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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.index.query;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.support.QueryParsers;
import org.elasticsearch.index.search.MatchQuery;
import java.io.IOException;
import java.util.Objects;
import static org.elasticsearch.index.query.MatchQueryBuilder.FUZZY_REWRITE_FIELD;
import static org.elasticsearch.index.query.MatchQueryBuilder.FUZZY_TRANSPOSITIONS_FIELD;
import static org.elasticsearch.index.query.MatchQueryBuilder.MAX_EXPANSIONS_FIELD;
import static org.elasticsearch.index.query.MatchQueryBuilder.OPERATOR_FIELD;
import static org.elasticsearch.index.query.MatchQueryBuilder.PREFIX_LENGTH_FIELD;
/**
* The boolean prefix query analyzes the input text and creates a boolean query containing a Term query for each term, except
* for the last term, which is used to create a prefix query
*/
public class MatchBoolPrefixQueryBuilder extends AbstractQueryBuilder {
public static final String NAME = "match_bool_prefix";
private static final Operator DEFAULT_OPERATOR = Operator.OR;
private final String fieldName;
private final Object value;
private String analyzer;
private Operator operator = DEFAULT_OPERATOR;
private String minimumShouldMatch;
private Fuzziness fuzziness;
private int prefixLength = FuzzyQuery.defaultPrefixLength;
private int maxExpansions = FuzzyQuery.defaultMaxExpansions;
private boolean fuzzyTranspositions = FuzzyQuery.defaultTranspositions;
private String fuzzyRewrite;
public MatchBoolPrefixQueryBuilder(String fieldName, Object value) {
if (Strings.isEmpty(fieldName)) {
throw new IllegalArgumentException("[" + NAME + "] requires fieldName");
}
if (value == null) {
throw new IllegalArgumentException("[" + NAME + "] requires query value");
}
this.fieldName = fieldName;
this.value = value;
}
public MatchBoolPrefixQueryBuilder(StreamInput in) throws IOException {
super(in);
fieldName = in.readString();
value = in.readGenericValue();
analyzer = in.readOptionalString();
operator = Operator.readFromStream(in);
minimumShouldMatch = in.readOptionalString();
fuzziness = in.readOptionalWriteable(Fuzziness::new);
prefixLength = in.readVInt();
maxExpansions = in.readVInt();
fuzzyTranspositions = in.readBoolean();
fuzzyRewrite = in.readOptionalString();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeString(fieldName);
out.writeGenericValue(value);
out.writeOptionalString(analyzer);
operator.writeTo(out);
out.writeOptionalString(minimumShouldMatch);
out.writeOptionalWriteable(fuzziness);
out.writeVInt(prefixLength);
out.writeVInt(maxExpansions);
out.writeBoolean(fuzzyTranspositions);
out.writeOptionalString(fuzzyRewrite);
}
/** Returns the field name used in this query. */
public String fieldName() {
return this.fieldName;
}
/** Returns the value used in this query. */
public Object value() {
return this.value;
}
/** Get the analyzer to use, if previously set, otherwise {@code null} */
public String analyzer() {
return this.analyzer;
}
/**
* Explicitly set the analyzer to use. Defaults to use explicit mapping
* config for the field, or, if not set, the default search analyzer.
*/
public MatchBoolPrefixQueryBuilder analyzer(String analyzer) {
this.analyzer = analyzer;
return this;
}
/** Sets the operator to use when using a boolean query. Defaults to {@code OR}. */
public MatchBoolPrefixQueryBuilder operator(Operator operator) {
if (operator == null) {
throw new IllegalArgumentException("[" + NAME + "] requires operator to be non-null");
}
this.operator = operator;
return this;
}
/** Returns the operator to use in a boolean query.*/
public Operator operator() {
return this.operator;
}
/** Sets optional minimumShouldMatch value to apply to the query */
public MatchBoolPrefixQueryBuilder minimumShouldMatch(String minimumShouldMatch) {
this.minimumShouldMatch = minimumShouldMatch;
return this;
}
/** Gets the minimumShouldMatch value */
public String minimumShouldMatch() {
return this.minimumShouldMatch;
}
/** Sets the fuzziness used when evaluated to a fuzzy query type. Defaults to "AUTO". */
public MatchBoolPrefixQueryBuilder fuzziness(Object fuzziness) {
this.fuzziness = Fuzziness.build(fuzziness);
return this;
}
/** Gets the fuzziness used when evaluated to a fuzzy query type. */
public Fuzziness fuzziness() {
return this.fuzziness;
}
/**
* Sets the length of a length of common (non-fuzzy) prefix for fuzzy match queries
* @param prefixLength non-negative length of prefix
* @throws IllegalArgumentException in case the prefix is negative
*/
public MatchBoolPrefixQueryBuilder prefixLength(int prefixLength) {
if (prefixLength < 0 ) {
throw new IllegalArgumentException("[" + NAME + "] requires prefix length to be non-negative.");
}
this.prefixLength = prefixLength;
return this;
}
/**
* Gets the length of a length of common (non-fuzzy) prefix for fuzzy match queries
*/
public int prefixLength() {
return this.prefixLength;
}
/**
* When using fuzzy or prefix type query, the number of term expansions to use.
*/
public MatchBoolPrefixQueryBuilder maxExpansions(int maxExpansions) {
if (maxExpansions <= 0 ) {
throw new IllegalArgumentException("[" + NAME + "] requires maxExpansions to be positive.");
}
this.maxExpansions = maxExpansions;
return this;
}
/**
* Get the (optional) number of term expansions when using fuzzy or prefix type query.
*/
public int maxExpansions() {
return this.maxExpansions;
}
/**
* Sets whether transpositions are supported in fuzzy queries.
* The default metric used by fuzzy queries to determine a match is the Damerau-Levenshtein
* distance formula which supports transpositions. Setting transposition to false will
* switch to classic Levenshtein distance.
* If not set, Damerau-Levenshtein distance metric will be used.
*/
public MatchBoolPrefixQueryBuilder fuzzyTranspositions(boolean fuzzyTranspositions) {
this.fuzzyTranspositions = fuzzyTranspositions;
return this;
}
/** Gets the fuzzy query transposition setting. */
public boolean fuzzyTranspositions() {
return this.fuzzyTranspositions;
}
/** Sets the fuzzy_rewrite parameter controlling how the fuzzy query will get rewritten */
public MatchBoolPrefixQueryBuilder fuzzyRewrite(String fuzzyRewrite) {
this.fuzzyRewrite = fuzzyRewrite;
return this;
}
/**
* Get the fuzzy_rewrite parameter
* @see #fuzzyRewrite(String)
*/
public String fuzzyRewrite() {
return this.fuzzyRewrite;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
builder.startObject(fieldName);
builder.field(MatchQueryBuilder.QUERY_FIELD.getPreferredName(), value);
if (analyzer != null) {
builder.field(MatchQueryBuilder.ANALYZER_FIELD.getPreferredName(), analyzer);
}
builder.field(OPERATOR_FIELD.getPreferredName(), operator.toString());
if (minimumShouldMatch != null) {
builder.field(MatchQueryBuilder.MINIMUM_SHOULD_MATCH_FIELD.getPreferredName(), minimumShouldMatch);
}
if (fuzziness != null) {
fuzziness.toXContent(builder, params);
}
builder.field(PREFIX_LENGTH_FIELD.getPreferredName(), prefixLength);
builder.field(MAX_EXPANSIONS_FIELD.getPreferredName(), maxExpansions);
builder.field(FUZZY_TRANSPOSITIONS_FIELD.getPreferredName(), fuzzyTranspositions);
if (fuzzyRewrite != null) {
builder.field(FUZZY_REWRITE_FIELD.getPreferredName(), fuzzyRewrite);
}
printBoostAndQueryName(builder);
builder.endObject();
builder.endObject();
}
public static MatchBoolPrefixQueryBuilder fromXContent(XContentParser parser) throws IOException {
String fieldName = null;
Object value = null;
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
String analyzer = null;
Operator operator = DEFAULT_OPERATOR;
String minimumShouldMatch = null;
Fuzziness fuzziness = null;
int prefixLength = FuzzyQuery.defaultPrefixLength;
int maxExpansion = FuzzyQuery.defaultMaxExpansions;
boolean fuzzyTranspositions = FuzzyQuery.defaultTranspositions;
String fuzzyRewrite = null;
String queryName = null;
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
throwParsingExceptionOnMultipleFields(NAME, parser.getTokenLocation(), fieldName, currentFieldName);
fieldName = currentFieldName;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if (MatchQueryBuilder.QUERY_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
value = parser.objectText();
} else if (MatchQueryBuilder.ANALYZER_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
analyzer = parser.text();
} else if (OPERATOR_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
operator = Operator.fromString(parser.text());
} else if (MatchQueryBuilder.MINIMUM_SHOULD_MATCH_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
minimumShouldMatch = parser.textOrNull();
} else if (Fuzziness.FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
fuzziness = Fuzziness.parse(parser);
} else if (PREFIX_LENGTH_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
prefixLength = parser.intValue();
} else if (MAX_EXPANSIONS_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
maxExpansion = parser.intValue();
} else if (FUZZY_TRANSPOSITIONS_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
fuzzyTranspositions = parser.booleanValue();
} else if (FUZZY_REWRITE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
fuzzyRewrite = parser.textOrNull();
} else if (AbstractQueryBuilder.BOOST_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
boost = parser.floatValue();
} else if (AbstractQueryBuilder.NAME_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
queryName = parser.text();
} else {
throw new ParsingException(parser.getTokenLocation(),
"[" + NAME + "] query does not support [" + currentFieldName + "]");
}
} else {
throw new ParsingException(parser.getTokenLocation(),
"[" + NAME + "] unknown token [" + token + "] after [" + currentFieldName + "]");
}
}
} else {
throwParsingExceptionOnMultipleFields(NAME, parser.getTokenLocation(), fieldName, parser.currentName());
fieldName = parser.currentName();
value = parser.objectText();
}
}
MatchBoolPrefixQueryBuilder queryBuilder = new MatchBoolPrefixQueryBuilder(fieldName, value);
queryBuilder.analyzer(analyzer);
queryBuilder.operator(operator);
queryBuilder.minimumShouldMatch(minimumShouldMatch);
queryBuilder.boost(boost);
queryBuilder.queryName(queryName);
if (fuzziness != null) {
queryBuilder.fuzziness(fuzziness);
}
queryBuilder.prefixLength(prefixLength);
queryBuilder.maxExpansions(maxExpansion);
queryBuilder.fuzzyTranspositions(fuzzyTranspositions);
queryBuilder.fuzzyRewrite(fuzzyRewrite);
return queryBuilder;
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
if (analyzer != null && context.getIndexAnalyzers().get(analyzer) == null) {
throw new QueryShardException(context, "[" + NAME + "] analyzer [" + analyzer + "] not found");
}
final MatchQuery matchQuery = new MatchQuery(context);
if (analyzer != null) {
matchQuery.setAnalyzer(analyzer);
}
matchQuery.setOccur(operator.toBooleanClauseOccur());
matchQuery.setFuzziness(fuzziness);
matchQuery.setFuzzyPrefixLength(prefixLength);
matchQuery.setMaxExpansions(maxExpansions);
matchQuery.setTranspositions(fuzzyTranspositions);
matchQuery.setFuzzyRewriteMethod(QueryParsers.parseRewriteMethod(fuzzyRewrite, null, LoggingDeprecationHandler.INSTANCE));
final Query query = matchQuery.parse(MatchQuery.Type.BOOLEAN_PREFIX, fieldName, value);
return Queries.maybeApplyMinimumShouldMatch(query, minimumShouldMatch);
}
@Override
protected boolean doEquals(MatchBoolPrefixQueryBuilder other) {
return Objects.equals(fieldName, other.fieldName) &&
Objects.equals(value, other.value) &&
Objects.equals(analyzer, other.analyzer) &&
Objects.equals(operator, other.operator) &&
Objects.equals(minimumShouldMatch, other.minimumShouldMatch) &&
Objects.equals(fuzziness, other.fuzziness) &&
Objects.equals(prefixLength, other.prefixLength) &&
Objects.equals(maxExpansions, other.maxExpansions) &&
Objects.equals(fuzzyTranspositions, other.fuzzyTranspositions) &&
Objects.equals(fuzzyRewrite, other.fuzzyRewrite);
}
@Override
protected int doHashCode() {
return Objects.hash(fieldName, value, analyzer, operator, minimumShouldMatch, fuzziness, prefixLength, maxExpansions,
fuzzyTranspositions, fuzzyRewrite);
}
@Override
public String getWriteableName() {
return NAME;
}
}