Filter.kt 2.36 KB
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/*
 * search-doc-service
 * Copyright (C) 2020 Memoriav
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package org.memobase.helpers

import com.beust.klaxon.JsonArray
import com.beust.klaxon.JsonObject
import org.apache.logging.log4j.LogManager

object Filter {
    private val log = LogManager.getLogger("SearchDocFilter")

    /**
     *
     *
     * @param sourceProperty
     * @param sourceResource
     * @param fullGraph
     * @return The list of de-referenced JSON Objects.
     */
    fun entitiesByProperty(sourceProperty: String, sourceResource: JsonObject?, fullGraph: Map<String, JsonObject>): List<JsonObject> {
        if (sourceResource == null) {
            log.info("No results collected from property $sourceProperty, because resource does not exist.")
            return emptyList()
        }
        return sourceResource[sourceProperty].let {
            when (it) {
                is String -> listOf(fullGraph[it] as JsonObject)
                is JsonObject -> listOf(fullGraph[it["@id"]] as JsonObject)
                is JsonArray<*> ->
                    it.mapNotNull { child ->
                        when (child) {
                            is String -> fullGraph[child]
                            is JsonObject -> fullGraph[child["@id"]]
                            else -> null
                        }
                    }
                null -> {
                    log.info("Property $sourceProperty is not defined in resource ${sourceResource["@id"]}.")
                    emptyList()
                }
                else -> {
                    log.error("Unexpected JSON structure for property $sourceProperty in resource ${sourceResource["@id"]}.")
                    emptyList()
                }
            }
        }
    }
}