fix nullability and other warnings

Author: greenrobot

objectbox-java/src/main/java/io/objectbox/Box.java

@@ -45,6 +45,7 @@
  */
 @Beta
 @ThreadSafe
+@SuppressWarnings("WeakerAccess,UnusedReturnValue,unused")
 public class Box<T> {
     private final BoxStore store;
     private final Class<T> entityClass;
@@ -427,7 +428,7 @@ public void remove(long id) {
     /**
      * Removes (deletes) Objects by their ID in a single transaction.
      */
-    public void remove(long... ids) {
+    public void remove(@Nullable long... ids) {
         if (ids == null || ids.length == 0) {
             return;
         }

objectbox-java/src/main/java/io/objectbox/Cursor.java

@@ -27,7 +27,7 @@
 import io.objectbox.annotation.apihint.Temporary;
 import io.objectbox.relation.ToMany;
 
-@SuppressWarnings({"unchecked", "SameParameterValue", "unused"})
+@SuppressWarnings({"unchecked", "SameParameterValue", "unused", "WeakerAccess", "UnusedReturnValue"})
 @Beta
 @Internal
 @NotThreadSafe

objectbox-java/src/main/java/io/objectbox/KeyValueCursor.java

@@ -21,6 +21,7 @@
 import javax.annotation.concurrent.NotThreadSafe;
 
 @NotThreadSafe
+@SuppressWarnings("WeakerAccess,UnusedReturnValue, unused")
 public class KeyValueCursor implements Closeable {
     private static final int PUT_FLAG_FIRST = 1;
     private static final int PUT_FLAG_COMPLETE = 1 << 1;

objectbox-java/src/main/java/io/objectbox/Property.java

@@ -19,6 +19,8 @@
 import java.io.Serializable;
 import java.util.Collection;
 
+import javax.annotation.Nullable;
+
 import io.objectbox.annotation.apihint.Internal;
 import io.objectbox.converter.PropertyConverter;
 import io.objectbox.exception.DbException;
@@ -29,6 +31,7 @@
 /**
  * Meta data describing a property
  */
+@SuppressWarnings("WeakerAccess,UnusedReturnValue, unused")
 public class Property<ENTITY> implements Serializable {
     private static final long serialVersionUID = 8613291105982758093L;
 
@@ -56,12 +59,13 @@ public Property(EntityInfo<ENTITY> entity, int ordinal, int id, Class<?> type, S
     }
 
     public Property(EntityInfo<ENTITY> entity, int ordinal, int id, Class<?> type, String name, boolean isId,
-                    String dbName) {
+                    @Nullable String dbName) {
         this(entity, ordinal, id, type, name, isId, dbName, null, null);
     }
 
     public Property(EntityInfo<ENTITY> entity, int ordinal, int id, Class<?> type, String name, boolean isId,
-                    String dbName, Class<? extends PropertyConverter> converterClass, Class customType) {
+                    @Nullable String dbName, @Nullable Class<? extends PropertyConverter> converterClass,
+                    @Nullable Class customType) {
         this.entity = entity;
         this.ordinal = ordinal;
         this.id = id;

objectbox-java/src/main/java/io/objectbox/Transaction.java

@@ -26,6 +26,7 @@
 
 @Internal
 @NotThreadSafe
+@SuppressWarnings("WeakerAccess,UnusedReturnValue,unused")
 public class Transaction implements Closeable {
     /** May be set by tests */
     @Internal

objectbox-java/src/main/java/io/objectbox/query/QueryCondition.java

@@ -49,7 +49,7 @@ abstract class AbstractCondition implements QueryCondition {
             this.values = null;
         }
 
-        AbstractCondition(Object[] values) {
+        AbstractCondition(@Nullable Object[] values) {
             this.value = null;
             this.values = values;
         }
@@ -75,13 +75,13 @@ public enum Operation {
         public final Property property;
         private final Operation operation;
 
-        public PropertyCondition(Property property, Operation operation, Object value) {
+        public PropertyCondition(Property property, Operation operation, @Nullable Object value) {
             super(checkValueForType(property, value));
             this.property = property;
             this.operation = operation;
         }
 
-        public PropertyCondition(Property property, Operation operation, Object[] values) {
+        public PropertyCondition(Property property, Operation operation, @Nullable Object[] values) {
             super(checkValuesForType(property, operation, values));
             this.property = property;
             this.operation = operation;