Android: Add AndroidDocumentInputSource, allowing for interop between…

… the AudioThumbnail and AndroidDocument types

modules/juce_core/juce_core.h

@@ -344,6 +344,7 @@ JUCE_END_IGNORE_WARNINGS_MSVC
 #include "memory/juce_AllocationHooks.h"
 #include "memory/juce_Reservoir.h"
 #include "files/juce_AndroidDocument.h"
+#include "streams/juce_AndroidDocumentInputSource.h"
 
 #if JUCE_CORE_INCLUDE_OBJC_HELPERS && (JUCE_MAC || JUCE_IOS)
  #include "native/juce_mac_ObjCHelpers.h"

modules/juce_core/streams/juce_AndroidDocumentInputSource.h

@@ -0,0 +1,79 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2022 - Raw Material Software Limited
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   The code included in this file is provided under the terms of the ISC license
+   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
+   To use, copy, modify, and/or distribute this software for any purpose with or
+   without fee is hereby granted provided that the above copyright notice and
+   this permission notice appear in all copies.
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+//==============================================================================
+/**
+    An InputSource backed by an AndroidDocument.
+
+    @see InputSource, AndroidDocument
+
+    @tags{Core}
+*/
+class JUCE_API  AndroidDocumentInputSource   : public InputSource
+{
+public:
+    //==============================================================================
+    /** Creates a new AndroidDocumentInputSource, backed by the provided document.
+    */
+    explicit AndroidDocumentInputSource (const AndroidDocument& doc)
+        : document (doc) {}
+
+    //==============================================================================
+    /** Returns a new InputStream to read this item.
+
+        @returns            an inputstream that the caller will delete, or nullptr if
+                            the document can't be opened.
+    */
+    InputStream* createInputStream() override
+    {
+        return document.createInputStream().release();
+    }
+
+    /** @internal
+
+        An AndroidDocument doesn't use conventional filesystem paths.
+        Use the member functions of AndroidDocument to locate relative items.
+
+        @param relatedItemPath  the relative pathname of the resource that is required
+        @returns            an input stream if relatedItemPath was empty, otherwise
+                            nullptr.
+    */
+    InputStream* createInputStreamFor (const String& relatedItemPath) override
+    {
+        return relatedItemPath.isEmpty() ? document.createInputStream().release() : nullptr;
+    }
+
+    /** Returns a hash code that uniquely represents this item.
+    */
+    int64 hashCode() const override
+    {
+        return document.getUrl().toString (true).hashCode64();
+    }
+
+private:
+    AndroidDocument document;
+};
+
+} // namespace juce