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API CHANGE: Added DataDifferencer, for comparing data objects (merged from r77658)

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git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@77659 467b73ca-7a2a-4603-9d3b-597d59a354a9
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Sam Minnee 2009-05-23 03:28:18 +00:00
parent bb5eff8bed
commit 82f803601a
1 changed files with 87 additions and 0 deletions
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core/model/DataDifferencer.php Normal file
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<?php
/**
* Utility class to render views of the differences between two data objects (or two versions of the
* same data object).
*
* Construcing a diff object is done as follows:
* <code>
* $fromRecord = Versioned::get_version('SiteTree', $pageID, $fromVersion);
* $toRecord = Versioned::get_version('SiteTree, $pageID, $toVersion);
* $diff = new DataDifferencer($fromRecord, $toRecord);
* </code>
*
* And then it can be used in a number of ways. You can use the ChangedFields() method in a template:
* <pre>
* <dl class="diff">
* <% control Diff.ChangedFields %>
* <dt>$Title</dt>
* <dd>$Diff</dd>
* <% end_control %>
* </dl>
* </pre>
*
* Or you can get the diff'ed content as another DataObject, that you can insert into a form.
* <code>
* $form->loadDataFrom($diff->diffedData());
* </code>
*
* If there are fields whose changes you aren't interested in, you can ignore them like so:
* <code>
* $diff->ignoreFields('AuthorID', 'Status');
* </code>
*/
class DataDifferencer extends ViewableData {
protected $fromRecord;
protected $toRecord;
protected $ignoredFields = array("ID","Version","RecordID");
function __construct($fromRecord, $toRecord) {
$this->fromRecord = $fromRecord;
$this->toRecord = $toRecord;
}
/**
* Specify some fields to ignore changes from. Repeated calls are cumulative.
* @param $ignoredFields An array of field names to ignore. Alternatively, pass the field names as
* separate args.
*/
function ignoreFields($ignoredFields) {
if(!is_array($ignoredFields)) $ignoredFields = func_get_args();
$this->ignoredFields = array_merge($this->ignoredFields, $ignoredFields);
}
function diffedData() {
$diffed = clone $this->fromRecord;
$fields = array_keys($diffed->getAllFields());
foreach($fields as $field) {
if(in_array($field, $this->ignoredFields)) continue;
if($this->fromRecord->$field != $this->toRecord->$field) {
$diffed->$field = Diff::compareHTML($this->fromRecord->$field, $this->toRecord->$field);
}
}
return $diffed;
}
function ChangedFields() {
$changedFields = new DataObjectSet();
$fields = array_keys($this->fromRecord->getAllFields());
foreach($fields as $field) {
if(in_array($field, $this->ignoredFields)) continue;
if($this->fromRecord->$field != $this->toRecord->$field) {
$changedFields->push(new ArrayData(array(
'Title' => $this->fromRecord->fieldLabel($field),
'Diff' => Diff::compareHTML($this->fromRecord->$field, $this->toRecord->$field),
)));
}
}
return $changedFields;
}
}