1 package com.bumptech.glide.provider; 2 3 import com.bumptech.glide.util.MultiClassKey; 4 5 import java.util.HashMap; 6 import java.util.Map; 7 8 /** 9 * A class that allows {@link com.bumptech.glide.provider.DataLoadProvider}s to be registered and retrieved by the 10 * data and resource classes they provide encoders and decoders for. 11 */ 12 public class DataLoadProviderRegistry { 13 private static final MultiClassKey GET_KEY = new MultiClassKey(); 14 15 private final Map<MultiClassKey, DataLoadProvider<?, ?>> providers = 16 new HashMap<MultiClassKey, DataLoadProvider<?, ?>>(); 17 18 /** 19 * Registers the given {@link com.bumptech.glide.provider.DataLoadProvider} using the given classes so it can later 20 * be retrieved using the given classes. 21 * 22 * @param dataClass The class of the data that the provider provides encoders and decoders for. 23 * @param resourceClass The class of the resource that the provider provides encoders and decoders for. 24 * @param provider The provider. 25 * @param <T> The type of the data that the provider provides encoders and decoders for. 26 * @param <Z> The type of the resource that the provider provides encoders and decoders for. 27 */ 28 public <T, Z> void register(Class<T> dataClass, Class<Z> resourceClass, DataLoadProvider<T, Z> provider) { 29 //TODO: maybe something like DataLoadProvider<? super T, ? extends Z> may work here 30 providers.put(new MultiClassKey(dataClass, resourceClass), provider); 31 } 32 33 /** 34 * Returns the currently registered {@link com.bumptech.glide.provider.DataLoadProvider} for the given classes. 35 * 36 * @param dataClass The class of the data that the provider provides encoders and decoders for. 37 * @param resourceClass The class of the resource that the provider provides encoders and decoders for. 38 * @param <T> The type of the data that the provider provides encoders and decoders for. 39 * @param <Z> The type of the resource that the provider provides encoders and decoders for. 40 */ 41 @SuppressWarnings("unchecked") 42 public <T, Z> DataLoadProvider<T, Z> get(Class<T> dataClass, Class<Z> resourceClass) { 43 DataLoadProvider<?, ?> result; 44 synchronized (GET_KEY) { 45 GET_KEY.set(dataClass, resourceClass); 46 result = providers.get(GET_KEY); 47 } 48 if (result == null) { 49 result = EmptyDataLoadProvider.get(); 50 } 51 return (DataLoadProvider<T, Z>) result; 52 } 53 } 54
