]}.
    */
+  @Nullable
   public byte[] getBytes(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3205,6 +3209,7 @@ public byte[] getBytes(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link Number}.
    */
+  @Nullable
   public Number getNumber(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3223,6 +3228,7 @@ public Number getNumber(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link JSONArray}.
    */
+  @Nullable
   public JSONArray getJSONArray(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3247,6 +3253,7 @@ public JSONArray getJSONArray(String key) {
    * @return {@code null} if there is no such key or if the value can't be converted to a
    *          {@link List}.
    */
+  @Nullable
   public <T> List<T> getList(String key) {
     synchronized (mutex) {
       Object value = estimatedData.get(key);
@@ -3267,6 +3274,7 @@ public <T> List<T> getList(String key) {
    * @return {@code null} if there is no such key or if the value can't be converted to a
    *          {@link Map}.
    */
+  @Nullable
   public <V> Map<String, V> getMap(String key) {
     synchronized (mutex) {
       Object value = estimatedData.get(key);
@@ -3286,6 +3294,7 @@ public <V> Map<String, V> getMap(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link JSONObject}.
    */
+  @Nullable
   public JSONObject getJSONObject(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3373,6 +3382,7 @@ public boolean getBoolean(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link Date}.
    */
+  @Nullable
   public Date getDate(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3394,6 +3404,7 @@ public Date getDate(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@code ParseObject}.
    */
+  @Nullable
   public ParseObject getParseObject(String key) {
     Object value = get(key);
     if (!(value instanceof ParseObject)) {
@@ -3412,6 +3423,7 @@ public ParseObject getParseObject(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if the value is not a {@link ParseUser}.
    */
+  @Nullable
   public ParseUser getParseUser(String key) {
     Object value = get(key);
     if (!(value instanceof ParseUser)) {
@@ -3429,6 +3441,7 @@ public ParseUser getParseUser(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key or if it is not a {@link ParseFile}.
    */
+  @Nullable
   public ParseFile getParseFile(String key) {
     Object value = get(key);
     if (!(value instanceof ParseFile)) {
@@ -3444,6 +3457,7 @@ public ParseFile getParseFile(String key) {
    *          The key to access the value for
    * @return {@code null} if there is no such key or if it is not a {@link ParseGeoPoint}.
    */
+  @Nullable
   public ParseGeoPoint getParseGeoPoint(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3462,6 +3476,7 @@ public ParseGeoPoint getParseGeoPoint(String key) {
    *          The key to access the value for
    * @return {@code null} if there is no such key or if it is not a {@link ParsePolygon}.
    */
+  @Nullable
   public ParsePolygon getParsePolygon(String key) {
     synchronized (mutex) {
       checkGetAccess(key);
@@ -3476,6 +3491,7 @@ public ParsePolygon getParsePolygon(String key) {
   /**
    * Access the {@link ParseACL} governing this object.
    */
+  @Nullable
   public ParseACL getACL() {
     return getACL(true);
   }
@@ -3540,6 +3556,7 @@ public boolean isDataAvailable(String key) {
    * @return the ParseRelation object if the relation already exists for the key or can be created
    *         for this key.
    */
+  @NonNull
   public <T extends ParseObject> ParseRelation<T> getRelation(String key) {
     synchronized (mutex) {
       // All the sanity checking is done when add or remove is called on the relation.
@@ -3573,6 +3590,7 @@ public <T extends ParseObject> ParseRelation<T> getRelation(String key) {
    *          The key to access the value for.
    * @return {@code null} if there is no such key.
    */
+  @Nullable
   public Object get(String key) {
     synchronized (mutex) {
       if (key.equals(KEY_ACL)) {