| /* |
| * Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| */ |
| |
| package sun.nio.cs; |
| |
| import java.io.*; |
| import java.nio.*; |
| import java.nio.channels.*; |
| import java.nio.charset.*; |
| |
| public class StreamEncoder extends Writer |
| { |
| |
| private static final int DEFAULT_BYTE_BUFFER_SIZE = 8192; |
| |
| private volatile boolean closed; |
| |
| private void ensureOpen() throws IOException { |
| if (closed) |
| throw new IOException("Stream closed"); |
| } |
| |
| // Factories for java.io.OutputStreamWriter |
| public static StreamEncoder forOutputStreamWriter(OutputStream out, |
| Object lock, |
| String charsetName) |
| throws UnsupportedEncodingException |
| { |
| String csn = charsetName; |
| if (csn == null) |
| csn = Charset.defaultCharset().name(); |
| try { |
| if (Charset.isSupported(csn)) |
| return new StreamEncoder(out, lock, Charset.forName(csn)); |
| } catch (IllegalCharsetNameException x) { } |
| throw new UnsupportedEncodingException (csn); |
| } |
| |
| public static StreamEncoder forOutputStreamWriter(OutputStream out, |
| Object lock, |
| Charset cs) |
| { |
| return new StreamEncoder(out, lock, cs); |
| } |
| |
| public static StreamEncoder forOutputStreamWriter(OutputStream out, |
| Object lock, |
| CharsetEncoder enc) |
| { |
| return new StreamEncoder(out, lock, enc); |
| } |
| |
| |
| // Factory for java.nio.channels.Channels.newWriter |
| |
| public static StreamEncoder forEncoder(WritableByteChannel ch, |
| CharsetEncoder enc, |
| int minBufferCap) |
| { |
| return new StreamEncoder(ch, enc, minBufferCap); |
| } |
| |
| |
| // -- Public methods corresponding to those in OutputStreamWriter -- |
| |
| // All synchronization and state/argument checking is done in these public |
| // methods; the concrete stream-encoder subclasses defined below need not |
| // do any such checking. |
| |
| public String getEncoding() { |
| if (isOpen()) |
| return encodingName(); |
| return null; |
| } |
| |
| public void flushBuffer() throws IOException { |
| synchronized (lock) { |
| if (isOpen()) |
| implFlushBuffer(); |
| else |
| throw new IOException("Stream closed"); |
| } |
| } |
| |
| public void write(int c) throws IOException { |
| char cbuf[] = new char[1]; |
| cbuf[0] = (char) c; |
| write(cbuf, 0, 1); |
| } |
| |
| public void write(char cbuf[], int off, int len) throws IOException { |
| synchronized (lock) { |
| ensureOpen(); |
| if ((off < 0) || (off > cbuf.length) || (len < 0) || |
| ((off + len) > cbuf.length) || ((off + len) < 0)) { |
| throw new IndexOutOfBoundsException(); |
| } else if (len == 0) { |
| return; |
| } |
| implWrite(cbuf, off, len); |
| } |
| } |
| |
| public void write(String str, int off, int len) throws IOException { |
| /* Check the len before creating a char buffer */ |
| if (len < 0) |
| throw new IndexOutOfBoundsException(); |
| char cbuf[] = new char[len]; |
| str.getChars(off, off + len, cbuf, 0); |
| write(cbuf, 0, len); |
| } |
| |
| public void write(CharBuffer cb) throws IOException { |
| int position = cb.position(); |
| try { |
| synchronized (lock) { |
| ensureOpen(); |
| implWrite(cb); |
| } |
| } finally { |
| cb.position(position); |
| } |
| } |
| |
| public void flush() throws IOException { |
| synchronized (lock) { |
| ensureOpen(); |
| implFlush(); |
| } |
| } |
| |
| public void close() throws IOException { |
| synchronized (lock) { |
| if (closed) |
| return; |
| implClose(); |
| closed = true; |
| } |
| } |
| |
| private boolean isOpen() { |
| return !closed; |
| } |
| |
| |
| // -- Charset-based stream encoder impl -- |
| |
| private Charset cs; |
| private CharsetEncoder encoder; |
| private ByteBuffer bb; |
| |
| // Exactly one of these is non-null |
| private final OutputStream out; |
| private WritableByteChannel ch; |
| |
| // Leftover first char in a surrogate pair |
| private boolean haveLeftoverChar = false; |
| private char leftoverChar; |
| private CharBuffer lcb = null; |
| |
| private StreamEncoder(OutputStream out, Object lock, Charset cs) { |
| this(out, lock, |
| cs.newEncoder() |
| .onMalformedInput(CodingErrorAction.REPLACE) |
| .onUnmappableCharacter(CodingErrorAction.REPLACE)); |
| } |
| |
| private StreamEncoder(OutputStream out, Object lock, CharsetEncoder enc) { |
| super(lock); |
| this.out = out; |
| this.ch = null; |
| this.cs = enc.charset(); |
| this.encoder = enc; |
| |
| // This path disabled until direct buffers are faster |
| if (false && out instanceof FileOutputStream) { |
| ch = ((FileOutputStream)out).getChannel(); |
| if (ch != null) |
| bb = ByteBuffer.allocateDirect(DEFAULT_BYTE_BUFFER_SIZE); |
| } |
| if (ch == null) { |
| bb = ByteBuffer.allocate(DEFAULT_BYTE_BUFFER_SIZE); |
| } |
| } |
| |
| private StreamEncoder(WritableByteChannel ch, CharsetEncoder enc, int mbc) { |
| this.out = null; |
| this.ch = ch; |
| this.cs = enc.charset(); |
| this.encoder = enc; |
| this.bb = ByteBuffer.allocate(mbc < 0 |
| ? DEFAULT_BYTE_BUFFER_SIZE |
| : mbc); |
| } |
| |
| private void writeBytes() throws IOException { |
| bb.flip(); |
| int lim = bb.limit(); |
| int pos = bb.position(); |
| assert (pos <= lim); |
| int rem = (pos <= lim ? lim - pos : 0); |
| |
| if (rem > 0) { |
| if (ch != null) { |
| if (ch.write(bb) != rem) |
| assert false : rem; |
| } else { |
| out.write(bb.array(), bb.arrayOffset() + pos, rem); |
| } |
| } |
| bb.clear(); |
| } |
| |
| private void flushLeftoverChar(CharBuffer cb, boolean endOfInput) |
| throws IOException |
| { |
| if (!haveLeftoverChar && !endOfInput) |
| return; |
| if (lcb == null) |
| lcb = CharBuffer.allocate(2); |
| else |
| lcb.clear(); |
| if (haveLeftoverChar) |
| lcb.put(leftoverChar); |
| if ((cb != null) && cb.hasRemaining()) |
| lcb.put(cb.get()); |
| lcb.flip(); |
| while (lcb.hasRemaining() || endOfInput) { |
| CoderResult cr = encoder.encode(lcb, bb, endOfInput); |
| if (cr.isUnderflow()) { |
| if (lcb.hasRemaining()) { |
| leftoverChar = lcb.get(); |
| if (cb != null && cb.hasRemaining()) { |
| lcb.clear(); |
| lcb.put(leftoverChar).put(cb.get()).flip(); |
| continue; |
| } |
| return; |
| } |
| break; |
| } |
| if (cr.isOverflow()) { |
| assert bb.position() > 0; |
| writeBytes(); |
| continue; |
| } |
| cr.throwException(); |
| } |
| haveLeftoverChar = false; |
| } |
| |
| void implWrite(char cbuf[], int off, int len) |
| throws IOException |
| { |
| CharBuffer cb = CharBuffer.wrap(cbuf, off, len); |
| implWrite(cb); |
| } |
| |
| void implWrite(CharBuffer cb) |
| throws IOException |
| { |
| if (haveLeftoverChar) { |
| flushLeftoverChar(cb, false); |
| } |
| |
| while (cb.hasRemaining()) { |
| CoderResult cr = encoder.encode(cb, bb, false); |
| if (cr.isUnderflow()) { |
| assert (cb.remaining() <= 1) : cb.remaining(); |
| if (cb.remaining() == 1) { |
| haveLeftoverChar = true; |
| leftoverChar = cb.get(); |
| } |
| break; |
| } |
| if (cr.isOverflow()) { |
| assert bb.position() > 0; |
| writeBytes(); |
| continue; |
| } |
| cr.throwException(); |
| } |
| } |
| |
| void implFlushBuffer() throws IOException { |
| if (bb.position() > 0) |
| writeBytes(); |
| } |
| |
| void implFlush() throws IOException { |
| implFlushBuffer(); |
| if (out != null) |
| out.flush(); |
| } |
| |
| void implClose() throws IOException { |
| flushLeftoverChar(null, true); |
| try { |
| for (;;) { |
| CoderResult cr = encoder.flush(bb); |
| if (cr.isUnderflow()) |
| break; |
| if (cr.isOverflow()) { |
| assert bb.position() > 0; |
| writeBytes(); |
| continue; |
| } |
| cr.throwException(); |
| } |
| |
| if (bb.position() > 0) |
| writeBytes(); |
| if (ch != null) |
| ch.close(); |
| else |
| out.close(); |
| } catch (IOException x) { |
| encoder.reset(); |
| throw x; |
| } |
| } |
| |
| String encodingName() { |
| return ((cs instanceof HistoricallyNamedCharset) |
| ? ((HistoricallyNamedCharset)cs).historicalName() |
| : cs.name()); |
| } |
| } |