@Test
public void testAdd() {
final DependencyBuilder<String> db = new DependencyBuilder<String>();
try {
db.add(null, DI.constantly("", String.class));
fail("null key should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
try {
db.add("absent", null);
fail("null source should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
// adding source first time should work fine
db.add("foo", DI.constantly(10, String.class));
// repeated adding of source for same key should fail
try {
db.add("foo", DI.constantly(20, String.class));
fail("Duplicating adding of source for same key should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
}
@Test
public void testAddFactory() {
final DependencyBuilder<String> db = new DependencyBuilder<String>();
try {
db.addFactory(null, DI.constantly("", String.class));
fail("null key should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
try {
db.addFactory("absent", null);
fail("null source should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
final IComponentSource<Integer, String> counterSource =
new IComponentSource<Integer, String>() {
int c = 0;
@Override
public Integer get(Map<String, IComponentSource<?, String>> dependencies) {
return c++;
}
};
db.addFactory("counter", counterSource);
try {
db.addFactory("counter2", DI.singleton(counterSource));
fail("Singleton cannot be added as factory");
} catch (IllegalArgumentException e) {
// do nothing
}
}
@Test
public void testAddConstant() {
final DependencyBuilder<String> db = new DependencyBuilder<String>();
try {
db.addConstant(null, DI.constantly("", String.class));
fail("null key should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
// null value should work fine
db.addConstant("absent", null);
// ordinary object should work fine
db.addConstant("present", 100);
final IComponentSource<Integer, String> counterSource =
new IComponentSource<Integer, String>() {
int c = 0;
@Override
public Integer get(Map<String, IComponentSource<?, String>> dependencies) {
return c++;
}
};
try {
db.addConstant("counter", counterSource);
fail("Component sources cannot be added as constant");
} catch (IllegalArgumentException e) {
// do nothing
}
}
@Test
public void testAddSingleton() {
final DependencyBuilder<String> db = new DependencyBuilder<String>();
try {
db.addSingleton(null, DI.constantly("", String.class));
fail("null key should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
try {
db.addSingleton("absent", null);
fail("null source should be rejected");
} catch (IllegalArgumentException e) {
// do nothing
}
final IComponentSource<Integer, String> counterSource =
new IComponentSource<Integer, String>() {
int c = 0;
@Override
public Integer get(Map<String, IComponentSource<?, String>> dependencies) {
return c++;
}
};
Map<String, IComponentSource<?, String>> deps =
new MapBuilder<String, IComponentSource<?, String>>().add("counter", counterSource).get();
// factory returns a new value on each call
assertEquals(new Integer(0), DI.getInstance(deps, "counter", Integer.class));
assertEquals(new Integer(1), DI.getInstance(deps, "counter", Integer.class));
// singleton returns the same cached value that is generated once
db.addSingleton("counter", counterSource);
assertEquals(new Integer(2), db.getInstance("counter", Integer.class));
assertEquals(new Integer(2), db.getInstance("counter", Integer.class));
// adding a singleton as singleton should also work fine
final IComponentSource<?, String> singleton = DI.singleton(counterSource);
db.addSingleton("counter2", singleton);
}