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#pragma once
#include <Exceptions.h>
#include <Printer.h>
namespace Balau {
class FileSystem {
public:
static int mkdir(const char * path) throw (GeneralException);
};
class ENoEnt : public GeneralException {
public:
ENoEnt(const char * name) : GeneralException(String("No such file or directory: `") + name + "'") { }
};
class IOBase;
template<class T>
class IO;
namespace Events {
class BaseEvent;
};
class Handle {
public:
virtual ~Handle() { Assert(m_refCount == 0); }
virtual void close() throw (GeneralException) = 0;
virtual bool isClosed() = 0;
virtual bool isEOF() = 0;
virtual bool canSeek();
virtual bool canRead();
virtual bool canWrite();
virtual const char * getName() = 0;
virtual ssize_t read(void * buf, size_t count) throw (GeneralException);
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException);
void writeString(const char * str, ssize_t len = -1) { if (len < 0) len = strlen(str); forceWrite(str, len); }
void writeString(const String & str) { forceWrite(str.to_charp(), str.strlen()); }
void seek(off_t offset, int whence = SEEK_SET) { rseek(offset, whence); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
off_t tell() { return rtell(); }
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual off_t getSize();
virtual time_t getMTime();
ssize_t forceRead(void * buf, size_t count, Events::BaseEvent * evt = NULL) throw (GeneralException);
ssize_t forceWrite(const void * buf, size_t count, Events::BaseEvent * evt = NULL) throw (GeneralException);
protected:
Handle() : m_refCount(0) { }
private:
void addRef() { m_refCount++; }
void delRef() {
if (--m_refCount == 0) {
if (!isClosed())
close();
delete this;
}
}
friend class IOBase;
template<class T>
friend class IO;
int m_refCount;
};
class IOBase {
public:
IOBase() : m_h(NULL) { }
~IOBase() { if (m_h) m_h->delRef(); }
protected:
void setHandle(Handle * h) { m_h = h; if (m_h) m_h->addRef(); }
Handle * m_h;
template<class T>
friend class IO;
};
template<class T>
class IO : public IOBase {
public:
IO() { }
IO(T * h) { setHandle(h); }
IO(const IO<T> & io) { if (io.m_h) setHandle(io.m_h); }
template<class U>
IO(const IO<U> & io) { if (io.m_h) setHandle(io.m_h); }
IO<T> & operator=(const IO<T> & io) { if (m_h) m_h->delRef(); setHandle(io.m_h); return *this; }
T * operator->() { Assert(m_h); T * r = dynamic_cast<T *>(m_h); Assert(r); return r; }
bool isNull() { return dynamic_cast<T *>(m_h); }
};
class SeekableHandle : public Handle {
public:
SeekableHandle() : m_wOffset(0), m_rOffset(0) { }
virtual bool canSeek();
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual bool isEOF();
protected:
off_t getWOffset() { return m_wOffset; }
off_t getROffset() { return m_rOffset; }
private:
off_t m_wOffset, m_rOffset;
};
class ReadOnly {
public:
ReadOnly(IO<Handle> & io) : m_io(io) { Assert(m_io->canRead()); }
virtual void close() throw (GeneralException) { m_io->close(); }
virtual bool isClosed() { return m_io->isClosed(); }
virtual bool isEOF() { return m_io->isEOF(); }
virtual bool canSeek() { return m_io->canSeek(); }
virtual bool canRead() { return true; }
virtual bool canWrite() { return false; }
virtual const char * getName() { return m_io->getName(); }
virtual ssize_t read(void * buf, size_t count) throw (GeneralException) { return m_io->read(buf, count); }
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException) { throw GeneralException("Can't write"); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { m_io->rseek(offset, whence); }
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { throw GeneralException("Can't write"); }
virtual off_t rtell() throw (GeneralException) { return m_io->rtell(); }
virtual off_t wtell() throw (GeneralException) { throw GeneralException("Can't write"); }
virtual off_t getSize() { return m_io->getSize(); }
virtual time_t getMTime() { return m_io->getMTime(); }
private:
IO<Handle> m_io;
};
class WriteOnly {
public:
WriteOnly(IO<Handle> & io) : m_io(io) { Assert(m_io->canWrite()); }
virtual void close() throw (GeneralException) { m_io->close(); }
virtual bool isClosed() { return m_io->isClosed(); }
virtual bool isEOF() { return m_io->isEOF(); }
virtual bool canSeek() { return m_io->canSeek(); }
virtual bool canRead() { return false; }
virtual bool canWrite() { return true; }
virtual const char * getName() { return m_io->getName(); }
virtual ssize_t read(void * buf, size_t count) throw (GeneralException) { throw GeneralException("Can't read"); }
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException) { return m_io->write(buf, count); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { throw GeneralException("Can't read"); }
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { return m_io->wseek(offset, whence); }
virtual off_t rtell() throw (GeneralException) { throw GeneralException("Can't read"); }
virtual off_t wtell() throw (GeneralException) { return m_io->wtell(); }
virtual off_t getSize() { return m_io->getSize(); }
virtual time_t getMTime() { return m_io->getMTime(); }
private:
IO<Handle> m_io;
};
};
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