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Correct pagination

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This commit is contained in:
René Pfeuffer
2018-06-06 08:44:32 +02:00
parent 7bc2c1479a
commit 2673756f8b
5 changed files with 78 additions and 16 deletions
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36
scm-core/src/main/java/sonia/scm/Manager.java
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@@ -35,8 +35,9 @@ package sonia.scm;
//~--- JDK imports ------------------------------------------------------------
import java.io.IOException;
import sonia.scm.util.Util;
import java.io.IOException;
import java.util.Collection;
import java.util.Comparator;
@@ -61,7 +62,7 @@ public interface Manager<T extends ModelObject, E extends Exception>
* @throws E
* @throws IOException
*/
public void refresh(T object) throws E, IOException;
void refresh(T object) throws E, IOException;
//~--- get methods ----------------------------------------------------------
@@ -73,7 +74,7 @@ public interface Manager<T extends ModelObject, E extends Exception>
*
* @return object with the given id
*/
public T get(String id);
T get(String id);
/**
* Returns a {@link java.util.Collection} of all objects in the store.
@@ -81,7 +82,7 @@ public interface Manager<T extends ModelObject, E extends Exception>
*
* @return all object in the store
*/
public Collection<T> getAll();
Collection<T> getAll();
/**
* Returns all object of the store sorted by the given {@link java.util.Comparator}
@@ -91,7 +92,7 @@ public interface Manager<T extends ModelObject, E extends Exception>
* @since 1.4
* @return all object of the store sorted by the given {@link java.util.Comparator}
*/
public Collection<T> getAll(Comparator<T> comparator);
Collection<T> getAll(Comparator<T> comparator);
/**
* Returns objects from the store which are starts at the given start
@@ -105,7 +106,7 @@ public interface Manager<T extends ModelObject, E extends Exception>
* @return objects from the store which are starts at the given
* start parameter
*/
public Collection<T> getAll(int start, int limit);
Collection<T> getAll(int start, int limit);
/**
* Returns objects from the store which are starts at the given start
@@ -121,5 +122,26 @@ public interface Manager<T extends ModelObject, E extends Exception>
* @return objects from the store which are starts at the given
* start parameter
*/
public Collection<T> getAll(Comparator<T> comparator, int start, int limit);
Collection<T> getAll(Comparator<T> comparator, int start, int limit);
/**
* Returns objects from the store divided into pages with the given page
* size for the given page number (zero based) and sorted by the given
* {@link java.util.Comparator}.
*
* @param comparator to sort the returned objects
* @param pageNumber the number of the page to be returned (zero based)
* @param pageSize the size of the pages
*
* @since 2.0
* @return {@link PageResult} with the objects from the store for the requested
* page. If the requested page number exceeds the existing pages, an
* empty page result is returned.
*/
default PageResult<T> getPage(Comparator<T> comparator, int pageNumber, int pageSize) {
Collection<T> entities = getAll(comparator, pageNumber * pageSize, pageSize + 1);
boolean hasMore = entities.size() > pageSize;
return new PageResult<>(Util.createSubCollection(entities, 0, pageSize), hasMore);
}
}

23
scm-core/src/main/java/sonia/scm/PageResult.java Normal file
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@@ -0,0 +1,23 @@
package sonia.scm;
import java.util.Collection;
import java.util.Collections;
public class PageResult<T extends ModelObject> {
private final Collection<T> entities;
private final boolean hasMore;
public PageResult(Collection<T> entities, boolean hasMore) {
this.entities = entities;
this.hasMore = hasMore;
}
public Collection<T> getEntities() {
return Collections.unmodifiableCollection(entities);
}
public boolean hasMore() {
return hasMore;
}
}