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/*
* 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.action.support.ToXContentToBytes;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.NamedWriteable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.search.rescore.QueryRescorer.QueryRescoreContext;
import java.io.IOException;
import java.util.Objects;
/**
* The abstract base builder for instances of {@link RescoreBuilder}.
*/
public abstract class RescoreBuilder<RB extends RescoreBuilder<RB>> extends ToXContentToBytes implements NamedWriteable {
protected Integer windowSize;
private static ParseField WINDOW_SIZE_FIELD = new ParseField("window_size");
/**
* Construct an empty RescoreBuilder.
*/
public RescoreBuilder() {
}
/**
* Read from a stream.
*/
protected RescoreBuilder(StreamInput in) throws IOException {
windowSize = in.readOptionalVInt();
}
@Override
public final void writeTo(StreamOutput out) throws IOException {
out.writeOptionalVInt(this.windowSize);
doWriteTo(out);
}
protected abstract void doWriteTo(StreamOutput out) throws IOException;
@SuppressWarnings("unchecked")
public RB windowSize(int windowSize) {
this.windowSize = windowSize;
return (RB) this;
}
public Integer windowSize() {
return windowSize;
}
public static RescoreBuilder<?> parseFromXContent(QueryParseContext parseContext) throws IOException {
XContentParser parser = parseContext.parser();
String fieldName = null;
RescoreBuilder<?> rescorer = null;
Integer windowSize = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
} else if (token.isValue()) {
if (WINDOW_SIZE_FIELD.match(fieldName)) {
windowSize = parser.intValue();
} else {
throw new ParsingException(parser.getTokenLocation(), "rescore doesn't support [" + fieldName + "]");
}
} else if (token == XContentParser.Token.START_OBJECT) {
// we only have QueryRescorer at this point
if (QueryRescorerBuilder.NAME.equals(fieldName)) {
rescorer = QueryRescorerBuilder.fromXContent(parseContext);
} else {
throw new ParsingException(parser.getTokenLocation(), "rescore doesn't support rescorer with name [" + fieldName + "]");
}
} else {
throw new ParsingException(parser.getTokenLocation(), "unexpected token [" + token + "] after [" + fieldName + "]");
}
}
if (rescorer == null) {
throw new ParsingException(parser.getTokenLocation(), "missing rescore type");
}
if (windowSize != null) {
rescorer.windowSize(windowSize.intValue());
}
return rescorer;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
if (windowSize != null) {
builder.field("window_size", windowSize);
}
doXContent(builder, params);
builder.endObject();
return builder;
}
protected abstract void doXContent(XContentBuilder builder, Params params) throws IOException;
public abstract QueryRescoreContext build(QueryShardContext context) throws IOException;
public static QueryRescorerBuilder queryRescorer(QueryBuilder queryBuilder) {
return new QueryRescorerBuilder(queryBuilder);
}
@Override
public int hashCode() {
return Objects.hash(windowSize);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
@SuppressWarnings("rawtypes")
RescoreBuilder other = (RescoreBuilder) obj;
return Objects.equals(windowSize, other.windowSize);
}
}
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