/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.lucene.queries.function.valuesource;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.BoolDocValues;
import org.apache.lucene.search.IndexSearcher;
import java.io.IOException;
import java.util.Map;
/**
* {@link BoolFunction} implementation which applies an extendible boolean
* function to the values of a single wrapped {@link ValueSource}.
*
* Functions this can be used for include whether a field has a value or not,
* or inverting the boolean value of the wrapped ValueSource.
*/
public abstract class SimpleBoolFunction extends BoolFunction {
protected final ValueSource source;
public SimpleBoolFunction(ValueSource source) {
this.source = source;
}
protected abstract String name();
protected abstract boolean func(int doc, FunctionValues vals);
@Override
public BoolDocValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
final FunctionValues vals = source.getValues(context, readerContext);
return new BoolDocValues(this) {
@Override
public boolean boolVal(int doc) {
return func(doc, vals);
}
@Override
public String toString(int doc) {
return name() + '(' + vals.toString(doc) + ')';
}
};
}
@Override
public String description() {
return name() + '(' + source.description() + ')';
}
@Override
public int hashCode() {
return source.hashCode() + name().hashCode();
}
@Override
public boolean equals(Object o) {
if (this.getClass() != o.getClass()) return false;
SimpleBoolFunction other = (SimpleBoolFunction)o;
return this.source.equals(other.source);
}
@Override
public void createWeight(Map context, IndexSearcher searcher) throws IOException {
source.createWeight(context, searcher);
}
}