/*
* 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.registry;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import org.gradle.api.Nullable;
import org.gradle.internal.Cast;
import org.gradle.model.RuleSource;
import org.gradle.model.internal.core.*;
import org.gradle.model.internal.core.rule.describe.ModelRuleDescriptor;
import org.gradle.model.internal.type.ModelType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.Set;
/**
* A model node that is a reference to some other node.
*/
public class ModelReferenceNode extends ModelNodeInternal {
private static final Logger LOGGER = LoggerFactory.getLogger(ModelReferenceNode.class);
private final MutableModelNode parent;
private ModelNodeInternal target;
public ModelReferenceNode(ModelRegistryInternal modelRegistry, ModelRegistration registration, MutableModelNode parent) {
super(modelRegistry, registration);
this.parent = parent;
}
@Override
public void setTarget(ModelNode target) {
// Once the node has been discovered, changing the target is not allowed, as it changes the promise of the node as well
if (getState() != State.Registered) {
throw new IllegalStateException(String.format("Cannot set target for model element '%s' as this element is not mutable.", getPath()));
}
if (LOGGER.isDebugEnabled()) {
String targetPath = target == null ? null : "'" + target.getPath() + "'";
LOGGER.debug("Project {} - Setting the target of model element '{}' to point at {}.",
modelRegistry.getProjectPath(), getPath(), targetPath);
}
this.target = (ModelNodeInternal) target;
}
public ModelNodeInternal getTarget() {
return target;
}
@Override
public Optional<String> getValueDescription() {
if (target == null) {
return Optional.of("null");
} else {
return Optional.of("reference to element '" + target.getPath() + "'");
}
}
@Override
public boolean canBeViewedAs(ModelType<?> type) {
return target == null ? super.canBeViewedAs(type) : target.canBeViewedAs(type);
}
@Override
public <T> ModelView<? extends T> asMutable(final ModelType<T> type, ModelRuleDescriptor ruleDescriptor) {
if (target == null) {
return InstanceModelView.of(getPath(), type, null);
} else {
return new ModelViewWrapper<T>(getPath(), target.asMutable(type, ruleDescriptor));
}
}
@Override
public <T> ModelView<? extends T> asImmutable(ModelType<T> type, @Nullable ModelRuleDescriptor ruleDescriptor) {
if (target == null) {
return InstanceModelView.of(getPath(), type, null);
} else {
return new ModelViewWrapper<T>(getPath(), target.asImmutable(type, ruleDescriptor));
}
}
@Override
public ModelPromise getPromise() {
return target == null ? super.getPromise() : target.getPromise();
}
@Override
public ModelAdapter getAdapter() {
return target == null ? super.getAdapter() : target.getAdapter();
}
@Override
public void addLink(ModelRegistration registration) {
throw new UnsupportedOperationException();
}
@Override
public <T> void addReference(String name, ModelType<T> type, ModelNode target, ModelRuleDescriptor ruleDescriptor) {
throw new UnsupportedOperationException();
}
@Override
public void removeLink(String name) {
throw new UnsupportedOperationException();
}
@Override
public void applyToLink(ModelActionRole type, ModelAction action) {
throw new UnsupportedOperationException();
}
@Override
public void applyTo(NodePredicate predicate, ModelActionRole role, ModelAction action) {
throw new UnsupportedOperationException();
}
@Override
public void applyTo(NodePredicate predicate, Class<? extends RuleSource> rules) {
throw new UnsupportedOperationException();
}
@Override
public int getLinkCount(Predicate<? super MutableModelNode> predicate) {
return target == null ? 0 : target.getLinkCount(predicate);
}
@Override
public Set<String> getLinkNames(Predicate<? super MutableModelNode> predicate) {
return target == null ? Collections.<String>emptySet() : target.getLinkNames(predicate);
}
@Override
public Set<String> getLinkNames() {
return target == null ? Collections.<String>emptySet() : target.getLinkNames();
}
@Nullable
@Override
public ModelNodeInternal getLink(String name) {
return target == null ? null : target.getLink(name);
}
@Override
public Iterable<? extends ModelNodeInternal> getLinks() {
return target == null ? Collections.<ModelNodeInternal>emptyList() : target.getLinks();
}
@Override
public Iterable<? extends MutableModelNode> getLinks(Predicate<? super MutableModelNode> predicate) {
return target == null ? Collections.<MutableModelNode>emptyList() : target.getLinks(predicate);
}
@Override
public int getLinkCount() {
return target == null ? 0 : target.getLinkCount();
}
@Override
public boolean hasLink(String name, Predicate<? super MutableModelNode> predicate) {
return target != null && target.hasLink(name, predicate);
}
@Override
public boolean hasLink(String name) {
return target != null && target.hasLink(name);
}
@Override
public <T> T getPrivateData(ModelType<T> type) {
throw new UnsupportedOperationException();
}
@Override
public <T> void setPrivateData(Class<? super T> type, T object) {
throw new UnsupportedOperationException();
}
@Override
public <T> void setPrivateData(ModelType<? super T> type, T object) {
throw new UnsupportedOperationException();
}
@Override
public Object getPrivateData() {
throw new UnsupportedOperationException();
}
@Override
public <T> T getPrivateData(Class<T> type) {
throw new UnsupportedOperationException();
}
@Override
public void ensureUsable() {
if (target != null) {
target.ensureUsable();
}
}
@Override
public void ensureAtLeast(State state) {
if (target != null) {
target.ensureAtLeast(state);
}
}
@Override
public MutableModelNode getParent() {
return parent;
}
private static class ModelViewWrapper<T> implements ModelView<T> {
private final ModelView<? extends T> view;
private final ModelPath path;
public ModelViewWrapper(ModelPath path, ModelView<? extends T> view) {
this.path = path;
this.view = view;
}
@Override
public ModelPath getPath() {
return path;
}
@Override
public ModelType<T> getType() {
return Cast.uncheckedCast(view.getType());
}
@Override
public T getInstance() {
return view.getInstance();
}
@Override
public void close() {
view.close();
}
}
}