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Issue Qbeast-io#224: Handling single-value appends (Qbeast-io#462)
* Deprecate NullToZero and IdentityToZero Transformations, add IdentityTransformations, add tests
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core/src/main/scala/io/qbeast/core/transform/IdentityTransformation.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| /* | ||
| * Copyright 2021 Qbeast Analytics, S.L. | ||
| * | ||
| * Licensed 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 io.qbeast.core.transform | ||
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| import com.fasterxml.jackson.core.JsonGenerator | ||
| import com.fasterxml.jackson.core.JsonParser | ||
| import com.fasterxml.jackson.core.TreeNode | ||
| import com.fasterxml.jackson.databind.annotation.JsonDeserialize | ||
| import com.fasterxml.jackson.databind.annotation.JsonSerialize | ||
| import com.fasterxml.jackson.databind.deser.std.StdDeserializer | ||
| import com.fasterxml.jackson.databind.jsontype.TypeSerializer | ||
| import com.fasterxml.jackson.databind.node.DoubleNode | ||
| import com.fasterxml.jackson.databind.node.IntNode | ||
| import com.fasterxml.jackson.databind.node.NullNode | ||
| import com.fasterxml.jackson.databind.node.NumericNode | ||
| import com.fasterxml.jackson.databind.node.TextNode | ||
| import com.fasterxml.jackson.databind.ser.std.StdSerializer | ||
| import com.fasterxml.jackson.databind.DeserializationContext | ||
| import com.fasterxml.jackson.databind.SerializerProvider | ||
| import io.qbeast.core.model._ | ||
|
|
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| @JsonSerialize(using = classOf[IdentityTransformationSerializer]) | ||
| @JsonDeserialize(using = classOf[IdentityTransformationDeserializer]) | ||
| case class IdentityTransformation(identityValue: Any, orderedDataType: OrderedDataType) | ||
| extends Transformation { | ||
|
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| import orderedDataType.ordering._ | ||
|
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| override def transform(value: Any): Double = 0.0 | ||
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| override def isSupersededBy(newTransformation: Transformation): Boolean = | ||
| newTransformation match { | ||
| case IdentityTransformation(newIdValue, newType) if newType == orderedDataType => | ||
| if (newIdValue == null) false | ||
| else if (identityValue == null) true | ||
| else newIdValue != identityValue | ||
| case _: LinearTransformation => true | ||
| case _ => false | ||
| } | ||
|
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| override def merge(other: Transformation): Transformation = other match { | ||
| case linear @ LinearTransformation(min, max, _, newType) if newType == orderedDataType => | ||
| if (identityValue == null || (lteq(min, identityValue) && gteq(max, identityValue))) linear | ||
| else { | ||
| val minValue = min.min(identityValue) | ||
| val maxValue = max.max(identityValue) | ||
| LinearTransformation(minValue, maxValue, orderedDataType) | ||
| } | ||
| case identity @ IdentityTransformation(newIdValue, newType) if newType == orderedDataType => | ||
| if (newIdValue == null) this | ||
| else if (identityValue == null) identity | ||
| else if (identityValue == newIdValue) this | ||
| else { | ||
| val minValue = identityValue.min(newIdValue) | ||
| val maxValue = identityValue.max(newIdValue) | ||
| LinearTransformation(minValue, maxValue, orderedDataType) | ||
| } | ||
| } | ||
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| } | ||
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| class IdentityTransformationSerializer | ||
| extends StdSerializer[IdentityTransformation](classOf[IdentityTransformation]) { | ||
|
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| override def serializeWithType( | ||
| value: IdentityTransformation, | ||
| gen: JsonGenerator, | ||
| serializers: SerializerProvider, | ||
| typeSer: TypeSerializer): Unit = { | ||
| gen.writeStartObject() | ||
| typeSer.getPropertyName | ||
| gen.writeStringField(typeSer.getPropertyName, typeSer.getTypeIdResolver.idFromValue(value)) | ||
| value.identityValue match { | ||
| case v: Double => gen.writeNumberField("identityValue", v) | ||
| case v: Long => gen.writeNumberField("identityValue", v) | ||
| case v: Int => gen.writeNumberField("identityValue", v) | ||
| case v: Float => gen.writeNumberField("identityValue", v) | ||
| case null => gen.writeNullField("identityValue") | ||
| } | ||
| gen.writeObjectField("orderedDataType", value.orderedDataType) | ||
| gen.writeEndObject() | ||
| } | ||
|
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| override def serialize( | ||
| value: IdentityTransformation, | ||
| gen: JsonGenerator, | ||
| serializers: SerializerProvider): Unit = { | ||
| gen.writeStartObject() | ||
| value.identityValue match { | ||
| case v: Double => gen.writeNumberField("identityValue", v) | ||
| case v: Long => gen.writeNumberField("identityValue", v) | ||
| case v: Int => gen.writeNumberField("identityValue", v) | ||
| case v: Float => gen.writeNumberField("identityValue", v) | ||
| } | ||
| gen.writeObjectField("orderedDataType", value.orderedDataType) | ||
| gen.writeEndObject() | ||
| } | ||
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| } | ||
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| class IdentityTransformationDeserializer | ||
| extends StdDeserializer[IdentityTransformation](classOf[IdentityTransformation]) { | ||
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| private def getTypedValue(odt: OrderedDataType, tree: TreeNode): Any = { | ||
| (odt, tree) match { | ||
| case (IntegerDataType, int: IntNode) => int.asInt | ||
| case (DoubleDataType, double: DoubleNode) => double.asDouble | ||
| case (LongDataType, long: NumericNode) => long.asLong | ||
| case (FloatDataType, float: DoubleNode) => float.floatValue | ||
| case (DecimalDataType, decimal: DoubleNode) => decimal.asDouble | ||
| case (TimestampDataType, timestamp: NumericNode) => timestamp.asLong | ||
| case (DateDataType, date: NumericNode) => date.asLong | ||
| case (_, _: NullNode) => null | ||
| case (_, null) => null | ||
| case (a, b) => | ||
| throw new IllegalArgumentException(s"Invalid data type ($a,$b) ${b.getClass} ") | ||
| } | ||
|
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| } | ||
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| override def deserialize( | ||
| p: JsonParser, | ||
| ctxt: DeserializationContext): IdentityTransformation = { | ||
| val tree: TreeNode = p.getCodec.readTree(p) | ||
| val odt = tree.get("orderedDataType") match { | ||
| case tn: TextNode => OrderedDataType(tn.asText()) | ||
| } | ||
| val identityValue = getTypedValue(odt, tree.get("identityValue")) | ||
| IdentityTransformation(identityValue, odt) | ||
| } | ||
|
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| } |
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