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package better.files;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Arrays;
/**
* Hand built using a char buffer
*/
public class ArrayBufferScanner extends AbstractScanner {
private char[] buffer = new char[1 << 4];
private int pos = 1;
private BufferedReader reader;
public ArrayBufferScanner(BufferedReader reader) {
super(reader);
this.reader = reader;
}
@Override
public boolean hasNext() {
return pos > 0;
}
private void loadBuffer() {
pos = 0;
try {
for (int i; (i = reader.read()) != -1; ) {
char c = (char) i;
if (c != ' ' && c != '\n' && c != '\t' && c != '\r' && c != '\f') {
if (pos == buffer.length) buffer = Arrays.copyOf(buffer, 2 * pos);
buffer[pos++] = c;
} else if (pos != 0) break;
}
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
public String current() {
return String.copyValueOf(buffer, 0, pos);
}
@Override
public String next() {
loadBuffer();
return current();
}
@Override
public String nextLine() {
try {
return reader.readLine();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
@Override
public int nextInt() {
loadBuffer();
final int radix = 10;
int result = 0;
int i = buffer[0] == '-' || buffer[0] == '+' ? 1 : 0;
for (checkValidNumber(pos > i); i < pos; i++) {
int digit = buffer[i] - '0';
checkValidNumber(0 <= digit && digit <= 9);
result = result * radix + digit;
}
return buffer[0] == '-' ? -result : result;
}
private void checkValidNumber(boolean condition) {
if (!condition) throw new NumberFormatException(current());
}
}
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