[libvirt] [java] [PATCH 2/2] Fix compilation error when using -source 1.x

[Claudio Bley]

When using JDK 1.8 with the compiler option `-source 1.6` or `-source
1.7` or JDK 1.7 with the `-source 1.6` compiler option, compilation
failed with:

```
src/main/java/org/libvirt/event/DomainEvent.java:63: error: incompatible types: inference variable T#1 has incompatible upper bounds Enum<T#2>,T#3
        return this.type.obtain(this.detail);
                               ^
  where T#1,T#2,T#3 are type-variables:
    T#1 extends Enum<T#1> declared in method <T#1>obtain(int)
    T#2 extends T#3
    T#3 extends Enum<T#3>,DomainEventDetail declared in method <T#3>getDetail()
```

Actually, it compiles just fine using a 1.6, 1.7 or 1.8 Java compiler
when omitting the -source option.

Remove the `obtain` method altogether and use the `safeAt` method
directly instead.
---
 src/main/java/org/libvirt/event/DomainEvent.java     | 4 +++-
 src/main/java/org/libvirt/event/DomainEventType.java | 7 -------
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/src/main/java/org/libvirt/event/DomainEvent.java b/src/main/java/org/libvirt/event/DomainEvent.java
index 21fac60..56234ad 100644
--- a/src/main/java/org/libvirt/event/DomainEvent.java
+++ b/src/main/java/org/libvirt/event/DomainEvent.java
@@ -60,7 +60,9 @@ public final class DomainEvent {
      *         {@link DomainEventDetail} interface
      */
     public <T extends Enum<T> & DomainEventDetail> T getDetail() {
-        return this.type.obtain(this.detail);
+        @SuppressWarnings("unchecked") T detail = (T)this.type.safeAt(this.detail);
+
+        return detail;
     }
 
     @Override
diff --git a/src/main/java/org/libvirt/event/DomainEventType.java b/src/main/java/org/libvirt/event/DomainEventType.java
index b675d8b..c42043d 100644
--- a/src/main/java/org/libvirt/event/DomainEventType.java
+++ b/src/main/java/org/libvirt/event/DomainEventType.java
@@ -46,13 +46,6 @@ public enum DomainEventType {
         details = d;
     }
 
-    @SuppressWarnings("unchecked")
-    <T extends Enum<T>> T obtain(final int detail) {
-        return (T)safeAt(detail);
-    }
-
-    // this method is only necessary for OpenJDK 6 which does not
-    // compile calls to `obtain(d)` in some circumstances
     Object safeAt(final int detail) {
         final int index = Math.min(this.details.length - 1, detail);
         return this.details[index];
-- 
2.5.1