chore: add jarkata data

jakarta-data/src/main/java/com/qwlabs/jakarta/data/PageRequests.java

@@ -0,0 +1,22 @@
+package com.qwlabs.jakarta.data;
+
+import com.google.common.primitives.Longs;
+import jakarta.data.page.PageRequest;
+
+import java.util.Optional;
+
+public interface PageRequests {
+
+    static PageRequest of(int first) {
+        return of(null, first);
+    }
+
+    static PageRequest of(String after, int first) {
+        if (first <= 0) {
+            throw new IllegalArgumentException("first can not be less than 1");
+        }
+        var startAt = Optional.ofNullable(after).map(Longs::tryParse).orElse(0L);
+        var pageNumber = (startAt + first) / first;
+        return PageRequest.ofPage(pageNumber, first, true);
+    }
+}

jakarta-data/src/test/java/com/qwlabs/jakarta/data/PageRequestsTest.java

@@ -0,0 +1,30 @@
+package com.qwlabs.jakarta.data;
+
+import jakarta.data.page.PageRequest;
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+class PageRequestsTest {
+    @Test
+    void should_of() {
+        checkRequest(null, 2, 1L);
+        checkRequest("0", 2, 1L);
+        checkRequest("1", 2, 1L);
+        checkRequest("1", 3, 1L);
+        checkRequest("1", 10, 1L);
+        checkRequest("2", 1, 3L);
+        checkRequest("2", 2, 2L);
+        checkRequest("2", 3, 1L);
+        checkRequest("2", 4, 1L);
+    }
+
+    void checkRequest(String after, Integer first, long page) {
+        var pageRequest = PageRequests.of(after, first);
+        assertThat(pageRequest.page(), is(page));
+        assertThat(pageRequest.size(), is(first));
+        assertThat(pageRequest.requestTotal(), is(true));
+        assertThat(pageRequest.mode(), is(PageRequest.Mode.OFFSET));
+    }
+}