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117 changes: 117 additions & 0 deletions
117
...e-query/src/main/kotlin/org/vitrivr/engine/query/operators/transform/filter/LateFilter.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package org.vitrivr.engine.query.operators.transform.filter | ||
|
|
||
| import io.github.oshai.kotlinlogging.KLogger | ||
| import io.github.oshai.kotlinlogging.KotlinLogging | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.flow | ||
| import kotlinx.coroutines.flow.toList | ||
| import org.vitrivr.engine.core.model.metamodel.Schema | ||
| import org.vitrivr.engine.core.model.query.basics.ComparisonOperator | ||
| import org.vitrivr.engine.core.model.query.basics.ComparisonOperator.* | ||
| import org.vitrivr.engine.core.model.retrievable.Retrievable | ||
| import org.vitrivr.engine.core.model.retrievable.Retrieved | ||
| import org.vitrivr.engine.core.model.types.Value | ||
| import org.vitrivr.engine.core.operators.Operator | ||
| import org.vitrivr.engine.core.operators.general.Transformer | ||
| import java.sql.Date | ||
| import javax.management.Descriptor | ||
|
|
||
| /** | ||
| * Appends [Descriptor] to a [Retrieved] based on the values of a [Schema.Field], if available. | ||
| * | ||
| * @version 1.1.2 | ||
| * @author Luca Rossetto | ||
| * @author Ralph Gasser | ||
| */ | ||
| class LateFilter( | ||
| override val input: Operator<out Retrievable>, | ||
| /* The reader for a given field. */ | ||
| private val fieldName: String, | ||
| /* keys to filter on */ | ||
| val keys: List<String>, | ||
| /* boolean operator*/ | ||
| val comparison: ComparisonOperator = EQ, | ||
| /* value to compare to */ | ||
| val value: String, | ||
| /* appends late filter */ | ||
| val limit: Int = Int.MAX_VALUE, | ||
| /* on missing key skip */ | ||
| val skip: Skip = Skip.valueOf("ignore"), | ||
|
|
||
| override val name: String | ||
| ) : Transformer { | ||
| private val logger: KLogger = KotlinLogging.logger {} | ||
|
|
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| override fun toFlow(scope: CoroutineScope): Flow<Retrievable> = flow { | ||
| /* Parse input IDs.*/ | ||
| val inputRetrieved = input.toFlow(scope).toList() | ||
|
|
||
| // Multi keys for | ||
| if (keys.size > 1) | ||
| throw IllegalArgumentException("only one key is supported yet") | ||
|
|
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| var emitted = 0 | ||
| /* Emit retrievable with added attribute. */ | ||
| inputRetrieved.forEach { retrieved -> | ||
|
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| val descriptors = retrieved.findDescriptor { it.field?.fieldName == fieldName } | ||
| if (descriptors.isEmpty() || descriptors.first().values().containsKey(keys[0]).not()) { | ||
| when (skip) { | ||
| Skip.ERROR -> throw IllegalArgumentException("no descriptor found for field $fieldName") | ||
| Skip.WARN -> logger.warn { "no descriptor found for field $fieldName" } | ||
| Skip.IGNORE -> return@forEach | ||
| Skip.FORWARD -> emit(retrieved) | ||
| } | ||
| } | ||
|
|
||
| val values = descriptors.first().values().toMap() | ||
| val attribute = keys.map { | ||
| (when (values[it]) { | ||
| is Value.String -> Pair(it to (values[it] as Value.String), Value.of(value.toString())) | ||
| is Value.Boolean -> Pair(it to (values[it] as Value.Boolean), Value.of(value.toBoolean())) | ||
| is Value.Int -> Pair(it to (values[it] as Value.Int), Value.of(value.toInt())) | ||
| is Value.Long -> Pair(it to (values[it] as Value.Long), Value.of(value.toLong())) | ||
| is Value.Float -> Pair(it to (values[it] as Value.Float), Value.of(value.toFloat())) | ||
| is Value.Double -> Pair(it to (values[it] as Value.Double), Value.of(value.toDouble())) | ||
| is Value.Byte -> Pair(it to (values[it] as Value.Byte), Value.of(value.toByte())) | ||
| is Value.Short -> Pair(it to (values[it] as Value.Short), Value.of(value.toShort())) | ||
| is Value.DateTime -> Pair(it to (values[it] as Value.DateTime), Value.of(Date.valueOf(value))) | ||
| else -> Pair(it to null, null) | ||
| }) | ||
| } | ||
|
|
||
| attribute[0].takeIf { it.first.second != null && it.second != null }?.let { | ||
| it.takeIf { ++emitted <= limit && comparison.compare(it.first.second!!, it.second!!) }?.let { | ||
| emit(retrieved) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| enum class Skip(val strategy: String) { | ||
| ERROR("error"), | ||
| WARN("warn"), | ||
| IGNORE("ignore"), | ||
| FORWARD("forward"); | ||
|
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| companion object { | ||
| /** | ||
| * Resolves a [ComparisonOperator] from the given [String]. | ||
| * | ||
| * @param str The [String] which should be one of the [ComparisonOperator] | ||
| * @throws IllegalArgumentException In case the given string is not one of the defined ones. | ||
| */ | ||
| infix fun fromString(str: String): Skip { | ||
| return when (str.trim()) { | ||
| ERROR.strategy -> ERROR | ||
| WARN.strategy -> WARN | ||
| IGNORE.strategy -> IGNORE | ||
| FORWARD.strategy -> FORWARD | ||
| else -> throw IllegalArgumentException("Cannot parse '$str") | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
29 changes: 29 additions & 0 deletions
29
.../src/main/kotlin/org/vitrivr/engine/query/operators/transform/filter/LateFilterFactory.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package org.vitrivr.engine.query.operators.transform.filter | ||
|
|
||
| import org.vitrivr.engine.core.context.Context | ||
| import org.vitrivr.engine.core.context.QueryContext | ||
| import org.vitrivr.engine.core.model.query.basics.ComparisonOperator | ||
| import org.vitrivr.engine.core.model.retrievable.Retrievable | ||
| import org.vitrivr.engine.core.operators.Operator | ||
| import org.vitrivr.engine.core.operators.general.TransformerFactory | ||
|
|
||
| class LateFilterFactory() : TransformerFactory { | ||
| override fun newTransformer(name: String, input: Operator<out Retrievable>, context: Context): LateFilter { | ||
| require(context is QueryContext) | ||
| val field = | ||
| context[name, "field"] ?: throw IllegalArgumentException("expected 'field' to be defined in properties") | ||
| val comparison = context[name, "comparison"] | ||
| ?: throw IllegalArgumentException("expected 'comparison' to be defined in properties") | ||
| val value = | ||
| context[name, "value"] ?: throw IllegalArgumentException("expected 'value' to be defined in properties") | ||
| val skip = context[name, "skip"].toString() | ||
| val limit = context[name, "limit"]?.toInt() ?: Int.MAX_VALUE | ||
| val providedKeys = context[name, "keys"] | ||
| val keys = if (providedKeys?.isNotBlank() == true) { | ||
| providedKeys.split(",").map { s -> s.trim() } | ||
| } else { | ||
| emptyList() | ||
| } | ||
| return LateFilter(input, field, keys, ComparisonOperator.fromString(comparison), value, limit, Skip.fromString(skip), name) | ||
| } | ||
| } |
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