72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// //
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// File: filter.h //
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// Description: base classes for chained data processors //
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// Project: WANProxy XTech //
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// Author: Andreu Vidal Bramfeld-Software //
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// Last modified: 2016-02-28 //
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// //
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////////////////////////////////////////////////////////////////////////////////
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#ifndef COMMON_FILTER_H
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#define COMMON_FILTER_H
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#include <list>
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#include <common/log.h>
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#include <common/buffer.h>
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class Filter
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{
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private:
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Filter* recipient_;
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public:
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Filter () { recipient_ = 0; }
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virtual ~Filter () { }
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void chain (Filter* nxt) { recipient_ = nxt; }
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virtual bool consume (Buffer& buf, int flg = 0) { return produce (buf, flg); }
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virtual bool produce (Buffer& buf, int flg = 0) { return (recipient_ && recipient_->consume (buf, flg)); }
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virtual void flush (int flg) { if (recipient_) recipient_->flush (flg); }
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};
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class BufferedFilter : public Filter
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{
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protected:
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LogHandle log_;
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Buffer pending_;
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bool flushing_;
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int flush_flags_;
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public:
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BufferedFilter (const LogHandle& log) : log_ (log) { flushing_ = 0; flush_flags_ = 0; }
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};
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class LogisticFilter : public BufferedFilter
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{
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protected:
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Filter* upstream_;
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public:
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LogisticFilter (const LogHandle& log) : BufferedFilter (log) { upstream_ = 0; }
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void set_upstream (Filter* f) { upstream_ = f; }
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};
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class FilterChain : public Filter
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{
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private:
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std::list<Filter*> nodes_;
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Filter* holder_;
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public:
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FilterChain (Filter* f) { holder_ = f; }
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virtual ~FilterChain () { while (! nodes_.empty ()) { delete nodes_.front (); nodes_.pop_front (); }}
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void prepend (Filter* f) { Filter* act = (nodes_.empty () ? holder_ : nodes_.front ());
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if (f && act) nodes_.push_front (f), chain (f), f->chain (act); }
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void append (Filter* f) { Filter* act = (nodes_.empty () ? this : nodes_.front ());
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if (f && act) nodes_.push_front (f), act->chain (f), f->chain (holder_); }
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virtual void flush (int flg) { if (nodes_.empty ()) chain (holder_); Filter::flush (flg); }
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};
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#endif /* !COMMON_FILTER_H */
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