introduce DeactivationFactoryMachine to easily deactivate components

Author: xhanin

restx-factory/src/main/java/restx/factory/DeactivationFactoryMachine.java

@@ -0,0 +1,64 @@
+package restx.factory;
+
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+
+import java.util.Set;
+
+public class DeactivationFactoryMachine implements FactoryMachine {
+
+	public static DeactivationFactoryMachine forNames(Iterable<Name<?>> names) {
+		return new DeactivationFactoryMachine(names);
+	}
+
+	public static DeactivationFactoryMachine forNames(Name<?>... names) {
+		return new DeactivationFactoryMachine(Lists.newArrayList(names));
+	}
+
+	private final ImmutableSet<String> keys;
+
+	public DeactivationFactoryMachine(Iterable<Name<?>> keys) {
+		this.keys = ImmutableSet.copyOf(Iterables.transform(keys, new Function<Name<?>, String>() {
+			@Override
+			public String apply(Name<?> input) {
+				return Factory.activationKey(input.getClazz(), input.getName());
+			}
+		}));
+	}
+
+	@Override
+	public boolean canBuild(Name<?> name) {
+		return name.getClazz() == String.class && keys.contains(name.getName());
+	}
+
+	@Override
+	public <T> MachineEngine<T> getEngine(Name<T> name) {
+		return new NoDepsMachineEngine<T>(name, priority(), BoundlessComponentBox.FACTORY) {
+			@Override
+			protected T doNewComponent(SatisfiedBOM satisfiedBOM) {
+				return (T) "false";
+			}
+		};
+	}
+
+	@Override
+	public <T> Set<Name<T>> nameBuildableComponents(Class<T> componentClass) {
+		if (componentClass != String.class) {
+			return ImmutableSet.of();
+		}
+		return Sets.newLinkedHashSet(Iterables.transform(keys, new Function<String, Name<T>>() {
+			@Override
+			public Name<T> apply(String input) {
+				return (Name<T>) Name.of(String.class, input);
+			}
+		}));
+	}
+
+	@Override
+	public int priority() {
+		return -10000;
+	}
+}

restx-factory/src/test/java/restx/factory/DeactivationFactoryMachineTest.java

@@ -0,0 +1,20 @@
+package restx.factory;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class DeactivationFactoryMachineTest {
+    @Test
+    public void should_deactivate_components() throws Exception {
+        Name<Integer> one = Name.of(Integer.class, "one");
+        Name<Integer> two = Name.of(Integer.class, "two");
+        Factory factory = Factory.builder()
+                .addMachine(new SingletonFactoryMachine<>(0, new NamedComponent(one, 1)))
+                .addMachine(new SingletonFactoryMachine<>(0, new NamedComponent(two, 2)))
+                .addMachine(DeactivationFactoryMachine.forNames(one))
+                .build();
+
+        assertThat(factory.getComponents(Integer.class)).containsExactly(2);
+    }
+}