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package com.google.refine.browsing.facets;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

import com.google.refine.model.Project;

/**
 * Represents the configuration of a facet, as stored in the engine configuration and in the JSON serialization of
 * operations. It does not contain the actual values displayed by the facet.
 * 
 * @author Antonin Delpeuch
 *
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
@JsonSubTypes({
        @Type(value = ListFacet.ListFacetConfig.class, name = "list"),
        @Type(value = RangeFacet.RangeFacetConfig.class, name = "range"),
        @Type(value = TimeRangeFacet.TimeRangeFacetConfig.class, name = "timerange"),
        @Type(value = TextSearchFacet.TextSearchFacetConfig.class, name = "text"),
        @Type(value = ScatterplotFacet.ScatterplotFacetConfig.class, name = "scatterplot") })
public interface FacetConfig {

    /**
     * Instantiates the given facet on a particular project.
     * 
     * @param project
     * @return a computed facet on the given project.
     */
    public Facet apply(Project project);

    /**
     * The facet type as stored in json.
     */
    @JsonIgnore // already included by @JsonTypeInfo
    public String getJsonType();
}