Java Code Examples for org.eclipse.xtext.xbase.lib.Functions#Function1

@Test public void testBug362236_02() throws Exception {
	String code = 
			"import java.util.List\n" +
			"class Z {\n"+
			"    def returnClosure() {  \n" + 
			"      thing(Integer i|i.toString)\n" + 
			"    }\n" + 
			"    def thing(Object o) {" +
			"      o\n" + 
			"    }\n" +
			"}";
	String javaCode = compileToJavaCode(code);
	Class<?> class1 = compileToClass("Z", javaCode);
	Object object = class1.getDeclaredConstructor().newInstance();
	Object closure = class1.getDeclaredMethod("returnClosure").invoke(object);
	@SuppressWarnings("unchecked")
	Functions.Function1<Object, Object> castedClosure = (Function1<Object, Object>) closure;
	assertEquals("123", castedClosure.apply(123));
}
 

@Test public void testFindLast_exceptionInFilter() {
	final RuntimeException expectedException = new RuntimeException();
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			throw expectedException;
		}
	};
	for(IterableOrIterator testMe: testData(first, second, third)) {
		try {
			findLast(testMe, filter);
			fail("expected exception");
		} catch(RuntimeException e) {
			assertSame(expectedException, e);
		}
	}
}
 

@Test public void testBug362236_03() throws Exception {
	String code = 
			"import java.util.List\n" +
			"class Z {\n"+
			"    def returnClosure() {  \n" + 
			"      thing(i|i.toString)\n" + 
			"    }\n" + 
			"    def thing((Object)=>Object o) {" +
			"      o\n" + 
			"    }\n" +
			"}";
	String javaCode = compileToJavaCode(code);
	Class<?> class1 = compileToClass("Z", javaCode);
	Object object = class1.getDeclaredConstructor().newInstance();
	Object closure = class1.getDeclaredMethod("returnClosure").invoke(object);
	@SuppressWarnings("unchecked")
	Functions.Function1<Object, Object> castedClosure = (Function1<Object, Object>) closure;
	assertEquals("123", castedClosure.apply(123));
}
 

@Test public void testFindLast_oneMatch() {
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			return second.equals(p);
		}
	};
	for(IterableOrIterator testMe: testData(first, second, third)) {
		Integer last = findLast(testMe, filter);
		assertEquals(second, last);
	}
}
 

@Test public void testFindLast_allMatches() {
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			return true;
		}
	};
	for(IterableOrIterator testMe: testData(first, second, third)) {
		Integer last = findLast(testMe, filter);
		assertEquals(third, last);
	}
}
 

@Test public void testFindFirst_oneMatch() {
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			return second.equals(p);
		}
	};
	for(IterableOrIterator testMe: testData(first, second, third)) {
		Integer last = findFirst(testMe, filter);
		assertEquals(second, last);
	}
}
 

@Test public void testFindLast_exceptionInFilter_emptyInput() {
	final RuntimeException expectedException = new RuntimeException();
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			throw expectedException;
		}
	};
	for(IterableOrIterator testMe: testData()) {
		Integer last = findLast(testMe, filter);
		assertEquals(null, last);
	}
}
 

@Test public void testFindLast_noMatch() {
	Function1<Integer, Boolean> filter = new Functions.Function1<Integer, Boolean>() {
		@Override
		public Boolean apply(Integer p) {
			return false;
		}
	};
	for(IterableOrIterator testMe: testData(first, second, third)) {
		Integer last = findLast(testMe, filter);
		assertNull("unmatched input yields null", last);
	}
}
 

public <Obj> Functions.Function1<Obj, Obj> getIdentityFunction() {
	return new Functions.Function1<Obj, Obj>() {
		@Override
		public Obj apply(Obj p) {
			return p;
		}
		
	};
}
 

@Test public void testFlatMap () {
	ArrayList<String> list = newArrayList("foo", "bar");
	
	final Functions.Function1<String, Iterator<String>> function = new Functions.Function1<String, Iterator<String>>() {
		@Override
		public Iterator<String> apply(String p) {
			return newArrayList("Hello", p).iterator();
		}
	};
	assertEquals(newArrayList("Hello", "foo", "Hello", "bar"), newArrayList(IteratorExtensions.flatMap(list.iterator(), function)));
}
 

public <P,T> T invoke1WithExtends(Functions.Function1<P, ? extends T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1(Functions.Function1<P, T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1WithExtends(Functions.Function1<P, ? extends T> fun, P p1) {
	return fun.apply(p1);
}
 

@SuppressWarnings("unchecked")
public <RT, T> Functions.Function1<T, RT> createFunction(String body,
		Class<RT> returnType, Class<T> paramType) {
	return (Functions.Function1<T, RT>) internalCreateFunction(body,
			returnType, Tuples.pair((Type) paramType, "p"));
}
 

public <P,T> T invoke1WithSuperAndExtends(Functions.Function1<? super P,? extends T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1WithSuper(Functions.Function1<? super P,T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1WithSuper(Functions.Function1<? super P,T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1(Functions.Function1<P, T> fun, P p1) {
	return fun.apply(p1);
}
 

public <P,T> T invoke1WithSuperAndExtends(Functions.Function1<? super P,? extends T> fun, P p1) {
	return fun.apply(p1);
}
 

protected abstract IterableOrIterator takeWhile(IterableOrIterator input, Functions.Function1<Integer, Boolean> filter);