add some more javadoc and unit tests

oshdb/src/main/java/org/heigit/ohsome/oshdb/OSHDBBoundable.java

@@ -1,5 +1,8 @@
 package org.heigit.ohsome.oshdb;
 
+/**
+ * Interface for spatially boundable objects, i.e. objects which have a bounding box.
+ */
 public interface OSHDBBoundable {
 
   long getMinLonLong();

oshdb/src/main/java/org/heigit/ohsome/oshdb/OSHDBTemporal.java

@@ -5,6 +5,9 @@
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 
+/**
+ * Interface for objects which are associated to a single timestamp.
+ */
 public interface OSHDBTemporal {
 
   long getEpochSecond();

oshdb/src/test/java/org/heigit/ohsome/oshdb/util/OSHDBBoundableTest.java

@@ -0,0 +1,50 @@
+package org.heigit.ohsome.oshdb.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.heigit.ohsome.oshdb.OSHDBBoundable;
+import org.heigit.ohsome.oshdb.OSHDBBoundingBox;
+import org.junit.Test;
+
+public class OSHDBBoundableTest {
+  private OSHDBBoundable point = new OSHDBBoundingBox(0L, 0L, 0L, 0L);
+  private OSHDBBoundable box = new OSHDBBoundingBox(-1L, -1L, 1L, 1L);
+
+  @Test
+  public void testPoint() {
+    assertTrue(point.isPoint());
+    assertFalse(box.isPoint());
+  }
+
+  @Test
+  public void testValid() {
+    assertTrue(point.isValid());
+    assertTrue(box.isValid());
+    OSHDBBoundable invalid = new OSHDBBoundingBox(1L, 1L, -1L, -1L);
+    assertFalse(invalid.isValid());
+  }
+
+  @Test
+  public void testCovered() {
+    assertTrue(point.coveredBy(box));
+    assertFalse(point.coveredBy(null));
+  }
+
+  @Test
+  public void testIntersects() {
+    assertTrue(point.intersects(box));
+    assertFalse(point.intersects(null));
+  }
+
+  @Test
+  public void testIntersection() {
+    OSHDBBoundable box2 = new OSHDBBoundingBox(0L, 0L, 2L, 2L);
+    OSHDBBoundable intersection = box2.intersection(box);
+    assertEquals(0, intersection.getMinLonLong());
+    assertEquals(0, intersection.getMinLatLong());
+    assertEquals(1, intersection.getMaxLonLong());
+    assertEquals(1, intersection.getMaxLatLong());
+  }
+}

oshdb/src/test/java/org/heigit/ohsome/oshdb/util/OSHDBTemporalTest.java

@@ -0,0 +1,21 @@
+package org.heigit.ohsome.oshdb.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.heigit.ohsome.oshdb.OSHDBTemporal;
+import org.heigit.ohsome.oshdb.OSHDBTimestamp;
+import org.junit.Test;
+
+public class OSHDBTemporalTest {
+  @Test
+  public void testBeforeAfter() {
+    OSHDBTemporal t1 = new OSHDBTimestamp(0);
+    OSHDBTemporal t2 = new OSHDBTimestamp(1);
+    assertTrue(t1.isBefore(t2));
+    assertTrue(t2.isAfter(t1));
+    assertEquals(0, OSHDBTemporal.compare(t1, t1));
+    assertTrue(OSHDBTemporal.compare(t1, t2) < 0);
+    assertTrue(OSHDBTemporal.compare(t2, t1) > 0);
+  }
+}