/*
Copyright (c) 2009-2011 Olivier Chafik, All Rights Reserved
This file is part of JNAerator (http://jnaerator.googlecode.com/).
JNAerator is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
JNAerator is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with JNAerator. If not, see <http://www.gnu.org/licenses/>.
*/
package org.anarres.cpp;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.nio.CharBuffer;
public class DeferredFileReader extends Reader {
Reader in;
File file;
//static java.util.HashSet<File> files = new java.util.HashSet<File>();
public DeferredFileReader(File file) throws FileNotFoundException {
this.file = file;
if (!file.exists())
throw new FileNotFoundException(file.toString());
//if (!files.add(file))
// in = new StringReader("");
//new Exception("Creating " + file).printStackTrace();
}
protected void open() throws FileNotFoundException {
if (in == null) {
in = new FileReader(file);
//new Exception("Opening " + file).printStackTrace();
//System.out.println("< " + file);
}
}
public File getFile() {
return file;
}
@Override
public void mark(int readAheadLimit) throws IOException {
open();
in.mark(readAheadLimit);
}
@Override
public boolean markSupported() {
try {
open();
return in.markSupported();
} catch (FileNotFoundException e) {
return false;
}
}
@Override
public boolean ready() throws IOException {
open();
return in.ready();
}
@Override
public void reset() throws IOException {
open();
in.reset();
}
@Override
public long skip(long n) throws IOException {
open();
return in.skip(n);
}
@Override
public String toString() {
return getClass().getName() + "[file=" + getFile() +"]";
}
@Override
public int hashCode() {
return getFile().hashCode();
}
@Override
public void close() throws IOException {
if (in != null) {
in.close();
//System.out.println("> " + file);
}
}
@Override
public int read(CharBuffer target) throws IOException {
open();
return in.read(target);
}
@Override
public int read(char[] cbuf) throws IOException {
open();
return in.read(cbuf);
}
@Override
public int read() throws IOException {
open();
return in.read();
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
open();
return in.read(cbuf, off, len);
}
}