1 package com.bumptech.glide.load.resource.transcode; 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.load.resource.transcode.ResourceTranscoder}s to be registered and 10 * retrieved by the classes they convert between. 11 */ 12 public class TranscoderRegistry { 13 private static final MultiClassKey GET_KEY = new MultiClassKey(); 14 15 private final Map<MultiClassKey, ResourceTranscoder<?, ?>> factories = 16 new HashMap<MultiClassKey, ResourceTranscoder<?, ?>>(); 17 18 /** 19 * Registers the given {@link com.bumptech.glide.load.resource.transcode.ResourceTranscoder} using the given 20 * classes so it can later be retrieved using the given classes. 21 * 22 * @param decodedClass The class of the resource that the transcoder transcodes from. 23 * @param transcodedClass The class of the resource that the transcoder transcodes to. 24 * @param transcoder The transcoder. 25 * @param <Z> The type of the resource that the transcoder transcodes from. 26 * @param <R> The type of the resource that the transcoder transcodes to. 27 */ 28 public <Z, R> void register(Class<Z> decodedClass, Class<R> transcodedClass, ResourceTranscoder<Z, R> transcoder) { 29 factories.put(new MultiClassKey(decodedClass, transcodedClass), transcoder); 30 } 31 32 /** 33 * Returns the currently registered {@link com.bumptech.glide.load.resource.transcode.ResourceTranscoder} for the 34 * given classes. 35 * 36 * @param decodedClass The class of the resource that the transcoder transcodes from. 37 * @param transcodedClass The class of the resource that the transcoder transcodes to. 38 * @param <Z> The type of the resource that the transcoder transcodes from. 39 * @param <R> The type of the resource that the transcoder transcodes to. 40 */ 41 @SuppressWarnings("unchecked") 42 public <Z, R> ResourceTranscoder<Z, R> get(Class<Z> decodedClass, Class<R> transcodedClass) { 43 if (decodedClass.equals(transcodedClass)) { 44 // we know they're the same type (Z and R) 45 return (ResourceTranscoder<Z, R>) UnitTranscoder.get(); 46 } 47 final ResourceTranscoder<?, ?> result; 48 synchronized (GET_KEY) { 49 GET_KEY.set(decodedClass, transcodedClass); 50 result = factories.get(GET_KEY); 51 } 52 if (result == null) { 53 throw new IllegalArgumentException("No transcoder registered for " + decodedClass + " and " 54 + transcodedClass); 55 } 56 return (ResourceTranscoder<Z, R>) result; 57 } 58 } 59
