Copyright: add missing headers to tree files

Author: greenrobot-team

objectbox-java/src/main/java/io/objectbox/tree/Branch.java

@@ -1,9 +1,25 @@
-package io.objectbox.tree;
+/*
+ * Copyright 2021 ObjectBox Ltd. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-import io.objectbox.annotation.apihint.Experimental;
+package io.objectbox.tree;
 
 import javax.annotation.Nullable;
 
+import io.objectbox.annotation.apihint.Experimental;
+
 /**
  * A branch within a {@link Tree}. May have {@link #branch(String[]) branches} or {@link #leaf(String[]) leaves}.
  */

objectbox-java/src/main/java/io/objectbox/tree/Leaf.java

@@ -1,10 +1,27 @@
+/*
+ * Copyright 2021 ObjectBox Ltd. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.objectbox.tree;
 
-import io.objectbox.annotation.apihint.Experimental;
-import io.objectbox.model.PropertyType;
+import java.nio.charset.StandardCharsets;
 
 import javax.annotation.Nullable;
-import java.nio.charset.StandardCharsets;
+
+import io.objectbox.annotation.apihint.Experimental;
+import io.objectbox.model.PropertyType;
 
 /**
  * A data leaf represents a data value in a {@link Tree} as a child of a {@link Branch}.

objectbox-java/src/main/java/io/objectbox/tree/LeafNode.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2021 ObjectBox Ltd. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.objectbox.tree;
 
 import io.objectbox.annotation.apihint.Experimental;

objectbox-java/src/main/java/io/objectbox/tree/Tree.java

@@ -1,15 +1,32 @@
+/*
+ * Copyright 2021 ObjectBox Ltd. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.objectbox.tree;
 
+import java.io.Closeable;
+import java.util.concurrent.Callable;
+
+import javax.annotation.Nullable;
+
 import io.objectbox.BoxStore;
 import io.objectbox.InternalAccess;
 import io.objectbox.Transaction;
 import io.objectbox.annotation.apihint.Experimental;
 import io.objectbox.model.PropertyType;
 
-import javax.annotation.Nullable;
-import java.io.Closeable;
-import java.util.concurrent.Callable;
-
 /**
  * A higher level tree API operating on branch and leaf nodes.
  * Points to a root branch, can traverse child branches and read and write data in leafs.