原创

PHP的Collection集合类

<?php
header("Content-type:text/html; charset=utf-8");

class Collection{
private $_members=array();
private $_onload;
private $_isLoaded=false;

public function startLoad(){
$this->_checkCallback();
}

public function addItem($obj,$key=NULL){
$this->_checkCallback();
if($key){
if(isset($this->_members[$key])){
throw new Exception("Key \\"$key\\" already in use!");
}else{
$this->_members[$key]=$obj;
}
}else{
$this->_members[]=$obj;
}
}

public function removeItem($key){
$this->_checkCallback();
if(isset($this->_members[$key])){
unset($this->_members[$key]);
}else{
throw new Exception("Invalid key \\"$key\\"!");
}
}

public function getItem($key){
$this->_checkCallback();
if(isset($this->_members[$key])){
return $this->_members[$key];
}else{
throw new Exception("Invalid key \\"$key\\"!");
}
}

public function keys(){
$this->_checkCallback();
return array_keys($this->_members);
}

public function length(){
$this->_checkCallback();
return sizeof($this->_members);
}

public function exists($key){
$this->_checkCallback();
return (isset($this->_members[$key]));
}

public function setLoadCallback($functionName,$objOrClass=NULL){
if($objOrClass){
$callback=array($objOrClass,$functionName);
}else{
$callback=$functionName;
}

if(!is_callable($callback)){
/*throw new Exception("$callableName is not callable"."as a parameter to oonload");*/
echo "$callback is not callable<br>";
return false;
}

$this->_onload=$callback;
}

private function _checkCallback(){
if(isset($this->_onload)&&!$this->_isLoaded){
$this->_isLoaded=true;
call_user_func($this->_onload,$this);
}
}
}


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