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Diffstat (limited to 'libjava/classpath/gnu/java/nio/ChannelWriter.java')
| -rw-r--r-- | libjava/classpath/gnu/java/nio/ChannelWriter.java | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/libjava/classpath/gnu/java/nio/ChannelWriter.java b/libjava/classpath/gnu/java/nio/ChannelWriter.java deleted file mode 100644 index 2441fb3..0000000 --- a/libjava/classpath/gnu/java/nio/ChannelWriter.java +++ /dev/null @@ -1,190 +0,0 @@ -/* ChannelWriter.java -- nio / writer bridge - Copyright (C) 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 java.io.IOException; -import java.io.Writer; -import java.nio.ByteBuffer; -import java.nio.CharBuffer; -import java.nio.channels.WritableByteChannel; -import java.nio.charset.CharsetEncoder; -import java.nio.charset.CoderResult; - -/** - * A Writer implementation that works by wrapping an NIO channel. - */ -public class ChannelWriter - extends Writer -{ - private static final int DEFAULT_BUFFER_CAP = 8192; - - /** - * The output channel. - */ - private WritableByteChannel byteChannel; - - /** - * The encoder to use. - */ - private CharsetEncoder enc; - - /** - * The byte buffer. Translated characters are stored here on their way out. - */ - private ByteBuffer byteBuffer; - - /** - * The character buffer. Characters are stored here on their way into - * the encoder. - */ - private CharBuffer charBuffer; - - private void writeBuffer() throws IOException - { - byteBuffer.flip(); - byteChannel.write(byteBuffer); - } - - /** - * Create a new instance, given the output byte channel, the encoder - * to use, and the minimum buffer capacity. - */ - public ChannelWriter(WritableByteChannel ch, CharsetEncoder enc, - int minBufferCap) - { - this.byteChannel = ch; - this.enc = enc; - if (minBufferCap == -1) - minBufferCap = DEFAULT_BUFFER_CAP; - this.byteBuffer - = ByteBuffer.allocate((int) (minBufferCap * enc.maxBytesPerChar())); - this.charBuffer = CharBuffer.allocate(minBufferCap); - this.charBuffer.clear(); - } - - /* (non-Javadoc) - * @see java.io.Writer#flush() - */ - public void flush() throws IOException - { - // Presumably if we have characters in our buffer, it is - // due to an underflow. So we don't bother trying to flush - // that here. - } - - /* (non-Javadoc) - * @see java.io.Writer#close() - */ - public void close() throws IOException - { - synchronized (lock) - { - if (enc == null) - throw new IOException("writer already closed"); - - byteBuffer.clear(); - charBuffer.flip(); - CoderResult res = enc.encode(charBuffer, byteBuffer, true); - if (res.isError() || res.isMalformed() || res.isUnmappable()) - res.throwException(); - writeBuffer(); - - byteBuffer.clear(); - res = enc.flush(byteBuffer); - if (res.isError() || res.isMalformed() || res.isUnmappable()) - res.throwException(); - writeBuffer(); - enc = null; - } - } - - /* (non-Javadoc) - * @see java.io.Writer#write(char[], int, int) - */ - public void write(char[] buf, int offset, int len) throws IOException - { - synchronized (lock) - { - if (enc == null) - throw new IOException("writer already closed"); - int lastLen = -1; - while (len > 0) - { - // Copy data into our character buffer. - int allowed = Math.min(charBuffer.remaining(), len); - charBuffer.put(buf, offset, allowed); - // Update for the next pass through the loop. - offset += allowed; - len -= allowed; - charBuffer.flip(); - // If we didn't make any progress, we want to clean up - // and save our state for the next write(). - if (len == lastLen) - { - if (len <= charBuffer.remaining()) - { - charBuffer.put(buf, offset, len); - charBuffer.flip(); - } - else - { - CharBuffer ncb = CharBuffer.allocate(charBuffer.length() - + len); - ncb.put(charBuffer); - ncb.put(buf, offset, len); - charBuffer = ncb; - } - break; - } - lastLen = len; - - // Convert. - byteBuffer.clear(); - CoderResult res = enc.encode(charBuffer, byteBuffer, false); - // Compact here, as we want to leave the buffer in the - // right state for any future put()s. - charBuffer.compact(); - if (res.isError() || res.isMalformed() || res.isUnmappable()) - res.throwException(); - // Write the byte buffer to the output channel. - writeBuffer(); - } - } - } -} |