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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.suggest.completion;
import org.apache.lucene.util.automaton.Operations;
import org.apache.lucene.util.automaton.RegExp;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParseFieldMatcherSupplier;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.RegexpFlag;
import java.io.IOException;
/**
* Regular expression options for completion suggester
*/
public class RegexOptions implements ToXContent, Writeable {
static final ParseField REGEX_OPTIONS = new ParseField("regex");
private static final ParseField FLAGS_VALUE = new ParseField("flags", "flags_value");
private static final ParseField MAX_DETERMINIZED_STATES = new ParseField("max_determinized_states");
/**
* regex: {
* "flags" : STRING | INT
* "max_determinized_states" : INT
* }
*/
private static ObjectParser<Builder, ParseFieldMatcherSupplier> PARSER = new ObjectParser<>(REGEX_OPTIONS.getPreferredName(),
Builder::new);
static {
PARSER.declareInt(Builder::setMaxDeterminizedStates, MAX_DETERMINIZED_STATES);
PARSER.declareField((parser, builder, aVoid) -> {
if (parser.currentToken() == XContentParser.Token.VALUE_STRING) {
builder.setFlags(parser.text());
} else if (parser.currentToken() == XContentParser.Token.VALUE_NUMBER) {
builder.setFlagsValue(parser.intValue());
} else {
throw new ElasticsearchParseException(REGEX_OPTIONS.getPreferredName()
+ " " + FLAGS_VALUE.getPreferredName() + " supports string or number");
}
}, FLAGS_VALUE, ObjectParser.ValueType.VALUE);
PARSER.declareStringOrNull(Builder::setFlags, FLAGS_VALUE);
}
private int flagsValue;
private int maxDeterminizedStates;
private RegexOptions(int flagsValue, int maxDeterminizedStates) {
this.flagsValue = flagsValue;
this.maxDeterminizedStates = maxDeterminizedStates;
}
/**
* Read from a stream.
*/
RegexOptions(StreamInput in) throws IOException {
this.flagsValue = in.readVInt();
this.maxDeterminizedStates = in.readVInt();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeVInt(flagsValue);
out.writeVInt(maxDeterminizedStates);
}
/**
* Returns internal regular expression syntax flag value
* see {@link RegexpFlag#value()}
*/
public int getFlagsValue() {
return flagsValue;
}
/**
* Returns the maximum automaton states allowed for fuzzy expansion
*/
public int getMaxDeterminizedStates() {
return maxDeterminizedStates;
}
public static Builder builder() {
return new Builder();
}
static RegexOptions parse(XContentParser parser, ParseFieldMatcherSupplier context) throws IOException {
return PARSER.parse(parser, context).build();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
RegexOptions that = (RegexOptions) o;
if (flagsValue != that.flagsValue) return false;
return maxDeterminizedStates == that.maxDeterminizedStates;
}
@Override
public int hashCode() {
int result = flagsValue;
result = 31 * result + maxDeterminizedStates;
return result;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(REGEX_OPTIONS.getPreferredName());
builder.field(FLAGS_VALUE.getPreferredName(), flagsValue);
builder.field(MAX_DETERMINIZED_STATES.getPreferredName(), maxDeterminizedStates);
builder.endObject();
return builder;
}
/**
* Options for regular expression queries
*/
public static class Builder {
private int flagsValue = RegExp.ALL;
private int maxDeterminizedStates = Operations.DEFAULT_MAX_DETERMINIZED_STATES;
public Builder() {
}
/**
* Sets the regular expression syntax flags
* see {@link RegexpFlag}
*/
public Builder setFlags(String flags) {
this.flagsValue = RegexpFlag.resolveValue(flags);
return this;
}
private Builder setFlagsValue(int flagsValue) {
this.flagsValue = flagsValue;
return this;
}
/**
* Sets the maximum automaton states allowed for the regular expression expansion
*/
public Builder setMaxDeterminizedStates(int maxDeterminizedStates) {
if (maxDeterminizedStates < 0) {
throw new IllegalArgumentException("maxDeterminizedStates must not be negative");
}
this.maxDeterminizedStates = maxDeterminizedStates;
return this;
}
public RegexOptions build() {
return new RegexOptions(flagsValue, maxDeterminizedStates);
}
}
}
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