Flip null test

Author: garydgregory

doc/ReaderUtil.java

@@ -60,7 +60,7 @@ public String readToString(Reader in)
                 // ignored
             }
             try {
-                if (null != buf) {
+                if (buf != null) {
                     pool.returnObject(buf);
                 }
             } catch (Exception e) {

src/main/java/org/apache/commons/pool2/impl/GenericKeyedObjectPool.java

@@ -941,7 +941,7 @@ private void deregister(final K k) {
                 // Pool may have changed since we released the read lock
                 // numInterested decrement could lead to removal while waiting for write lock
                 objectDeque = poolMap.get(k);
-                if (null != objectDeque && objectDeque.getNumInterested().get() == 0 && objectDeque.getCreateCount().get() == 0) {
+                if (objectDeque != null && objectDeque.getNumInterested().get() == 0 && objectDeque.getCreateCount().get() == 0) {
                     // NOTE: Keys must always be removed from both poolMap and
                     // poolKeyList at the same time while protected by
                     // keyLock.writeLock()

src/main/java/org/apache/commons/pool2/impl/SoftReferenceObjectPool.java

@@ -199,7 +199,7 @@ public synchronized T borrowObject() throws Exception {
                 ref.getReference().clear();
                 ref.setReference(new SoftReference<>(obj));
             }
-            if (null != factory && null != obj) {
+            if (factory != null && obj != null) {
                 try {
                     factory.activateObject(ref);
                     if (!factory.validateObject(ref)) {
@@ -231,10 +231,10 @@ public synchronized T borrowObject() throws Exception {
      */
     @Override
     public synchronized void clear() {
-        if (null != factory) {
+        if (factory != null) {
             idleReferences.forEach(ref -> {
                 try {
-                    if (null != ref.getObject()) {
+                    if (ref.getObject() != null) {
                         factory.destroyObject(ref);
                     }
                 } catch (final Exception ignored) {