CATROID-1551 REFACTOR SetVariableAction to Kotlin

Converted the java file SetVariableAction.java to Kotlin.

catroid/src/main/java/org/catrobat/catroid/content/actions/SetVariableAction.kt

@@ -0,0 +1,91 @@
+/*
+ * Catroid: An on-device visual programming system for Android devices
+ * Copyright (C) 2010-2022 The Catrobat Team
+ * (<http://developer.catrobat.org/credits>)
+ *
+ * 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.
+ *
+ * An additional term exception under section 7 of the GNU Affero
+ * General Public License, version 3, is available at
+ * http://developer.catrobat.org/license_additional_term
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+package org.catrobat.catroid.content.actions
+
+import android.util.Log
+import com.badlogic.gdx.scenes.scene2d.actions.TemporalAction
+import org.catrobat.catroid.ProjectManager
+import org.catrobat.catroid.bluetooth.base.BluetoothDevice
+import org.catrobat.catroid.common.CatroidService
+import org.catrobat.catroid.common.Constants
+import org.catrobat.catroid.common.ServiceProvider
+import org.catrobat.catroid.content.Scope
+import org.catrobat.catroid.devices.multiplayer.MultiplayerInterface
+import org.catrobat.catroid.formulaeditor.Formula
+import org.catrobat.catroid.formulaeditor.FormulaElement
+import org.catrobat.catroid.formulaeditor.UserVariable
+import org.catrobat.catroid.formulaeditor.common.Conversions.convertArgumentToDouble
+
+class SetVariableAction : TemporalAction() {
+    private var scope: Scope? = null
+    private var changeVariable: Formula? = null
+    private var userVariable: UserVariable? = null
+    override fun update(percent: Float) {
+        if (userVariable == null) {
+            return
+        }
+
+        var value = changeVariable?.interpretObject(scope) ?: java.lang.Double.valueOf(0.0)
+        if (changeVariable != null && changeVariable?.root?.isBoolean(scope) == true) {
+            value = value as Double != 0.0
+        }
+
+        val isFirstLevelStringTree = changeVariable != null &&
+            changeVariable?.root?.elementType == FormulaElement.ElementType.STRING
+        val isConvertible = !isFirstLevelStringTree &&
+            userVariable.hashCode() != Constants.TEXT_FROM_CAMERA_SENSOR_HASHCODE &&
+            checkValueForDoubleConversion(value)
+        try {
+            value = if (isConvertible) convertArgumentToDouble(value) else value
+        } catch (numberFormatException: NumberFormatException) {
+            Log.d(javaClass.simpleName, "Couldn't parse String", numberFormatException)
+        }
+
+        userVariable?.value = value
+        handleMultiplayerVariable()
+    }
+
+    val multiplayerDevice: MultiplayerInterface?
+        get() = ServiceProvider.getService(CatroidService.BLUETOOTH_DEVICE_SERVICE).getDevice(
+            BluetoothDevice.MULTIPLAYER
+        )
+
+    private fun handleMultiplayerVariable() {
+        ProjectManager.getInstance().currentProject.getMultiplayerVariable(userVariable?.name) ?: return
+        multiplayerDevice?.sendChangedMultiplayerVariables(userVariable)
+    }
+    private fun checkValueForDoubleConversion(value: Any?): Boolean =
+        value is String && convertArgumentToDouble(value) != null
+
+    fun setUserVariable(userVariable: UserVariable?) {
+        this.userVariable = userVariable ?: return
+    }
+
+    fun setChangeVariable(changeVariable: Formula?) {
+        this.changeVariable = changeVariable
+    }
+
+    fun setScope(scope: Scope?) {
+        this.scope = scope
+    }
+}