org.elasticsearch.index.query.FuzzyQueryBuilder Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.index.Term;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.ParseField;
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.BytesRefs;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.query.support.QueryParsers;
import java.io.IOException;
import java.util.Objects;
/**
* A Query that does fuzzy matching for a specific value.
*
* @deprecated Fuzzy queries are not useful enough. This class will be removed with Elasticsearch 4.0. In most cases you may want to use
* a match query with the fuzziness parameter for strings or range queries for numeric and date fields.
*/
@Deprecated
public class FuzzyQueryBuilder extends AbstractQueryBuilder implements MultiTermQueryBuilder {
public static final String NAME = "fuzzy";
public static final ParseField QUERY_NAME_FIELD = new ParseField(NAME);
/** Default maximum edit distance. Defaults to AUTO. */
public static final Fuzziness DEFAULT_FUZZINESS = Fuzziness.AUTO;
/** Default number of initial characters which will not be “fuzzified”. Defaults to 0. */
public static final int DEFAULT_PREFIX_LENGTH = FuzzyQuery.defaultPrefixLength;
/** Default maximum number of terms that the fuzzy query will expand to. Defaults to 50. */
public static final int DEFAULT_MAX_EXPANSIONS = FuzzyQuery.defaultMaxExpansions;
/** Default as to whether transpositions should be treated as a primitive edit operation,
* instead of classic Levenshtein algorithm. Defaults to false. */
public static final boolean DEFAULT_TRANSPOSITIONS = false;
private static final ParseField TERM_FIELD = new ParseField("term");
private static final ParseField VALUE_FIELD = new ParseField("value");
private static final ParseField PREFIX_LENGTH_FIELD = new ParseField("prefix_length");
private static final ParseField MAX_EXPANSIONS_FIELD = new ParseField("max_expansions");
private static final ParseField TRANSPOSITIONS_FIELD = new ParseField("transpositions");
private static final ParseField REWRITE_FIELD = new ParseField("rewrite");
private final String fieldName;
private final Object value;
private Fuzziness fuzziness = DEFAULT_FUZZINESS;
private int prefixLength = DEFAULT_PREFIX_LENGTH;
private int maxExpansions = DEFAULT_MAX_EXPANSIONS;
//LUCENE 4 UPGRADE we need a testcase for this + documentation
private boolean transpositions = DEFAULT_TRANSPOSITIONS;
private String rewrite;
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, String value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, int value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, long value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, float value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, double value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the text
*/
public FuzzyQueryBuilder(String fieldName, boolean value) {
this(fieldName, (Object) value);
}
/**
* Constructs a new fuzzy query.
*
* @param fieldName The name of the field
* @param value The value of the term
*/
public FuzzyQueryBuilder(String fieldName, Object value) {
if (Strings.isEmpty(fieldName)) {
throw new IllegalArgumentException("field name cannot be null or empty.");
}
if (value == null) {
throw new IllegalArgumentException("query value cannot be null");
}
this.fieldName = fieldName;
this.value = convertToBytesRefIfString(value);
}
/**
* Read from a stream.
*/
public FuzzyQueryBuilder(StreamInput in) throws IOException {
super(in);
fieldName = in.readString();
value = in.readGenericValue();
fuzziness = new Fuzziness(in);
prefixLength = in.readVInt();
maxExpansions = in.readVInt();
transpositions = in.readBoolean();
rewrite = in.readOptionalString();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeString(this.fieldName);
out.writeGenericValue(this.value);
this.fuzziness.writeTo(out);
out.writeVInt(this.prefixLength);
out.writeVInt(this.maxExpansions);
out.writeBoolean(this.transpositions);
out.writeOptionalString(this.rewrite);
}
public String fieldName() {
return this.fieldName;
}
public Object value() {
return convertToStringIfBytesRef(this.value);
}
public FuzzyQueryBuilder fuzziness(Fuzziness fuzziness) {
this.fuzziness = (fuzziness == null) ? DEFAULT_FUZZINESS : fuzziness;
return this;
}
public Fuzziness fuzziness() {
return this.fuzziness;
}
public FuzzyQueryBuilder prefixLength(int prefixLength) {
this.prefixLength = prefixLength;
return this;
}
public int prefixLength() {
return this.prefixLength;
}
public FuzzyQueryBuilder maxExpansions(int maxExpansions) {
this.maxExpansions = maxExpansions;
return this;
}
public int maxExpansions() {
return this.maxExpansions;
}
public FuzzyQueryBuilder transpositions(boolean transpositions) {
this.transpositions = transpositions;
return this;
}
public boolean transpositions() {
return this.transpositions;
}
public FuzzyQueryBuilder rewrite(String rewrite) {
this.rewrite = rewrite;
return this;
}
public String rewrite() {
return this.rewrite;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
builder.startObject(fieldName);
builder.field(VALUE_FIELD.getPreferredName(), convertToStringIfBytesRef(this.value));
fuzziness.toXContent(builder, params);
builder.field(PREFIX_LENGTH_FIELD.getPreferredName(), prefixLength);
builder.field(MAX_EXPANSIONS_FIELD.getPreferredName(), maxExpansions);
builder.field(TRANSPOSITIONS_FIELD.getPreferredName(), transpositions);
if (rewrite != null) {
builder.field(REWRITE_FIELD.getPreferredName(), rewrite);
}
printBoostAndQueryName(builder);
builder.endObject();
builder.endObject();
}
public static FuzzyQueryBuilder fromXContent(QueryParseContext parseContext) throws IOException {
XContentParser parser = parseContext.parser();
XContentParser.Token token = parser.nextToken();
if (token != XContentParser.Token.FIELD_NAME) {
throw new ParsingException(parser.getTokenLocation(), "[fuzzy] query malformed, no field");
}
String fieldName = parser.currentName();
Object value = null;
Fuzziness fuzziness = FuzzyQueryBuilder.DEFAULT_FUZZINESS;
int prefixLength = FuzzyQueryBuilder.DEFAULT_PREFIX_LENGTH;
int maxExpansions = FuzzyQueryBuilder.DEFAULT_MAX_EXPANSIONS;
boolean transpositions = FuzzyQueryBuilder.DEFAULT_TRANSPOSITIONS;
String rewrite = null;
String queryName = null;
float boost = AbstractQueryBuilder.DEFAULT_BOOST;
token = parser.nextToken();
if (token == XContentParser.Token.START_OBJECT) {
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else {
if (parseContext.getParseFieldMatcher().match(currentFieldName, TERM_FIELD)) {
value = parser.objectBytes();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, VALUE_FIELD)) {
value = parser.objectBytes();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.BOOST_FIELD)) {
boost = parser.floatValue();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, Fuzziness.FIELD)) {
fuzziness = Fuzziness.parse(parser);
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, PREFIX_LENGTH_FIELD)) {
prefixLength = parser.intValue();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, MAX_EXPANSIONS_FIELD)) {
maxExpansions = parser.intValue();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, TRANSPOSITIONS_FIELD)) {
transpositions = parser.booleanValue();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, REWRITE_FIELD)) {
rewrite = parser.textOrNull();
} else if (parseContext.getParseFieldMatcher().match(currentFieldName, AbstractQueryBuilder.NAME_FIELD)) {
queryName = parser.text();
} else {
throw new ParsingException(parser.getTokenLocation(), "[fuzzy] query does not support [" + currentFieldName + "]");
}
}
}
parser.nextToken();
} else {
value = parser.objectBytes();
// move to the next token
parser.nextToken();
}
if (value == null) {
throw new ParsingException(parser.getTokenLocation(), "no value specified for fuzzy query");
}
return new FuzzyQueryBuilder(fieldName, value)
.fuzziness(fuzziness)
.prefixLength(prefixLength)
.maxExpansions(maxExpansions)
.transpositions(transpositions)
.rewrite(rewrite)
.boost(boost)
.queryName(queryName);
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
Query query = null;
String rewrite = this.rewrite;
if (rewrite == null && context.isFilter()) {
rewrite = QueryParsers.CONSTANT_SCORE.getPreferredName();
}
MappedFieldType fieldType = context.fieldMapper(fieldName);
if (fieldType != null) {
query = fieldType.fuzzyQuery(value, fuzziness, prefixLength, maxExpansions, transpositions);
}
if (query == null) {
int maxEdits = fuzziness.asDistance(BytesRefs.toString(value));
query = new FuzzyQuery(new Term(fieldName, BytesRefs.toBytesRef(value)), maxEdits, prefixLength, maxExpansions, transpositions);
}
if (query instanceof MultiTermQuery) {
MultiTermQuery.RewriteMethod rewriteMethod = QueryParsers.parseRewriteMethod(context.getParseFieldMatcher(), rewrite, null);
QueryParsers.setRewriteMethod((MultiTermQuery) query, rewriteMethod);
}
return query;
}
@Override
protected int doHashCode() {
return Objects.hash(fieldName, value, fuzziness, prefixLength, maxExpansions, transpositions, rewrite);
}
@Override
protected boolean doEquals(FuzzyQueryBuilder other) {
return Objects.equals(fieldName, other.fieldName) &&
Objects.equals(value, other.value) &&
Objects.equals(fuzziness, other.fuzziness) &&
Objects.equals(prefixLength, other.prefixLength) &&
Objects.equals(maxExpansions, other.maxExpansions) &&
Objects.equals(transpositions, other.transpositions) &&
Objects.equals(rewrite, other.rewrite);
}
}