/*
 * Copyright 2013 Takao Nakaguchi
 *
 * 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 org.trie4j.util;

import java.util.AbstractSet;
import java.util.Iterator;

import org.trie4j.Trie;

public class TrieSet extends AbstractSet<String>{
	public TrieSet(Trie trie) {
		this.trie = trie;
	}

	@Override
	public boolean add(String e) {
		int prev = trie.size();
		trie.insert(e);
		return prev != trie.size();
	}

	@Override
	public Iterator<String> iterator() {
		return trie.commonPrefixSearch("").iterator();
	}

	@Override
	public int size() {
		return trie.size();
	}

	private Trie trie;
}