/*
* 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.rules;
import com.google.common.base.Optional;
import com.google.common.collect.Maps;
import org.gradle.api.GradleException;
import org.gradle.api.NamedDomainObjectFactory;
import org.gradle.model.internal.core.rule.describe.ModelRuleDescriptor;
import java.util.Map;
public class DefaultRuleAwareNamedDomainObjectFactoryRegistry<T> implements RuleAwareNamedDomainObjectFactoryRegistry<T> {
private final Map<Class<? extends T>, Optional<ModelRuleDescriptor>> creators = Maps.newHashMap();
private final NamedDomainObjectFactoryRegistry<T> delegate;
public DefaultRuleAwareNamedDomainObjectFactoryRegistry(NamedDomainObjectFactoryRegistry<T> delegate) {
this.delegate = delegate;
}
@Override
public <U extends T> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory) {
registerFactory(type, factory, null);
}
@Override
public <U extends T> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory, ModelRuleDescriptor descriptor) {
checkCanRegister(type, descriptor);
delegate.registerFactory(type, factory);
}
private void checkCanRegister(Class<? extends T> type, ModelRuleDescriptor descriptor) {
Optional<ModelRuleDescriptor> creator = creators.get(type);
if (creator != null) {
StringBuilder builder = new StringBuilder("Cannot register a factory for type ")
.append(type.getSimpleName())
.append(" because a factory for this type was already registered");
if (creator.isPresent()) {
builder.append(" by ");
creator.get().describeTo(builder);
}
builder.append(".");
throw new GradleException(builder.toString());
}
creators.put(type, Optional.fromNullable(descriptor));
}
}