111 lines
3.3 KiB
PHP
Executable File
111 lines
3.3 KiB
PHP
Executable File
<?php
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// {{{ICINGA_LICENSE_HEADER}}}
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// {{{ICINGA_LICENSE_HEADER}}}
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namespace Icinga\Backend\DataView;
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/**
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* Class ObjectRemappingView
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*
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* Dataview that maps generic field names to storage specific fields or requests them via handlers.
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*
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* When accessing objects, every storage api returns them with other names. You can't simply say
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* $object->service_state, because this field is, e.g. under status.current_state in the status.dat
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* view, while IDO uses servicestate->current_state.
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*
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* This view is intended for normalizing these changes, so a request of service_state returns the
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* right field for the backend. When implementing it, you have to fill the mappedParameters and/or
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* the handlerParameters array. While mappedParameters simply translate logic field names to
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* storage specific ones, handlerParameters determins functions that handle data retrieval for
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* the specific fields.
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*
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* @package Icinga\Backend\DataView
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*/
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class ObjectRemappingView implements AbstractAccessorStrategy
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{
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/**
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* When implementing your own Mapper, this contains the static mapping rules.
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* @see Icinga\Backend\Statusdat\DataView\StatusdatServiceView for an example
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*
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* @var array
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*/
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protected $mappedParameters = array();
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/**
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* When implementing your own Mapper, this contains the handler for specific fields and allows you to lazy load
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* different fields if necessary. The methods are strings that will be mapped to methods of this class
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*
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* @see Icinga\Backend\Statusdat\DataView\StatusdatServiceView for an example
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*
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* @var array
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*/
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protected $handlerParameters = array();
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/**
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*
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* @see Icinga\Backend\DataView\AbstractAccessorStrategy
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*
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* @param The $item
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* @param The $field
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* @return The|string
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* @throws \InvalidArgumentException
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*/
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public function get(&$item, $field)
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{
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if (isset($item->$field)) {
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return $item->$field;
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}
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if (isset($this->mappedParameters[$field])) {
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$mapped = explode(".", $this->mappedParameters[$field]);
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$res = $item;
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foreach ($mapped as $map) {
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if (!isset($res->$map)) {
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return "";
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}
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$res = $res->$map;
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}
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return $res;
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}
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if (isset($this->handlerParameters[$field])) {
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$hdl = $this->handlerParameters[$field];
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return $this->$hdl($item);
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}
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throw new \InvalidArgumentException("Field $field does not exist for status.dat services");
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}
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/**
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*
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* @see Icinga\Backend\DataView\AbstractAccessorStrategy
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*
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* @param The $field
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* @return The|string
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*/
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public function getNormalizedFieldName($field)
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{
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if (isset($this->mappedParameters[$field])) {
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return $this->mappedParameters[$field];
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}
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return $field;
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}
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/**
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*
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* @see Icinga\Backend\DataView\AbstractAccessorStrategy
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*
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* @param The $item
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* @param The $field
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* @return bool
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*/
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public function exists(&$item, $field)
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{
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return (isset($item->$field)
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|| isset($this->mappedParameters[$field])
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|| isset($this->handlerParameters[$field])
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);
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}
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}
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