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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.query;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.xcontent.ObjectParser;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
/**
* A query that matches on all documents.
*/
public class MatchAllQueryBuilder extends AbstractQueryBuilder {
public static final String NAME = "match_all";
public MatchAllQueryBuilder() {}
/**
* Read from a stream.
*/
public MatchAllQueryBuilder(StreamInput in) throws IOException {
super(in);
}
@Override
protected void doWriteTo(StreamOutput out) {
// only superclass has state
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
printBoostAndQueryName(builder);
builder.endObject();
}
private static final ObjectParser PARSER = new ObjectParser<>(NAME, MatchAllQueryBuilder::new);
static {
declareStandardFields(PARSER);
}
public static MatchAllQueryBuilder fromXContent(XContentParser parser) {
try {
return PARSER.apply(parser, null);
} catch (IllegalArgumentException e) {
throw new ParsingException(parser.getTokenLocation(), e.getMessage(), e);
}
}
@Override
protected Query doToQuery(SearchExecutionContext context) {
return Queries.newMatchAllQuery();
}
@Override
protected boolean doEquals(MatchAllQueryBuilder other) {
return true;
}
@Override
protected int doHashCode() {
return 0;
}
@Override
public String getWriteableName() {
return NAME;
}
}