/*
* 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.model.internal.core;
import com.google.common.base.Optional;
import org.gradle.api.Nullable;
import org.gradle.internal.Cast;
import org.gradle.internal.reflect.DirectInstantiator;
import org.gradle.model.internal.core.rule.describe.ModelRuleDescriptor;
import org.gradle.model.internal.type.ModelType;
import java.util.Collections;
/**
* Should be used along with {@code PolymorphicModelMapProjection}.
*/
public class SpecializedModelMapProjection<P, E> implements ModelProjection {
private final ModelType<P> publicType;
private final ModelType<E> elementType;
private final Class<? extends P> viewImpl;
private final ChildNodeInitializerStrategyAccessor<? super E> creatorStrategyAccessor;
public SpecializedModelMapProjection(ModelType<P> publicType, ModelType<E> elementType, Class<? extends P> viewImpl, ChildNodeInitializerStrategyAccessor<? super E> creatorStrategyAccessor) {
this.publicType = publicType;
this.elementType = elementType;
this.viewImpl = viewImpl;
this.creatorStrategyAccessor = creatorStrategyAccessor;
}
@Override
public Iterable<String> getTypeDescriptions(MutableModelNode node) {
return Collections.singleton(publicType.toString());
}
@Nullable
@Override
public <T> ModelView<? extends T> asImmutable(ModelType<T> type, MutableModelNode node, @Nullable ModelRuleDescriptor ruleDescriptor) {
if (canBeViewedAs(type)) {
return Cast.uncheckedCast(toView(node, ruleDescriptor, false));
} else {
return null;
}
}
@Nullable
@Override
public <T> ModelView<? extends T> asMutable(ModelType<T> type, MutableModelNode node, ModelRuleDescriptor ruleDescriptor) {
if (canBeViewedAs(type)) {
return Cast.uncheckedCast(toView(node, ruleDescriptor, true));
} else {
return null;
}
}
private ModelView<P> toView(MutableModelNode modelNode, ModelRuleDescriptor ruleDescriptor, boolean mutable) {
ChildNodeInitializerStrategy<? super E> creatorStrategy = creatorStrategyAccessor.getStrategy(modelNode);
DefaultModelViewState state = new DefaultModelViewState(modelNode.getPath(), publicType, ruleDescriptor, mutable, !mutable);
P instance = DirectInstantiator.instantiate(viewImpl, publicType, elementType, ruleDescriptor, modelNode, state, creatorStrategy);
return InstanceModelView.of(modelNode.getPath(), publicType, instance, state.closer());
}
@Override
public <T> boolean canBeViewedAs(ModelType<T> targetType) {
return targetType.isAssignableFrom(publicType);
}
@Override
public Optional<String> getValueDescription(MutableModelNode modelNodeInternal) {
return Optional.absent();
}
}