| package org.eclipse.aether.internal.impl; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.nio.charset.StandardCharsets; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * A simple digester for strings. |
| */ |
| class SimpleDigest |
| { |
| |
| private MessageDigest digest; |
| |
| private long hash; |
| |
| SimpleDigest() |
| { |
| try |
| { |
| digest = MessageDigest.getInstance( "SHA-1" ); |
| } |
| catch ( NoSuchAlgorithmException e ) |
| { |
| try |
| { |
| digest = MessageDigest.getInstance( "MD5" ); |
| } |
| catch ( NoSuchAlgorithmException ne ) |
| { |
| digest = null; |
| hash = 13; |
| } |
| } |
| } |
| |
| public void update( String data ) |
| { |
| if ( data == null || data.length() <= 0 ) |
| { |
| return; |
| } |
| if ( digest != null ) |
| { |
| digest.update( data.getBytes( StandardCharsets.UTF_8 ) ); |
| } |
| else |
| { |
| hash = hash * 31 + data.hashCode(); |
| } |
| } |
| |
| @SuppressWarnings( "checkstyle:magicnumber" ) |
| public String digest() |
| { |
| if ( digest != null ) |
| { |
| StringBuilder buffer = new StringBuilder( 64 ); |
| |
| byte[] bytes = digest.digest(); |
| for ( byte aByte : bytes ) |
| { |
| int b = aByte & 0xFF; |
| |
| if ( b < 0x10 ) |
| { |
| buffer.append( '0' ); |
| } |
| |
| buffer.append( Integer.toHexString( b ) ); |
| } |
| |
| return buffer.toString(); |
| } |
| else |
| { |
| return Long.toHexString( hash ); |
| } |
| } |
| |
| } |