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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.Filter;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
/**
*/
public class IndicesFilterParser implements FilterParser {
public static final String NAME = "indices";
@Nullable
private final ClusterService clusterService;
@Inject
public IndicesFilterParser(@Nullable ClusterService clusterService) {
this.clusterService = clusterService;
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Filter filter = null;
Filter noMatchFilter = Queries.MATCH_ALL_FILTER;
boolean filterFound = false;
boolean indicesFound = false;
boolean currentIndexMatchesIndices = false;
String filterName = 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 ("filter".equals(currentFieldName)) {
filterFound = true;
//TODO We are able to decide whether to parse the filter or not only if indices in the query appears first
if (indicesFound && !currentIndexMatchesIndices) {
parseContext.parser().skipChildren(); // skip the filter object without parsing it
} else {
filter = parseContext.parseInnerFilter();
}
} else if ("no_match_filter".equals(currentFieldName)) {
if (indicesFound && currentIndexMatchesIndices) {
parseContext.parser().skipChildren(); // skip the filter object without parsing it
} else {
noMatchFilter = parseContext.parseInnerFilter();
}
} else {
throw new QueryParsingException(parseContext.index(), "[indices] filter does not support [" + currentFieldName + "]");
}
} else if (token == XContentParser.Token.START_ARRAY) {
if ("indices".equals(currentFieldName)) {
if (indicesFound) {
throw new QueryParsingException(parseContext.index(), "[indices] indices or index already specified");
}
indicesFound = true;
Collection<String> indices = new ArrayList<>();
while (parser.nextToken() != XContentParser.Token.END_ARRAY) {
String value = parser.textOrNull();
if (value == null) {
throw new QueryParsingException(parseContext.index(), "[indices] no value specified for 'indices' entry");
}
indices.add(value);
}
currentIndexMatchesIndices = matchesIndices(parseContext.index().name(), indices.toArray(new String[indices.size()]));
} else {
throw new QueryParsingException(parseContext.index(), "[indices] filter does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("index".equals(currentFieldName)) {
if (indicesFound) {
throw new QueryParsingException(parseContext.index(), "[indices] indices or index already specified");
}
indicesFound = true;
currentIndexMatchesIndices = matchesIndices(parseContext.index().name(), parser.text());
} else if ("no_match_filter".equals(currentFieldName)) {
String type = parser.text();
if ("all".equals(type)) {
noMatchFilter = Queries.MATCH_ALL_FILTER;
} else if ("none".equals(type)) {
noMatchFilter = Queries.MATCH_NO_FILTER;
}
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[indices] filter does not support [" + currentFieldName + "]");
}
}
}
if (!filterFound) {
throw new QueryParsingException(parseContext.index(), "[indices] requires 'filter' element");
}
if (!indicesFound) {
throw new QueryParsingException(parseContext.index(), "[indices] requires 'indices' or 'index' element");
}
Filter chosenFilter;
if (currentIndexMatchesIndices) {
chosenFilter = filter;
} else {
chosenFilter = noMatchFilter;
}
if (filterName != null) {
parseContext.addNamedFilter(filterName, chosenFilter);
}
return chosenFilter;
}
protected boolean matchesIndices(String currentIndex, String... indices) {
final String[] concreteIndices = clusterService.state().metaData().concreteIndices(IndicesOptions.lenientExpandOpen(), indices);
for (String index : concreteIndices) {
if (Regex.simpleMatch(index, currentIndex)) {
return true;
}
}
return false;
}
}