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package org.luaj.vm2.lib.jse;
import java.io.File;
import java.io.IOException;
/**
* Implementation of the lua os library for J2se.
*
* Implements features specific to the J2se environment:
*
* execute()
* remove()
* rename()
* tmpname()
*
*
* @see org.luaj.vm2.lib.OsLib
*/
public class JseOsLib extends org.luaj.vm2.lib.OsLib {
/** return code indicating the execute() threw an I/O exception */
public static int EXEC_IOEXCEPTION = 1;
/** return code indicating the execute() was interrupted */
public static int EXEC_INTERRUPTED = -2;
/** return code indicating the execute() threw an unknown exception */
public static int EXEC_ERROR = -3;
/** public constructor */
public JseOsLib() {
}
protected int execute(String command) {
Runtime r = Runtime.getRuntime();
try {
final Process p = r.exec(command);
try {
p.waitFor();
return p.exitValue();
} finally {
p.destroy();
}
} catch (IOException ioe) {
return EXEC_IOEXCEPTION;
} catch (InterruptedException e) {
return EXEC_INTERRUPTED;
} catch (Throwable t) {
return EXEC_ERROR;
}
}
protected void remove(String filename) throws IOException {
File f = new File(filename);
if ( ! f.exists() )
throw new IOException("No such file or directory");
if ( ! f.delete() )
throw new IOException("Failed to delete");
}
protected void rename(String oldname, String newname) throws IOException {
File f = new File(oldname);
if ( ! f.exists() )
throw new IOException("No such file or directory");
if ( ! f.renameTo(new File(newname)) )
throw new IOException("Failed to delete");
}
protected String tmpname() {
try {
java.io.File f = java.io.File.createTempFile(TMP_PREFIX ,TMP_SUFFIX);
return f.getName();
} catch ( IOException ioe ) {
return super.tmpname();
}
}
}