merger.java

庖丁分词模块

/**
 * Copyright 2007 The Apache Software Foundation
 *
 * 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 net.paoding.analysis.dictionary.support.merging;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.ListIterator;

/**
 * 
 * @author Zhiliang Wang [[e-mail]]
 * 
 * @since 1.0
 * 
 */
public class Merger {

	public static void merge(LinkedList<String> a, LinkedList<String> b) {
		if (b == null) {
			return;
		}
		ListIterator<String> aIter = (ListIterator<String>) a.iterator();
		ListIterator<String> bIter = (ListIterator<String>) b.iterator();
		while (aIter.hasNext() && bIter.hasNext()) {
			String aWord = aIter.next();
			boolean bGoOn = true;
			while (bGoOn && bIter.hasNext()) {
				String bWord = bIter.next();
				int r = bWord.compareTo(aWord);
				if (r == 0) {
					continue;
				}
				if (r < 0) {
					aIter.previous();
					aIter.add(bWord);
					aIter.next();
				} else {
					bIter.previous();
					bGoOn = false;
				}
			}
		}
		while (bIter.hasNext()) {
			a.add(bIter.next());
		}
	}

	public static void remove(LinkedList<String> a, LinkedList<String> b) {
		if (b == null) {
			return;
		}
		ListIterator<String> aIter = (ListIterator<String>) a.iterator();
		ListIterator<String> bIter = (ListIterator<String>) b.iterator();
		while (aIter.hasNext() && bIter.hasNext()) {
			String aWord = aIter.next();
			boolean bGoOn = true;
			while (bGoOn && bIter.hasNext()) {
				String bWord = bIter.next();
				int r = bWord.compareTo(aWord);
				if (r == 0) {
					aIter.remove();
					if (aIter.hasNext()) {
						aWord = aIter.next();
					}
				} else if (r < 0) {
					continue;
				} else {
					bIter.previous();
					bGoOn = false;
				}
			}
		}
	}

	public static void main(String[] args) {
		LinkedList<String> a = new LinkedList<String>();
		LinkedList<String> b = new LinkedList<String>();
		a.add("1");
		a.add("4");
		a.add("a");
		a.add("c");

		b.add("2");
		b.add("3");
		b.add("b");
		b.add("d");
		b.add("太阳");

		Merger.merge(a, b);

		System.out.println(Arrays.toString(a.toArray(new String[] {})));
	}
}