1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.shardingsphere.sqlfederation.optimizer.metadata.schema.table; 19 20 import org.apache.calcite.linq4j.Enumerator; 21 22 /** 23 * Empty row enumerator. 24 */ 25 public final class EmptyRowEnumerator implements Enumerator<Object> { 26 27 @Override 28 public Object current() { 29 return new Object(); 30 } 31 32 @Override 33 public boolean moveNext() { 34 return false; 35 } 36 37 @Override 38 public void reset() { 39 } 40 41 @Override 42 public void close() { 43 } 44 }