ValueReplacer.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
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    The above copyright notice and this permission notice shall be included in
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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/**
 * @file ValueReplacer.cc
 *
 * Definition of ValueReplacer class.
 *
 * @author Mikael Lepistö 2003 (tmlepist-no.spam-cs.tut.fi)
 *
 * @note rating: yellow
 */
 
#include <set>
#include <iterator>
 
#include "ValueReplacer.hh"
#include "BinaryStream.hh"
#include "SafePointer.hh"
#include "SafePointable.hh"
#include "Exception.hh"
 
namespace TPEF {
 
std::set<ValueReplacer*> ValueReplacer::replacements_;
BinaryStream* ValueReplacer::stream_ = NULL;
 
/**
 * Constructor
 *
 * @param obj Object whole key is used for replacing bytes in stream.
 */
ValueReplacer::ValueReplacer(const SafePointable* obj) :
    reference_(obj) {
 
    assert(stream_ != NULL);
    assert(obj != NULL);
 
    try {
        streamPosition_ = stream_->writePosition();
    } catch (UnreachableStream e) {
        bool replacerConstructorBadStream = false;
        assert(replacerConstructorBadStream);
    }
}
 
/**
 * Copy constructor
 *
 * @para replacer Replacer which is copied.
 */
ValueReplacer::ValueReplacer(const ValueReplacer& replacer) :
    streamPosition_(replacer.streamPosition_),
    reference_(replacer.reference_) {
}
 
/**
 * Destructor
 */
ValueReplacer::~ValueReplacer() {
}
 
/**
 * Does replacement or set it to be done later.
 *
 * @exception UnreachableStream Writing can't be done, because of bad stream.
 * @exception WritePastEOF If replacer tried to write past end of file.
 */
void
ValueReplacer::resolve() {
    if(!tryToReplace()) {
        addReplacement(clone());
    }
}
 
/**
 * Initializes ValueReplacer for writing.
 *
 * Sets stream which we want write to and clears up key table of reference
 * manager so there won't be any keys with wrong values.
 *
 * @param stream Stream where replacements are done.
 */
void
ValueReplacer::initialize(BinaryStream& stream) {
    stream_ = &stream;
    assert(stream_ != NULL);
    replacements_.clear();
}
 
/**
 * Tries to do those replacement which couldn't do while writing.
 *
 * Deletes all remaining replacer instances after replacements were done.
 * When method is runned and no exceptions are thrown method cleans up
 * key tables of reference manager and unset's BinaryStream where
 * replacements were written. So initilize() method must be called again
 * before starting new writing. If MissingKeys exception is thrown,
 * then those replacements are not freed, which could not be done before.
 * Keys can be added and finalize may be called again.
 *
 * @exception MissingKeys If ReferenceManager doesn't contain needed keys.
 * @exception UnreachableStream Writing can't be done, because of bad stream.
 * @exception WritePastEOF If replacer tried to write past end of file.
 */
void
ValueReplacer::finalize() {
    while (!replacements_.empty()) {
        ValueReplacer* replacer = *(replacements_.begin());
 
        if(!replacer->tryToReplace()) {
            throw MissingKeys(
                __FILE__, __LINE__, __func__,
                "Can't replace object because of missing key.");
        }
 
        delete replacer;
        replacements_.erase(replacer);
    }
 
    stream_ = NULL;
}
 
/**
 * Adds a replacement object for later writing.
 *
 * @param replacer Replacement that should be done later.
 */
void
ValueReplacer::addReplacement(ValueReplacer* replacer) {
  replacements_.insert(replacements_.end(),replacer);
}
 
/**
 * Returns stream where to write.
 *
 * @return Stream where to write reference.
 */
BinaryStream&
ValueReplacer::stream() {
    return *stream_;
}
 
/**
 * Returns referenced object.
 *
 * @return Referenced object.
 */
const SafePointable*
ValueReplacer::reference() const {
    return reference_;
}
 
/**
 * Stream position where to write reference.
 *
 * @return Position where to write reference.
 */
unsigned int
ValueReplacer::streamPosition() const {
    return streamPosition_;
}
 
}