com.github.guava.JoinerPractice.java Source code

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Here is the source code for com.github.guava.JoinerPractice.java

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/*
 * Copyright (C) 2009 The doctor Authors
 * https://github.com/doctorwho1986
 *
 * 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 com.github.guava;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import com.google.common.base.Joiner;

/**
 * @author doctor
 *
 * @date 2014825 ?8:04:28
 */
public class JoinerPractice {

    private String[] str = { "aa", "bb", "abc" };
    @Rule
    public ExpectedException thrown = ExpectedException.none();

    @Test
    public void test() {
        String join = Joiner.on('|').skipNulls().join(str);
        Assert.assertEquals(StringUtils.join(str, '|'), join);
    }

    @Test
    public void test_null() {
        thrown.expect(NullPointerException.class);
        Joiner.on(",").join("dj", null);
    }

    @Test
    public void test_map() {
        Map<String, String> map = new HashMap<String, String>();
        map.put("name", "doctor");
        map.put("address", "");
        String join = Joiner.on("#").withKeyValueSeparator("=").join(map);

        Assert.assertEquals(mapJoinWith(map, "=", "#"), join);
    }

    private String mapJoinWith(Map<?, ?> map, String keyValueSeparator, String separator) {
        StringBuffer stringBuffer = new StringBuffer();
        for (Object key : map.keySet()) {
            stringBuffer.append(key).append(keyValueSeparator).append(map.get(key)).append(separator);
        }
        stringBuffer.setLength(stringBuffer.length() - separator.length());
        return stringBuffer.toString();
    }

}