Move scheme names to handlers

markwon-image-loader/src/main/java/ru/noties/markwon/il/AsyncDrawableLoader.java

@@ -225,8 +225,18 @@ public class AsyncDrawableLoader implements AsyncDrawable.Loader {
          * @since 2.0.0
          */
         @NonNull
-        public Builder schemeHandler(@NonNull String scheme, @Nullable SchemeHandler schemeHandler) {
+        public Builder addSchemeHandler(@NonNull SchemeHandler schemeHandler) {
-            schemeHandlers.put(scheme, schemeHandler);
+
+            SchemeHandler previous;
+
+            for (String scheme : schemeHandler.schemes()) {
+                previous = schemeHandlers.put(scheme, schemeHandler);
+                if (previous != null) {
+                    throw new IllegalStateException(String.format("Multiple scheme handlers handle " +
+                            "the same scheme: `%s`, %s %s", scheme, previous, schemeHandler));
+                }
+            }
+
             return this;
         }
 
@@ -261,33 +271,13 @@ public class AsyncDrawableLoader implements AsyncDrawable.Loader {
 
             // @since 2.0.0
             // put default scheme handlers (to mimic previous behavior)
-            {
+            if (schemeHandlers.size() == 0) {
-
+                if (client == null) {
-                final boolean hasHttp = schemeHandlers.containsKey("http");
+                    client = new OkHttpClient();
-                final boolean hasHttps = schemeHandlers.containsKey("https");
-
-                if (!hasHttp || !hasHttps) {
-
-                    if (client == null) {
-                        client = new OkHttpClient();
-                    }
-
-                    final NetworkSchemeHandler handler = NetworkSchemeHandler.create(client);
-                    if (!hasHttp) {
-                        schemeHandlers.put("http", handler);
-                    }
-                    if (!hasHttps) {
-                        schemeHandlers.put("https", handler);
-                    }
-                }
-
-                if (!schemeHandlers.containsKey("file")) {
-                    schemeHandlers.put("file", FileSchemeHandler.createWithAssets(resources.getAssets()));
-                }
-
-                if (!schemeHandlers.containsKey("data")) {
-                    schemeHandlers.put("data", DataUriSchemeHandler.create());
                 }
+                addSchemeHandler(NetworkSchemeHandler.create(client));
+                addSchemeHandler(FileSchemeHandler.createWithAssets(resources.getAssets()));
+                addSchemeHandler(DataUriSchemeHandler.create());
             }
 
             // add default media decoders if not specified

markwon-image-loader/src/main/java/ru/noties/markwon/il/DataUriSchemeHandler.java

@@ -6,6 +6,8 @@ import android.support.annotation.Nullable;
 import android.text.TextUtils;
 
 import java.io.ByteArrayInputStream;
+import java.util.Collection;
+import java.util.Collections;
 
 /**
  * @since 2.0.0
@@ -57,4 +59,10 @@ public class DataUriSchemeHandler extends SchemeHandler {
     public void cancel(@NonNull String raw) {
         // no op
     }
+
+    @NonNull
+    @Override
+    public Collection<String> schemes() {
+        return Collections.singleton("data");
+    }
 }

markwon-image-loader/src/main/java/ru/noties/markwon/il/FileSchemeHandler.java

@@ -11,6 +11,8 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -98,4 +100,10 @@ public class FileSchemeHandler extends SchemeHandler {
     public void cancel(@NonNull String raw) {
         // no op
     }
+
+    @NonNull
+    @Override
+    public Collection<String> schemes() {
+        return Collections.singleton("file");
+    }
 }

markwon-image-loader/src/main/java/ru/noties/markwon/il/NetworkSchemeHandler.java

@@ -6,6 +6,8 @@ import android.support.annotation.Nullable;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.List;
 
 import okhttp3.Call;
@@ -78,4 +80,10 @@ public class NetworkSchemeHandler extends SchemeHandler {
             }
         }
     }
+
+    @NonNull
+    @Override
+    public Collection<String> schemes() {
+        return Arrays.asList("http", "https");
+    }
 }

markwon-image-loader/src/main/java/ru/noties/markwon/il/SchemeHandler.java

@@ -4,6 +4,8 @@ import android.net.Uri;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
+import java.util.Collection;
+
 /**
  * @since 2.0.0
  */
@@ -13,4 +15,7 @@ public abstract class SchemeHandler {
     public abstract ImageItem handle(@NonNull String raw, @NonNull Uri uri);
 
     public abstract void cancel(@NonNull String raw);
+
+    @NonNull
+    public abstract Collection<String> schemes();
 }