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Percolator module adds capability to index queries and query these queries by specifying documents
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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,
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package org.elasticsearch.percolator;

import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.IndexScopedSettings;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.SettingsFilter;
import org.elasticsearch.index.mapper.Mapper;
import org.elasticsearch.plugins.ActionPlugin;
import org.elasticsearch.plugins.MapperPlugin;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.plugins.SearchPlugin;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestHandler;
import org.elasticsearch.search.fetch.FetchSubPhase;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

import static java.util.Collections.singletonList;

public class PercolatorPlugin extends Plugin implements MapperPlugin, ActionPlugin, SearchPlugin {

    private final Settings settings;

    public PercolatorPlugin(Settings settings) {
        this.settings = settings;
    }

    @Override
    public List> getActions() {
        return Arrays.asList(new ActionHandler<>(PercolateAction.INSTANCE, TransportPercolateAction.class),
                new ActionHandler<>(MultiPercolateAction.INSTANCE, TransportMultiPercolateAction.class));
    }

    @Override
    public List getRestHandlers(Settings settings, RestController restController, ClusterSettings clusterSettings,
            IndexScopedSettings indexScopedSettings, SettingsFilter settingsFilter, IndexNameExpressionResolver indexNameExpressionResolver,
            Supplier nodesInCluster) {
        return Arrays.asList(
                new RestPercolateAction(settings, restController),
                new RestMultiPercolateAction(settings, restController));
    }

    @Override
    public List> getQueries() {
        return singletonList(new QuerySpec<>(PercolateQueryBuilder.NAME, PercolateQueryBuilder::new, PercolateQueryBuilder::fromXContent));
    }

    @Override
    public List getFetchSubPhases(FetchPhaseConstructionContext context) {
        return singletonList(new PercolatorHighlightSubFetchPhase(settings, context.getHighlighters()));
    }

    @Override
    public List> getSettings() {
        return Collections.singletonList(PercolatorFieldMapper.INDEX_MAP_UNMAPPED_FIELDS_AS_STRING_SETTING);
    }

    @Override
    public Map getMappers() {
        return Collections.singletonMap(PercolatorFieldMapper.CONTENT_TYPE, new PercolatorFieldMapper.TypeParser());
    }

}