added function createPersistentIndex() (issue #48)

Author: a-brandt

Diff for: src/main/java/com/arangodb/ArangoDriver.java

@@ -1491,6 +1491,32 @@ public IndexEntity createSkipListIndex(
 			fields);
 	}
 
+	/**
+	 * It is possible to define a persistent index on one or more attributes (or
+	 * paths) of documents. The index is then used in queries to locate
+	 * documents within a given range. If the index is declared unique, then no
+	 * two documents are allowed to have the same set of attribute values.
+	 *
+	 * @param collectionName
+	 *            The collection name.
+	 * @param unique
+	 *            if set to true the index will be a unique index
+	 * @param sparse
+	 *            if set to true the index will be sparse
+	 * @param fields
+	 *            the fields (document attributes) the index is created on
+	 * @return IndexEntity
+	 * @throws ArangoException
+	 */
+	public IndexEntity createPersistentIndex(
+		final String collectionName,
+		final boolean unique,
+		final boolean sparse,
+		final String... fields) throws ArangoException {
+		return indexDriver.createIndex(getDefaultDatabase(), collectionName, IndexType.PERSISTENT, unique, sparse,
+			fields);
+	}
+
 	/**
 	 * This method creates a full text index for a collection.
 	 *

Diff for: src/test/java/com/arangodb/ArangoDriverIndexTest.java

@@ -286,6 +286,22 @@ public void test_create_persistent_index() throws ArangoException {
 
 	}
 
+	@Test
+	public void test_create_persistent_index2() throws ArangoException {
+
+		final IndexEntity entity = driver.createPersistentIndex(collectionName, true, false, "a", "b", "c", "d", "e",
+			"f", "g");
+
+		assertThat(entity, is(notNullValue()));
+		assertThat(entity.getCode(), is(201));
+		assertThat(entity.isError(), is(false));
+		assertThat(entity.isNewlyCreated(), is(true));
+		assertThat(entity.isGeoJson(), is(false));
+		assertThat(entity.getId(), is(notNullValue()));
+		assertThat(entity.getType(), is(IndexType.PERSISTENT));
+
+	}
+
 	@Test
 	public void test_delete_index() throws ArangoException {