/*
* 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.index.IndexReader;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* Depending on the boolean value of the <code>ifSource</code> function,
* returns the value of the <code>trueSource</code> or <code>falseSource</code> function.
*/
public class IfFunction extends BoolFunction {
private final ValueSource ifSource;
private final ValueSource trueSource;
private final ValueSource falseSource;
public IfFunction(ValueSource ifSource, ValueSource trueSource, ValueSource falseSource) {
this.ifSource = ifSource;
this.trueSource = trueSource;
this.falseSource = falseSource;
}
@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
final FunctionValues ifVals = ifSource.getValues(context, readerContext);
final FunctionValues trueVals = trueSource.getValues(context, readerContext);
final FunctionValues falseVals = falseSource.getValues(context, readerContext);
return new FunctionValues() {
@Override
public byte byteVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.byteVal(doc) : falseVals.byteVal(doc);
}
@Override
public short shortVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.shortVal(doc) : falseVals.shortVal(doc);
}
@Override
public float floatVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.floatVal(doc) : falseVals.floatVal(doc);
}
@Override
public int intVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.intVal(doc) : falseVals.intVal(doc);
}
@Override
public long longVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.longVal(doc) : falseVals.longVal(doc);
}
@Override
public double doubleVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.doubleVal(doc) : falseVals.doubleVal(doc);
}
@Override
public String strVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.strVal(doc) : falseVals.strVal(doc);
}
@Override
public boolean boolVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.boolVal(doc) : falseVals.boolVal(doc);
}
@Override
public boolean bytesVal(int doc, BytesRef target) {
return ifVals.boolVal(doc) ? trueVals.bytesVal(doc, target) : falseVals.bytesVal(doc, target);
}
@Override
public Object objectVal(int doc) {
return ifVals.boolVal(doc) ? trueVals.objectVal(doc) : falseVals.objectVal(doc);
}
@Override
public boolean exists(int doc) {
return true; // TODO: flow through to any sub-sources?
}
@Override
public ValueFiller getValueFiller() {
// TODO: we need types of trueSource / falseSource to handle this
// for now, use float.
return super.getValueFiller();
}
@Override
public String toString(int doc) {
return "if(" + ifVals.toString(doc) + ',' + trueVals.toString(doc) + ',' + falseVals.toString(doc) + ')';
}
};
}
@Override
public String description() {
return "if(" + ifSource.description() + ',' + trueSource.description() + ',' + falseSource + ')';
}
@Override
public int hashCode() {
int h = ifSource.hashCode();
h = h * 31 + trueSource.hashCode();
h = h * 31 + falseSource.hashCode();
return h;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof IfFunction)) return false;
IfFunction other = (IfFunction)o;
return ifSource.equals(other.ifSource)
&& trueSource.equals(other.trueSource)
&& falseSource.equals(other.falseSource);
}
@Override
public void createWeight(Map context, IndexSearcher searcher) throws IOException {
ifSource.createWeight(context, searcher);
trueSource.createWeight(context, searcher);
falseSource.createWeight(context, searcher);
}
}