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DiffusionExistsQueryConduitAPIMethod.php
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			<?php

			final class DiffusionExistsQueryConduitAPIMethod
			extends DiffusionQueryConduitAPIMethod {

			public function getAPIMethodName() {
			return 'diffusion.existsquery';
			}

			public function getMethodDescription() {
			return pht('Determine if code exists in a version control system.');
			}

			protected function defineReturnType() {
			return 'bool';
			}

			protected function defineCustomParamTypes() {
			return array(
			'commit' => 'required string',
			);
			}

			protected function getGitResult(ConduitAPIRequest $request) {
			$repository = $this->getDiffusionRequest()->getRepository();
			$commit = $request->getValue('commit');
			list($err, $merge_base) = $repository->execLocalCommand(
			'cat-file -t -- %s',
			$commit);
			return !$err;
			}

			protected function getSVNResult(ConduitAPIRequest $request) {
			$repository = $this->getDiffusionRequest()->getRepository();
			$commit = $request->getValue('commit');

			$refs = id(new DiffusionCachedResolveRefsQuery())
			->setRepository($repository)
			->withRefs(array($commit))
			->execute();

			return (bool)$refs;
			}

			protected function getMercurialResult(ConduitAPIRequest $request) {
			$repository = $this->getDiffusionRequest()->getRepository();
			$commit = $request->getValue('commit');
			list($err, $stdout) = $repository->execLocalCommand(
			'id --rev %s',
			hgsprintf('%s', $commit));
			return !$err;
			}

			}