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HeraldCommentContentField.php
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			<?php

			final class HeraldCommentContentField extends HeraldField {

			const FIELDCONST = 'comment.content';

			public function getHeraldFieldName() {
			return pht('Comment content');
			}

			public function getFieldGroupKey() {
			return HeraldTransactionsFieldGroup::FIELDGROUPKEY;
			}

			public function getHeraldFieldValue($object) {
			$adapter = $this->getAdapter();

			$xactions = $adapter->getAppliedTransactions();

			$result = array();
			foreach ($xactions as $xaction) {
			if (!$xaction->hasComment()) {
			continue;
			}

			$comment = $xaction->getComment();
			$content = $comment->getContent();

			$result[] = $content;
			}

			return $result;
			}

			public function supportsObject($object) {
			return true;
			}

			protected function getHeraldFieldStandardType() {
			return self::STANDARD_TEXT_LIST;
			}

			}