javadocs, cleanup, checkstyle and license fix

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/CursorFactory.java

@@ -19,6 +19,10 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * Allocates Cursors. To read data from the Kernel, Cursors are needed. A Cursor factory let's the Kernel consumer
+ * allocate all types of cursors, which can then be reused for multiple read operations.
+ */
 public interface CursorFactory
 {
     // entities

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/ExplicitIndexCursor.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * A cursor for accessing data in an explicit index.
+ */
 interface ExplicitIndexCursor
 {
     int totalExpectedCursorSize();

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/ExplicitIndexRead.java

@@ -22,6 +22,9 @@
 import org.neo4j.internal.kernel.api.exceptions.KernelException;
 import org.neo4j.values.storable.Value;
 
+/**
+ * Operations for querying and seeking in explicit indexes.
+ */
 public interface ExplicitIndexRead
 {
     void nodeExplicitIndexLookup( NodeExplicitIndexCursor cursor, String index, String key, Value value )

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/Kernel.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * The Kernel.
+ */
 public interface Kernel
 {
     CursorFactory cursors();

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/Locks.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * Methods for acquiring and releasing locks.
+ */
 public interface Locks
 {
 }

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/Read.java

@@ -20,7 +20,7 @@
 package org.neo4j.internal.kernel.api;
 
 /**
- * Defines the read operations of the Kernel API.
+ * Defines the graph read operations of the Kernel.
  */
 public interface Read
 {

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/SchemaRead.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * Surface for getting schema information, such as fetching specific indexes or constraints.
+ */
 public interface SchemaRead
 {
     IndexReference index( int label, int... properties );

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/SchemaWrite.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * Surface for creating and dropping indexes and constraints.
+ */
 public interface SchemaWrite
 {
 }

community/kernel-api/src/main/java/org/neo4j/internal/kernel/api/Session.java

@@ -19,6 +19,9 @@
  */
 package org.neo4j.internal.kernel.api;
 
+/**
+ * A Session is used to gain
+ */
 public interface Session extends AutoCloseable
 {
     Transaction beginTransaction();