Github user kaspersorensen commented on a diff in the pull request:
https://github.com/apache/metamodel/pull/140#discussion_r97700078
--- Diff:
dynamodb/src/main/java/org/apache/metamodel/dynamodb/DynamoDbDataContext.java
---
@@ -0,0 +1,320 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.metamodel.dynamodb;
+
+import java.io.Closeable;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.metamodel.MetaModelException;
+import org.apache.metamodel.QueryPostprocessDataContext;
+import org.apache.metamodel.UpdateScript;
+import org.apache.metamodel.UpdateableDataContext;
+import org.apache.metamodel.data.DataSet;
+import org.apache.metamodel.data.DefaultRow;
+import org.apache.metamodel.data.Row;
+import org.apache.metamodel.data.SimpleDataSetHeader;
+import org.apache.metamodel.query.FilterItem;
+import org.apache.metamodel.query.SelectItem;
+import org.apache.metamodel.schema.Column;
+import org.apache.metamodel.schema.ColumnType;
+import org.apache.metamodel.schema.MutableColumn;
+import org.apache.metamodel.schema.MutableSchema;
+import org.apache.metamodel.schema.MutableTable;
+import org.apache.metamodel.schema.Schema;
+import org.apache.metamodel.schema.Table;
+import org.apache.metamodel.util.SimpleTableDef;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
+import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
+import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
+import com.amazonaws.services.dynamodbv2.model.AttributeValue;
+import com.amazonaws.services.dynamodbv2.model.DescribeTableResult;
+import com.amazonaws.services.dynamodbv2.model.GetItemRequest;
+import com.amazonaws.services.dynamodbv2.model.GetItemResult;
+import
com.amazonaws.services.dynamodbv2.model.GlobalSecondaryIndexDescription;
+import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
+import com.amazonaws.services.dynamodbv2.model.ListTablesResult;
+import
com.amazonaws.services.dynamodbv2.model.LocalSecondaryIndexDescription;
+import com.amazonaws.services.dynamodbv2.model.ScanRequest;
+import com.amazonaws.services.dynamodbv2.model.ScanResult;
+import com.amazonaws.services.dynamodbv2.model.TableDescription;
+
+/**
+ * DataContext implementation for Amazon DynamoDB.
+ */
+public class DynamoDbDataContext extends QueryPostprocessDataContext
implements UpdateableDataContext, Closeable {
+
+ /**
+ * System property key used for getting the read throughput capacity
when
+ * creating new tables. Defaults to 5.
+ */
+ public static final String SYSTEM_PROPERTY_THROUGHPUT_READ_CAPACITY =
"metamodel.dynamodb.throughput.capacity.read";
+
+ /**
+ * System property key used for getting the write throughput capacity
when
+ * creating new tables. Defaults to 5.
+ */
+ public static final String SYSTEM_PROPERTY_THROUGHPUT_WRITE_CAPACITY =
"metamodel.dynamodb.throughput.capacity.write";
+
+ private static final Logger logger =
LoggerFactory.getLogger(DynamoDbDataContext.class);
+
+ /**
+ * The artificial schema name used by this DataContext.
+ */
+ public static final String SCHEMA_NAME = "public";
+
+ private final AmazonDynamoDB _dynamoDb;
+ private final boolean _shutdownOnClose;
+ private final SimpleTableDef[] _tableDefs;
+
+ public DynamoDbDataContext() {
+ this(AmazonDynamoDBClientBuilder.defaultClient(), null, true);
+ }
+
+ public DynamoDbDataContext(SimpleTableDef[] tableDefs) {
+ this(AmazonDynamoDBClientBuilder.defaultClient(), tableDefs, true);
+ }
+
+ public DynamoDbDataContext(AmazonDynamoDB client) {
+ this(client, null, false);
+ }
+
+ public DynamoDbDataContext(AmazonDynamoDB client, SimpleTableDef[]
tableDefs) {
+ this(client, tableDefs, false);
+ }
+
+ private DynamoDbDataContext(AmazonDynamoDB client, SimpleTableDef[]
tableDefs, boolean shutdownOnClose) {
+ _dynamoDb = client;
+ _tableDefs = (tableDefs == null ? new SimpleTableDef[0] :
tableDefs);
+ _shutdownOnClose = shutdownOnClose;
+ }
+
+ public AmazonDynamoDB getDynamoDb() {
+ return _dynamoDb;
+ }
+
+ @Override
+ public void close() {
+ if (_shutdownOnClose) {
+ _dynamoDb.shutdown();
+ }
+ }
+
+ @Override
+ protected Schema getMainSchema() throws MetaModelException {
+ final Map<String, SimpleTableDef> tableDefs = new HashMap<>();
+ for (SimpleTableDef tableDef : _tableDefs) {
+ tableDefs.put(tableDef.getName(), tableDef);
+ }
+
+ final MutableSchema schema = new
MutableSchema(getMainSchemaName());
+ final ListTablesResult tables = _dynamoDb.listTables();
+ final List<String> tableNames = tables.getTableNames();
+ for (String tableName : tableNames) {
+ final MutableTable table = new MutableTable(tableName, schema);
+ schema.addTable(table);
+
+ final DescribeTableResult descripeTableResult =
_dynamoDb.describeTable(tableName);
+ final TableDescription tableDescription =
descripeTableResult.getTable();
+
+ // add primary keys
+ addColumnFromKeySchema("Primary index",
tableDescription.getKeySchema(), table, true);
+
+ // add attributes from global and local indices
+ final List<GlobalSecondaryIndexDescription>
globalSecondaryIndexes = tableDescription
+ .getGlobalSecondaryIndexes();
+ if (globalSecondaryIndexes != null) {
+ for (GlobalSecondaryIndexDescription globalSecondaryIndex
: globalSecondaryIndexes) {
+
addColumnFromKeySchema(globalSecondaryIndex.getIndexName(),
globalSecondaryIndex.getKeySchema(),
--- End diff --
Unfortunately the GlobalSecondaryIndexDescription and
LocalSecondaryIndexDescription classes don't share a common super-class, so I'm
not sure if it can be made more general.
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