Polishing.

Introduce factory methods on Pageable, PageRequest, and QPageRequest to construct PageRequest objects. Replace builder with with…(…) methods.

Closes #322.

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

@@ -24,6 +24,8 @@ import org.springframework.util.Assert;
  *
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Anastasiia Smirnova
+ * @author Mark Paluch
  */
 public class PageRequest extends AbstractPageRequest {
 
@@ -83,8 +85,15 @@ public class PageRequest extends AbstractPageRequest {
 		return of(page, size, Sort.by(direction, properties));
 	}
 
-	public static PageRequestBuilder pageRequest() {
-		return new PageRequestBuilder();
+	/**
+	 * Creates a new {@link PageRequest} for the first page (page number {@code 0}) given {@code pageSize} .
+	 *
+	 * @param pageSize the size of the page to be returned, must be greater than 0.
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	public static PageRequest ofSize(int pageSize) {
+		return PageRequest.of(0, pageSize);
 	}
 
 	/*
@@ -142,6 +151,41 @@ public class PageRequest extends AbstractPageRequest {
 		return super.equals(that) && this.sort.equals(that.sort);
 	}
 
+	/**
+	 * Creates a new {@link PageRequest} with {@code pageNumber} applied.
+	 *
+	 * @param pageNumber
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	@Override
+	public PageRequest withPage(int pageNumber) {
+		return new PageRequest(pageNumber, getPageSize(), getSort());
+	}
+
+	/**
+	 * Creates a new {@link PageRequest} with {@link Direction} and {@code properties} applied.
+	 *
+	 * @param direction must not be {@literal null}.
+	 * @param properties must not be {@literal null}.
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	public PageRequest withSort(Direction direction, String... properties) {
+		return new PageRequest(getPageNumber(), getPageSize(), Sort.by(direction, properties));
+	}
+
+	/**
+	 * Creates a new {@link PageRequest} with {@link Sort} applied.
+	 *
+	 * @param sort must not be {@literal null}.
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	public PageRequest withSort(Sort sort) {
+		return new PageRequest(getPageNumber(), getPageSize(), sort);
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see java.lang.Object#hashCode()
@@ -160,29 +204,4 @@ public class PageRequest extends AbstractPageRequest {
 		return String.format("Page request [number: %d, size %d, sort: %s]", getPageNumber(), getPageSize(), sort);
 	}
 
-	public static final class PageRequestBuilder {
-
-		private Sort sort = Sort.unsorted();
-		private int page;
-		private int size;
-
-		public PageRequestBuilder sort(Sort sort) {
-			this.sort = sort;
-			return this;
-		}
-
-		public PageRequestBuilder page(int page) {
-			this.page = page;
-			return this;
-		}
-
-		public PageRequestBuilder size(int size) {
-			this.size = size;
-			return this;
-		}
-
-		public PageRequest build() {
-			return PageRequest.of(page, size, sort);
-		}
-	}
 }

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

@@ -23,6 +23,7 @@ import org.springframework.util.Assert;
  * Abstract interface for pagination information.
  *
  * @author Oliver Gierke
+ * @author Mark Paluch
  */
 public interface Pageable {
 
@@ -35,6 +36,17 @@ public interface Pageable {
 		return Unpaged.INSTANCE;
 	}
 
+	/**
+	 * Creates a new {@link Pageable} for the first page (page number {@code 0}) given {@code pageSize} .
+	 *
+	 * @param pageSize the size of the page to be returned, must be greater than 0.
+	 * @return a new {@link Pageable}.
+	 * @since 2.5
+	 */
+	static Pageable ofSize(int pageSize) {
+		return PageRequest.of(0, pageSize);
+	}
+
 	/**
 	 * Returns whether the current {@link Pageable} contains pagination information.
 	 *
@@ -115,6 +127,15 @@ public interface Pageable {
 	 */
 	Pageable first();
 
+	/**
+	 * Creates a new {@link Pageable} with {@code pageNumber} applied.
+	 *
+	 * @param pageNumber
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	Pageable withPage(int pageNumber);
+
 	/**
 	 * Returns whether there's a previous {@link Pageable} we can access from the current one. Will return
 	 * {@literal false} in case the current {@link Pageable} already refers to the first page.
@@ -131,4 +152,5 @@ public interface Pageable {
 	default Optional<Pageable> toOptional() {
 		return isUnpaged() ? Optional.empty() : Optional.of(this);
 	}
+
 }

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

@@ -104,4 +104,19 @@ enum Unpaged implements Pageable {
 	public Pageable first() {
 		return this;
 	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.domain.Pageable#withPage(int)
+	 */
+	@Override
+	public Pageable withPage(int pageNumber) {
+
+		if (pageNumber == 0) {
+			return this;
+		}
+
+		throw new UnsupportedOperationException();
+	}
+
 }

src/main/java/org/springframework/data/querydsl/QPageRequest.java

@@ -16,6 +16,7 @@
 package org.springframework.data.querydsl;
 
 import org.springframework.data.domain.AbstractPageRequest;
+import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
 import org.springframework.util.Assert;
@@ -27,6 +28,7 @@ import com.querydsl.core.types.OrderSpecifier;
  *
  * @author Thomas Darimont
  * @author Oliver Drotbohm
+ * @author Mark Paluch
  */
 public class QPageRequest extends AbstractPageRequest {
 
@@ -114,6 +116,17 @@ public class QPageRequest extends AbstractPageRequest {
 		return new QPageRequest(page, size, sort);
 	}
 
+	/**
+	 * Creates a new {@link QPageRequest} for the first page (page number {@code 0}) given {@code pageSize} .
+	 *
+	 * @param pageSize the size of the page to be returned, must be greater than 0.
+	 * @return a new {@link QPageRequest}.
+	 * @since 2.5
+	 */
+	public static QPageRequest ofSize(int pageSize) {
+		return QPageRequest.of(0, pageSize);
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see org.springframework.data.domain.Pageable#getSort()
@@ -149,4 +162,27 @@ public class QPageRequest extends AbstractPageRequest {
 	public Pageable first() {
 		return QPageRequest.of(0, getPageSize(), sort);
 	}
+
+	/**
+	 * Creates a new {@link QPageRequest} with {@code pageNumber} applied.
+	 *
+	 * @param pageNumber
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	@Override
+	public QPageRequest withPage(int pageNumber) {
+		return new QPageRequest(pageNumber, getPageSize(), sort);
+	}
+
+	/**
+	 * Creates a new {@link QPageRequest} with {@link QSort} applied.
+	 *
+	 * @param sort must not be {@literal null}.
+	 * @return a new {@link PageRequest}.
+	 * @since 2.5
+	 */
+	public QPageRequest withSort(QSort sort) {
+		return new QPageRequest(getPageNumber(), getPageSize(), sort);
+	}
 }

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

@@ -49,7 +49,7 @@ public abstract class AbstractPageRequestUnitTests {
 		Pageable first = request.previousOrFirst();
 
 		assertThat(first.hasPrevious()).isFalse();
-		assertThat(first).isEqualTo((Pageable) newPageRequest(0, 10));
+		assertThat(first).isEqualTo(newPageRequest(0, 10));
 		assertThat(first).isEqualTo(request.first());
 		assertThat(first.previousOrFirst()).isEqualTo(first);
 	}

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

@@ -16,16 +16,18 @@
 package org.springframework.data.domain;
 
 import static org.assertj.core.api.Assertions.*;
-import static org.springframework.data.domain.PageRequest.pageRequest;
 import static org.springframework.data.domain.UnitTestUtils.*;
 
 import org.junit.jupiter.api.Test;
+
 import org.springframework.data.domain.Sort.Direction;
 
 /**
  * Unit test for {@link PageRequest}.
  *
  * @author Oliver Gierke
+ * @author Anastasiia Smirnova
+ * @author Mark Paluch
  */
 class PageRequestUnitTests extends AbstractPageRequestUnitTests {
 
@@ -38,30 +40,29 @@ class PageRequestUnitTests extends AbstractPageRequestUnitTests {
 		return PageRequest.of(page, size);
 	}
 
-	AbstractPageRequest newPageRequest(int page, int size, Sort sort) {
-		return PageRequest.of(page, size, sort);
-	}
-
 	@Test
 	void equalsRegardsSortCorrectly() {
 
 		Sort sort = Sort.by(Direction.DESC, "foo");
-		AbstractPageRequest request = pageRequest().page(0).size(10).sort(sort).build();
+		AbstractPageRequest request = PageRequest.ofSize(10).withPage(1).withSort(sort);
 
 		// Equals itself
 		assertEqualsAndHashcode(request, request);
 
 		// Equals another instance with same setup
-		assertEqualsAndHashcode(request, PageRequest.of(0, 10, sort));
+		assertEqualsAndHashcode(request, PageRequest.of(1, 10, sort));
+
+		// Equals another instance with same sort by properties
+		assertEqualsAndHashcode(request, PageRequest.ofSize(10).withPage(1).withSort(Direction.DESC, "foo"));
 
 		// Equals without sort entirely
 		assertEqualsAndHashcode(PageRequest.of(0, 10), PageRequest.of(0, 10));
 
 		// Is not equal to instance without sort
-		assertNotEqualsAndHashcode(request, PageRequest.of(0, 10));
+		assertNotEqualsAndHashcode(request, PageRequest.of(1, 10));
 
 		// Is not equal to instance with another sort
-		assertNotEqualsAndHashcode(request, PageRequest.of(0, 10, Direction.ASC, "foo"));
+		assertNotEqualsAndHashcode(request, PageRequest.of(1, 10, Direction.ASC, "foo"));
 	}
 
 	@Test // DATACMNS-1581

src/test/java/org/springframework/data/querydsl/QPageRequestUnitTests.java

@@ -23,7 +23,10 @@ import org.springframework.data.domain.AbstractPageRequest;
 import org.springframework.data.domain.AbstractPageRequestUnitTests;
 
 /**
+ * Unit tests for {@link QPageRequest}.
+ *
  * @author Thomas Darimont
+ * @author Mark Paluch
  */
 public class QPageRequestUnitTests extends AbstractPageRequestUnitTests {
 
@@ -49,7 +52,7 @@ public class QPageRequestUnitTests extends AbstractPageRequestUnitTests {
 	void constructsQPageRequestWithQSort() {
 
 		QUser user = QUser.user;
-		QPageRequest pageRequest = QPageRequest.of(0, 10, QSort.by(user.firstname.asc()));
+		QPageRequest pageRequest = QPageRequest.ofSize(10).withSort(QSort.by(user.firstname.asc()));
 
 		assertThat(pageRequest.getSort()).isEqualTo(QSort.by(user.firstname.asc()));
 	}