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/**
*
* Copyright (c) 2006-2019, Speedment, Inc. All Rights Reserved.
*
* 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.speedment.runtime.core.internal.stream.builder.streamterminator;
import com.speedment.runtime.core.component.sql.SqlStreamOptimizerInfo;
import com.speedment.runtime.core.db.AsynchronousQueryResult;
import com.speedment.runtime.core.db.DbmsType;
import com.speedment.runtime.core.db.FieldPredicateView;
import com.speedment.runtime.core.db.SqlPredicateFragment;
import com.speedment.runtime.core.internal.stream.builder.action.reference.FilterAction;
import com.speedment.runtime.core.internal.stream.builder.action.reference.SortedComparatorAction;
import com.speedment.runtime.core.internal.util.Cast;
import com.speedment.runtime.core.stream.Pipeline;
import com.speedment.runtime.core.stream.action.Action;
import com.speedment.runtime.field.Field;
import com.speedment.runtime.field.comparator.CombinedComparator;
import com.speedment.runtime.field.comparator.FieldComparator;
import com.speedment.runtime.field.internal.predicate.AbstractCombinedPredicate;
import com.speedment.runtime.field.predicate.CombinedPredicate;
import com.speedment.runtime.field.predicate.FieldPredicate;
import com.speedment.runtime.field.predicate.PredicateType;
import com.speedment.runtime.typemapper.TypeMapper;
import com.speedment.runtime.typemapper.TypeMapper.Ordering;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import java.util.function.Predicate;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;
/**
*
* @author pemi
*/
public final class StreamTerminatorUtil {
public static List> topLevelAndPredicates(T initialPipeline) {
final List> andPredicateBuilders = new ArrayList<>();
for (final Action action : initialPipeline) {
@SuppressWarnings("rawtypes")
final Optional oFilterAction = Cast.cast(action, FilterAction.class);
if (oFilterAction.isPresent()) {
@SuppressWarnings("unchecked")
final List> newAndPredicates = andPredicates(oFilterAction.get());
andPredicateBuilders.addAll(newAndPredicates);
} else {
break; // We can only do initial consecutive FilterAction(s)
}
}
return andPredicateBuilders;
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static List> andPredicates(FilterAction action) {
requireNonNull(action);
final List> andPredicateBuilders = new ArrayList<>();
final Predicate predicate = action.getPredicate();
final Optional oPredicateBuilder = Cast.cast(predicate, FieldPredicate.class);
if (oPredicateBuilder.isPresent()) {
andPredicateBuilders.add(oPredicateBuilder.get()); // Just a top level predicate builder
} else {
final Optional oAndCombinedBasePredicate = Cast.cast(predicate, AbstractCombinedPredicate.AndCombinedBasePredicate.class);
if (oAndCombinedBasePredicate.isPresent()) {
final AbstractCombinedPredicate.AndCombinedBasePredicate andCombinedBasePredicate = (AbstractCombinedPredicate.AndCombinedBasePredicate) oAndCombinedBasePredicate.get();
andCombinedBasePredicate.stream()
.map(p -> Cast.cast(p, FieldPredicate.class))
.filter(p -> p.isPresent())
.map(Optional::get)
.forEachOrdered(andPredicateBuilders::add);
}
}
return andPredicateBuilders;
}
private static final Set NON_COMPARATIVE_PREDICATES
= EnumSet.complementOf(
EnumSet.of(
PredicateType.BETWEEN,
PredicateType.GREATER_OR_EQUAL,
PredicateType.GREATER_THAN,
PredicateType.LESS_OR_EQUAL,
PredicateType.LESS_THAN,
PredicateType.NOT_BETWEEN
)
);
public static boolean isContainingOnlyFieldPredicate(Predicate predicate) {
if (predicate instanceof FieldPredicate) {
final FieldPredicate fieldPredicate = (FieldPredicate) predicate;
// We can only optimize filters if the ordering is retained.. Bar equal, isNull, isNotNull etc.
return fieldPredicate.getField().typeMapper().getOrdering() == Ordering.RETAIN
|| NON_COMPARATIVE_PREDICATES.contains(fieldPredicate.getPredicateType());
} else if (predicate instanceof CombinedPredicate) {
return ((CombinedPredicate) predicate).stream().allMatch(StreamTerminatorUtil::isContainingOnlyFieldPredicate);
}
return false;
}
public static boolean isSortedActionWithFieldPredicate(Action action) {
if (action instanceof SortedComparatorAction) {
final SortedComparatorAction sortedComparatorAction = (SortedComparatorAction) action;
final Comparator comparator = sortedComparatorAction.getComparator();
if (comparator instanceof FieldComparator) {
final FieldComparator fieldComparator = (FieldComparator) comparator;
// We can only optimize filters if the ordering is retained.. Bar equal, isNull, isNotNull etc.
return fieldComparator.getField().typeMapper().getOrdering() == Ordering.RETAIN;
}
if (comparator instanceof CombinedComparator) {
final CombinedComparator combinedComparator = (CombinedComparator) comparator;
// We can only optimize filters if the ordering is retained.. Bar equal, isNull, isNotNull etc.
return combinedComparator.stream()
.map(FieldComparator::getField)
.map(Field::typeMapper)
.map(TypeMapper::getOrdering)
.allMatch(o -> o == Ordering.RETAIN);
}
}
return false;
}
public static void modifySource(
final List> predicateBuilders,
final SqlStreamOptimizerInfo info,
final AsynchronousQueryResult query
) {
requireNonNull(predicateBuilders);
requireNonNull(info);
requireNonNull(query);
final List> optimizedPredicateBuilders = optimize(predicateBuilders);
final FieldPredicateView spv = info.getDbmsType().getFieldPredicateView();
final List fragments = optimizedPredicateBuilders.stream()
.map(sp -> spv.transform(info.getSqlColumnNamer(), info.getSqlDatabaseTypeFunction(), sp))
.collect(toList());
final String sql = info.getSqlSelect() + " WHERE "
+ fragments.stream()
.map(SqlPredicateFragment::getSql)
.collect(joining(" AND "));
final List