001package org.eclipse.aether.internal.impl; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import java.io.ByteArrayInputStream; 023import java.io.ByteArrayOutputStream; 024import java.io.Closeable; 025import java.io.File; 026import java.io.FileInputStream; 027import java.io.IOException; 028import java.io.RandomAccessFile; 029import java.util.Map; 030import java.util.Properties; 031 032import javax.inject.Named; 033import javax.inject.Singleton; 034 035import org.slf4j.Logger; 036import org.slf4j.LoggerFactory; 037 038/** 039 * Manages access to a properties file. 040 */ 041@Singleton 042@Named 043public final class DefaultTrackingFileManager 044 implements TrackingFileManager 045{ 046 private static final Logger LOGGER = LoggerFactory.getLogger( DefaultTrackingFileManager.class ); 047 048 @Override 049 public Properties read( File file ) 050 { 051 FileInputStream stream = null; 052 try 053 { 054 if ( !file.exists() ) 055 { 056 return null; 057 } 058 059 stream = new FileInputStream( file ); 060 061 Properties props = new Properties(); 062 props.load( stream ); 063 064 return props; 065 } 066 catch ( IOException e ) 067 { 068 LOGGER.warn( "Failed to read tracking file {}", file, e ); 069 } 070 finally 071 { 072 close( stream, file ); 073 } 074 075 return null; 076 } 077 078 @Override 079 public Properties update( File file, Map<String, String> updates ) 080 { 081 Properties props = new Properties(); 082 083 File directory = file.getParentFile(); 084 if ( !directory.mkdirs() && !directory.exists() ) 085 { 086 LOGGER.warn( "Failed to create parent directories for tracking file {}", file ); 087 return props; 088 } 089 090 RandomAccessFile raf = null; 091 try 092 { 093 raf = new RandomAccessFile( file, "rw" ); 094 095 if ( file.canRead() ) 096 { 097 byte[] buffer = new byte[(int) raf.length()]; 098 099 raf.readFully( buffer ); 100 101 ByteArrayInputStream stream = new ByteArrayInputStream( buffer ); 102 103 props.load( stream ); 104 } 105 106 for ( Map.Entry<String, String> update : updates.entrySet() ) 107 { 108 if ( update.getValue() == null ) 109 { 110 props.remove( update.getKey() ); 111 } 112 else 113 { 114 props.setProperty( update.getKey(), update.getValue() ); 115 } 116 } 117 118 ByteArrayOutputStream stream = new ByteArrayOutputStream( 1024 * 2 ); 119 120 LOGGER.debug( "Writing tracking file {}", file ); 121 props.store( stream, "NOTE: This is a Maven Resolver internal implementation file" 122 + ", its format can be changed without prior notice." ); 123 124 raf.seek( 0 ); 125 raf.write( stream.toByteArray() ); 126 raf.setLength( raf.getFilePointer() ); 127 } 128 catch ( IOException e ) 129 { 130 LOGGER.warn( "Failed to write tracking file {}", file, e ); 131 } 132 finally 133 { 134 close( raf, file ); 135 } 136 137 return props; 138 } 139 140 private void close( Closeable closeable, File file ) 141 { 142 if ( closeable != null ) 143 { 144 try 145 { 146 closeable.close(); 147 } 148 catch ( IOException e ) 149 { 150 LOGGER.warn( "Error closing tracking file {}", file, e ); 151 } 152 } 153 } 154 155}