1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/kotlin/me/bush/illnamethislater/ReflectUtil.kt b/src/main/kotlin/me/bush/illnamethislater/ReflectUtil.kt
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index 0000000..d03fe58
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+++ b/src/main/kotlin/me/bush/illnamethislater/ReflectUtil.kt
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+package me.bush.illnamethislater
+
+import java.lang.reflect.Modifier
+import kotlin.reflect.KCallable
+import kotlin.reflect.KClass
+import kotlin.reflect.KProperty
+import kotlin.reflect.full.allSuperclasses
+import kotlin.reflect.full.declaredMembers
+import kotlin.reflect.jvm.isAccessible
+import kotlin.reflect.jvm.javaField
+import kotlin.reflect.jvm.javaGetter
+import kotlin.reflect.typeOf
+
+/**
+ * Using [KClass.members] only returns public members, and using [KClass.declaredMembers]
+ * doesn't return inherited members. This returns all members, private and inherited.
+ *
+ * @author bush
+ * @since 1.0.0
+ */
+internal val <T : Any> KClass<T>.allMembers
+    get() = (declaredMembers + allSuperclasses.flatMap { it.declaredMembers }).asSequence()
+
+/**
+ * Checks if a [KCallable] is static on the jvm, and handles invocation accordingly.
+ * I am not aware of a better alternative that works with `object` classes.
+ *
+ * @author bush
+ * @since 1.0.0
+ */
+internal fun <R> KCallable<R>.handleCall(receiver: Any? = null): R {
+    isAccessible = true
+    return if (static) call() else call(receiver)
+}
+
+/**
+ * Checks if the calling [KCallable] is a static java field. Because Kotlin likes to be funny, properties
+ * belonging to `object` classes are static, but their getters are not. If there is a getter (the property
+ * is not private), we will be accessing that, otherwise we check if the field is static with Java reflection.
+ * This also lets us support static listeners in Java code.
+ *
+ * @author bush
+ * @since 1.0.0
+ */
+internal val KCallable<*>.static
+    get() = if (this !is KProperty<*> || javaGetter != null) false
+    else javaField?.let { Modifier.isStatic(it.modifiers) } ?: false
+
+/**
+ * Finds all listeners in a class. (properties and methods)
+ *
+ * @author bush
+ * @since 1.0.0
+ */
+@Suppress("UNCHECKED_CAST") // This cannot fail
+internal inline val KClass<*>.listeners
+    get() = allMembers.filter { it.returnType == typeOf<Listener>() } as Sequence<KCallable<Listener>>