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package com.bumptech.glide.load.model.stream;
import android.content.Context;
import android.text.TextUtils;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.model.ModelCache;
import com.bumptech.glide.load.model.GlideUrl;
import com.bumptech.glide.load.model.ModelLoader;
import com.bumptech.glide.load.data.DataFetcher;
import java.io.InputStream;
/**
* A base class for loading images over http/https. Can be subclassed for use with any model that can be translated
* in to {@link java.io.InputStream} data.
*
* @param <T> The type of the model.
*/
public abstract class BaseGlideUrlLoader<T> implements StreamModelLoader<T> {
private final ModelLoader<GlideUrl, InputStream> concreteLoader;
private final ModelCache<T, GlideUrl> modelCache;
public BaseGlideUrlLoader(Context context) {
this(context, null);
}
public BaseGlideUrlLoader(Context context, ModelCache<T, GlideUrl> modelCache) {
this(Glide.buildModelLoader(GlideUrl.class, InputStream.class, context), modelCache);
}
public BaseGlideUrlLoader(ModelLoader<GlideUrl, InputStream> concreteLoader) {
this(concreteLoader, null);
}
public BaseGlideUrlLoader(ModelLoader<GlideUrl, InputStream> concreteLoader, ModelCache<T, GlideUrl> modelCache) {
this.concreteLoader = concreteLoader;
this.modelCache = modelCache;
}
@Override
public DataFetcher<InputStream> getResourceFetcher(T model, int width, int height) {
GlideUrl result = null;
if (modelCache != null) {
result = modelCache.get(model, width, height);
}
if (result == null) {
String stringURL = getUrl(model, width, height);
if (TextUtils.isEmpty(stringURL)) {
return null;
}
result = new GlideUrl(stringURL);
if (modelCache != null) {
modelCache.put(model, width, height, result);
}
}
return concreteLoader.getResourceFetcher(result, width, height);
}
/**
* Get a valid url http:// or https:// for the given model and dimensions as a string.
*
* @param model The model.
* @param width The width in pixels of the view/target the image will be loaded into.
* @param height The height in pixels of the view/target the image will be loaded into.
* @return The String url.
*/
protected abstract String getUrl(T model, int width, int height);
}
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