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package com.jclark.xml.tok;
/**
* @version $Revision: 1.2 $ $Date: 1998/02/17 04:51:03 $
*/
public final class Buffer {
private static final int INIT_SIZE = 64;
private char[] buf = new char[INIT_SIZE];
private int len;
public void clear() {
len = 0;
}
public void append(char c) {
need(1);
buf[len++] = c;
}
public void appendRefCharPair(Token t) {
need(2);
t.getRefCharPair(buf, len);
len += 2;
}
public void append(Encoding enc, byte[] bbuf, int start, int end) {
need((end - start)/enc.getMinBytesPerChar());
len += enc.convert(bbuf, start, end, buf, len);
}
private void need(int n) {
if (len + n <= buf.length)
return;
char[] tem = buf;
if (n > tem.length)
buf = new char[n * 2];
else
buf = new char[tem.length << 1];
System.arraycopy(tem, 0, buf, 0, tem.length);
}
public byte[] getBytes() {
byte[] text = new byte[len << 1];
int j = 0;
for (int i = 0; i < len; i++) {
char c = buf[i];
text[j++] = (byte)(c >> 8);
text[j++] = (byte)(c & 0xFF);
}
return text;
}
public String toString() {
return new String(buf, 0, len);
}
public int length() {
return len;
}
public char charAt(int i) {
if (i >= len)
throw new IndexOutOfBoundsException();
return buf[i];
}
public void chop() {
--len;
}
}
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