Fix conversion issues in MutableOptions (#9194)

Summary:
Removing unnecessary checks around conversion from int/long to double as it does not lose information (see https://docs.oracle.com/javase/specs/jls/se9/html/jls-5.html#jls-5.1.2).

For example, `value > Double.MAX_VALUE` is always false when value is long or int.

Can you please have a look adamretter? Also fixed some other minor issues (do you prefer a separate PR?)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9194

Reviewed By: ajkr

Differential Revision: D36221694

fbshipit-source-id: bf327c07386560b87ddc0c98039e8d6e8f2f1e82

java/src/main/java/org/rocksdb/AbstractMutableOptions.java

@@ -81,8 +81,8 @@ public abstract class AbstractMutableOptions {
     protected abstract T build(final String[] keys, final String[] values);
 
     public T build() {
-      final String keys[] = new String[options.size()];
+      final String[] keys = new String[options.size()];
-      final String values[] = new String[options.size()];
+      final String[] values = new String[options.size()];
 
       int i = 0;
       for (final Map.Entry<K, MutableOptionValue<?>> option : options.entrySet()) {
@@ -227,7 +227,7 @@ public abstract class AbstractMutableOptions {
       } catch (NumberFormatException nfe) {
         final double doubleValue = Double.parseDouble(value);
         if (doubleValue != Math.round(doubleValue))
-          throw new IllegalArgumentException("Unable to parse or round " + value + " to int");
+          throw new IllegalArgumentException("Unable to parse or round " + value + " to long");
         return Math.round(doubleValue);
       }
     }
@@ -245,7 +245,7 @@ public abstract class AbstractMutableOptions {
       } catch (NumberFormatException nfe) {
         final double doubleValue = Double.parseDouble(value);
         if (doubleValue != Math.round(doubleValue))
-          throw new IllegalArgumentException("Unable to parse or round " + value + " to long");
+          throw new IllegalArgumentException("Unable to parse or round " + value + " to int");
         return (int) Math.round(doubleValue);
       }
     }

java/src/main/java/org/rocksdb/MutableOptionValue.java

@@ -17,7 +17,7 @@ public abstract class MutableOptionValue<T> {
       extends MutableOptionValue<T> {
     protected final T value;
 
-    private MutableOptionValueObject(final T value) {
+    protected MutableOptionValueObject(final T value) {
       this.value = value;
     }
 
@@ -153,10 +153,6 @@ public abstract class MutableOptionValue<T> {
 
     @Override
     double asDouble() {
-      if(value > Double.MAX_VALUE || value < Double.MIN_VALUE) {
-        throw new NumberFormatException(
-            "long value lies outside the bounds of int");
-      }
       return Long.valueOf(value).doubleValue();
     }
 
@@ -210,9 +206,6 @@ public abstract class MutableOptionValue<T> {
 
     @Override
     double asDouble() {
-      if(value > Double.MAX_VALUE || value < Double.MIN_VALUE) {
-        throw new NumberFormatException("int value lies outside the bounds of int");
-      }
       return Integer.valueOf(value).doubleValue();
     }