Migrate class AbstractDataTest to Kotlin.

src/test/java/de/mrapp/apriori/AbstractDataTest.kt

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2017 - 2018 Michael Rapp
+ *
+ * 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 de.mrapp.apriori
+
+import de.mrapp.util.Condition.ensureNotEmpty
+import org.junit.Assert.assertTrue
+import java.io.File
+import java.net.URISyntaxException
+import java.nio.file.Paths
+
+/**
+ * An abstract base class for all tests, which rely on reading data from text files.
+ *
+ * @author Michael Rapp
+ */
+abstract class AbstractDataTest {
+
+    companion object {
+
+        const val INPUT_FILE_1 = "data1.txt"
+
+        const val INPUT_FILE_2 = "data2.txt"
+
+        const val INPUT_FILE_3 = "data3.txt"
+
+        const val INPUT_FILE_4 = "data4.txt"
+
+        val FREQUENT_ITEM_SETS_1 = arrayOf(arrayOf("milk", "sugar"), arrayOf("coffee"), arrayOf("coffee", "milk", "sugar"), arrayOf("coffee", "sugar"), arrayOf("milk"), arrayOf("coffee", "milk"), arrayOf("bread"), arrayOf("bread", "sugar"), arrayOf("sugar"))
+
+        val SUPPORTS_1 = doubleArrayOf(0.5, 0.75, 0.5, 0.5, 0.75, 0.75, 0.5, 0.5, 0.75)
+
+        val FREQUENT_ITEM_SETS_2 = arrayOf(arrayOf("beer"), arrayOf("wine"), arrayOf("beer", "wine"), arrayOf("chips", "pizza"), arrayOf("beer", "chips", "wine"), arrayOf("chips"), arrayOf("beer", "chips"), arrayOf("chips", "wine"), arrayOf("pizza"), arrayOf("pizza", "wine"))
+
+        val SUPPORTS_2 = doubleArrayOf(0.5, 0.5, 0.25, 0.25, 0.25, 0.75, 0.5, 0.25, 0.5, 0.25)
+
+        val FREQUENT_ITEM_SETS_3 = arrayOf(arrayOf("0", "3"), arrayOf("0", "1", "3"), arrayOf("3"), arrayOf("0", "4"), arrayOf("0", "1", "4"), arrayOf("4"), arrayOf("1", "4"), arrayOf("0"), arrayOf("0", "1"), arrayOf("1"))
+
+        val SUPPORTS_3 = doubleArrayOf(0.5, 0.5, 0.5, 0.75, 0.75, 0.75, 0.75, 1.0, 1.0, 1.0)
+
+        val FREQUENT_ITEM_SETS_4 = arrayOf(arrayOf("0", "3"), arrayOf("0", "1", "3"), arrayOf("3"), arrayOf("0", "4"), arrayOf("0", "1", "4"), arrayOf("4"), arrayOf("1", "4"), arrayOf("0"), arrayOf("0", "1"), arrayOf("1"))
+
+        val SUPPORTS_4 = doubleArrayOf(0.6, 0.6, 0.6, 0.6, 0.6, 0.6, 0.6, 1.0, 1.0, 1.0)
+
+    }
+
+    protected fun getInputFile(fileName: String): File {
+        ensureNotEmpty(fileName, "The file name may not be null")
+
+        try {
+            val url = javaClass.classLoader.getResource(fileName)
+
+            if (url != null) {
+                val file = Paths.get(url.toURI()).toFile()
+                assertTrue(file.isFile)
+                return file
+            }
+
+            throw RuntimeException("Failed to retrieve path of input file")
+        } catch (e: URISyntaxException) {
+            throw RuntimeException("Failed to read input file", e)
+        }
+
+    }
+
+}