| /** |
| * 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.schema; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import org.apache.metamodel.DataContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A composite schema, comprising tables from several {@link DataContext}s. |
| */ |
| public class CompositeSchema extends AbstractSchema { |
| |
| private static final long serialVersionUID = 1L; |
| |
| private static final Logger logger = LoggerFactory.getLogger(CompositeSchema.class); |
| |
| private final String name; |
| private final Collection<? extends Schema> delegates; |
| |
| public CompositeSchema(String name, Collection<? extends Schema> delegates) { |
| super(); |
| this.name = name; |
| this.delegates = delegates; |
| if (logger.isWarnEnabled()) { |
| Set<String> names = new HashSet<String>(); |
| for (Table table : getTables()) { |
| if (names.contains(table.getName())) { |
| logger.warn("Name-clash detected for Table {}.", table.getName()); |
| logger.warn("getTableByName(\"{}\") will return just the first table.", table.getName()); |
| } else { |
| names.add(table.getName()); |
| } |
| } |
| if (!names.isEmpty()) { |
| logger.warn("The following table names clashes in composite schema: " + names); |
| } |
| } |
| } |
| |
| @Override |
| public List<Relationship> getRelationships() { |
| return delegates.stream() |
| .flatMap(delegate -> delegate.getRelationships().stream()) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public List<Table> getTables() { |
| return delegates.stream() |
| .flatMap(delegate -> delegate.getTables().stream()) |
| .filter(table -> table.getType() != TableType.ALIAS) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public String getQuote() { |
| return null; |
| } |
| } |