refactor RuleVariable to kotlin

src/main/java/org/hisp/dhis/rules/models/RuleVariable.kt

@@ -0,0 +1,25 @@
+package org.hisp.dhis.rules.models
+
+import org.hisp.dhis.rules.Option
+import org.hisp.dhis.rules.RuleVariableValue
+import org.hisp.dhis.rules.RuleVariableValueMapBuilder
+import java.util.function.Predicate
+import javax.annotation.Nonnull
+
+interface RuleVariable {
+    fun options(): List<Option>
+    fun createValues(
+        builder: RuleVariableValueMapBuilder,
+        allEventValues: Map<String, List<RuleDataValue>>,
+        currentEnrollmentValues: Map<String, RuleAttributeValue>,
+        currentEventValues: Map<String, RuleDataValue>
+    ): Map<String, RuleVariableValue>
+
+    fun getOptionName(value: String?): String? {
+        // if no option found then existing value in the context will be used
+        return options()
+            .filter{ (_, code): Option -> value == code }
+            .map(Option::name)
+            .getOrElse(0) {_ -> value}
+    }
+}

src/main/java/org/hisp/dhis/rules/models/RuleVariableAttribute.kt

@@ -0,0 +1,43 @@
+package org.hisp.dhis.rules.models
+
+import org.hisp.dhis.rules.Option
+import org.hisp.dhis.rules.RuleVariableValue
+import org.hisp.dhis.rules.RuleVariableValueMapBuilder
+import org.hisp.dhis.rules.dateFormat
+import java.util.*
+import javax.annotation.Nonnull
+
+data class RuleVariableAttribute(
+    val name: String,
+    val useCodeForOptionSet: Boolean,
+    val options: List<Option>,
+    val trackedEntityAttribute: String,
+    val trackedEntityAttributeType: RuleValueType
+) : RuleVariable {
+    override fun options(): List<Option> {
+        return options
+    }
+
+    override fun createValues(
+        builder: RuleVariableValueMapBuilder,
+        allEventValues: Map<String, List<RuleDataValue>>,
+        currentEnrollmentValues: Map<String, RuleAttributeValue>,
+        currentEventValues: Map<String, RuleDataValue>
+    ): Map<String, RuleVariableValue> {
+        val valueMap: MutableMap<String, RuleVariableValue> = HashMap()
+        val currentDate = dateFormat.format(Date())
+        val variableValue: RuleVariableValue
+        variableValue = if (currentEnrollmentValues.containsKey(trackedEntityAttribute)) {
+            val value = currentEnrollmentValues[trackedEntityAttribute]
+            val optionValue = if (useCodeForOptionSet) value!!.value else getOptionName(value!!.value)!!
+            RuleVariableValue.create(
+                optionValue, trackedEntityAttributeType,
+                java.util.List.of(optionValue), currentDate
+            )
+        } else {
+            RuleVariableValue.create(trackedEntityAttributeType)
+        }
+        valueMap[name] = variableValue
+        return valueMap
+    }
+}

src/main/java/org/hisp/dhis/rules/models/RuleVariableCalculatedValue.kt

@@ -0,0 +1,56 @@
+package org.hisp.dhis.rules.models
+
+import org.hisp.dhis.rules.*
+import javax.annotation.Nonnull
+
+/*
+* Copyright (c) 2004-2018, University of Oslo
+* All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+* Redistributions of source code must retain the above copyright notice, this
+* list of conditions and the following disclaimer.
+*
+* Redistributions in binary form must reproduce the above copyright notice,
+* this list of conditions and the following disclaimer in the documentation
+* and/or other materials provided with the distribution.
+* Neither the name of the HISP project nor the names of its contributors may
+* be used to endorse or promote products derived from this software without
+* specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/ /**
+ * @author Zubair Asghar.
+ */
+class RuleVariableCalculatedValue(
+    val name: String,
+    val useCodeForOptionSet: Boolean,
+    val options: List<Option>,
+    val calculatedValueVariable: String,
+    val calculatedValueType: RuleValueType
+) : RuleVariable {
+    override fun options(): List<Option> {
+        return options
+    }
+
+    override fun createValues(
+        builder: RuleVariableValueMapBuilder,
+        allEventValues: Map<String, List<RuleDataValue>>,
+        currentEnrollmentValues: Map<String, RuleAttributeValue>,
+        currentEventValues: Map<String, RuleDataValue>
+    ): Map<String, RuleVariableValue> {
+        val valueMap: MutableMap<String, RuleVariableValue> = HashMap()
+        valueMap[name] = RuleVariableValue.create(calculatedValueType)
+        return valueMap
+    }
+}

src/main/java/org/hisp/dhis/rules/models/RuleVariableCurrentEvent.kt

@@ -0,0 +1,46 @@
+package org.hisp.dhis.rules.models
+
+import org.hisp.dhis.rules.*
+import javax.annotation.Nonnull
+
+class RuleVariableCurrentEvent(
+    val name: String,
+    val useCodeForOptionSet: Boolean,
+    val options: List<Option>,
+    val dataElement: String,
+    val dataElementType: RuleValueType
+) : RuleVariableDataElement {
+    override fun dataElement(): String {
+        return dataElement
+    }
+
+    override fun dataElementType(): RuleValueType {
+        return dataElementType
+    }
+
+    override fun options(): List<Option> {
+        return options
+    }
+
+    override fun createValues(
+        builder: RuleVariableValueMapBuilder,
+        allEventValues: Map<String, List<RuleDataValue>>,
+        currentEnrollmentValues: Map<String, RuleAttributeValue>,
+        currentEventValues: Map<String, RuleDataValue>
+    ): Map<String, RuleVariableValue> {
+        val valueMap: MutableMap<String, RuleVariableValue> = HashMap()
+        val variableValue: RuleVariableValue
+        variableValue = if (currentEventValues.containsKey(dataElement)) {
+            val value = currentEventValues[dataElement]
+            val optionValue = if (useCodeForOptionSet) value!!.value else getOptionName(value!!.value)!!
+            RuleVariableValue.create(
+                optionValue, dataElementType,
+                java.util.List.of(optionValue), getLastUpdateDate(java.util.List.of(value))
+            )
+        } else {
+            RuleVariableValue.create(dataElementType)
+        }
+        valueMap[name] = variableValue
+        return valueMap
+    }
+}