ExpediaGroup / bull / #1032

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/bull-bean-transformer/src/main/java/com/expediagroup/beans/populator/OptionalPopulator.java
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/**
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 * Copyright (C) 2019-2023 Expedia, Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.expediagroup.beans.populator;
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import static java.util.Optional.ofNullable;










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import java.lang.reflect.Field;










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import java.util.Optional;










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import com.expediagroup.beans.transformer.BeanTransformer;










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/**










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 * Populator for {@link Optional} type.










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 */










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class OptionalPopulator extends Populator<Object> {










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    /**










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     * Default constructor.










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     * @param beanTransformer the bean transformer containing the field name mapping and transformation functions










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     */










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    OptionalPopulator(final BeanTransformer beanTransformer) {










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        super(beanTransformer);




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    }




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    /**










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     * {@inheritDoc}










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     */










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    @Override










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    public Object getPopulatedObject(final Field field, final Object fieldValue) {










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        Object res = null;




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        var optionalFieldValue = (Optional) fieldValue;




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        if (optionalFieldValue.isPresent()) {




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            res = transform(optionalFieldValue.get(), field.getType());




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        }










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        // if the field type in the target class is not an optional it puts the value inside an optional










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        if (field.getType() == Optional.class) {




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            res = ofNullable(res);




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        }










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        return res;




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    }










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}
























    

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