SplitterExample.java

package com.levelup.java.guava;

import static org.junit.Assert.assertEquals;

import java.util.List;
import java.util.Map;

import org.junit.Test;

import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;

/**
 * This java example will demonstrate examples of 
 * Google Guava Splitter
 * 
 * @author Justin Musgrove
 * @see <a href='http://www.leveluplunch.com/java/examples/guava-splitter-example/'>Splitter example</a>
 * 
 */
public class SplitterExample {

	@Test
	public void split_string_to_list_using_delimiter () {
		
		List<String> oakTrees =  
			Splitter.on(',')
				.trimResults()
				.omitEmptyStrings()
				.splitToList("Granit Oak, Bartek, Gernikako Arbola, "
						+ "Queen Elizabeth Oak, Kongeegen (the King Oak), "
						+ "Chêne chapelle, Poltava Oak,,,");
		
		assertEquals(7, oakTrees.size());
	}
	
	@Test
	public void split_string_to_list_using_charmatchers () {

		List<String> abcs123s = Splitter.on(CharMatcher.anyOf(";,.)"))
				.trimResults()
				.omitEmptyStrings()
				.splitToList("a,b;c.d,e.f),g,h.i;j.1,2.3;4.5,6;7.8,9;0");
		
		assertEquals(20, abcs123s.size());	
	}
	
	@Test
	public void split_string_using_regular_expresion () {
		
		List<String> splitOnLetter = Splitter
				.onPattern("a|b")
				.splitToList("12312a31231b23123");

		assertEquals(3, splitOnLetter.size());
	}
	
	@Test
	public void split_string_to_list_using_fix_length () {
		
		List<String> digits = Splitter
				.fixedLength(1)
				.splitToList("1234567890");
		
		assertEquals(10, digits.size());
	}
	
	@Test
	public void split_string_to_map () {
		
		String str = "firstName:John , lastName:Doe, age:56, address:1234 Elm Street";
		
		Map<String, String> demographics = Splitter.on(",")
			  .trimResults()
			  .withKeyValueSeparator(":")
			  .split(str);
		
		assertEquals(4, demographics.size());
	}
	
	
}