1 files changed, 37 insertions, 0 deletions
diff --git a/okio/src/commonMain/kotlin/okio/ForwardingSource.kt b/okio/src/commonMain/kotlin/okio/ForwardingSource.kt
new file mode 100644
index 00000000..0b3e9f6a
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+++ b/okio/src/commonMain/kotlin/okio/ForwardingSource.kt
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2014 Square, Inc.
+ *
+ * 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 okio
+
+/** A [Source] which forwards calls to another. Useful for subclassing. */
+expect abstract class ForwardingSource constructor(
+  /** [Source] to which this instance is delegating. */
+  delegate: Source,
+) : Source {
+  /** [Source] to which this instance is delegating. */
+  val delegate: Source
+
+  // TODO 'Source by delegate' once https://youtrack.jetbrains.com/issue/KT-23935 is fixed.
+
+  @Throws(IOException::class)
+  override fun read(sink: Buffer, byteCount: Long): Long
+
+  override fun timeout(): Timeout
+
+  @Throws(IOException::class)
+  override fun close()
+
+  override fun toString(): String
+}