org.apache.dubbo.common.utils.StringConstantFieldValuePredicate Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.common.utils;
import java.lang.reflect.Field;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.lang.reflect.Modifier.isFinal;
import static java.lang.reflect.Modifier.isPublic;
import static java.lang.reflect.Modifier.isStatic;
import static org.apache.dubbo.common.utils.FieldUtils.getFieldValue;
/**
* The constant field value {@link Predicate} for the specified {@link Class}
*
* @see Predicate
* @since 2.7.8
*/
public class StringConstantFieldValuePredicate implements Predicate {
private final Set constantFieldValues;
public StringConstantFieldValuePredicate(Class targetClass) {
this.constantFieldValues = getConstantFieldValues(targetClass);
}
public static Predicate of(Class targetClass) {
return new StringConstantFieldValuePredicate(targetClass);
}
private Set getConstantFieldValues(Class targetClass) {
return Stream.of(targetClass.getFields())
.filter(f -> isStatic(f.getModifiers())) // static
.filter(f -> isPublic(f.getModifiers())) // public
.filter(f -> isFinal(f.getModifiers())) // final
.map(this::getConstantValue)
.filter(v -> v instanceof String) // filters String type
.map(String.class::cast) // Casts String type
.collect(Collectors.toSet());
}
@Override
public boolean test(String s) {
return constantFieldValues.contains(s);
}
private Object getConstantValue(Field field) {
return getFieldValue(null, field);
}
}