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NewStuffInR08Test.java
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NewStuffInR08Test.java
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package com.tfnico.examples.guava;
import static com.google.common.collect.Collections2.filter;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import java.util.Collection;
import java.util.SortedMap;
import java.util.TreeMap;
import org.junit.Test;
import com.google.common.base.Ascii;
import com.google.common.base.CharMatcher;
import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.SortedMaps;
public class NewStuffInR08Test {
@Test
public void makeALineBreakWithAscii(){
System.out.print("Carriage return:");
System.out.print(new String(new byte[] {Ascii.CR} ));
System.out.print("Second line!");
}
@Test
public void filterVowelsInSomeChars() {
CharMatcher vowelMatcher = CharMatcher.anyOf("aeiouy");
assertTrue(vowelMatcher.matches('a'));
ImmutableList<Character> someChars = ImmutableList.of('a','b','c','d','e');
Collection<Character> filter = filter(someChars, vowelMatcher);
ImmutableList<Character> result = ImmutableList.of('a','e');
assertThat(charArray(filter), is(charArray(result)));
}
@Test
public void makeAnIngredientsFromEachSupplier(){
Supplier<Ingredients> factory1 = new IngredientsFactory();
Supplier<Ingredients> factory2 = new IngredientsFactory();
Function<Supplier<Ingredients>, Ingredients> supplierFunction = Suppliers.supplierFunction();
ImmutableList<Supplier<Ingredients>> twoFactories = ImmutableList.of(factory1,factory2);
Collection<Ingredients> twoIngredients = Collections2.transform(twoFactories, supplierFunction);
}
@Test
public void filterAwayNullMapValues() {
SortedMap<String, String> map = new TreeMap<String, String>();
map.put("1","one");
map.put("2","two");
map.put("3",null);
map.put("4","four");
SortedMap<String, String> filtered = SortedMaps.filterValues(map, Predicates.notNull());
assertThat(filtered.size(), is(3)); //null entry for "3" is gone!
}
static Character[] charArray(Collection<Character> filter) {
return filter.toArray(new Character[0]);
}
}