/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.nio.internal;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import org.apache.harmony.nio.Util;
import org.apache.harmony.nio.internal.nls.Messages;
/*
* Static methods for I/O util. Used by io package and nio package.
*
*/
public final class IOUtil {
// -------------------------------------------------------------------
// Class variables
// -------------------------------------------------------------------
private static final int DEFAULT_BUFFER_SIZE = 8192;
// -------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------
/*
* No instance.
*/
private IOUtil() {
super();
}
// -------------------------------------------------------------------
// Routine methods.
// -------------------------------------------------------------------
/*
* Read method for InputStreamReader and Channels.
*/
public static int readInputStreamReader(InputStream in, ByteBuffer bytes,
CharBuffer chars, CharsetDecoder decoder, Object lock)
throws IOException {
synchronized (lock) {
if (in != null) {
if (chars.limit() == chars.position()) {
fillBuf(in, bytes, chars, decoder);
}
if (chars.limit() == 0) {
return -1;
}
return chars.get();
}
// nio.06=InputStreamReader is closed.
throw new IOException(Messages.getString("nio.06")); //$NON-NLS-1$
}
}
/*
* Read method for InputStreamReader and Channels.
*/
public static int readInputStreamReader(char[] buf, int offset, int length,
InputStream in, ByteBuffer bytes, CharBuffer chars,
CharsetDecoder decoder, Object lock) throws IOException {
synchronized (lock) {
if (in != null) {
if (length == 0) {
return 0;
}
Util.assertArrayIndex(buf, offset, length);
// read at least once
if (chars.limit() == chars.position()) {
fillBuf(in, bytes, chars, decoder);
}
int position = chars.position();
int availableChars = chars.limit() - position;
// read at least once for one byte
int needChars = length;
while (availableChars < needChars) {
System.arraycopy(chars.array(), position, buf, offset,
availableChars);
chars.position(position + availableChars);
needChars -= availableChars;
offset += availableChars;
if (in.available() <= 0) {
return needChars == length ? -1 : length - needChars;
}
fillBuf(in, bytes, chars, decoder);
position = chars.position();
availableChars = chars.limit();
if (availableChars == 0) {
return needChars == length ? -1 : length - needChars;
}
}
System.arraycopy(chars.array(), position, buf, offset,
needChars);
chars.position(chars.position() + needChars);
return length;
}
// nio.06=InputStreamReader is closed.
throw new IOException(Messages.getString("nio.06")); //$NON-NLS-1$
}
}
/*
* refill the buffer from wrapped InputStream
*/
private static void fillBuf(InputStream in, ByteBuffer bytes,
CharBuffer chars, CharsetDecoder decoder) throws IOException {
chars.clear();
int read = 0;
try {
read = in.read(bytes.array());
} catch (IOException e) {
chars.limit(0);
throw e;
}
if (read == -1) {
chars.limit(0);
return;
}
bytes.limit(read);
boolean endOfInput = read < DEFAULT_BUFFER_SIZE;
CoderResult result = decoder.decode(bytes, chars, endOfInput);
if (result.isError()) {
throw new IOException(result.toString());
}
bytes.clear();
chars.flip();
}
/*
* Write method for OutputStreamWriter and Channels.
*/
public static void writeOutputStreamWriter(String str, int offset,
int count, OutputStream out, ByteBuffer bytes,
CharsetEncoder encoder, Object lock) throws IOException {
Util.assertArrayIndex(str.length(), offset, count);
CharBuffer chars = CharBuffer.wrap(str, offset, count + offset);
convert(lock, encoder, bytes, chars, out);
}
/*
* Write method for OutputStreamWriter and Channels.
*/
public static void writeOutputStreamWriter(int oneChar, OutputStream out,
ByteBuffer bytes, CharsetEncoder encoder, Object lock)
throws IOException {
synchronized (lock) {
if (encoder == null) {
// nio.07=Writer is closed.
throw new IOException(Messages.getString("nio.07")); //$NON-NLS-1$
}
CharBuffer chars = CharBuffer.wrap(new char[] { (char) oneChar });
convert(lock, encoder, bytes, chars, out);
}
}
/*
* Write method for OutputStreamWriter and Channels.
*/
public static void writeOutputStreamWriter(char[] buf, int offset,
int count, OutputStream out, ByteBuffer bytes,
CharsetEncoder encoder, Object lock) throws IOException {
Util.assertArrayIndex(buf, offset, count);
CharBuffer chars = CharBuffer.wrap(buf, offset, count);
convert(lock, encoder, bytes, chars, out);
}
/*
* Flush method for OutputStreamWriter and Channels.
*/
public static void flushOutputStreamWriter(OutputStream out,
ByteBuffer bytes, CharsetEncoder encoder, Object lock)
throws IOException {
synchronized (lock) {
if (encoder == null) {
// nio.07=Writer is closed.
throw new IOException(Messages.getString("nio.07")); //$NON-NLS-1$
}
int position;
if ((position = bytes.position()) > 0) {
bytes.flip();
out.write(bytes.array(), 0, position);
bytes.clear();
}
out.flush();
}
}
/*
* convert function used in write.
*/
private static void convert(Object lock, CharsetEncoder encoder,
ByteBuffer bytes, CharBuffer chars, OutputStream out)
throws IOException {
synchronized (lock) {
if (encoder == null) {
// nio.07=Writer is closed.
throw new IOException(Messages.getString("nio.07")); //$NON-NLS-1$
}
CoderResult result = encoder.encode(chars, bytes, true);
while (true) {
if (result.isError()) {
throw new IOException(result.toString());
} else if (result.isOverflow()) {
// flush the output buffer
flushOutputStreamWriter(out, bytes, encoder, lock);
result = encoder.encode(chars, bytes, true);
continue;
}
break;
}
}
}
}
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