package railo.runtime.functions.file;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import railo.commons.io.IOUtil;
import railo.commons.io.res.Resource;
import railo.runtime.exp.PageException;
import railo.runtime.exp.PageRuntimeException;
import railo.runtime.op.Caster;
public class FileStreamWrapperRead extends FileStreamWrapper {
private BufferedReader br;
private String charset;
private boolean seekable;
private RandomAccessFile raf;
/**
* Constructor of the class
* @param res
* @param charset
* @throws IOException
*/
public FileStreamWrapperRead(Resource res, String charset,boolean seekable) {
super(res);
this.charset=charset;
this.seekable=seekable;
}
@Override
public Object read(int len) throws IOException {
if(seekable) {
byte[] barr=new byte[len];
len = getRAF().read(barr);
if(len==-1) throw new IOException("End of file reached");
return new String(barr, 0, len, charset);
}
char[] carr=new char[len];
len = _getBR().read(carr);
if(len==-1) throw new IOException("End of file reached");
return new String(carr,0,len);
}
@Override
public String readLine() throws IOException {
if(seekable) {
return getRAF().readLine();
}
if(!_getBR().ready())
throw new IOException(" End of file reached");
return _getBR().readLine();
}
@Override
public void close() throws IOException {
super.setStatus(FileStreamWrapper.STATE_CLOSE);
if(br!=null)br.close();
if(raf!=null)raf.close();
}
@Override
public String getMode() {
return "read";
}
public boolean isEndOfFile() {
if(seekable){
long pos=0;
try {
pos = getRAF().getFilePointer();
} catch (IOException ioe) {
throw new PageRuntimeException(Caster.toPageException(ioe));
}
try {
if(raf.read()==-1) return true;
raf.seek(pos);
}
catch (IOException e) {
return true;
}
return false;
}
try {
return !_getBR().ready();
} catch (IOException e) {
return true;
}
}
@Override
public long getSize() {
return res.length();
}
@Override
public void skip(int len) throws PageException {
if(seekable){
try {
getRAF().skipBytes(len);
} catch (IOException e) {
throw Caster.toPageException(e);
}
return;
}
try {
_getBR().skip(len);
return;
}
catch (IOException e) {}
throw Caster.toPageException(new IOException("skip is only supported when you have set argument seekable of function fileOpen to true"));
}
public void seek(long pos) throws PageException {
if(seekable){
try {
getRAF().seek(pos);
} catch (IOException e) {
throw Caster.toPageException(e);
}
}
else throw Caster.toPageException(new IOException("seek is only supported when you have set argument seekable of function fileOpen to true"));
}
private RandomAccessFile getRAF() throws IOException {
if(raf==null){
if(!(res instanceof File))
throw new IOException("only resources for local filesytem support seekable");
raf = new RandomAccessFile((File)res,"r");
}
return raf;
}
private BufferedReader _getBR() throws IOException {
if(br==null){
br = IOUtil.toBufferedReader(IOUtil.getReader(res.getInputStream(),charset));
}
return br;
}
}