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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/FileChannelImpl.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/FileChannelImpl.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/FileChannelImpl.java | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/FileChannelImpl.java b/libjava/classpath/gnu/java/nio/FileChannelImpl.java new file mode 100644 index 000000000..c17227d3d --- /dev/null +++ b/libjava/classpath/gnu/java/nio/FileChannelImpl.java @@ -0,0 +1,572 @@ +/* FileChannelImpl.java -- + Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.nio; + +import gnu.classpath.Configuration; +import gnu.java.nio.FileLockImpl; +import gnu.java.nio.VMChannel; + +import java.io.File; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.nio.MappedByteBuffer; +import java.nio.channels.ClosedChannelException; +import java.nio.channels.FileChannel; +import java.nio.channels.FileLock; +import java.nio.channels.NonReadableChannelException; +import java.nio.channels.NonWritableChannelException; +import java.nio.channels.ReadableByteChannel; +import java.nio.channels.WritableByteChannel; + +/** + * This file is not user visible ! + * But alas, Java does not have a concept of friendly packages + * so this class is public. + * Instances of this class are created by invoking getChannel + * Upon a Input/Output/RandomAccessFile object. + */ +public final class FileChannelImpl extends FileChannel +{ + // These are mode values for open(). + public static final int READ = 1; + public static final int WRITE = 2; + public static final int APPEND = 4; + + // EXCL is used only when making a temp file. + public static final int EXCL = 8; + public static final int SYNC = 16; + public static final int DSYNC = 32; + + public static final FileChannelImpl in; + public static final FileChannelImpl out; + public static final FileChannelImpl err; + + //private static native void init(); + + static + { + if (Configuration.INIT_LOAD_LIBRARY) + { + System.loadLibrary("javanio"); + } + + //init(); + + FileChannelImpl ch = null; + try + { + ch = new FileChannelImpl(VMChannel.getStdin(), READ); + } + catch (IOException ioe) + { + throw new Error(ioe); + } + in = ch; + + ch = null; + try + { + ch = new FileChannelImpl(VMChannel.getStdout(), WRITE); + } + catch (IOException ioe) + { + throw new Error(ioe); + } + out = ch; + + ch = null; + try + { + ch = new FileChannelImpl(VMChannel.getStderr(), WRITE); + } + catch (IOException ioe) + { + throw new Error(ioe); + } + err = ch; + } + + /** + * This is the actual native file descriptor value + */ + private VMChannel ch; + + private int mode; + + final String description; + + /* Open a file. MODE is a combination of the above mode flags. */ + /* This is a static factory method, so that VM implementors can decide + * substitute subclasses of FileChannelImpl. */ + public static FileChannelImpl create(File file, int mode) + throws IOException + { + return new FileChannelImpl(file, mode); + } + + private FileChannelImpl(File file, int mode) + throws IOException + { + String path = file.getPath(); + description = path; + this.mode = mode; + this.ch = new VMChannel(); + ch.openFile(path, mode); + + // First open the file and then check if it is a a directory + // to avoid race condition. + if (file.isDirectory()) + { + try + { + close(); + } + catch (IOException e) + { + /* ignore it */ + } + + throw new FileNotFoundException(description + " is a directory"); + } + } + + /** + * Constructor for default channels in, out and err. + * + * Used by init() (native code). + * + * @param fd the file descriptor (0, 1, 2 for stdin, stdout, stderr). + * + * @param mode READ or WRITE + */ + FileChannelImpl (VMChannel ch, int mode) + { + this.mode = mode; + this.description = "descriptor(" + ch.getState() + ")"; + this.ch = ch; + } + + public int available() throws IOException + { + return ch.available(); + } + + private long implPosition() throws IOException + { + return ch.position(); + } + + private void seek(long newPosition) throws IOException + { + ch.seek(newPosition); + } + + private void implTruncate(long size) throws IOException + { + ch.truncate(size); + } + + public void unlock(long pos, long len) throws IOException + { + ch.unlock(pos, len); + } + + public long size () throws IOException + { + return ch.size(); + } + + protected void implCloseChannel() throws IOException + { + ch.close(); + } + + /** + * Makes sure the Channel is properly closed. + */ + protected void finalize() throws IOException + { + if (ch.getState().isValid()) + close(); + } + + public int read (ByteBuffer dst) throws IOException + { + return ch.read(dst); + } + + public int read (ByteBuffer dst, long position) + throws IOException + { + if (position < 0) + throw new IllegalArgumentException ("position: " + position); + long oldPosition = implPosition (); + position (position); + int result = read(dst); + position (oldPosition); + + return result; + } + + public int read() throws IOException + { + return ch.read(); + } + + public long read (ByteBuffer[] dsts, int offset, int length) + throws IOException + { + return ch.readScattering(dsts, offset, length); + } + + public int write (ByteBuffer src) throws IOException + { + return ch.write(src); + } + + public int write (ByteBuffer src, long position) + throws IOException + { + if (position < 0) + throw new IllegalArgumentException ("position: " + position); + + if (!isOpen ()) + throw new ClosedChannelException (); + + if ((mode & WRITE) == 0) + throw new NonWritableChannelException (); + + int result; + long oldPosition; + + oldPosition = implPosition (); + seek (position); + result = write(src); + seek (oldPosition); + + return result; + } + + public void write (int b) throws IOException + { + ch.write(b); + } + + public long write(ByteBuffer[] srcs, int offset, int length) + throws IOException + { + return ch.writeGathering(srcs, offset, length); + } + + public MappedByteBuffer map (FileChannel.MapMode mode, + long position, long size) + throws IOException + { + char nmode = 0; + if (mode == MapMode.READ_ONLY) + { + nmode = 'r'; + if ((this.mode & READ) == 0) + throw new NonReadableChannelException(); + } + else if (mode == MapMode.READ_WRITE || mode == MapMode.PRIVATE) + { + nmode = mode == MapMode.READ_WRITE ? '+' : 'c'; + if ((this.mode & WRITE) != WRITE) + throw new NonWritableChannelException(); + if ((this.mode & READ) != READ) + throw new NonReadableChannelException(); + } + else + throw new IllegalArgumentException ("mode: " + mode); + + if (position < 0 || size < 0 || size > Integer.MAX_VALUE) + throw new IllegalArgumentException ("position: " + position + + ", size: " + size); + return ch.map(nmode, position, (int) size); + } + + /** + * msync with the disk + */ + public void force (boolean metaData) throws IOException + { + if (!isOpen ()) + throw new ClosedChannelException (); + + ch.flush(metaData); + } + + // like transferTo, but with a count of less than 2Gbytes + private int smallTransferTo (long position, int count, + WritableByteChannel target) + throws IOException + { + ByteBuffer buffer; + try + { + // Try to use a mapped buffer if we can. If this fails for + // any reason we'll fall back to using a ByteBuffer. + buffer = map (MapMode.READ_ONLY, position, count); + } + catch (IOException e) + { + buffer = ByteBuffer.allocate (count); + read (buffer, position); + buffer.flip(); + } + + return target.write (buffer); + } + + public long transferTo (long position, long count, + WritableByteChannel target) + throws IOException + { + if (position < 0 + || count < 0) + throw new IllegalArgumentException ("position: " + position + + ", count: " + count); + + if (!isOpen ()) + throw new ClosedChannelException (); + + if ((mode & READ) == 0) + throw new NonReadableChannelException (); + + final int pageSize = 65536; + long total = 0; + + while (count > 0) + { + int transferred + = smallTransferTo (position, (int)Math.min (count, pageSize), + target); + if (transferred < 0) + break; + total += transferred; + position += transferred; + count -= transferred; + } + + return total; + } + + // like transferFrom, but with a count of less than 2Gbytes + private int smallTransferFrom (ReadableByteChannel src, long position, + int count) + throws IOException + { + ByteBuffer buffer = null; + + if (src instanceof FileChannel) + { + try + { + // Try to use a mapped buffer if we can. If this fails + // for any reason we'll fall back to using a ByteBuffer. + buffer = ((FileChannel)src).map (MapMode.READ_ONLY, position, + count); + } + catch (IOException e) + { + } + } + + if (buffer == null) + { + buffer = ByteBuffer.allocate (count); + src.read (buffer); + buffer.flip(); + } + + return write (buffer, position); + } + + public long transferFrom (ReadableByteChannel src, long position, + long count) + throws IOException + { + if (position < 0 + || count < 0) + throw new IllegalArgumentException ("position: " + position + + ", count: " + count); + + if (!isOpen ()) + throw new ClosedChannelException (); + + if ((mode & WRITE) == 0) + throw new NonWritableChannelException (); + + final int pageSize = 65536; + long total = 0; + + while (count > 0) + { + int transferred = smallTransferFrom (src, position, + (int)Math.min (count, pageSize)); + if (transferred < 0) + break; + total += transferred; + position += transferred; + count -= transferred; + } + + return total; + } + + // Shared sanity checks between lock and tryLock methods. + private void lockCheck(long position, long size, boolean shared) + throws IOException + { + if (position < 0 + || size < 0) + throw new IllegalArgumentException ("position: " + position + + ", size: " + size); + + if (!isOpen ()) + throw new ClosedChannelException(); + + if (shared && ((mode & READ) == 0)) + throw new NonReadableChannelException(); + + if (!shared && ((mode & WRITE) == 0)) + throw new NonWritableChannelException(); + } + + public FileLock tryLock (long position, long size, boolean shared) + throws IOException + { + lockCheck(position, size, shared); + + boolean completed = false; + try + { + begin(); + boolean lockable = ch.lock(position, size, shared, false); + completed = true; + return (lockable + ? new FileLockImpl(this, position, size, shared) + : null); + } + finally + { + end(completed); + } + } + + public FileLock lock (long position, long size, boolean shared) + throws IOException + { + lockCheck(position, size, shared); + + boolean completed = false; + try + { + boolean lockable = ch.lock(position, size, shared, true); + completed = true; + return (lockable + ? new FileLockImpl(this, position, size, shared) + : null); + } + finally + { + end(completed); + } + } + + public long position () + throws IOException + { + if (!isOpen ()) + throw new ClosedChannelException (); + + return implPosition (); + } + + public FileChannel position (long newPosition) + throws IOException + { + if (newPosition < 0) + throw new IllegalArgumentException ("newPosition: " + newPosition); + + if (!isOpen ()) + throw new ClosedChannelException (); + + // FIXME note semantics if seeking beyond eof. + // We should seek lazily - only on a write. + seek (newPosition); + return this; + } + + public FileChannel truncate (long size) + throws IOException + { + if (size < 0) + throw new IllegalArgumentException ("size: " + size); + + if (!isOpen ()) + throw new ClosedChannelException (); + + if ((mode & WRITE) == 0) + throw new NonWritableChannelException (); + + if (size < size ()) + implTruncate (size); + + return this; + } + + public String toString() + { + return (super.toString() + + "[ fd: " + ch.getState() + + "; mode: " + Integer.toOctalString(mode) + + "; " + description + " ]"); + } + + /** + * @return The native file descriptor. + * / + public int getNativeFD() + { + return fd; + }*/ +} |