| // Copyright (C) 2016 The Android Open Source Project |
| // |
| // Licensed 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 com.google.reviewit.app; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Predicate; |
| import com.google.common.collect.Collections2; |
| import com.google.common.collect.ImmutableList; |
| import com.google.gerrit.extensions.client.ListChangesOption; |
| import com.google.gerrit.extensions.common.ChangeInfo; |
| import com.google.gerrit.extensions.restapi.RestApiException; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| public class QueryHandler { |
| /** |
| * Number of changes that should be fetched at once from the server. |
| */ |
| private static final int LIMIT_QUERY = 25; |
| |
| private final Gerrit gerrit; |
| |
| private final LinkedList<Change> result = new LinkedList<>(); |
| |
| private QueryConfig config; |
| |
| /** |
| * Number of changes which should be skipped when querying the next changes |
| * from the server. |
| */ |
| private int start = 0; |
| |
| private int page = 0; |
| |
| /** |
| * Whether there are more changes at the server. |
| */ |
| private boolean more = true; |
| |
| private Change currentChange; |
| |
| QueryHandler(ConfigManager cfgManager, Gerrit gerrit) { |
| this.gerrit = gerrit; |
| this.config = cfgManager.getQueryConfig(); |
| |
| cfgManager.addUpdateListener(new ConfigManager.OnUpdate() { |
| @Override |
| public void onUpdate(QueryConfig cfg) { |
| config = cfg; |
| reset(); |
| } |
| }); |
| } |
| |
| public List<Change> next() throws RestApiException { |
| query(); |
| List<Change> nextChanges = |
| result.subList(page * LIMIT_QUERY, |
| Math.min((page + 1) * LIMIT_QUERY, result.size())); |
| page++; |
| return nextChanges; |
| } |
| |
| public boolean hasNext() { |
| return more; |
| } |
| |
| public List<Change> getLoadedChanges() { |
| return ImmutableList.copyOf(result); |
| } |
| |
| private void query() throws RestApiException { |
| result.addAll(Collections2.transform(Collections2.filter( |
| gerrit.api() |
| .changes() |
| .query(config.encodedQuery()) |
| .withOption(ListChangesOption.ALL_FILES) |
| .withOption(ListChangesOption.CURRENT_COMMIT) |
| .withOption(ListChangesOption.CURRENT_REVISION) |
| .withOption(ListChangesOption.DETAILED_ACCOUNTS) |
| .withOption(ListChangesOption.DETAILED_LABELS) |
| .withLimit(LIMIT_QUERY) |
| .withStart(start) |
| .get(), new Predicate<ChangeInfo>() { |
| @Override |
| public boolean apply(ChangeInfo changeInfo) { |
| // filter out changes with no revisions |
| return changeInfo.revisions != null; |
| } |
| }), new Function<ChangeInfo, Change>() { |
| @Override |
| public Change apply(ChangeInfo changeInfo) { |
| return new Change(gerrit.api(), changeInfo); |
| } |
| })); |
| start += LIMIT_QUERY; |
| more = !result.isEmpty() && (result.getLast().info._moreChanges != null |
| ? result.getLast().info._moreChanges |
| : false); |
| } |
| |
| public Change getCurrentChange() { |
| return currentChange; |
| } |
| |
| public void setCurrentChange(Change currentChange) { |
| this.currentChange = currentChange; |
| } |
| |
| public void reset() { |
| result.clear(); |
| start = 0; |
| more = true; |
| page = 0; |
| currentChange = null; |
| } |
| } |