DifferentialFieldDataNotAvailableException.php
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DifferentialFieldDataNotAvailableException.php
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			<?php

			/*
			* Copyright 2011 Facebook, Inc.
			*
			* Licensed under the Apache License, Version 2.0 (the "License");
			* you may not use this file except in compliance with the License.
			* You may obtain a copy of the License at
			*
			* http://www.apache.org/licenses/LICENSE-2.0
			*
			* Unless required by applicable law or agreed to in writing, software
			* distributed under the License is distributed on an "AS IS" BASIS,
			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			* See the License for the specific language governing permissions and
			* limitations under the License.
			*/

			final class DifferentialFieldDataNotAvailableException extends Exception {

			public function __construct(DifferentialFieldSpecification $spec) {
			$key = $spec->getStorageKey();
			$class = get_class($spec);

			parent::__construct(
			"Differential field specification for '{$key}' (of class '{$class}') is ".
			"attempting to access data which is not available in this context.");
			}

			}