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Merge pull request #4972 from sjudd:experimental_model_loader_resources
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library/src/main/java/com/bumptech/glide/load/model/DirectResourceLoader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| package com.bumptech.glide.load.model; | ||
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| import android.content.Context; | ||
| import android.content.res.AssetFileDescriptor; | ||
| import android.content.res.Resources; | ||
| import android.content.res.Resources.Theme; | ||
| import android.os.Build; | ||
| import android.os.Build.VERSION_CODES; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
| import com.bumptech.glide.Priority; | ||
| import com.bumptech.glide.load.DataSource; | ||
| import com.bumptech.glide.load.Options; | ||
| import com.bumptech.glide.load.data.DataFetcher; | ||
| import com.bumptech.glide.load.resource.drawable.ResourceDrawableDecoder; | ||
| import com.bumptech.glide.signature.ObjectKey; | ||
| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| /** | ||
| * Loads themed resource ids using {@link Resources#openRawResource(int)} or {@link | ||
| * Resources#openRawResourceFd(int)} using the theme from {@link ResourceDrawableDecoder#THEME} when | ||
| * it's available. | ||
| * | ||
| * @param <DataT> The type of data this {@code ModelLoader} will produce (e.g. {@link InputStream}, | ||
| * {@link AssetFileDescriptor} etc). | ||
| */ | ||
| public final class DirectResourceLoader<DataT extends Closeable> | ||
| implements ModelLoader<Integer, DataT> { | ||
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| private final Context context; | ||
| private final ResourceOpener<DataT> resourceOpener; | ||
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| public static ModelLoaderFactory<Integer, InputStream> inputStreamFactory(Context context) { | ||
| return new InputStreamFactory(context); | ||
| } | ||
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| public static ModelLoaderFactory<Integer, AssetFileDescriptor> assetFileDescriptorFactory( | ||
| Context context) { | ||
| return new AssetFileDescriptorFactory(context); | ||
| } | ||
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| DirectResourceLoader(Context context, ResourceOpener<DataT> resourceOpener) { | ||
| this.context = context.getApplicationContext(); | ||
| this.resourceOpener = resourceOpener; | ||
| } | ||
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| @Override | ||
| public LoadData<DataT> buildLoadData( | ||
| @NonNull Integer resourceId, int width, int height, @NonNull Options options) { | ||
| Theme theme = options.get(ResourceDrawableDecoder.THEME); | ||
| Resources resources = | ||
| Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP && theme != null | ||
| ? theme.getResources() | ||
| : context.getResources(); | ||
| return new LoadData<>( | ||
| // TODO(judds): We try to apply AndroidResourceSignature for caching in RequestBuilder. | ||
| // Arguably we should mix in that information here instead. | ||
| new ObjectKey(resourceId), | ||
| new ResourceDataFetcher<>(resources, resourceOpener, resourceId)); | ||
| } | ||
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| @Override | ||
| public boolean handles(@NonNull Integer integer) { | ||
| // We could check that this is in fact a resource ID, but doing so isn't free and in practice | ||
| // it doesn't seem to have been an issue historically. | ||
| return true; | ||
| } | ||
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| private interface ResourceOpener<DataT> { | ||
| DataT open(Resources resources, int resourceId); | ||
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| Class<DataT> getDataClass(); | ||
| } | ||
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| private static final class AssetFileDescriptorFactory | ||
| implements ModelLoaderFactory<Integer, AssetFileDescriptor>, | ||
| ResourceOpener<AssetFileDescriptor> { | ||
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| private final Context context; | ||
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| AssetFileDescriptorFactory(Context context) { | ||
| this.context = context; | ||
| } | ||
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| @Override | ||
| public AssetFileDescriptor open(Resources resources, int resourceId) { | ||
| return resources.openRawResourceFd(resourceId); | ||
| } | ||
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| @Override | ||
| public Class<AssetFileDescriptor> getDataClass() { | ||
| return AssetFileDescriptor.class; | ||
| } | ||
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| @NonNull | ||
| @Override | ||
| public ModelLoader<Integer, AssetFileDescriptor> build( | ||
| @NonNull MultiModelLoaderFactory multiFactory) { | ||
| return new DirectResourceLoader<>(context, this); | ||
| } | ||
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| @Override | ||
| public void teardown() {} | ||
| } | ||
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| private static final class InputStreamFactory | ||
| implements ModelLoaderFactory<Integer, InputStream>, ResourceOpener<InputStream> { | ||
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| private final Context context; | ||
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| InputStreamFactory(Context context) { | ||
| this.context = context; | ||
| } | ||
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| @NonNull | ||
| @Override | ||
| public ModelLoader<Integer, InputStream> build(@NonNull MultiModelLoaderFactory multiFactory) { | ||
| return new DirectResourceLoader<>(context, this); | ||
| } | ||
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| @Override | ||
| public InputStream open(Resources resources, int resourceId) { | ||
| return resources.openRawResource(resourceId); | ||
| } | ||
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| @Override | ||
| public Class<InputStream> getDataClass() { | ||
| return InputStream.class; | ||
| } | ||
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| @Override | ||
| public void teardown() {} | ||
| } | ||
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| private static final class ResourceDataFetcher<DataT extends Closeable> | ||
| implements DataFetcher<DataT> { | ||
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| private final Resources resources; | ||
| private final ResourceOpener<DataT> resourceOpener; | ||
| private final int resourceId; | ||
| private @Nullable DataT data; | ||
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| ResourceDataFetcher(Resources resources, ResourceOpener<DataT> resourceOpener, int resourceId) { | ||
| this.resources = resources; | ||
| this.resourceOpener = resourceOpener; | ||
| this.resourceId = resourceId; | ||
| } | ||
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| @Override | ||
| public void loadData( | ||
| @NonNull Priority priority, @NonNull DataCallback<? super DataT> callback) { | ||
| try { | ||
| data = resourceOpener.open(resources, resourceId); | ||
| callback.onDataReady(data); | ||
| } catch (Resources.NotFoundException e) { | ||
| callback.onLoadFailed(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public void cleanup() { | ||
| DataT local = data; | ||
| if (local != null) { | ||
| try { | ||
| local.close(); | ||
| } catch (IOException e) { | ||
| // Ignored. | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void cancel() {} | ||
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| @NonNull | ||
| @Override | ||
| public Class<DataT> getDataClass() { | ||
| return resourceOpener.getDataClass(); | ||
| } | ||
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| @NonNull | ||
| @Override | ||
| public DataSource getDataSource() { | ||
| return DataSource.LOCAL; | ||
| } | ||
| } | ||
| } |