xuefuz commented on a change in pull request #8007: [FLINK-11474][table] Add 
ReadableCatalog, ReadableWritableCatalog, and other …
URL: https://github.com/apache/flink/pull/8007#discussion_r273261874
 
 

 ##########
 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/catalog/GenericInMemoryCatalog.java
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 @@ -0,0 +1,263 @@
+/*
+ * 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.flink.table.catalog;
+
+import org.apache.flink.table.catalog.exceptions.DatabaseAlreadyExistException;
+import org.apache.flink.table.catalog.exceptions.DatabaseNotEmptyException;
+import org.apache.flink.table.catalog.exceptions.DatabaseNotExistException;
+import org.apache.flink.table.catalog.exceptions.TableAlreadyExistException;
+import org.apache.flink.table.catalog.exceptions.TableNotExistException;
+import org.apache.flink.util.Preconditions;
+import org.apache.flink.util.StringUtils;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import static org.apache.flink.util.Preconditions.checkArgument;
+
+/**
+ * A generic catalog implementation that holds all meta objects in memory.
+ */
+public class GenericInMemoryCatalog implements ReadableWritableCatalog {
+
+       public static final String DEFAULT_DB = "default";
+
+       private String defaultDatabaseName = DEFAULT_DB;
+
+       private final String catalogName;
+       private final Map<String, CatalogDatabase> databases;
+       private final Map<ObjectPath, CommonTable> tables;
+
+       public GenericInMemoryCatalog(String name) {
+               
Preconditions.checkArgument(!StringUtils.isNullOrWhitespaceOnly(name), "name 
cannot be null or empty");
+
+               this.catalogName = name;
+               this.databases = new LinkedHashMap<>();
+               this.databases.put(DEFAULT_DB, new GenericCatalogDatabase());
+               this.tables = new LinkedHashMap<>();
+       }
+
+       @Override
+       public String getDefaultDatabaseName() {
+               return defaultDatabaseName;
+       }
+
+       @Override
+       public void setDefaultDatabaseName(String databaseName) {
+               
checkArgument(!StringUtils.isNullOrWhitespaceOnly(databaseName));
+
+               defaultDatabaseName = databaseName;
+       }
+
+       @Override
+       public void open() {
+
+       }
+
+       @Override
+       public void close() {
+
+       }
+
+       // ------ databases ------
+
+       @Override
+       public void createDatabase(String databaseName, CatalogDatabase db, 
boolean ignoreIfExists)
+               throws DatabaseAlreadyExistException {
+               if (databaseExists(databaseName)) {
+                       if (!ignoreIfExists) {
+                               throw new 
DatabaseAlreadyExistException(catalogName, databaseName);
+                       }
+               } else {
+                       databases.put(databaseName, db.copy());
+               }
+       }
+
+       @Override
+       public void dropDatabase(String dbName, boolean ignoreIfNotExists) 
throws DatabaseNotExistException {
+               if (databases.containsKey(dbName)) {
+
+                       // Make sure the database is empty
+                       if (isDatabaseEmpty(dbName)) {
+                               databases.remove(dbName);
+                       } else {
+                               throw new 
DatabaseNotEmptyException(catalogName, dbName);
+                       }
+               } else if (!ignoreIfNotExists) {
+                       throw new DatabaseNotExistException(catalogName, 
dbName);
+               }
+       }
+
+       private boolean isDatabaseEmpty(String databaseName) {
+               return tables.keySet().stream().noneMatch(op -> 
op.getDatabaseName().equals(databaseName));
+               // TODO: also check function when function is added.
+       }
+
+       @Override
+       public void alterDatabase(String databaseName, CatalogDatabase 
newDatabase, boolean ignoreIfNotExists)
+               throws DatabaseNotExistException {
+               if (databaseExists(databaseName)) {
+                       databases.put(databaseName, newDatabase.copy());
+               } else if (!ignoreIfNotExists) {
+                       throw new DatabaseNotExistException(catalogName, 
databaseName);
+               }
+       }
+
+       @Override
+       public List<String> listDatabases() {
+               return new ArrayList<>(databases.keySet());
+       }
+
+       @Override
+       public CatalogDatabase getDatabase(String databaseName) throws 
DatabaseNotExistException {
+               if (!databaseExists(databaseName)) {
+                       throw new DatabaseNotExistException(catalogName, 
databaseName);
+               } else {
+                       return databases.get(databaseName).copy();
+               }
+       }
+
+       @Override
+       public boolean databaseExists(String dbName) {
+               return databases.containsKey(dbName);
+       }
+
+       // ------ tables ------
+
+       @Override
+       public void createTable(ObjectPath tablePath, CommonTable table, 
boolean ignoreIfExists)
+               throws TableAlreadyExistException, DatabaseNotExistException {
+
+               if (!databaseExists(tablePath.getDatabaseName())) {
+                       throw new DatabaseNotExistException(catalogName, 
tablePath.getDatabaseName());
+               }
+
+               if (tableExists(tablePath)) {
+                       if (!ignoreIfExists) {
+                               throw new 
TableAlreadyExistException(catalogName, tablePath);
+                       }
+               } else {
+                       tables.put(tablePath, table.copy());
+               }
+       }
+
+       @Override
+       public void alterTable(ObjectPath tablePath, CommonTable newTable, 
boolean ignoreIfNotExists)
+               throws TableNotExistException {
+               if (tableExists(tablePath)) {
+                       tables.put(tablePath, newTable.copy());
+               } else if (!ignoreIfNotExists) {
+                       throw new TableNotExistException(catalogName, 
tablePath);
+               }
+       }
+
+       @Override
+       public void renameTable(ObjectPath tablePath, String newTableName, 
boolean ignoreIfNotExists)
+               throws TableNotExistException, TableAlreadyExistException {
+
+               if (tableExists(tablePath)) {
+                       ObjectPath newPath = new 
ObjectPath(tablePath.getDatabaseName(), newTableName);
+
+                       if (tableExists(newPath)) {
+                               throw new 
TableAlreadyExistException(catalogName, newPath);
+                       } else {
+                               tables.put(newPath, tables.remove(tablePath));
+                       }
+               } else if (!ignoreIfNotExists) {
+                       throw new TableNotExistException(catalogName, 
tablePath);
+               }
+       }
+
+       // ------ tables and views ------
+
+       @Override
+       public void dropTable(ObjectPath tablePath, boolean ignoreIfNotExists) 
throws TableNotExistException {
+               if (tableExists(tablePath)) {
+                       tables.remove(tablePath);
+               } else if (!ignoreIfNotExists) {
+                       throw new TableNotExistException(catalogName, 
tablePath);
+               }
+       }
+
+       @Override
+       public List<String> listTables(String dbName) throws 
DatabaseNotExistException {
+               checkArgument(!StringUtils.isNullOrWhitespaceOnly(dbName), 
"dbName cannot be null or empty");
+
+               if (!databaseExists(dbName)) {
+                       throw new DatabaseNotExistException(catalogName, 
dbName);
+               }
+
+               return tables.keySet().stream()
+                       .filter(k -> k.getDatabaseName().equals(dbName)).map(k 
-> k.getObjectName())
+                       .collect(Collectors.toList());
+       }
+
+       @Override
+       public CommonTable getTable(ObjectPath tableName) throws 
TableNotExistException {
+
+               if (!tableExists(tableName)) {
+                       throw new TableNotExistException(catalogName, 
tableName);
+               } else {
+                       return tables.get(tableName).copy();
+               }
+       }
+
+       @Override
+       public boolean tableExists(ObjectPath tablePath) {
+               return databaseExists(tablePath.getDatabaseName()) && 
tables.containsKey(tablePath);
+       }
+
+       // ------ views ------
+
+       @Override
+       public List<String> listViews(String databaseName) throws 
DatabaseNotExistException {
+               
checkArgument(!StringUtils.isNullOrWhitespaceOnly(databaseName), "dbName cannot 
be null or empty");
+
+               if (!databaseExists(databaseName)) {
+                       throw new DatabaseNotExistException(catalogName, 
databaseName);
+               }
+
+               return tables.keySet().stream()
+                       .filter(k -> k.getDatabaseName().equals(databaseName))
+                       .filter(k -> (tables.get(k) instanceof 
CatalogView)).map(k -> k.getObjectName())
+                       .collect(Collectors.toList());
+       }
+
+       @Override
+       public void createView(ObjectPath viewPath, CatalogView view, boolean 
ignoreIfExists)
+               throws TableAlreadyExistException, DatabaseNotExistException {
+               createTable(viewPath, view, ignoreIfExists);
+       }
+
+       @Override
+       public void alterView(ObjectPath viewPath, CatalogView newView, boolean 
ignoreIfNotExists)
+               throws TableNotExistException {
+               alterTable(viewPath, newView, ignoreIfNotExists);
+       }
+
+       @Override
+       public void renameView(ObjectPath viewPath, String newViewName, boolean 
ignoreIfNotExists)
 
 Review comment:
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