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// Copyright (C) 2010 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 com.google.gerrit.server.query.AndPredicate;
import com.google.gerrit.server.query.Predicate;
import com.google.gwtorm.client.OrmException;
import com.google.gwtorm.client.ResultSet;
import com.google.gwtorm.client.impl.ListResultSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class AndSource extends AndPredicate<ChangeData> implements ChangeDataSource {
private static final Comparator<Predicate<ChangeData>> CMP =
new Comparator<Predicate<ChangeData>>() {
@Override
public int compare(Predicate<ChangeData> a, Predicate<ChangeData> b) {
int ai = a instanceof ChangeDataSource ? 0 : 1;
int bi = b instanceof ChangeDataSource ? 0 : 1;
int cmp = ai - bi;
if (cmp == 0 //
&& a instanceof ChangeDataSource //
&& b instanceof ChangeDataSource) {
ai = ((ChangeDataSource) a).hasChange() ? 0 : 1;
bi = ((ChangeDataSource) b).hasChange() ? 0 : 1;
cmp = ai - bi;
}
if (cmp == 0) {
cmp = a.getCost() - b.getCost();
}
if (cmp == 0 //
&& a instanceof ChangeDataSource //
&& b instanceof ChangeDataSource) {
ChangeDataSource as = (ChangeDataSource) a;
ChangeDataSource bs = (ChangeDataSource) b;
cmp = as.getCardinality() - bs.getCardinality();
}
return cmp;
}
};
private static List<Predicate<ChangeData>> sort(
Collection<? extends Predicate<ChangeData>> that) {
ArrayList<Predicate<ChangeData>> r =
new ArrayList<Predicate<ChangeData>>(that);
Collections.sort(r, CMP);
return r;
}
private int cardinality = -1;
AndSource(final Collection<? extends Predicate<ChangeData>> that) {
super(sort(that));
}
@Override
public boolean hasChange() {
ChangeDataSource source = source();
return source != null && source.hasChange();
}
@Override
public ResultSet<ChangeData> read() throws OrmException {
ChangeDataSource source = source();
if (source == null) {
throw new OrmException("No ChangeDataSource: " + this);
}
// TODO(spearce) This probably should be more lazy.
//
ArrayList<ChangeData> r = new ArrayList<ChangeData>();
ChangeData last = null;
boolean skipped = false;
for (ChangeData data : source.read()) {
if (match(data)) {
r.add(data);
} else {
skipped = true;
}
last = data;
}
if (skipped && last != null && source instanceof Paginated) {
// If we our source is a paginated source and we skipped at
// least one of its results, we may not have filled the full
// limit the caller wants. Restart the source and continue.
//
Paginated p = (Paginated) source;
while (skipped && r.size() < p.limit()) {
ChangeData lastBeforeRestart = last;
skipped = false;
last = null;
for (ChangeData data : p.restart(lastBeforeRestart)) {
if (match(data)) {
r.add(data);
} else {
skipped = true;
}
last = data;
}
}
}
return new ListResultSet<ChangeData>(r);
}
private ChangeDataSource source() {
for (Predicate<ChangeData> p : getChildren()) {
if (p instanceof ChangeDataSource) {
return (ChangeDataSource) p;
}
}
return null;
}
@Override
public int getCardinality() {
if (cardinality < 0) {
cardinality = Integer.MAX_VALUE;
for (Predicate<ChangeData> p : getChildren()) {
if (p instanceof ChangeDataSource) {
int c = ((ChangeDataSource) p).getCardinality();
cardinality = Math.min(cardinality, c);
}
}
}
return cardinality;
}
}
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