Input | Added Input Reader & Day Value Object

Author: TomPlum

src/main/kotlin/io/github/tomplum/libs/input/Day.kt

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+package io.github.tomplum.libs.input
+
+class Day(val value: Int)

src/main/kotlin/io/github/tomplum/libs/input/InputReader.kt

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+package io.github.tomplum.libs.input
+
+import io.github.tomplum.libs.input.types.Input
+import io.github.tomplum.libs.input.types.IntegerInput
+import io.github.tomplum.libs.input.types.StringInput
+import java.io.File
+
+open class InputReader {
+    companion object {
+        @Suppress("UNCHECKED_CAST")
+        inline fun <reified T : Any> read(day: Day): Input<T> {
+            val lines = File(InputReader::class.java.getResource("/day${day.value}/input.txt").path).readLines()
+
+            return when (val cls = T::class.java) {
+                String::class.java -> StringInput(lines) as Input<T>
+                Integer::class.java -> IntegerInput(lines) as Input<T>
+                else -> throw UnsupportedOperationException("Input Reader does not support type: ${cls.simpleName}")
+            }
+        }
+    }
+}

src/main/kotlin/io/github/tomplum/libs/input/types/Input.kt

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+package io.github.tomplum.libs.input.types
+
+abstract class Input<T>(val value: List<T>) {
+    fun asSingleString() = value.joinToString(separator = "\n")
+}

src/main/kotlin/io/github/tomplum/libs/input/types/IntegerInput.kt

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+package io.github.tomplum.libs.input.types
+
+class IntegerInput(input: List<String>) : Input<Int>(input.map { it.toInt() })

src/main/kotlin/io/github/tomplum/libs/input/types/StringInput.kt

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+package io.github.tomplum.libs.input.types
+
+class StringInput(values: List<String>) : Input<String>(values)

src/test/kotlin/io/github/tomplum/libs/input/InputReaderTest.kt

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+package io.github.tomplum.libs.input
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import io.github.tomplum.libs.input.Day
+import io.github.tomplum.libs.input.InputReader
+import io.github.tomplum.libs.input.types.StringInput
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+
+class InputReaderTest {
+
+    @Test
+    fun asString() {
+        assertThat(InputReader.read<String>(Day(100)).value).isEqualTo(listOf("1", "2", "3", "4", "5"))
+    }
+
+    @Test
+    fun asInteger() {
+        assertThat(InputReader.read<Int>(Day(100)).value).isEqualTo(listOf(1, 2, 3, 4, 5))
+    }
+
+    @Test
+    fun asSingleString() {
+        val input: StringInput = InputReader.read<String>(Day(100)) as StringInput
+        assertThat(input.asSingleString()).isEqualTo("1\n2\n3\n4\n5")
+    }
+
+    @Test
+    fun asInvalidType() {
+        val e = assertThrows<UnsupportedOperationException> { InputReader.read<Double>(Day(100)) }
+        assertThat(e.message).isEqualTo("Input Reader does not support type: Double")
+    }
+}

src/test/kotlin/io/github/tomplum/libs/input/InputTest.kt

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+package io.github.tomplum.libs.input
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import io.github.tomplum.libs.input.types.IntegerInput
+import org.junit.jupiter.api.Test
+
+class InputTest {
+    @Test
+    fun asSingleString() {
+        assertThat(IntegerInput(listOf("1", "4", "6")).asSingleString()).isEqualTo("1\n4\n6")
+    }
+}