mybatis#437: Polishing some logics and comments

* modify to use Cursor.class.isAssignableFrom(Class<?>)
* modfiy to use ExceptionFactory.wrapException(String,Exception)
* modify copyright year

src/main/java/org/apache/ibatis/binding/MapperMethod.java

@@ -35,6 +35,7 @@
  * @author Clinton Begin
  * @author Eduardo Macarron
  * @author Lasse Voss
+ * @author Kazuki Shimizu
  */
 public class MapperMethod {
 
@@ -245,7 +246,7 @@ public MethodSignature(Configuration configuration, Method method) {
       this.returnType = method.getReturnType();
       this.returnsVoid = void.class.equals(this.returnType);
       this.returnsMany = (configuration.getObjectFactory().isCollection(this.returnType) || this.returnType.isArray());
-      this.returnsCursor = Cursor.class.equals(this.returnType);
+      this.returnsCursor = Cursor.class.isAssignableFrom(this.returnType);
       this.mapKey = getMapKey(method);
       this.returnsMap = (this.mapKey != null);
       this.hasNamedParameters = hasNamedParams(method);

src/main/java/org/apache/ibatis/cursor/defaults/DefaultCursor.java

@@ -16,6 +16,8 @@
 package org.apache.ibatis.cursor.defaults;
 
 import org.apache.ibatis.cursor.Cursor;
+import org.apache.ibatis.exceptions.ExceptionFactory;
+import org.apache.ibatis.executor.ErrorContext;
 import org.apache.ibatis.executor.resultset.DefaultResultSetHandler;
 import org.apache.ibatis.executor.resultset.ResultSetWrapper;
 import org.apache.ibatis.mapping.ResultMap;
@@ -31,6 +33,7 @@
 
 /**
  * @author Guillaume Darmont / [email protected]
+ * @author Kazuki Shimizu
  */
 public class DefaultCursor<T> implements Cursor<T> {
 
@@ -111,7 +114,7 @@ protected T fetchNextObjectFromDatabase() {
             opened = true;
             resultSetHandler.handleRowValues(rsw, resultMap, objectWrapperResultHandler, RowBounds.DEFAULT, null);
         } catch (SQLException e) {
-            throw new RuntimeException(e);
+            ExceptionFactory.wrapException("Error fetching next object from database at the DefaultCursor.", e);
         }
 
         T next = objectWrapperResultHandler.result;
@@ -160,7 +163,11 @@ public CursorIterator() {
         @Override
         public boolean hasNext() {
             if (object == null) {
-                object = fetchNextUsingRowBound();
+                try {
+                    object = fetchNextUsingRowBound();
+                } finally {
+                    ErrorContext.instance().reset();
+                }
             }
             return object != null;
         }
@@ -171,7 +178,11 @@ public T next() {
             T next = object;
 
             if (next == null) {
-                next = fetchNextUsingRowBound();
+                try {
+                    next = fetchNextUsingRowBound();
+                } finally {
+                    ErrorContext.instance().reset();
+                }
             }
 
             if (next != null) {

src/test/java/org/apache/ibatis/submitted/cursor_nested/CreateDB.sql

@@ -1,6 +1,6 @@
 
 --
---    Copyright 2009-2012 The MyBatis Team
+--    Copyright 2009-2015 The MyBatis Team
 --
 --    Licensed under the Apache License, Version 2.0 (the "License");
 --    you may not use this file except in compliance with the License.

src/test/java/org/apache/ibatis/submitted/cursor_nested/Mapper.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-       Copyright 2009-2012 The MyBatis Team
+       Copyright 2009-2015 The MyBatis Team
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.

src/test/java/org/apache/ibatis/submitted/cursor_nested/mybatis-config.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!--
-       Copyright 2009-2012 The MyBatis Team
+       Copyright 2009-2015 The MyBatis Team
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.

src/test/java/org/apache/ibatis/submitted/cursor_simple/CreateDB.sql

@@ -1,5 +1,5 @@
 --
---    Copyright 2009-2012 The MyBatis Team
+--    Copyright 2009-2015 The MyBatis Team
 --
 --    Licensed under the Apache License, Version 2.0 (the "License");
 --    you may not use this file except in compliance with the License.

src/test/java/org/apache/ibatis/submitted/cursor_simple/Mapper.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-       Copyright 2009-2012 The MyBatis Team
+       Copyright 2009-2015 The MyBatis Team
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.

src/test/java/org/apache/ibatis/submitted/cursor_simple/mybatis-config.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!--
-       Copyright 2009-2012 The MyBatis Team
+       Copyright 2009-2015 The MyBatis Team
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.