forked from elastic/elasticsearch
/
WildcardQueryBuilder.java
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/
WildcardQueryBuilder.java
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/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
/**
* Implements the wildcard search query. Supported wildcards are <tt>*</tt>, which
* matches any character sequence (including the empty one), and <tt>?</tt>,
* which matches any single character. Note this query can be slow, as it
* needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
* a Wildcard term should not start with one of the wildcards <tt>*</tt> or
* <tt>?</tt>.
*
* @author kimchy (shay.banon)
*/
public class WildcardQueryBuilder extends BaseQueryBuilder {
private final String name;
private final String wildcard;
private float boost = -1;
private String rewrite;
/**
* Implements the wildcard search query. Supported wildcards are <tt>*</tt>, which
* matches any character sequence (including the empty one), and <tt>?</tt>,
* which matches any single character. Note this query can be slow, as it
* needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
* a Wildcard term should not start with one of the wildcards <tt>*</tt> or
* <tt>?</tt>.
*
* @param name The field name
* @param wildcard The wildcard query string
*/
public WildcardQueryBuilder(String name, String wildcard) {
this.name = name;
this.wildcard = wildcard;
}
public WildcardQueryBuilder rewrite(String rewrite) {
this.rewrite = rewrite;
return this;
}
/**
* Sets the boost for this query. Documents matching this query will (in addition to the normal
* weightings) have their score multiplied by the boost provided.
*/
public WildcardQueryBuilder boost(float boost) {
this.boost = boost;
return this;
}
@Override public void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(WildcardQueryParser.NAME);
if (boost == -1 && rewrite != null) {
builder.field(name, wildcard);
} else {
builder.startObject(name);
builder.field("wildcard", wildcard);
if (boost != -1) {
builder.field("boost", boost);
}
if (rewrite != null) {
builder.field("rewrite", rewrite);
}
builder.endObject();
}
builder.endObject();
}
}