/**
* Gets a tree
*
* @param string $hash tree hash
* @return GitPHP_Tree tree object
*/
public function GetTree($hash)
{
if (empty($hash)) {
return null;
}
if (preg_match('/^[0-9A-Fa-f]{4,39}$/', $hash) && !$this->compat) {
$fullHash = $this->project->ExpandHash($hash);
if ($fullHash == $hash) {
throw new GitPHP_InvalidHashException($hash);
}
$hash = $fullHash;
}
if (!preg_match('/^[0-9A-Fa-f]{40}$/', $hash)) {
return null;
}
$key = GitPHP_Tree::CacheKey($this->project->GetProject(), $hash);
$tree = null;
if ($this->memoryCache) {
$tree = $this->memoryCache->Get($key);
}
if (!$tree) {
if ($this->cache) {
$tree = $this->cache->Get($key);
}
$strategy = null;
if ($this->compat) {
$strategy = new GitPHP_TreeLoad_Git($this->exe);
} else {
$strategy = new GitPHP_TreeLoad_Raw($this->objectLoader, $this->exe);
}
if ($tree) {
$tree->SetProject($this->project);
$tree->SetStrategy($strategy);
} else {
$tree = new GitPHP_Tree($this->project, $hash, $strategy);
}
$tree->AddObserver($this);
if ($this->memoryCache) {
$this->memoryCache->Set($key, $tree);
}
}
return $tree;
}
