001/* 002 * (C) Copyright 2014-2017 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 * bdelbosc 018 */ 019package org.nuxeo.ecm.core.api; 020 021import java.util.Collections; 022import java.util.List; 023 024/** 025 * @since 8.4 026 */ 027public class ScrollResultImpl<T> implements ScrollResult<T> { 028 029 protected static final ScrollResult<?> EMPTY_RESULT = new ScrollResultImpl<>("empty", Collections.emptyList()); 030 031 protected final String scrollId; 032 033 protected final List<T> results; 034 035 @SuppressWarnings("unchecked") 036 public static <O> ScrollResult<O> emptyResult() { 037 return (ScrollResult<O>) EMPTY_RESULT; 038 } 039 040 public ScrollResultImpl(String scrollId, List<T> results) { 041 this.scrollId = scrollId; 042 this.results = Collections.unmodifiableList(results); 043 } 044 045 @Override 046 public String getScrollId() { 047 return scrollId; 048 } 049 050 @Override 051 public boolean hasResults() { 052 return results != null && !results.isEmpty(); 053 } 054 055 @Override 056 @SuppressWarnings("unchecked") 057 public List<T> getResults() { 058 return results; 059 } 060 061}