FileOutputStream.java revision f5597e626ecf7949d249dea08c1a2964d890ec11
1adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/* 2adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 3adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 4adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this work for additional information regarding copyright ownership. 5adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 6adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * (the "License"); you may not use this file except in compliance with 7adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the License. You may obtain a copy of the License at 8adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 9adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 10adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 11adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Unless required by applicable law or agreed to in writing, software 12adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 13adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * See the License for the specific language governing permissions and 15adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * limitations under the License. 16adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 17adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 18adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpackage java.io; 19adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 20adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.nio.channels.FileChannel; 21adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 22adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport org.apache.harmony.luni.platform.IFileSystem; 23adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport org.apache.harmony.luni.platform.Platform; 24adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport org.apache.harmony.luni.util.Msg; 25adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport org.apache.harmony.nio.FileChannelFactory; 26adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 27adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/** 28adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * A specialized {@link OutputStream} that writes to a file in the file system. 29adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * All write requests made by calling methods in this class are directly 30adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * forwarded to the equivalent function of the underlying operating system. 31adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Since this may induce some performance penalty, in particular if many small 32adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write requests are made, a FileOutputStream is often wrapped by a 33adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * BufferedOutputStream. 34f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 35adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @see BufferedOutputStream 36adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @see FileInputStream 37f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 38adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @since Android 1.0 39adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 40adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpublic class FileOutputStream extends OutputStream implements Closeable { 41adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 42adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 43adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The FileDescriptor representing this FileOutputStream. 44adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 45adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project FileDescriptor fd; 46adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 47adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project boolean innerFD; 48adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 49adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // The unique file channel associated with this FileInputStream (lazily 50adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // initialized). 51adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project private FileChannel channel; 52adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 53adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project private IFileSystem fileSystem = Platform.getFileSystem(); 54adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 55adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 56adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new FileOutputStream on the File {@code file}. If the file 57adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * exists, it is overwritten. 58f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 59adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param file 60adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the file to which this stream writes. 61adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws FileNotFoundException 62adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code file} cannot be opened for writing. 63adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws SecurityException 64adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if a {@code SecurityManager} is installed and it denies the 65adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write request. 66f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * @see java.lang.SecurityManager#checkWrite(FileDescriptor) 67adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 68adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileOutputStream(File file) throws FileNotFoundException { 69adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this(file, false); 70adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 71adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 72adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 73adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new FileOutputStream on the File {@code file}. The 74adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * parameter {@code append} determines whether or not the file is opened and 75adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * appended to or just opened and overwritten. 76f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 77adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param file 78adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the file to which this stream writes. 79adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param append 80adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * indicates whether or not to append to an existing file. 81adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws FileNotFoundException 82adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the {@code file} cannot be opened for writing. 83adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws SecurityException 84adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if a {@code SecurityManager} is installed and it denies the 85adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write request. 86f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * @see java.lang.SecurityManager#checkWrite(FileDescriptor) 87f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * @see java.lang.SecurityManager#checkWrite(String) 88adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 89adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileOutputStream(File file, boolean append) 90adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throws FileNotFoundException { 91adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project super(); 92adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project SecurityManager security = System.getSecurityManager(); 93adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (security != null) { 94adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project security.checkWrite(file.getPath()); 95adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 96adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fd = new FileDescriptor(); 97adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fd.descriptor = fileSystem.open(file.properPath(true), 98adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project append ? IFileSystem.O_APPEND : IFileSystem.O_WRONLY); 99adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project innerFD = true; 100adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project channel = FileChannelFactory.getFileChannel(this, fd.descriptor, 101adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project append ? IFileSystem.O_APPEND : IFileSystem.O_WRONLY); 102adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 103adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 104adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 105adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new FileOutputStream on the FileDescriptor {@code fd}. The 106adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * file must already be open, therefore no {@code FileNotFoundException} 107adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * will be thrown. 108f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 109adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param fd 110adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the FileDescriptor to which this stream writes. 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws NullPointerException 112adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code fd} is {@code null}. 113adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws SecurityException 114adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if a {@code SecurityManager} is installed and it denies the 115adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write request. 116f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * @see java.lang.SecurityManager#checkWrite(FileDescriptor) 117adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 118adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileOutputStream(FileDescriptor fd) { 119adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project super(); 120adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (fd == null) { 121adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new NullPointerException(Msg.getString("K006c")); //$NON-NLS-1$ 122adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 123adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project SecurityManager security = System.getSecurityManager(); 124adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (security != null) { 125adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project security.checkWrite(fd); 126adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 127adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.fd = fd; 128adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project innerFD = false; 129adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project channel = FileChannelFactory.getFileChannel(this, fd.descriptor, 130adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project IFileSystem.O_WRONLY); 131adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 132adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 133adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 134adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new FileOutputStream on the file named {@code filename}. If 135adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the file exists, it is overwritten. The {@code filename} may be absolute 136adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * or relative to the system property {@code "user.dir"}. 137f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 138adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param filename 139adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the name of the file to which this stream writes. 140adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws FileNotFoundException 141adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the file cannot be opened for writing. 142adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws SecurityException 143adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if a {@code SecurityManager} is installed and it denies the 144adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write request. 145adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 146adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileOutputStream(String filename) throws FileNotFoundException { 147adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this(filename, false); 148adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 149adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 150adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 151adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new FileOutputStream on the file named {@code filename}. 152adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The parameter {@code append} determines whether or not the file is opened 153adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * and appended to or just opened and overwritten. The {@code filename} may 154adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * be absolute or relative to the system property {@code "user.dir"}. 155f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 156adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param filename 157adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the name of the file to which this stream writes. 158f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * @param append 159f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * indicates whether or not to append to an existing file. 160adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws FileNotFoundException 161adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the file cannot be opened for writing. 162adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws SecurityException 163adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if a {@code SecurityManager} is installed and it denies the 164adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write request. 165adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 166adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileOutputStream(String filename, boolean append) 167adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throws FileNotFoundException { 168adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this(new File(filename), append); 169adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 170adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 171adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 172adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Closes this stream. This implementation closes the underlying operating 173adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * system resources allocated to represent this stream. 174f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 175adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 176adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an error occurs attempting to close this stream. 177adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 178adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 179adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void close() throws IOException { 180adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (fd == null) { 181adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // if fd is null, then the underlying file is not opened, so nothing 182adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // to close 183adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return; 184adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 185adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 186adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (channel != null) { 187adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project synchronized (channel) { 188adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (channel.isOpen() && fd.descriptor >= 0) { 189adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project channel.close(); 190adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 191adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 192adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 193adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 194adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project synchronized (this) { 195adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (fd.descriptor >= 0 && innerFD) { 196adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fileSystem.close(fd.descriptor); 197adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fd.descriptor = -1; 198adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 199adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 200adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 201adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 202adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 203adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Frees any resources allocated for this stream before it is garbage 204adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * collected. This method is called from the Java Virtual Machine. 205f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 206adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 207adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an error occurs attempting to finalize this stream. 208adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 209adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 210adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected void finalize() throws IOException { 211adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project close(); 212adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 213adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 214adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 215adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns the FileChannel equivalent to this output stream. 216adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * <p> 217adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The file channel is write-only and has an initial position within the 218adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * file that is the same as the current position of this stream within the 219adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * file. All changes made to the underlying file descriptor state via the 220adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * channel are visible by the output stream and vice versa. 221f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 222adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the file channel representation for this stream. 223adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 224adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public FileChannel getChannel() { 225adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return channel; 226adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 227adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 228adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 229adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns a FileDescriptor which represents the lowest level representation 230adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * of an operating system stream resource. 231f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 232adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return a FileDescriptor representing this stream. 233adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 234adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an error occurs attempting to get the FileDescriptor of 235adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this stream. 236adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 237adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public final FileDescriptor getFD() throws IOException { 238adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return fd; 239adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 240adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 241adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 242adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Writes the entire contents of the byte array {@code buffer} to this 243adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * stream. 244f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 245adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param buffer 246adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the buffer to be written to the file. 247adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 248adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if this stream is closed or an error occurs attempting to 249adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write to this stream. 250adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 251adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 252adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void write(byte[] buffer) throws IOException { 253adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project write(buffer, 0, buffer.length); 254adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 255adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 256adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 257adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Writes {@code count} bytes from the byte array {@code buffer} starting at 258adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code offset} to this stream. 259f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 260adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param buffer 261adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the buffer to write to this stream. 262adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param offset 263adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the index of the first byte in {@code buffer} to write. 264adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param count 265adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the number of bytes from {@code buffer} to write. 266adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IndexOutOfBoundsException 267adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code count < 0} or {@code offset < 0}, or if 268adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code count + offset} is greater than the length of 269adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code buffer}. 270adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 271adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if this stream is closed or an error occurs attempting to 272adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * write to this stream. 273adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws NullPointerException 274adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code buffer} is {@code null}. 275adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 276adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 277adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void write(byte[] buffer, int offset, int count) throws IOException { 278adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // BEGIN android-changed 279adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // Exception priorities (in case of multiple errors) differ from 280adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // RI, but are spec-compliant. 281adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // removed redundant check, made implicit null check explicit, 282adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // used (offset | count) < 0 instead of (offset < 0) || (count < 0) 283adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // to safe one operation 284adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (buffer == null) { 285adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new NullPointerException(Msg.getString("K0047")); //$NON-NLS-1$ 286adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 287adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if ((count | offset) < 0 || count > buffer.length - offset) { 288adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IndexOutOfBoundsException(Msg.getString("K002f")); //$NON-NLS-1$ 289adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 290adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // END android-changed 291adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 292adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (count == 0) { 293adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return; 294adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 295adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 296adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project openCheck(); 297adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fileSystem.write(fd.descriptor, buffer, offset, count); 298adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 299adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 300adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 301adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Writes the specified byte {@code oneByte} to this stream. Only the low 302adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * order byte of the integer {@code oneByte} is written. 303f5597e626ecf7949d249dea08c1a2964d890ec11Jesse Wilson * 304adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param oneByte 305adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the byte to be written. 306adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 307adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if this stream is closed an error occurs attempting to write 308adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * to this stream. 309adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 310adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 311adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void write(int oneByte) throws IOException { 312adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project openCheck(); 313adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project byte[] byteArray = new byte[1]; 314adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project byteArray[0] = (byte) oneByte; 315adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project fileSystem.write(fd.descriptor, byteArray, 0, 1); 316adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 317adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 318adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project private synchronized void openCheck() throws IOException { 319adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (fd.descriptor < 0) { 320adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IOException(); 321adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 322adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 323adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 324