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<?php | |
/** | |
* Copyright 2019 University of Liverpool | |
* | |
* 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. | |
*/ | |
namespace pgb_liv\php_ms\Utility\Fragment; | |
use pgb_liv\php_ms\Constant\ChemicalConstants; | |
/** | |
* Generates the A ions from a peptide | |
* | |
* @author Andrew Collins | |
*/ | |
class AFragment extends AbstractFragment implements FragmentInterface | |
{ | |
/** | |
* | |
* {@inheritdoc} | |
*/ | |
protected function getAdditiveMass() | |
{ | |
// H - CHO | |
return ChemicalConstants::HYDROGEN_MASS - (ChemicalConstants::CARBON_MASS + ChemicalConstants::HYDROGEN_MASS + ChemicalConstants::OXYGEN_MASS); | |
} | |
} |