DATACMNS-1327 - Prevent int overflow in AbstractPageRequest#getOffset().

Original pull request: #291.

Author: CaH9I

src/main/java/org/springframework/data/domain/AbstractPageRequest.java

@@ -24,6 +24,7 @@
  *
  * @author Thomas Darimont
  * @author Oliver Gierke
+ * @author Alex Bondarev
  */
 public abstract class AbstractPageRequest implements Pageable, Serializable {
 
@@ -74,7 +75,7 @@ public int getPageNumber() {
 	 * @see org.springframework.data.domain.Pageable#getOffset()
 	 */
 	public long getOffset() {
-		return page * size;
+		return (long) page * (long) size;
 	}
 
 	/*

src/test/java/org/springframework/data/domain/AbstractPageRequestUnitTests.java

@@ -22,6 +22,7 @@
 
 /**
  * @author Thomas Darimont
+ * @author Alex Bondarev
  */
 public abstract class AbstractPageRequestUnitTests {
 
@@ -75,4 +76,12 @@ public void equalsHonoursPageAndSize() {
 	public void preventsPageSizeLessThanOne() {
 		newPageRequest(0, 0);
 	}
+
+	@Test
+	public void getOffsetShouldNotCauseOverflow() {
+
+		AbstractPageRequest request = newPageRequest(Integer.MAX_VALUE, Integer.MAX_VALUE);
+
+		assertThat(request.getOffset()).isGreaterThan(Integer.MAX_VALUE);
+	}
 }