Java IO.pdf - Nguyen Dang Binh

public class DecimalFilter extends DumpFilter {
Java I/O
protected int numRead = 0;
protected int breakAfter = 15;
protected int ratio = 4; // number of bytes of output per byte of input
public DecimalFilter(InputStream in) {
super(in);
}
protected void fill() throws IOException {
}
buf = new int[ratio];
int datum = in.read();
this.numRead++;
if (datum == -1) {
// Let read() handle end of stream.
throw new EOFException();
}
String dec = Integer.toString(datum);
if (datum < 10) { // Add two leading zeros.
dec = "00" + dec;
}
else if (datum < 100) { // Add leading zero.
dec = '0' + dec;
}
for (int i = 0; i < dec.length(); i++) {
buf[i] = dec.charAt(i);
}
if (numRead < breakAfter) {
buf[buf.length - 1] = ' ';
}
else {
buf[buf.length - 1] = '\n';
numRead = 0;
}
public int available() throws IOException {
return (buf.length - index) + ratio * in.available();
}
// With some extra effort, you could provide more efficient
// implementations of these methods. You could even support
// marking and resetting.
/*
public int read(byte[] data, int offset, int length) throws IOException
{}
public long skip(long bytesToSkip) throws IOException {}
public synchronized void mark(int readlimit) {}
public synchronized void reset() throws IOException {}
public boolean markSupported() {}
*/
}
Example 6.11. HexFilter
package com.macfaq.io;
import java.io.*;
92