/*
* 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.ambari.server.collections.functors;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.apache.ambari.server.collections.Predicate;
/**
* {@link PredicateClassFactory} is a factory class used to derive a {@link Predicate} implementation
* class from its name.
*/
public class PredicateClassFactory {
/**
* A static map of names to {@link Class}s.
*/
private static final Map<String, Class<? extends Predicate>> NAME_TO_CLASS;
static {
Map<String, Class<? extends Predicate>> map = new HashMap<>();
map.put(AndPredicate.NAME, AndPredicate.class);
map.put(OrPredicate.NAME, OrPredicate.class);
map.put(NotPredicate.NAME, NotPredicate.class);
map.put(ContainsPredicate.NAME, ContainsPredicate.class);
map.put(EqualsPredicate.NAME, EqualsPredicate.class);
NAME_TO_CLASS = Collections.unmodifiableMap(map);
}
/**
* Return a {@link Predicate} implementation class give its name
*
* @param name the name of a {@link Predicate} implementation
* @return a {@link Predicate} implementation class give its name or <code>null</code> is not found
*/
public static Class<? extends Predicate> getPredicateClass(String name) {
return (name == null) ? null : NAME_TO_CLASS.get(name);
}
}