mhistory.class

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<?php
 
class MStackHistory
{
    var $limit = 10;
    var $name;
    var $base = 0;
    var $top;
    var $stack;
 
    function __construct($name)
    {
        global $MIOLO, $$name;
 
        $this->name = $name;
        $s = $MIOLO->GetSession()->getValue($name);
        if ($s == NULL)
        {
            $this->top = -1;
            $this->stack = array();
        }
        else
        {
            $this->top = count($s) - 1;
            $this->stack = $s;
        }
    }
 
    function Push($value)
    {
        if (++$this->top > $this->limit)
        {
            ++$this->base;
        }
        $this->stack[$this->top] = $value;
    }
 
    function Pop()
    {
        $value = $this->stack[$this->top];
        if (--$this->top < $this->base)
        { 
            $this->top = $this->base;
        } 
        return $value;
    }
 
    function Top($offset = 0)
    {
        $n = $this->top - $offset;
        return ($n >= $this->base) ? $this->stack[$n] : NULL;
    }
 
    function Count()
    {
        return $this->top - $this->base + 1;
    }
 
    function Save()
    {
        global $MIOLO;
 
        $this->stack = array_slice($this->stack, $this->base, $this->Count());
        $this->top = $this->Count() - 1;
        $MIOLO->GetSession()->setValue($this->name, $this->stack);
    }
}
 
class MHistory extends MService
{
    var $stackContext;
    var $stackHistory;
    var $context;
 
    function __construct($manager)
    {
        parent::__construct();
        $this->context = new StdClass;
        $this->stackContext = new MStackHistory('_stackContext');
        $this->stackHistory = new MStackHistory('_stackAction');
        if ($this->stackContext->Count() == 0)
        {
            $this->context->action = '';
        }
        else
        { 
            $this->context = new MContext($this->stackContext->Top());
        }
        $this->Push($this->manager->GetCurrentUrl());
    }
 
    function Push($action)
    {
        $this->stackHistory->Push($action);
        $context = new MContext($action);
        $this->stackContext->Push($context->ComposeURL($this->manager->dispatch));
    }
 
    function Pop($stack = NULL)
    {
        if (is_null($stack) || ($stack == 'action'))
        {
            $this->stackHistory->Pop();
        }
        if (is_null($stack) || ($stack == 'context'))
        {
            $this->stackContext->Pop();
        }
    }
 
    function Top($stack = 'action')
    {
        if ($stack == 'action')
        {
            return $this->stackHistory->Top();
        }
        elseif ($stack == 'context')
        {
            return $this->stackContext->Top();
        }
    }
 
    function Back($stack = 'action')
    {
        if ($stack == 'action')
        {
            return $this->stackHistory->Top(1);
        }
        elseif ($stack == 'context')
        {
            return $this->stackContext->Top(1);
        }
    }
 
    function Close()
    {
        $this->stackContext->Save();
        $this->stackHistory->Save();
    }
}
?>