Github user tomatophantastico commented on a diff in the pull request:
https://github.com/apache/metamodel-membrane/pull/1#discussion_r130057536
--- Diff:
core/src/main/java/org/apache/metamodel/membrane/controllers/ColumnController.java
---
@@ -0,0 +1,86 @@
+/**
+ * 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.membrane.controllers;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.apache.metamodel.DataContext;
+import org.apache.metamodel.membrane.app.DataContextTraverser;
+import org.apache.metamodel.membrane.app.TenantContext;
+import org.apache.metamodel.membrane.app.TenantRegistry;
+import org.apache.metamodel.schema.Column;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping(value = {
"/{tenant}/{dataContext}/schemas/{schema}/tables/{table}/columns/{column}",
+ "/{tenant}/{dataContext}/s/{schema}/t/{table}/c/{column}" },
produces = MediaType.APPLICATION_JSON_VALUE)
+public class ColumnController {
+
+ private final TenantRegistry tenantRegistry;
+
+ @Autowired
+ public ColumnController(TenantRegistry tenantRegistry) {
+ this.tenantRegistry = tenantRegistry;
+ }
+
+ @RequestMapping(method = RequestMethod.GET)
+ @ResponseBody
+ public Map<String, Object> get(@PathVariable("tenant") String tenantId,
+ @PathVariable("dataContext") String dataSourceName,
@PathVariable("schema") String schemaId,
+ @PathVariable("table") String tableId, @PathVariable("column")
String columnId) {
+ final TenantContext tenantContext =
tenantRegistry.getTenantContext(tenantId);
+ final DataContext dataContext =
tenantContext.getDataSourceRegistry().openDataContext(dataSourceName);
+
+ final DataContextTraverser traverser = new
DataContextTraverser(dataContext);
+
+ final Column column = traverser.getColumn(schemaId, tableId,
columnId);
+
+ final String tenantName = tenantContext.getTenantName();
+ final String tableName = column.getTable().getName();
+ final String schemaName = column.getTable().getSchema().getName();
+
+ final Map<String, Object> metadata = new LinkedHashMap<>();
+ metadata.put("number", column.getColumnNumber());
+ metadata.put("size", column.getColumnSize());
+ metadata.put("nullable", column.isNullable());
+ metadata.put("primary-key", column.isPrimaryKey());
+ metadata.put("indexed", column.isIndexed());
+ metadata.put("column-type", column.getType() == null ? null :
column.getType().getName());
+ metadata.put("native-type", column.getNativeType());
+ metadata.put("remarks", column.getRemarks());
+
+ final Map<String, Object> map = new LinkedHashMap<>();
+ map.put("type", "column");
+ map.put("name", column.getName());
+ map.put("table", tableName);
+ map.put("schema", schemaName);
+ map.put("datasource", dataSourceName);
+ map.put("tenant", tenantName);
+ map.put("metadata", metadata);
+
+ return map;
--- End diff --
I do not think that creating maps with data is a good idea. Better use a
custom serializer.
It would be even better to refactor the original classes exposed here to
require less effort when deserializing.
If you want to do federation, you'll also want consume this endpoint, right?
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