/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.rescore;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import java.io.IOException;
import java.util.Locale;
public enum QueryRescoreMode implements Writeable {
Avg {
@Override
public float combine(float primary, float secondary) {
return (primary + secondary) / 2;
}
@Override
public String toString() {
return "avg";
}
},
Max {
@Override
public float combine(float primary, float secondary) {
return Math.max(primary, secondary);
}
@Override
public String toString() {
return "max";
}
},
Min {
@Override
public float combine(float primary, float secondary) {
return Math.min(primary, secondary);
}
@Override
public String toString() {
return "min";
}
},
Total {
@Override
public float combine(float primary, float secondary) {
return primary + secondary;
}
@Override
public String toString() {
return "sum";
}
},
Multiply {
@Override
public float combine(float primary, float secondary) {
return primary * secondary;
}
@Override
public String toString() {
return "product";
}
};
public abstract float combine(float primary, float secondary);
public static QueryRescoreMode readFromStream(StreamInput in) throws IOException {
return in.readEnum(QueryRescoreMode.class);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeEnum(this);
}
public static QueryRescoreMode fromString(String scoreMode) {
for (QueryRescoreMode mode : values()) {
if (scoreMode.toLowerCase(Locale.ROOT).equals(mode.name().toLowerCase(Locale.ROOT))) {
return mode;
}
}
throw new IllegalArgumentException("illegal score_mode [" + scoreMode + "]");
}
@Override
public String toString() {
return name().toLowerCase(Locale.ROOT);
}
}