Modify the SsaColor to be more similar to the Optional class.

library/core/src/main/java/com/google/android/exoplayer2/text/ssa/SsaDecoder.java

@@ -308,8 +308,8 @@ public final class SsaDecoder extends SimpleSubtitleDecoder {
 
     // Apply primary color.
     if (style != null) {
-      if (style.primaryColor.isSet) {
-        spannableText.setSpan(new ForegroundColorSpan(style.primaryColor.value),
+      if (style.primaryColor.isSet()) {
+        spannableText.setSpan(new ForegroundColorSpan(style.primaryColor.getColor()),
             0, spannableText.length(), SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
       }
     }

library/core/src/main/java/com/google/android/exoplayer2/text/ssa/SsaStyle.java

@@ -31,6 +31,7 @@ import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
+import java.util.NoSuchElementException;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -166,14 +167,25 @@ import java.util.regex.Pattern;
 
     public static SsaColor UNSET = new SsaColor(0, false);
 
-    public final @ColorInt int value;
-    public final boolean isSet;
+    private final @ColorInt int color;
+    private final boolean isSet;
 
-    private SsaColor(@ColorInt int value, boolean isSet) {
-      this.value = value;
+    private SsaColor(@ColorInt int color, boolean isSet) {
+      this.color = color;
       this.isSet = isSet;
     }
 
+    public @ColorInt int getColor() {
+      if (!isSet) {
+        throw new NoSuchElementException("No color is present");
+      }
+      return color;
+    }
+
+    public boolean isSet() {
+      return isSet;
+    }
+
     public static SsaColor from(@ColorInt int value) {
       return new SsaColor(value, true);
     }

library/core/src/main/java/com/google/android/exoplayer2/util/ColorParser.java

@@ -90,7 +90,7 @@ public final class ColorParser {
             rgbaStringBuilder.insert(2, "0");
           }
         }
-        abgr = (int) Long.parseLong(colorExpression.substring(2), 16);
+        abgr = (int) Long.parseLong(rgbaStringBuilder.substring(2), 16);
       } else {
         // Parse color from decimal format (bytes order AABBGGRR).
         abgr = (int) Long.parseLong(colorExpression);