1 package com.bumptech.glide.load; 2 3 import java.io.UnsupportedEncodingException; 4 import java.security.MessageDigest; 5 6 /** 7 * An interface that uniquely identifies some set of data. Implementations must implement {@link Object#equals(Object)} 8 * and {@link Object#hashCode()}. Implementations are generally expected to add all uniquely identifying information 9 * used in in {@link java.lang.Object#equals(Object)}} and {@link Object#hashCode()}} to the given 10 * {@link java.security.MessageDigest} in {@link #updateDiskCacheKey(java.security.MessageDigest)}}, although this 11 * requirement is not as strict for partial cache key signatures. 12 */ 13 public interface Key { 14 String STRING_CHARSET_NAME = "UTF-8"; 15 16 /** 17 * Adds all uniquely identifying information to the given digest. 18 * 19 * <p> 20 * Note - Using {@link java.security.MessageDigest#reset()} inside of this method will result in undefined 21 * behavior. 22 * </p> 23 */ updateDiskCacheKey(MessageDigest messageDigest)24 void updateDiskCacheKey(MessageDigest messageDigest) throws UnsupportedEncodingException; 25 26 @Override equals(Object o)27 boolean equals(Object o); 28 29 @Override hashCode()30 int hashCode(); 31 } 32