| /** |
| * 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.naming; |
| |
| /** |
| * A {@link ColumnNamingStrategy} that switches between two other |
| * {@link ColumnNamingStrategy} delegates depending on the availability of a |
| * intrinsic column name. |
| */ |
| public class DelegatingIntrinsicSwitchColumnNamingStrategy implements ColumnNamingStrategy { |
| |
| private static final long serialVersionUID = 1L; |
| private final ColumnNamingStrategy intrinsicStrategy; |
| private final ColumnNamingStrategy nonIntrinsicStrategy; |
| |
| public DelegatingIntrinsicSwitchColumnNamingStrategy(ColumnNamingStrategy intrinsicStrategy, |
| ColumnNamingStrategy nonIntrinsicStrategy) { |
| this.intrinsicStrategy = intrinsicStrategy; |
| this.nonIntrinsicStrategy = nonIntrinsicStrategy; |
| } |
| |
| @Override |
| public ColumnNamingSession startColumnNamingSession() { |
| final ColumnNamingSession intrinsicSession = intrinsicStrategy.startColumnNamingSession(); |
| final ColumnNamingSession nonIntrinsicSession = nonIntrinsicStrategy.startColumnNamingSession(); |
| return new ColumnNamingSession() { |
| |
| @Override |
| public String getNextColumnName(ColumnNamingContext ctx) { |
| final String intrinsicColumnName = ctx.getIntrinsicColumnName(); |
| if (intrinsicColumnName == null || intrinsicColumnName.isEmpty()) { |
| return nonIntrinsicSession.getNextColumnName(ctx); |
| } |
| return intrinsicSession.getNextColumnName(ctx); |
| } |
| |
| @Override |
| public void close() { |
| intrinsicSession.close(); |
| nonIntrinsicSession.close(); |
| } |
| }; |
| } |
| } |