1/* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.xml.internal.org.jvnet.mimepull; 27 28import java.io.*; 29 30/** 31 * Use {@link RandomAccessFile} for concurrent access of read 32 * and write partial part's content. 33 * 34 * @author Kohsuke Kawaguchi 35 * @author Jitendra Kotamraju 36 */ 37final class DataFile { 38 private WeakDataFile weak; 39 private long writePointer; 40 41 DataFile(File file) { 42 writePointer=0; 43 weak = new WeakDataFile(this, file); 44 } 45 46 /** 47 * 48 */ 49 void close() { 50 weak.close(); 51 } 52 53 /** 54 * Read data from the given file pointer position. 55 * 56 * @param pointer read position 57 * @param buf that needs to be filled 58 * @param offset the start offset of the data. 59 * @param length of data that needs to be read 60 */ 61 synchronized void read(long pointer, byte[] buf, int offset, int length ) { 62 weak.read(pointer, buf, offset, length); 63 } 64 65 void renameTo(File f) { 66 weak.renameTo(f); 67 } 68 69 /** 70 * Write data to the file 71 * 72 * @param data that needs to written to a file 73 * @param offset start offset in the data 74 * @param length no bytes to write 75 * @return file pointer before the write operation(or at which the 76 * data is written) 77 */ 78 synchronized long writeTo(byte[] data, int offset, int length) { 79 long temp = writePointer; 80 writePointer = weak.writeTo(writePointer, data, offset, length); 81 return temp; 82 } 83 84} 85