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LuceneNotQuery.java
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LuceneNotQuery.java
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/*
* LuceneNotQuery.java
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2022 Apple Inc. and the FoundationDB project authors
*
* 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.apple.foundationdb.record.lucene;
import com.apple.foundationdb.annotation.API;
import com.apple.foundationdb.record.EvaluationContext;
import com.apple.foundationdb.record.metadata.Index;
import com.apple.foundationdb.record.provider.foundationdb.FDBRecordStoreBase;
import com.apple.foundationdb.record.query.plan.cascades.explain.Attribute;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import javax.annotation.Nonnull;
/**
* Binder for a negation of another clause.
* Note that special casing is required to coalesce with a {@link LuceneBooleanQuery} with {@code MUST}.
*/
@API(API.Status.UNSTABLE)
public class LuceneNotQuery extends LuceneQueryClause {
@Nonnull
private final LuceneQueryClause child;
public LuceneNotQuery(@Nonnull LuceneQueryClause child) {
this.child = child;
}
@Nonnull
protected LuceneQueryClause getChild() {
return child;
}
@Override
public Query bind(@Nonnull FDBRecordStoreBase<?> store, @Nonnull Index index, @Nonnull EvaluationContext context) {
return negate(child.bind(store, index, context));
}
@Override
public void getPlannerGraphDetails(@Nonnull ImmutableList.Builder<String> detailsBuilder, @Nonnull ImmutableMap.Builder<String, Attribute> attributeMapBuilder) {
child.getPlannerGraphDetails(detailsBuilder, attributeMapBuilder);
}
@Override
public int planHash(@Nonnull final PlanHashKind hashKind) {
return child.planHash() + 3;
}
@Override
public String toString() {
return "NOT " + child;
}
// Used as a last resort when can't be merged with parent AND.
protected static Query negate(@Nonnull Query query) {
BooleanQuery.Builder builder = new BooleanQuery.Builder();
builder.add(new MatchAllDocsQuery(), BooleanClause.Occur.MUST);
builder.add(query, BooleanClause.Occur.MUST_NOT);
return builder.build();
}
}