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A library for core classes (Graph, Vertex, Edge, etc.)

There is a newer version: 2.11.0

package io.konig.core.impl;

/*
 * #%L
 * Konig Core
 * %%
 * Copyright (C) 2015 - 2016 Gregory McFall
 * %%
 * 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.
 * #L%
 */


import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.openrdf.model.URI;

import io.konig.core.LocalNameService;

public class CompositeLocalNameService implements LocalNameService {
	
	private static final Set EMPTY = new HashSet<>();

	private List list = new ArrayList<>();
	
	public CompositeLocalNameService(LocalNameService...service) {
		for (LocalNameService s : service) {
			add(s);
		}
	}
	
	public void add(LocalNameService service) {
		list.add(service);
	}

	@Override
	public Set lookupLocalName(String localName) {
		for (LocalNameService service : list) {
			Set result = service.lookupLocalName(localName);
			if (result != null && !result.isEmpty()) {
				return result;
			}
		}
		return EMPTY;
	}
	


}