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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.pooling.extractor;
import java.lang.reflect.Field;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Used to extract an object stored in one of the container's fields.
*/
public class FieldExtractor implements Extractor {
private static final Logger logger = LoggerFactory.getLogger(FieldExtractor.class);
/**
* Field containing the object.
*/
private final Field field;
/**
*
* @param field field containing the object
*/
public FieldExtractor(Field field) {
this.field = field;
}
@Override
public Object extract(Object object) {
try {
return field.get(object);
} catch (IllegalAccessException | IllegalArgumentException e) {
logger.warn("cannot get {} from {}", field.getName(), object.getClass(), e);
return null;
}
}
}
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