Add utilities for Pageable to be used with Doma.

Author: making

doma-spring-boot-autoconfigure/pom.xml

@@ -32,6 +32,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-jdbc</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.data</groupId>
+            <artifactId>spring-data-commons</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-configuration-processor</artifactId>

doma-spring-boot-autoconfigure/src/main/java/org/seasar/doma/boot/Pageables.java

@@ -1,4 +1,39 @@
+/*
+ * Copyright (C) 2004-2016 the Seasar Foundation and the Others.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
 package org.seasar.doma.boot;
 
+import org.seasar.doma.jdbc.SelectOptions;
+import org.springframework.data.domain.Pageable;
+
+/**
+ * Converts Utilities for {@link Pageable} to be used with Doma.
+ *
+ * @author Toshiaki Maki
+ */
 public final class Pageables {
+	/**
+	 * Converts {@link Pageable} to {@link SelectOptions}
+	 *
+	 * @param pageable {@link Pageable} object to convert
+	 * @return {@link SelectOptions} object corresponds to the given {@link Pageable}
+	 * object.
+	 */
+	public static SelectOptions toSelectOptions(Pageable pageable) {
+		final int offset = pageable.getPageNumber() * pageable.getPageSize();
+		final int limit = pageable.getPageSize();
+		return SelectOptions.get().offset(offset).limit(limit);
+	}
 }

doma-spring-boot-autoconfigure/src/test/java/org/seasar/doma/boot/PageablesTest.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2004-2016 the Seasar Foundation and the Others.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+package org.seasar.doma.boot;
+
+import org.junit.Test;
+import org.seasar.doma.jdbc.SelectOptions;
+import org.seasar.doma.jdbc.SelectOptionsAccessor;
+import org.springframework.data.domain.PageRequest;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class PageablesTest {
+
+	@Test
+	public void testToSelectOptions() throws Exception {
+		SelectOptions options = Pageables.toSelectOptions(new PageRequest(0, 10));
+		assertThat(SelectOptionsAccessor.getOffset(options), is(0L));
+		assertThat(SelectOptionsAccessor.getLimit(options), is(10L));
+	}
+
+	@Test
+	public void testToSelectOptions2() throws Exception {
+		SelectOptions options = Pageables.toSelectOptions(new PageRequest(2, 10));
+		assertThat(SelectOptionsAccessor.getOffset(options), is(20L));
+		assertThat(SelectOptionsAccessor.getLimit(options), is(10L));
+	}
+
+	@Test
+	public void testToSelectOptions3() throws Exception {
+		SelectOptions options = Pageables.toSelectOptions(new PageRequest(2, 5));
+		assertThat(SelectOptionsAccessor.getOffset(options), is(10L));
+		assertThat(SelectOptionsAccessor.getLimit(options), is(5L));
+	}
+}