UriLoader.java

package com.bumptech.glide.load.model;

import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import com.bumptech.glide.load.data.DataFetcher;

public abstract class UriLoader<T> implements ModelLoader<Uri, T>{
    private final Context context;
    private final ModelLoader<GlideUrl, T> urlLoader;

    public UriLoader(Context context, ModelLoader<GlideUrl, T> urlLoader) {
        this.context = context;
        this.urlLoader = urlLoader;
    }

    @Override
    public final DataFetcher<T> getResourceFetcher(Uri model, int width, int height) {
        final String scheme = model.getScheme();

        DataFetcher<T> result = null;
        if (isLocalUri(scheme)) {
            result = getLocalUriFetcher(context, model);
        } else if (urlLoader != null && ("http".equals(scheme) || "https".equals(scheme))) {
            result = urlLoader.getResourceFetcher(new GlideUrl(model.toString()), width, height);
        }

        return result;
    }

    @Override
    public final String getId(Uri model) {
        return model.toString();
    }

    protected abstract DataFetcher<T> getLocalUriFetcher(Context context, Uri uri);

    private boolean isLocalUri(String scheme) {
        return ContentResolver.SCHEME_FILE.equals(scheme)
                || ContentResolver.SCHEME_CONTENT.equals(scheme)
                || ContentResolver.SCHEME_ANDROID_RESOURCE.equals(scheme);
    }
}