/*
* Copyright 2016-present 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.
*/
package com.facebook.buck.rules.keys;
import java.lang.reflect.Field;
import javax.annotation.Nullable;
/** Extracts a value of a given field, that is assumed to be accessible. */
public class FieldValueExtractor implements ValueExtractor {
private final Field field;
public FieldValueExtractor(Field field) {
this.field = field;
}
@Override
public String getFullyQualifiedName() {
return field.getDeclaringClass() + "." + field.getName();
}
@Override
public String getName() {
return field.getName();
}
@Override
@Nullable
public Object getValue(Object obj) {
try {
return field.get(obj);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}