| package org.apache.archiva.transaction; |
| |
| /* |
| * 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 org.apache.commons.io.FileUtils; |
| import org.codehaus.plexus.digest.Digester; |
| import org.codehaus.plexus.digest.DigesterException; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Abstract class for the TransactionEvents |
| * |
| * |
| */ |
| public abstract class AbstractTransactionEvent |
| implements TransactionEvent |
| { |
| private Map<File, File> backups = new HashMap<>(); |
| |
| private List<File> createdDirs = new ArrayList<>(); |
| |
| private List<File> createdFiles = new ArrayList<>(); |
| |
| /** |
| * {@link List}<{@link Digester}> |
| */ |
| private List<? extends Digester> digesters; |
| |
| protected AbstractTransactionEvent() |
| { |
| this( new ArrayList<Digester>( 0 ) ); |
| } |
| |
| protected AbstractTransactionEvent( List<? extends Digester> digesters ) |
| { |
| this.digesters = digesters; |
| } |
| |
| protected List<? extends Digester> getDigesters() |
| { |
| return digesters; |
| } |
| |
| /** |
| * Method that creates a directory as well as all the parent directories needed |
| * |
| * @param dir The File directory to be created |
| * @throws IOException when an unrecoverable error occurred |
| */ |
| protected void mkDirs( File dir ) |
| throws IOException |
| { |
| List<File> createDirs = new ArrayList<>(); |
| |
| File parent = dir; |
| while ( !parent.exists() || !parent.isDirectory() ) |
| { |
| createDirs.add( parent ); |
| |
| parent = parent.getParentFile(); |
| } |
| |
| while ( !createDirs.isEmpty() ) |
| { |
| File directory = createDirs.remove( createDirs.size() - 1 ); |
| |
| if ( directory.mkdir() ) |
| { |
| createdDirs.add( directory ); |
| } |
| else |
| { |
| throw new IOException( "Failed to create directory: " + directory.getAbsolutePath() ); |
| } |
| } |
| } |
| |
| protected void revertMkDirs() |
| throws IOException |
| { |
| if ( createdDirs != null ) |
| { |
| Collections.reverse( createdDirs ); |
| |
| while ( !createdDirs.isEmpty() ) |
| { |
| File dir = (File) createdDirs.remove( 0 ); |
| |
| if ( dir.isDirectory() && dir.list().length == 0 ) |
| { |
| FileUtils.deleteDirectory( dir ); |
| } |
| else |
| { |
| //cannot rollback created directory if it still contains files |
| break; |
| } |
| } |
| } |
| } |
| |
| protected void revertFilesCreated() |
| throws IOException |
| { |
| Iterator<File> it = createdFiles.iterator(); |
| while ( it.hasNext() ) |
| { |
| File file = (File) it.next(); |
| file.delete(); |
| it.remove(); |
| } |
| } |
| |
| protected void createBackup( File file ) |
| throws IOException |
| { |
| if ( file.exists() && file.isFile() ) |
| { |
| File backup = File.createTempFile( "temp-", ".backup" ); |
| |
| FileUtils.copyFile( file, backup ); |
| |
| backup.deleteOnExit(); |
| |
| backups.put( file, backup ); |
| } |
| } |
| |
| protected void restoreBackups() |
| throws IOException |
| { |
| for ( Map.Entry<File, File> entry : backups.entrySet() ) |
| { |
| FileUtils.copyFile( entry.getValue(), entry.getKey() ); |
| } |
| } |
| |
| protected void restoreBackup( File file ) |
| throws IOException |
| { |
| File backup = (File) backups.get( file ); |
| if ( backup != null ) |
| { |
| FileUtils.copyFile( backup, file ); |
| } |
| } |
| |
| /** |
| * Create checksums of file using all digesters defined at construction time. |
| * |
| * @param file |
| * @param force whether existing checksums should be overwritten or not |
| * @throws IOException |
| */ |
| protected void createChecksums( File file, boolean force ) |
| throws IOException |
| { |
| for ( Digester digester : getDigesters() ) |
| { |
| File checksumFile = new File( file.getAbsolutePath() + "." + getDigesterFileExtension( digester ) ); |
| if ( checksumFile.exists() ) |
| { |
| if ( !force ) |
| { |
| continue; |
| } |
| createBackup( checksumFile ); |
| } |
| else |
| { |
| createdFiles.add( checksumFile ); |
| } |
| |
| try |
| { |
| writeStringToFile( checksumFile, digester.calc( file ) ); |
| } |
| catch ( DigesterException e ) |
| { |
| throw (IOException) e.getCause(); |
| } |
| } |
| } |
| |
| /** |
| * TODO: Remove in favor of using FileUtils directly. |
| */ |
| protected void writeStringToFile( File file, String content ) |
| throws IOException |
| { |
| FileUtils.writeStringToFile( file, content ); |
| } |
| |
| /** |
| * File extension for checksums |
| * TODO should be moved to plexus-digester ? |
| */ |
| protected String getDigesterFileExtension( Digester digester ) |
| { |
| return digester.getAlgorithm().toLowerCase().replaceAll( "-", "" ); |
| } |
| |
| } |