issue #146: Add ArangoCollection.exists()

Author: mpv1989

ChangeLog

@@ -1,3 +1,7 @@
+v4.2.5 (2017-xx-xx)
+---------------------------
+* issue #146: added ArangoCollection.exists()
+
 v4.2.4 (2017-09-04)
 ---------------------------
 * fixed ArangoDatabase.transaction(): ignore null result

src/main/java/com/arangodb/ArangoCollection.java

@@ -776,6 +776,23 @@ public Collection<IndexEntity> getIndexes() throws ArangoDBException {
 		return executor.execute(getIndexesRequest(), getIndexesResponseDeserializer());
 	}
 
+	/**
+	 * Checks whether the collection exists
+	 * 
+	 * @return true if the collection exists, otherwise false
+	 */
+	public boolean exists() {
+		boolean exists = false;
+		final Collection<CollectionEntity> collections = db().getCollections();
+		for (final CollectionEntity collection : collections) {
+			if (collection.getName().equals(name())) {
+				exists = true;
+				break;
+			}
+		}
+		return exists;
+	}
+
 	/**
 	 * Removes all documents from the collection, but leaves the indexes intact
 	 * 

src/test/java/com/arangodb/ArangoCollectionTest.java

@@ -954,6 +954,12 @@ public void getEdgeIndex() {
 		}
 	}
 
+	@Test
+	public void exists() {
+		assertThat(db.collection(COLLECTION_NAME).exists(), is(true));
+		assertThat(db.collection(COLLECTION_NAME + "no").exists(), is(false));
+	}
+
 	@Test
 	public void truncate() {
 		final BaseDocument doc = new BaseDocument();