1 package org.eclipse.aether.spi.connector.checksum; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import java.nio.ByteBuffer; 23 24 /** 25 * Implementation performing checksum calculation for specific algorithm. Instances of this interface are stateful, 26 * non-thread safe, and should not be reused. 27 * 28 * @since 1.8.0 29 */ 30 public interface ChecksumAlgorithm 31 { 32 /** 33 * Updates the checksum algorithm inner state with input. 34 */ 35 void update( ByteBuffer input ); 36 37 /** 38 * Returns the algorithm end result as string, never {@code null}. After invoking this method, this instance should 39 * be discarded and not reused. For new checksum calculation you have to get new instance. 40 * 41 * Values returned by this method are handled as "opaque strings", and are used for simple equality checks (matches 42 * or not matches the checksum), and are also persisted in this form (locally to file system but also uploaded as 43 * checksum files). Resolver itself never tries to "decode" or "interpret" this string in any other way. 44 */ 45 String checksum(); 46 }