001/* 002 * (C) Copyright 2020 Nuxeo (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Kevin Leturc <kleturc@nuxeo.com> 018 */ 019 020package org.nuxeo.ecm.core.scroll; 021 022import java.util.List; 023import java.util.Map; 024import java.util.NoSuchElementException; 025 026import org.nuxeo.ecm.core.api.scroll.Scroll; 027import org.nuxeo.ecm.core.api.scroll.ScrollRequest; 028 029/** 030 * Executes the scroll on an empty result set, useful for external scrollers. 031 * 032 * @since 11.3 033 */ 034public class EmptyScroll implements Scroll { 035 036 @Override 037 public void init(ScrollRequest request, Map<String, String> options) { 038 // nothing 039 } 040 041 @Override 042 public void close() { 043 // nothing 044 } 045 046 @Override 047 public boolean hasNext() { 048 return false; 049 } 050 051 @Override 052 public List<String> next() { 053 throw new NoSuchElementException(); 054 } 055}