/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
/*
** $Id: CharArrayReader.java,v 1.2 2006/10/04 14:24:14 cvsroot Exp $
*/
package java.io;
public class CharArrayReader extends Reader {
protected char[] buf;
protected int count;
protected int markedPos;
protected int pos;
public CharArrayReader(char[] chars) {
this(chars, 0, chars.length);
}
public CharArrayReader(char[] chars, int off, int len) {
super();
if(off < 0 || len < 0 || off > chars.length){
throw new IllegalArgumentException();
}
buf = chars;
count = chars.length <(len + off) ? chars.length: len+off;
pos = off;
markedPos = off;
}
public int read() throws IOException {
synchronized(lock){
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
if(pos >= count){
return -1;
}
return buf[pos++];
}
}
public int read(char[] chars, int off, int len) throws IOException {
if(off < 0 || len < 0 || off > chars.length - len){
throw new ArrayIndexOutOfBoundsException();
}
synchronized(lock){
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
if(pos >= count){
return -1;
}
int rd = count-pos;
rd = rd > len ? len : rd;
System.arraycopy(buf, pos, chars, off, rd);
pos += rd;
return rd;
}
}
public long skip(long n) throws IOException {
if(n <= 0){
return 0;
}
synchronized(lock){
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
if(pos >= count){
return 0;
}
int skip = count-pos;
skip = skip > n ? (int)n : skip;
pos += skip;
return skip;
}
}
public boolean ready() throws IOException {
synchronized(lock){
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
return pos < count;
}
}
public boolean markSupported() {
return true;
}
public void mark(int readAheadLimit) throws IOException {
synchronized(lock){
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
markedPos = pos;
}
}
public void reset() throws IOException {
synchronized(lock) {
if(buf == null){
throw new IOException("cannot read from a closed Stream");
}
pos = markedPos;
}
}
public void close(){
synchronized(lock){
buf = null;
}
}
}