Mega Code Archive
Convert Reader to InputStream
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*/
import java.io.*;
/**
* This class convert Reader to InputStream. It works by converting
* the characters to the encoding specified in constructor parameter.
*
* @author Petr Hamernik, David Strupl
*/
public class ReaderInputStream extends InputStream {
/** Input Reader class. */
private Reader reader;
private PipedOutputStream pos;
private PipedInputStream pis;
private OutputStreamWriter osw;
/** Creates new input stream from the given reader.
* Uses the platform default encoding.
* @param reader Input reader
*/
public ReaderInputStream(Reader reader) throws IOException {
this.reader = reader;
pos = new PipedOutputStream();
pis = new PipedInputStream(pos);
osw = new OutputStreamWriter(pos);
}
/** Creates new input stream from the given reader and encoding.
* @param reader Input reader
* @param encoding
*/
public ReaderInputStream(Reader reader, String encoding)
throws IOException {
this.reader = reader;
pos = new PipedOutputStream();
pis = new PipedInputStream(pos);
osw = new OutputStreamWriter(pos, encoding);
}
public int read() throws IOException {
if (pis.available() > 0) {
return pis.read();
}
int c = reader.read();
if (c == -1) {
return c;
}
osw.write(c);
osw.flush();
pos.flush();
return pis.read();
}
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0) {
return 0;
}
int c = read();
if (c == -1) {
return -1;
}
b[off] = (byte) c;
int i = 1;
// Don't try to fill up the buffer if the reader is waiting.
for (; (i < len) && reader.ready(); i++) {
c = read();
if (c == -1) {
return i;
}
b[off + i] = (byte) c;
}
return i;
}
public int available() throws IOException {
int i = pis.available();
if (i > 0) {
return i;
}
if (reader.ready()) {
// Char must produce at least one byte.
return 1;
} else {
return 0;
}
}
public void close() throws IOException {
reader.close();
osw.close();
pis.close();
}
}
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