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/*
* Copyright 2019 JetBrains s.r.o.
*
* 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 kotlinx.serialization
import kotlinx.serialization.json.Json
import kotlinx.serialization.test.typeTokenOf
import org.junit.Test
import java.util.HashMap
import java.util.HashSet
import kotlin.collections.LinkedHashMap
import kotlin.collections.Map
import kotlin.collections.hashMapOf
import kotlin.collections.hashSetOf
import kotlin.reflect.*
import kotlin.test.*
class JavaCollectionsTest {
@Serializable
data class HasHashMap(
val s: String,
val hashMap: HashMap<Int, String>,
val hashSet: HashSet<Int>,
val linkedHashMap: LinkedHashMap<Int, String>,
val kEntry: Map.Entry<Int, String>?
)
@Test
fun testJavaCollectionsInsideClass() {
val original = HasHashMap("42", hashMapOf(1 to "1", 2 to "2"), hashSetOf(11), LinkedHashMap(), null)
val serializer = HasHashMap.serializer()
val string = Json.encodeToString(serializer = serializer, value = original)
assertEquals(
expected = """{"s":"42","hashMap":{"1":"1","2":"2"},"hashSet":[11],"linkedHashMap":{},"kEntry":null}""",
actual = string
)
val restored = Json.decodeFromString(deserializer = serializer, string = string)
assertEquals(expected = original, actual = restored)
}
@Test
fun testTopLevelMaps() {
// Returning null here is a deliberate choice: map constructor functions may return different specialized
// implementations (e.g., kotlin.collections.EmptyMap or java.util.Collections.SingletonMap)
// that may or may not be generic. Since we generally cannot return a generic serializer using Java class only,
// all attempts to get map serializer using only .javaClass should return null.
assertNull(serializerOrNull(emptyMap<String, String>().javaClass))
assertNull(serializerOrNull(mapOf<String, String>("a" to "b").javaClass))
assertNull(serializerOrNull(mapOf<String, String>("a" to "b", "b" to "c").javaClass))
// Correct ways of retrieving map serializer:
assertContains(
serializer(typeTokenOf<Map<String, String>>()).descriptor.serialName,
"kotlin.collections.LinkedHashMap"
)
assertContains(
serializer(typeTokenOf<java.util.LinkedHashMap<String, String>>()).descriptor.serialName,
"kotlin.collections.LinkedHashMap"
)
assertContains(
serializer(typeOf<LinkedHashMap<String, String>>()).descriptor.serialName,
"kotlin.collections.LinkedHashMap"
)
}
@Test
fun testTopLevelSetsAndLists() {
// Same reasoning as for maps
assertNull(serializerOrNull(emptyList<String>().javaClass))
assertNull(serializerOrNull(listOf<String>("a").javaClass))
assertNull(serializerOrNull(listOf<String>("a", "b").javaClass))
assertNull(serializerOrNull(emptySet<String>().javaClass))
assertNull(serializerOrNull(setOf<String>("a").javaClass))
assertNull(serializerOrNull(setOf<String>("a", "b").javaClass))
assertContains(
serializer(typeTokenOf<Set<String>>()).descriptor.serialName,
"kotlin.collections.LinkedHashSet"
)
assertContains(
serializer(typeTokenOf<List<String>>()).descriptor.serialName,
"kotlin.collections.ArrayList"
)
assertContains(
serializer(typeTokenOf<java.util.LinkedHashSet<String>>()).descriptor.serialName,
"kotlin.collections.LinkedHashSet"
)
assertContains(
serializer(typeTokenOf<java.util.ArrayList<String>>()).descriptor.serialName,
"kotlin.collections.ArrayList"
)
}
@Test
fun testAnonymousObject() {
val obj: Any = object {}
assertNull(serializerOrNull(obj.javaClass))
}
}
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