author | bpb |
Thu, 26 Oct 2017 11:08:31 -0700 | |
changeset 47460 | b6d959fae9ef |
parent 47235 | 9ef10c6e67b8 |
child 48224 | be0df5ab3093 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1994, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.io; |
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import java.nio.channels.FileChannel; |
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import sun.nio.ch.FileChannelImpl; |
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/** |
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* A <code>FileInputStream</code> obtains input bytes |
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* from a file in a file system. What files |
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* are available depends on the host environment. |
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* |
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* <p><code>FileInputStream</code> is meant for reading streams of raw bytes |
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* such as image data. For reading streams of characters, consider using |
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* <code>FileReader</code>. |
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* |
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* @author Arthur van Hoff |
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* @see java.io.File |
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* @see java.io.FileDescriptor |
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* @see java.io.FileOutputStream |
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* @see java.nio.file.Files#newInputStream |
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* @since 1.0 |
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*/ |
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public |
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class FileInputStream extends InputStream |
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{ |
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/* File Descriptor - handle to the open file */ |
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private final FileDescriptor fd; |
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/** |
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* The path of the referenced file |
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* (null if the stream is created with a file descriptor) |
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*/ |
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private final String path; |
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private volatile FileChannel channel; |
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private final Object closeLock = new Object(); |
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private volatile boolean closed; |
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/** |
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* Creates a <code>FileInputStream</code> by |
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* opening a connection to an actual file, |
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* the file named by the path name <code>name</code> |
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* in the file system. A new <code>FileDescriptor</code> |
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* object is created to represent this file |
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* connection. |
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* <p> |
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* First, if there is a security |
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* manager, its <code>checkRead</code> method |
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* is called with the <code>name</code> argument |
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* as its argument. |
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* <p> |
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* If the named file does not exist, is a directory rather than a regular |
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* file, or for some other reason cannot be opened for reading then a |
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* <code>FileNotFoundException</code> is thrown. |
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* |
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* @param name the system-dependent file name. |
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* @exception FileNotFoundException if the file does not exist, |
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* is a directory rather than a regular file, |
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* or for some other reason cannot be opened for |
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* reading. |
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* @exception SecurityException if a security manager exists and its |
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* <code>checkRead</code> method denies read access |
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* to the file. |
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* @see java.lang.SecurityManager#checkRead(java.lang.String) |
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*/ |
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public FileInputStream(String name) throws FileNotFoundException { |
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this(name != null ? new File(name) : null); |
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} |
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/** |
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* Creates a <code>FileInputStream</code> by |
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* opening a connection to an actual file, |
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* the file named by the <code>File</code> |
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* object <code>file</code> in the file system. |
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* A new <code>FileDescriptor</code> object |
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* is created to represent this file connection. |
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* <p> |
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* First, if there is a security manager, |
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* its <code>checkRead</code> method is called |
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* with the path represented by the <code>file</code> |
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* argument as its argument. |
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* <p> |
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* If the named file does not exist, is a directory rather than a regular |
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* file, or for some other reason cannot be opened for reading then a |
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* <code>FileNotFoundException</code> is thrown. |
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* |
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* @param file the file to be opened for reading. |
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* @exception FileNotFoundException if the file does not exist, |
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* is a directory rather than a regular file, |
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* or for some other reason cannot be opened for |
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* reading. |
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* @exception SecurityException if a security manager exists and its |
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* <code>checkRead</code> method denies read access to the file. |
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* @see java.io.File#getPath() |
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* @see java.lang.SecurityManager#checkRead(java.lang.String) |
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*/ |
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public FileInputStream(File file) throws FileNotFoundException { |
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String name = (file != null ? file.getPath() : null); |
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SecurityManager security = System.getSecurityManager(); |
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if (security != null) { |
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security.checkRead(name); |
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} |
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if (name == null) { |
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throw new NullPointerException(); |
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} |
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if (file.isInvalid()) { |
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throw new FileNotFoundException("Invalid file path"); |
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} |
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fd = new FileDescriptor(); |
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fd.attach(this); |
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path = name; |
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open(name); |
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} |
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/** |
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* Creates a <code>FileInputStream</code> by using the file descriptor |
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* <code>fdObj</code>, which represents an existing connection to an |
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* actual file in the file system. |
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* <p> |
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* If there is a security manager, its <code>checkRead</code> method is |
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* called with the file descriptor <code>fdObj</code> as its argument to |
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* see if it's ok to read the file descriptor. If read access is denied |
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* to the file descriptor a <code>SecurityException</code> is thrown. |
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* <p> |
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* If <code>fdObj</code> is null then a <code>NullPointerException</code> |
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* is thrown. |
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* <p> |
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* This constructor does not throw an exception if <code>fdObj</code> |
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* is {@link java.io.FileDescriptor#valid() invalid}. |
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* However, if the methods are invoked on the resulting stream to attempt |
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* I/O on the stream, an <code>IOException</code> is thrown. |
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* |
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* @param fdObj the file descriptor to be opened for reading. |
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* @throws SecurityException if a security manager exists and its |
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* <code>checkRead</code> method denies read access to the |
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* file descriptor. |
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* @see SecurityManager#checkRead(java.io.FileDescriptor) |
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*/ |
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public FileInputStream(FileDescriptor fdObj) { |
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SecurityManager security = System.getSecurityManager(); |
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if (fdObj == null) { |
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throw new NullPointerException(); |
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} |
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if (security != null) { |
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security.checkRead(fdObj); |
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} |
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fd = fdObj; |
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path = null; |
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/* |
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* FileDescriptor is being shared by streams. |
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* Register this stream with FileDescriptor tracker. |
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*/ |
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fd.attach(this); |
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} |
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/** |
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* Opens the specified file for reading. |
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* @param name the name of the file |
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*/ |
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private native void open0(String name) throws FileNotFoundException; |
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// wrap native call to allow instrumentation |
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/** |
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* Opens the specified file for reading. |
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* @param name the name of the file |
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*/ |
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private void open(String name) throws FileNotFoundException { |
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open0(name); |
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} |
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/** |
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* Reads a byte of data from this input stream. This method blocks |
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* if no input is yet available. |
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* |
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* @return the next byte of data, or <code>-1</code> if the end of the |
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* file is reached. |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public int read() throws IOException { |
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return read0(); |
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} |
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private native int read0() throws IOException; |
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/** |
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* Reads a subarray as a sequence of bytes. |
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* @param b the data to be written |
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* @param off the start offset in the data |
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* @param len the number of bytes that are written |
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* @exception IOException If an I/O error has occurred. |
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*/ |
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private native int readBytes(byte b[], int off, int len) throws IOException; |
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/** |
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* Reads up to <code>b.length</code> bytes of data from this input |
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* stream into an array of bytes. This method blocks until some input |
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* is available. |
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* |
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* @param b the buffer into which the data is read. |
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* @return the total number of bytes read into the buffer, or |
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* <code>-1</code> if there is no more data because the end of |
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* the file has been reached. |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public int read(byte b[]) throws IOException { |
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return readBytes(b, 0, b.length); |
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} |
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/** |
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* Reads up to <code>len</code> bytes of data from this input stream |
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* into an array of bytes. If <code>len</code> is not zero, the method |
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* blocks until some input is available; otherwise, no |
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* bytes are read and <code>0</code> is returned. |
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* |
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* @param b the buffer into which the data is read. |
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* @param off the start offset in the destination array <code>b</code> |
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* @param len the maximum number of bytes read. |
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* @return the total number of bytes read into the buffer, or |
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* <code>-1</code> if there is no more data because the end of |
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* the file has been reached. |
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* @exception NullPointerException If <code>b</code> is <code>null</code>. |
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* @exception IndexOutOfBoundsException If <code>off</code> is negative, |
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* <code>len</code> is negative, or <code>len</code> is greater than |
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* <code>b.length - off</code> |
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* @exception IOException if an I/O error occurs. |
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*/ |
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public int read(byte b[], int off, int len) throws IOException { |
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return readBytes(b, off, len); |
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} |
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/** |
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* Skips over and discards <code>n</code> bytes of data from the |
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* input stream. |
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* |
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* <p>The <code>skip</code> method may, for a variety of |
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* reasons, end up skipping over some smaller number of bytes, |
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* possibly <code>0</code>. If <code>n</code> is negative, the method |
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* will try to skip backwards. In case the backing file does not support |
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* backward skip at its current position, an <code>IOException</code> is |
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* thrown. The actual number of bytes skipped is returned. If it skips |
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* forwards, it returns a positive value. If it skips backwards, it |
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* returns a negative value. |
2 | 271 |
* |
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* <p>This method may skip more bytes than what are remaining in the |
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* backing file. This produces no exception and the number of bytes skipped |
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* may include some number of bytes that were beyond the EOF of the |
275 |
* backing file. Attempting to read from the stream after skipping past |
|
276 |
* the end will result in -1 indicating the end of the file. |
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* |
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* @param n the number of bytes to be skipped. |
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* @return the actual number of bytes skipped. |
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* @exception IOException if n is negative, if the stream does not |
|
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* support seek, or if an I/O error occurs. |
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*/ |
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public long skip(long n) throws IOException { |
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return skip0(n); |
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} |
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private native long skip0(long n) throws IOException; |
2 | 288 |
|
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/** |
|
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* Returns an estimate of the number of remaining bytes that can be read (or |
|
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* skipped over) from this input stream without blocking by the next |
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* invocation of a method for this input stream. Returns 0 when the file |
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* position is beyond EOF. The next invocation might be the same thread |
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* or another thread. A single read or skip of this many bytes will not |
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* block, but may read or skip fewer bytes. |
2 | 296 |
* |
297 |
* <p> In some cases, a non-blocking read (or skip) may appear to be |
|
298 |
* blocked when it is merely slow, for example when reading large |
|
299 |
* files over slow networks. |
|
300 |
* |
|
301 |
* @return an estimate of the number of remaining bytes that can be read |
|
302 |
* (or skipped over) from this input stream without blocking. |
|
303 |
* @exception IOException if this file input stream has been closed by calling |
|
304 |
* {@code close} or an I/O error occurs. |
|
305 |
*/ |
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public int available() throws IOException { |
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return available0(); |
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} |
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309 |
|
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private native int available0() throws IOException; |
2 | 311 |
|
312 |
/** |
|
313 |
* Closes this file input stream and releases any system resources |
|
314 |
* associated with the stream. |
|
315 |
* |
|
316 |
* <p> If this stream has an associated channel then the channel is closed |
|
317 |
* as well. |
|
318 |
* |
|
319 |
* @exception IOException if an I/O error occurs. |
|
320 |
* |
|
321 |
* @revised 1.4 |
|
322 |
* @spec JSR-51 |
|
323 |
*/ |
|
324 |
public void close() throws IOException { |
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if (closed) { |
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return; |
2 | 327 |
} |
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synchronized (closeLock) { |
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if (closed) { |
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330 |
return; |
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331 |
} |
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closed = true; |
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333 |
} |
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334 |
|
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FileChannel fc = channel; |
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if (fc != null) { |
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// possible race with getChannel(), benign since |
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338 |
// FileChannel.close is final and idempotent |
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|
339 |
fc.close(); |
2 | 340 |
} |
341 |
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342 |
fd.closeAll(new Closeable() { |
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343 |
public void close() throws IOException { |
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|
344 |
fd.close(); |
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345 |
} |
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346 |
}); |
2 | 347 |
} |
348 |
||
349 |
/** |
|
350 |
* Returns the <code>FileDescriptor</code> |
|
351 |
* object that represents the connection to |
|
352 |
* the actual file in the file system being |
|
353 |
* used by this <code>FileInputStream</code>. |
|
354 |
* |
|
355 |
* @return the file descriptor object associated with this stream. |
|
356 |
* @exception IOException if an I/O error occurs. |
|
357 |
* @see java.io.FileDescriptor |
|
358 |
*/ |
|
359 |
public final FileDescriptor getFD() throws IOException { |
|
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360 |
if (fd != null) { |
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361 |
return fd; |
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|
362 |
} |
2 | 363 |
throw new IOException(); |
364 |
} |
|
365 |
||
366 |
/** |
|
367 |
* Returns the unique {@link java.nio.channels.FileChannel FileChannel} |
|
368 |
* object associated with this file input stream. |
|
369 |
* |
|
370 |
* <p> The initial {@link java.nio.channels.FileChannel#position() |
|
18786 | 371 |
* position} of the returned channel will be equal to the |
2 | 372 |
* number of bytes read from the file so far. Reading bytes from this |
373 |
* stream will increment the channel's position. Changing the channel's |
|
374 |
* position, either explicitly or by reading, will change this stream's |
|
375 |
* file position. |
|
376 |
* |
|
377 |
* @return the file channel associated with this file input stream |
|
378 |
* |
|
379 |
* @since 1.4 |
|
380 |
* @spec JSR-51 |
|
381 |
*/ |
|
382 |
public FileChannel getChannel() { |
|
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|
383 |
FileChannel fc = this.channel; |
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|
384 |
if (fc == null) { |
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|
385 |
synchronized (this) { |
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|
386 |
fc = this.channel; |
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|
387 |
if (fc == null) { |
47460
b6d959fae9ef
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|
388 |
this.channel = fc = FileChannelImpl.open(fd, path, true, |
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|
389 |
false, false, this); |
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|
390 |
if (closed) { |
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|
391 |
try { |
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|
392 |
// possible race with close(), benign since |
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|
393 |
// FileChannel.close is final and idempotent |
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|
394 |
fc.close(); |
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|
395 |
} catch (IOException ioe) { |
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|
396 |
throw new InternalError(ioe); // should not happen |
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|
397 |
} |
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|
398 |
} |
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|
399 |
} |
2 | 400 |
} |
401 |
} |
|
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|
402 |
return fc; |
2 | 403 |
} |
404 |
||
405 |
private static native void initIDs(); |
|
406 |
||
407 |
||
408 |
static { |
|
409 |
initIDs(); |
|
410 |
} |
|
411 |
||
412 |
/** |
|
413 |
* Ensures that the <code>close</code> method of this file input stream is |
|
414 |
* called when there are no more references to it. |
|
415 |
* |
|
44534 | 416 |
* @deprecated The {@code finalize} method has been deprecated. |
417 |
* Subclasses that override {@code finalize} in order to perform cleanup |
|
418 |
* should be modified to use alternative cleanup mechanisms and |
|
419 |
* to remove the overriding {@code finalize} method. |
|
420 |
* When overriding the {@code finalize} method, its implementation must explicitly |
|
421 |
* ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}. |
|
422 |
* See the specification for {@link Object#finalize()} for further |
|
423 |
* information about migration options. |
|
424 |
* |
|
2 | 425 |
* @exception IOException if an I/O error occurs. |
426 |
* @see java.io.FileInputStream#close() |
|
427 |
*/ |
|
44534 | 428 |
@Deprecated(since="9") |
2 | 429 |
protected void finalize() throws IOException { |
46
ddf5deb2a633
6631437: File{In,Out}putStream minor improvements to spec and stylistic improvements to code
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changeset
|
430 |
if ((fd != null) && (fd != FileDescriptor.in)) { |
11017
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|
431 |
/* if fd is shared, the references in FileDescriptor |
353f81426721
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|
432 |
* will ensure that finalizer is only called when |
353f81426721
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|
433 |
* safe to do so. All references using the fd have |
353f81426721
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|
434 |
* become unreachable. We can call close() |
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|
435 |
*/ |
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|
436 |
close(); |
2 | 437 |
} |
438 |
} |
|
439 |
} |