| /* |
| * 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.hugegraph.backend.page; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.hugegraph.backend.id.Id; |
| import org.apache.hugegraph.backend.page.IdHolder.FixedIdHolder; |
| import org.apache.hugegraph.backend.query.Query; |
| import org.apache.hugegraph.util.CollectionUtil; |
| import org.apache.hugegraph.util.InsertionOrderUtil; |
| |
| import com.google.common.collect.ImmutableSet; |
| |
| public class SortByCountIdHolderList extends IdHolderList { |
| |
| private static final long serialVersionUID = -7779357582250824558L; |
| |
| private final List<IdHolder> mergedHolders; |
| |
| public SortByCountIdHolderList(boolean paging) { |
| super(paging); |
| this.mergedHolders = new ArrayList<>(); |
| } |
| |
| @Override |
| public boolean add(IdHolder holder) { |
| if (this.paging()) { |
| return super.add(holder); |
| } |
| this.mergedHolders.add(holder); |
| |
| if (super.isEmpty()) { |
| Query parent = holder.query().originQuery(); |
| super.add(new SortByCountIdHolder(parent)); |
| } |
| SortByCountIdHolder sortHolder = (SortByCountIdHolder) this.get(0); |
| sortHolder.merge(holder); |
| return true; |
| } |
| |
| private class SortByCountIdHolder extends FixedIdHolder { |
| |
| private final Map<Id, Integer> ids; |
| |
| public SortByCountIdHolder(Query parent) { |
| super(new MergedQuery(parent), ImmutableSet.of()); |
| this.ids = InsertionOrderUtil.newMap(); |
| } |
| |
| public void merge(IdHolder holder) { |
| for (Id id : holder.all()) { |
| this.ids.compute(id, (k, v) -> v == null ? 1 : v + 1); |
| Query.checkForceCapacity(this.ids.size()); |
| } |
| } |
| |
| @Override |
| public boolean keepOrder() { |
| return true; |
| } |
| |
| @Override |
| public Set<Id> all() { |
| return CollectionUtil.sortByValue(this.ids, false).keySet(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("%s{merged:%s}", |
| this.getClass().getSimpleName(), this.query); |
| } |
| } |
| |
| private class MergedQuery extends Query { |
| |
| public MergedQuery(Query parent) { |
| super(parent.resultType(), parent); |
| } |
| |
| @Override |
| public String toString() { |
| return SortByCountIdHolderList.this.mergedHolders.toString(); |
| } |
| } |
| } |