DATACMNS-1043 - Slice now exposes Pageable.

We now expose the Pageable that was used to create a Slice via its API. Slice itself constructs a default PageRequest so that current implementations of it still work as before.

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

@@ -15,6 +15,8 @@
  */
 package org.springframework.data.domain;
 
+import lombok.Getter;
+
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -38,7 +40,7 @@ abstract class Chunk<T> implements Slice<T>, Serializable {
 	private static final long serialVersionUID = 867755909294344406L;
 
 	private final List<T> content = new ArrayList<>();
-	private final Pageable pageable;
+	private final @Getter Pageable pageable;
 
 	/**
 	 * Creates a new {@link Chunk} with the given content and the given governing {@link Pageable}.

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

@@ -100,6 +100,16 @@ public interface Slice<T> extends Streamable<T> {
 	 */
 	boolean hasPrevious();
 
+	/**
+	 * Returns the {@link Pageable} that's been used to request the current {@link Slice}.
+	 * 
+	 * @return
+	 * @since 2.0
+	 */
+	default Pageable getPageable() {
+		return PageRequest.of(getNumber(), getSize(), getSort());
+	}
+
 	/**
 	 * Returns the {@link Pageable} to request the next {@link Slice}. Can be {@literal null} in case the current
 	 * {@link Slice} is already the last one. Clients should check {@link #hasNext()} before calling this method to make