feat(sampleapp): add some UI

Signed-off-by: Nicklas Lundin <[email protected]>

Author: nicklasl

sampleapp/src/main/java/dev/openfeature/sdk/sampleapp/ExampleProvider.kt

@@ -0,0 +1,92 @@
+package dev.openfeature.sdk.sampleapp
+
+import dev.openfeature.sdk.*
+import kotlinx.coroutines.delay
+
+class ExampleProvider(override val hooks: List<Hook<*>> = listOf()) : FeatureProvider {
+
+    private var currentContext: EvaluationContext? = ImmutableContext()
+    var delayTime = 1000L
+    var returnDefaults = false
+    val flags = mutableMapOf<String, Any>().apply {
+        put("booleanFlag", true)
+        put("stringFlag", "this is a string")
+        put("intFlag", 1337)
+        put("doubleFlag", 42.0)
+        put(
+            "objectFlag",
+            Value.Structure(mapOf("key1" to Value.String("value"), "key2" to Value.Integer(10)))
+        )
+    }
+
+    override val metadata: ProviderMetadata
+        get() = object : ProviderMetadata {
+            override val name: String = "ExampleProvider"
+        }
+
+    override suspend fun initialize(initialContext: EvaluationContext?) {
+        currentContext = initialContext
+        // Simulate a delay in the provider initialization
+        delay(delayTime)
+    }
+
+    override fun shutdown() {
+
+    }
+
+    override suspend fun onContextSet(
+        oldContext: EvaluationContext?,
+        newContext: EvaluationContext
+    ) {
+        currentContext = newContext
+        delay(delayTime)
+    }
+
+    override fun getBooleanEvaluation(
+        key: String,
+        defaultValue: Boolean,
+        context: EvaluationContext?
+    ): ProviderEvaluation<Boolean> = generateProviderEvaluation<Boolean>(defaultValue, key)
+
+    override fun getStringEvaluation(
+        key: String,
+        defaultValue: String,
+        context: EvaluationContext?
+    ): ProviderEvaluation<String> = generateProviderEvaluation<String>(defaultValue, key)
+
+    override fun getIntegerEvaluation(
+        key: String,
+        defaultValue: Int,
+        context: EvaluationContext?
+    ): ProviderEvaluation<Int> = generateProviderEvaluation<Int>(defaultValue, key)
+
+    override fun getDoubleEvaluation(
+        key: String,
+        defaultValue: Double,
+        context: EvaluationContext?
+    ): ProviderEvaluation<Double> = generateProviderEvaluation<Double>(defaultValue, key)
+
+    override fun getObjectEvaluation(
+        key: String,
+        defaultValue: Value,
+        context: EvaluationContext?
+    ): ProviderEvaluation<Value> = generateProviderEvaluation<Value>(defaultValue, key)
+
+    private inline fun <reified T> generateProviderEvaluation(
+        defaultValue: T,
+        key: String
+    ): ProviderEvaluation<T> {
+        if (returnDefaults) {
+            return ProviderEvaluation(defaultValue, null, reason = "returnDefaults")
+        }
+        return with(flags) {
+            if (containsKey(key) && get(key) is T) {
+                ProviderEvaluation(get(key) as T, "variant1", reason = "match")
+            } else if (containsKey(key)) {
+                ProviderEvaluation(defaultValue, null, reason = "invalid type")
+            } else {
+                ProviderEvaluation(defaultValue, null, reason = "notfound")
+            }
+        }
+    }
+}