From 3f98d6a8219237967f87b5a096afefc74605d460 Mon Sep 17 00:00:00 2001
From: Chris Loer <chris.loer@gmail.com>
Date: Tue, 16 Oct 2018 14:43:48 -0700
Subject: [android] Add OfflineManager.putResourceForURL Useful for pre-warming
 the ambient cache

---
 .../mapbox/mapboxsdk/offline/OfflineManager.java   | 21 ++++++++++++++++
 platform/android/src/offline/offline_manager.cpp   | 28 +++++++++++++++++++++-
 platform/android/src/offline/offline_manager.hpp   |  8 +++++++
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
index 06fb737c52..cf6233a805 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
@@ -462,4 +462,25 @@ public class OfflineManager {
 
   @Keep
   private native void mergeOfflineRegions(FileSource fileSource, String path, MergeOfflineRegionsCallback callback);
+
+  /**
+   * Insert the provided resource into the ambient cache
+   * This method mimics the caching that would take place if the equivalent
+   * resource were requested in the process of map rendering.
+   * Use this method to pre-warm the cache with resources you know
+   * will be requested.
+   *
+   * This call is asynchronous: the data may not be immediately available
+   * for in-progress requests, although subsequent requests should have
+   * access to the cached data.
+   *
+   * @param url The URL of the resource to insert
+   * @param data Response data to store for this resource. Data is expected to be uncompressed;
+   *             internally, the cache will compress data as necessary.
+   * @param modified Optional "modified" response header, in seconds since 1970, or 0 if not set
+   * @param expires Optional "expires" response header, in seconds since 1970, or 0 if not set
+   * @param etag Optional "entity tag" response header
+   */
+  @Keep
+  public native void putResourceWithUrl(String url, byte[] data, long modified, long expires, String etag);
 }
diff --git a/platform/android/src/offline/offline_manager.cpp b/platform/android/src/offline/offline_manager.cpp
index c6432f766a..07e10d4c81 100644
--- a/platform/android/src/offline/offline_manager.cpp
+++ b/platform/android/src/offline/offline_manager.cpp
@@ -121,7 +121,8 @@ void OfflineManager::registerNative(jni::JNIEnv& env) {
         METHOD(&OfflineManager::setOfflineMapboxTileCountLimit, "setOfflineMapboxTileCountLimit"),
         METHOD(&OfflineManager::listOfflineRegions, "listOfflineRegions"),
         METHOD(&OfflineManager::createOfflineRegion, "createOfflineRegion"),
-        METHOD(&OfflineManager::mergeOfflineRegions, "mergeOfflineRegions"));
+        METHOD(&OfflineManager::mergeOfflineRegions, "mergeOfflineRegions"),
+        METHOD(&OfflineManager::putResourceWithUrl, "putResourceWithUrl"));
 }
 
 // OfflineManager::ListOfflineRegionsCallback //
@@ -201,5 +202,30 @@ void OfflineManager::MergeOfflineRegionsCallback::onMerge(jni::JNIEnv& env,
     callback.Call(env, method, jregions);
 }
 
+void OfflineManager::putResourceWithUrl(jni::JNIEnv& env,
+                                        const jni::String& url_,
+                                        const jni::Array<jni::jbyte>& arr,
+                                        jlong modified,
+                                        jlong expires,
+                                        const jni::String& eTag_) {
+    auto url =  jni::Make<std::string>(env, url_);
+    auto data = std::make_shared<std::string>(arr.Length(env), char());
+    jni::GetArrayRegion(env, *arr, 0, data->size(), reinterpret_cast<jbyte*>(&(*data)[0]));
+    mbgl::Resource resource(mbgl::Resource::Kind::Unknown, url);
+    mbgl::Response response;
+    response.data = data;
+    if (eTag_) {
+        response.etag = jni::Make<std::string>(env, eTag_);
+    }
+    if (modified > 0) {
+        response.modified = Timestamp(mbgl::Seconds(modified));
+    }
+    if (expires > 0) {
+        response.expires = Timestamp(mbgl::Seconds(expires));
+    }
+
+    fileSource.put(resource, response);
+}
+
 } // namespace android
 } // namespace mbgl
diff --git a/platform/android/src/offline/offline_manager.hpp b/platform/android/src/offline/offline_manager.hpp
index b2ebc63a63..52c9ab70a0 100644
--- a/platform/android/src/offline/offline_manager.hpp
+++ b/platform/android/src/offline/offline_manager.hpp
@@ -75,6 +75,14 @@ public:
                              const jni::String&,
                              const jni::Object<MergeOfflineRegionsCallback>&);
 
+    void putResourceWithUrl(jni::JNIEnv&,
+                            const jni::String& url,
+                            const jni::Array<jni::jbyte>& data,
+                            jlong modified,
+                            jlong expires,
+                            const jni::String& eTag);
+
+
 private:
     mbgl::DefaultFileSource& fileSource;
 };
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