| /* |
| * 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.calcite.rel; |
| |
| import org.apache.calcite.util.mapping.IntPair; |
| |
| import java.util.List; |
| |
| /** |
| * Interface for a referential constraint, i.e., Foreign-Key - Unique-Key relationship, |
| * between two tables. |
| */ |
| public interface RelReferentialConstraint { |
| //~ Methods ---------------------------------------------------------------- |
| |
| /** Returns the number of columns in the keys. |
| * |
| * @deprecated Use {@code getColumnPairs().size()} */ |
| @Deprecated // to be removed before 2.0 |
| default int getNumColumns() { |
| return getColumnPairs().size(); |
| } |
| |
| /**The qualified name of the referencing table, e.g. DEPT. */ |
| List<String> getSourceQualifiedName(); |
| |
| /** The qualified name of the referenced table, e.g. EMP. */ |
| List<String> getTargetQualifiedName(); |
| |
| /** The (source, target) column ordinals. */ |
| List<IntPair> getColumnPairs(); |
| |
| } |