Edge.C

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 * This library is free software; you can redistribute it and/or
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 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
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 */

// Edge class implementation

#include "Graph.h"
#include "Edge.h"
#include "Node.h"
#include <assert.h>

// Edges are quite simple. The only things we need to implement are:
// * Factory method
// * Constructors

using namespace Dyninst;

Edge::Ptr Edge::createEdge(const NodeSharedPtr source,
                           const NodeSharedPtr target) {
    // We take shared_ptrs as inputs and pull out a weak_ptr
    // to use internally.

    NodePtr s(source);
    NodePtr t(target);

    return Edge::Ptr(new Edge(s, t));
}

// Default constructor; DON'T USE THIS

Edge::Edge() {
    // Impossible to use
    assert(0);
}

// Constructor
Edge::Edge(const NodePtr source, const NodePtr target) :
    source_(source), target_(target) {}

///////////////////////////////////////////////////////////////
// Edge iterator "implementation". The iterator just wraps an
// internal implementation, so this code is pretty much 
// boilerplate...
///////////////////////////////////////////////////////////////

// Prefix...
EdgeIterator &EdgeIterator::operator++() {
    if (!iter_) return *this;
    
    iter_->inc();
    return *this;
}

// Postfix...
EdgeIterator EdgeIterator::operator++(int) {
    EdgeIterator ret = *this;
    ++(*this);
    return ret;    
}


Edge::Ptr EdgeIterator::operator*() const {
    if (!iter_) return Edge::Ptr();

    return iter_->get();
}

bool EdgeIterator::operator!=(const EdgeIterator &rhs) const {
    if (!iter_) {
        return (rhs.iter_ != NULL);
    }
    return !iter_->equals(rhs.iter_);
}

bool EdgeIterator::operator==(const EdgeIterator &rhs) const {
    if (!iter_) {
        return (rhs.iter_ == NULL);
    }
    return iter_->equals(rhs.iter_);
}

EdgeIterator &EdgeIterator::operator=(const EdgeIterator &rhs) {
    if (rhs.iter_ == NULL) {
        if (iter_) delete iter_; // No leaking!
        iter_ = rhs.iter_; 
        return *this;
    }
    else {
        // We don't want just the pointer, as that would really
        // make the two iterators work the same. That's bad. 
        iter_ = rhs.iter_->copy();
        return *this;
    }
}

EdgeIterator::~EdgeIterator() {
    if (iter_) delete iter_;
}

EdgeIterator::EdgeIterator(const EdgeIterator &rhs) {
    if (rhs.iter_ == NULL) {
        iter_ = NULL;
    }
    else
        iter_ = rhs.iter_->copy();
}