| /******************************************************************************* |
| * Copyright (c) 2010, 2011 Sonatype, Inc. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Sonatype, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.aether.internal.impl; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * A simple digester for strings. |
| */ |
| class SimpleDigest |
| { |
| |
| private MessageDigest digest; |
| |
| private long hash; |
| |
| public 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 ) |
| { |
| try |
| { |
| digest.update( data.getBytes( "UTF-8" ) ); |
| } |
| catch ( UnsupportedEncodingException e ) |
| { |
| // broken JVM |
| } |
| } |
| else |
| { |
| hash = hash * 31 + data.hashCode(); |
| } |
| } |
| |
| 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 ); |
| } |
| } |
| |
| } |