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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.internal;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.common.CheckedFunction;
import org.elasticsearch.common.Strings;
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.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryRewriteContext;
import java.io.IOException;
import java.util.Arrays;
import java.util.Objects;
/**
* Represents a {@link QueryBuilder} and a list of alias names that filters the builder is composed of.
*/
public final class AliasFilter implements Writeable {
private final String[] aliases;
private final QueryBuilder filter;
private final boolean reparseAliases;
public static final AliasFilter EMPTY = new AliasFilter(null, Strings.EMPTY_ARRAY);
public AliasFilter(QueryBuilder filter, String... aliases) {
this.aliases = aliases == null ? Strings.EMPTY_ARRAY : aliases;
this.filter = filter;
reparseAliases = false; // no bwc here - we only do this if we parse the filter
}
public AliasFilter(StreamInput input) throws IOException {
aliases = input.readStringArray();
if (input.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
filter = input.readOptionalNamedWriteable(QueryBuilder.class);
reparseAliases = false;
} else {
reparseAliases = true; // alright we read from 5.0
filter = null;
}
}
private QueryBuilder reparseFilter(QueryRewriteContext context) {
if (reparseAliases) {
// we are processing a filter received from a 5.0 node - we need to reparse this on the executing node
final IndexMetaData indexMetaData = context.getIndexSettings().getIndexMetaData();
/* Being static, parseAliasFilter doesn't have access to whatever guts it needs to parse a query. Instead of passing in a bunch
* of dependencies we pass in a function that can perform the parsing. */
CheckedFunction<byte[], QueryBuilder, IOException> filterParser = bytes -> {
try (XContentParser parser = XContentFactory.xContent(bytes).createParser(context.getXContentRegistry(), bytes)) {
return context.newParseContext(parser).parseInnerQueryBuilder();
}
};
return ShardSearchRequest.parseAliasFilter(filterParser, indexMetaData, aliases);
}
return filter;
}
AliasFilter rewrite(QueryRewriteContext context) throws IOException {
QueryBuilder queryBuilder = reparseFilter(context);
if (queryBuilder != null) {
return new AliasFilter(QueryBuilder.rewriteQuery(queryBuilder, context), aliases);
}
return new AliasFilter(filter, aliases);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeStringArray(aliases);
if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
out.writeOptionalNamedWriteable(filter);
}
}
/**
* Returns the aliases patters that are used to compose the {@link QueryBuilder}
* returned from {@link #getQueryBuilder()}
*/
public String[] getAliases() {
return aliases;
}
/**
* Returns the alias filter {@link QueryBuilder} or <code>null</code> if there is no such filter
*/
public QueryBuilder getQueryBuilder() {
if (reparseAliases) {
// this is only for BWC since 5.0 still only sends aliases so this must be rewritten on the executing node
// if we talk to an older node we also only forward/write the string array which is compatible with the consumers
// in 5.0 see ExplainRequest and QueryValidationRequest
throw new IllegalStateException("alias filter for aliases: " + Arrays.toString(aliases) + " must be rewritten first");
}
return filter;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
AliasFilter that = (AliasFilter) o;
return reparseAliases == that.reparseAliases &&
Arrays.equals(aliases, that.aliases) &&
Objects.equals(filter, that.filter);
}
@Override
public int hashCode() {
return Objects.hash(reparseAliases, Arrays.hashCode(aliases), filter);
}
@Override
public String toString() {
return "AliasFilter{" +
"aliases=" + Arrays.toString(aliases) +
", filter=" + filter +
", reparseAliases=" + reparseAliases +
'}';
}
}
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