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// Copyright (C) 2021 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.gerrit.server.query.change;
import static com.google.gerrit.server.query.change.EqualsLabelPredicates.type;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.LabelType;
import com.google.gerrit.entities.LabelValue;
import com.google.gerrit.index.query.PostFilterPredicate;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.server.index.change.ChangeField;
import com.google.gerrit.server.project.ProjectState;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
public class MagicLabelPredicates {
public static class PostFilterMagicLabelPredicate extends PostFilterPredicate<ChangeData> {
private static class PostFilterMatcher extends Matcher {
public PostFilterMatcher(
LabelPredicate.Args args, MagicLabelVote magicLabelVote, @Nullable Integer count) {
super(args, magicLabelVote, count);
}
@Override
protected Predicate<ChangeData> numericPredicate(String label, short value) {
return new EqualsLabelPredicates.PostFilterEqualsLabelPredicate(args, label, value, count);
}
}
private final PostFilterMatcher matcher;
public PostFilterMagicLabelPredicate(
LabelPredicate.Args args, MagicLabelVote magicLabelVote, @Nullable Integer count) {
super(
ChangeQueryBuilder.FIELD_LABEL,
ChangeField.formatLabel(magicLabelVote.label(), magicLabelVote.value().name(), count));
this.matcher = new PostFilterMatcher(args, magicLabelVote, count);
}
@Override
public boolean match(ChangeData changeData) {
return matcher.match(changeData);
}
@Override
public int getCost() {
return 2;
}
}
public static class IndexMagicLabelPredicate extends ChangeIndexPredicate {
private static class IndexMatcher extends Matcher {
public IndexMatcher(
LabelPredicate.Args args,
MagicLabelVote magicLabelVote,
Account.Id account,
@Nullable Integer count) {
super(args, magicLabelVote, account, count);
}
@Override
protected Predicate<ChangeData> numericPredicate(String label, short value) {
return new EqualsLabelPredicates.IndexEqualsLabelPredicate(
args, label, value, account, count);
}
}
private final Matcher matcher;
public IndexMagicLabelPredicate(
LabelPredicate.Args args, MagicLabelVote magicLabelVote, @Nullable Integer count) {
this(args, magicLabelVote, null, count);
}
public IndexMagicLabelPredicate(
LabelPredicate.Args args,
MagicLabelVote magicLabelVote,
Account.Id account,
@Nullable Integer count) {
super(
ChangeField.LABEL,
ChangeField.formatLabel(
magicLabelVote.label(), magicLabelVote.value().name(), account, count));
this.matcher = new IndexMatcher(args, magicLabelVote, account, count);
}
@Override
public boolean match(ChangeData changeData) {
return matcher.match(changeData);
}
}
private abstract static class Matcher {
protected final LabelPredicate.Args args;
protected final MagicLabelVote magicLabelVote;
protected final Account.Id account;
@Nullable protected final Integer count;
public Matcher(
LabelPredicate.Args args, MagicLabelVote magicLabelVote, @Nullable Integer count) {
this(args, magicLabelVote, null, count);
}
public Matcher(
LabelPredicate.Args args,
MagicLabelVote magicLabelVote,
Account.Id account,
@Nullable Integer count) {
this.account = account;
this.args = args;
this.magicLabelVote = magicLabelVote;
this.count = count;
}
public boolean match(ChangeData cd) {
Change change = cd.change();
if (change == null) {
return false; // The change has disappeared.
}
Optional<ProjectState> project = args.projectCache.get(change.getDest().project());
if (!project.isPresent()) {
return false; // The project has disappeared.
}
LabelType labelType = type(project.get().getLabelTypes(), magicLabelVote.label());
if (labelType == null) {
return false; // Label is not defined by this project.
}
switch (magicLabelVote.value()) {
case ANY:
return matchAny(cd, labelType);
case MIN:
return matchNumeric(cd, magicLabelVote.label(), labelType.getMin().getValue());
case MAX:
return matchNumeric(cd, magicLabelVote.label(), labelType.getMax().getValue());
}
throw new IllegalStateException("Unsupported magic label value: " + magicLabelVote.value());
}
private boolean matchAny(ChangeData changeData, LabelType labelType) {
List<Predicate<ChangeData>> predicates = new ArrayList<>();
for (LabelValue labelValue : labelType.getValues()) {
if (labelValue.getValue() != 0) {
predicates.add(numericPredicate(labelType.getName(), labelValue.getValue()));
}
}
return Predicate.or(predicates).asMatchable().match(changeData);
}
private boolean matchNumeric(ChangeData changeData, String label, short value) {
return numericPredicate(label, value).asMatchable().match(changeData);
}
protected abstract Predicate<ChangeData> numericPredicate(String label, short value);
}
}
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