Package org.elasticsearch.index.query

Source Code of org.elasticsearch.index.query.SpanNotQueryParser

/*
* 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.Query;
import org.apache.lucene.search.spans.SpanNotQuery;
import org.apache.lucene.search.spans.SpanQuery;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;

import java.io.IOException;

/**
*
*/
public class SpanNotQueryParser implements QueryParser {

    public static final String NAME = "span_not";

    @Inject
    public SpanNotQueryParser() {
    }

    @Override
    public String[] names() {
        return new String[]{NAME, Strings.toCamelCase(NAME)};
    }

    @Override
    public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
        XContentParser parser = parseContext.parser();

        float boost = 1.0f;

        SpanQuery include = null;
        SpanQuery exclude = null;
        String queryName = null;

        String currentFieldName = null;
        XContentParser.Token token;
        while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
            if (token == XContentParser.Token.FIELD_NAME) {
                currentFieldName = parser.currentName();
            } else if (token == XContentParser.Token.START_OBJECT) {
                if ("include".equals(currentFieldName)) {
                    Query query = parseContext.parseInnerQuery();
                    if (!(query instanceof SpanQuery)) {
                        throw new QueryParsingException(parseContext.index(), "spanNot [include] must be of type span query");
                    }
                    include = (SpanQuery) query;
                } else if ("exclude".equals(currentFieldName)) {
                    Query query = parseContext.parseInnerQuery();
                    if (!(query instanceof SpanQuery)) {
                        throw new QueryParsingException(parseContext.index(), "spanNot [exclude] must be of type span query");
                    }
                    exclude = (SpanQuery) query;
                } else {
                    throw new QueryParsingException(parseContext.index(), "[span_not] query does not support [" + currentFieldName + "]");
                }
            } else {
                if ("boost".equals(currentFieldName)) {
                    boost = parser.floatValue();
                } else if ("_name".equals(currentFieldName)) {
                    queryName = parser.text();
                } else {
                    throw new QueryParsingException(parseContext.index(), "[span_not] query does not support [" + currentFieldName + "]");
                }
            }
        }
        if (include == null) {
            throw new QueryParsingException(parseContext.index(), "spanNot must have [include] span query clause");
        }
        if (exclude == null) {
            throw new QueryParsingException(parseContext.index(), "spanNot must have [exclude] span query clause");
        }

        SpanNotQuery query = new SpanNotQuery(include, exclude);
        query.setBoost(boost);
        if (queryName != null) {
            parseContext.addNamedQuery(queryName, query);
        }
        return query;
    }
}
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