/*
* Copyright 2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.gradle.api.internal;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.gradle.api.GradleException;
import org.gradle.api.InvalidUserDataException;
import org.gradle.api.NamedDomainObjectFactory;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static org.gradle.internal.Cast.uncheckedCast;
public class DefaultPolymorphicNamedEntityInstantiator<T> implements PolymorphicNamedEntityInstantiator<T> {
private final Map<Class<? extends T>, NamedDomainObjectFactory<? extends T>> factories = Maps.newHashMap();
private final Class<? extends T> baseType;
private final String displayName;
public DefaultPolymorphicNamedEntityInstantiator(Class<? extends T> type, String displayName) {
this.displayName = displayName;
this.baseType = type;
}
public <S extends T> S create(String name, Class<S> type) {
@SuppressWarnings("unchecked")
NamedDomainObjectFactory<S> factory = (NamedDomainObjectFactory<S>) factories.get(type);
if (factory == null) {
throw new InvalidUserDataException(
String.format("Cannot create a %s because this type is not known to %s. Known types are: %s", type.getSimpleName(), displayName, getSupportedTypeNames()),
new NoFactoryRegisteredForTypeException());
}
return factory.create(name);
}
public String getSupportedTypeNames() {
List<String> names = Lists.newArrayList();
for (Class<?> clazz : factories.keySet()) {
names.add(clazz.getSimpleName());
}
Collections.sort(names);
return names.isEmpty() ? "(None)" : Joiner.on(", ").join(names);
}
@Override
public <U extends T> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory) {
if (!baseType.isAssignableFrom(type)) {
String message = String.format("Cannot register a factory for type %s because it is not a subtype of container element type %s.", type.getSimpleName(), baseType.getSimpleName());
throw new IllegalArgumentException(message);
}
if(factories.containsKey(type)){
throw new GradleException(String.format("Cannot register a factory for type %s because a factory for this type is already registered.", type.getSimpleName()));
}
factories.put(type, factory);
}
@Override
public Set<? extends Class<? extends T>> getCreatableTypes() {
return ImmutableSet.copyOf(factories.keySet());
}
public void copyFactoriesFrom(DefaultPolymorphicNamedEntityInstantiator<T> source) {
for (Class<? extends T> languageType : source.factories.keySet()) {
copyFactory(source, languageType);
}
}
<U extends T> void copyFactory(DefaultPolymorphicNamedEntityInstantiator<T> source, Class<U> type) {
NamedDomainObjectFactory<U> factory = uncheckedCast(source.factories.get(type));
registerFactory(type, factory);
}
}