/*
* 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.Predicate;
import com.google.common.base.Predicates;
import org.gradle.api.Nullable;
import org.gradle.model.internal.type.ModelType;
/**
* Criteria for selecting the descendants of a particular node.
*/
public abstract class NodePredicate {
private final Predicate<? super MutableModelNode> matcher;
private NodePredicate(Predicate<? super MutableModelNode> matcher) {
this.matcher = matcher;
}
public ModelSpec scope(ModelPath scope) {
return scope(scope, matcher);
}
protected abstract ModelSpec scope(ModelPath scope, Predicate<? super MutableModelNode> matcher);
public static NodePredicate allLinks() {
return allLinks(Predicates.<MutableModelNode>alwaysTrue());
}
public static NodePredicate allLinks(Predicate<? super MutableModelNode> predicate) {
return new NodePredicate(predicate) {
@Override
protected ModelSpec scope(ModelPath scope, Predicate<? super MutableModelNode> matcher) {
return new BasicPredicate(null, scope, null, matcher);
}
};
}
public static NodePredicate allDescendants() {
return allDescendants(Predicates.<MutableModelNode>alwaysTrue());
}
public static NodePredicate allDescendants(Predicate<? super MutableModelNode> predicate) {
return new NodePredicate(predicate) {
@Override
protected ModelSpec scope(ModelPath scope, Predicate<? super MutableModelNode> matcher) {
return new BasicPredicate(null, null, scope, matcher);
}
};
}
public NodePredicate withType(Class<?> type) {
return withType(ModelType.of(type));
}
public NodePredicate withType(ModelType<?> type) {
final Predicate<MutableModelNode> matcher = ModelNodes.withType(type, this.matcher);
final NodePredicate parent = this;
return new NodePredicate(matcher) {
@Override
protected ModelSpec scope(ModelPath scope, Predicate<? super MutableModelNode> matcher) {
return parent.scope(scope, matcher);
}
};
}
private static class BasicPredicate extends ModelSpec {
private final ModelPath path;
private final ModelPath parent;
private final ModelPath ancestor;
private final Predicate<? super MutableModelNode> matcher;
public BasicPredicate(ModelPath path, ModelPath parent, ModelPath ancestor, Predicate<? super MutableModelNode> matcher) {
this.path = path;
this.parent = parent;
this.ancestor = ancestor;
this.matcher = matcher;
}
@Nullable
@Override
public ModelPath getPath() {
return path;
}
@Nullable
@Override
public ModelPath getParent() {
return parent;
}
@Nullable
@Override
public ModelPath getAncestor() {
return ancestor;
}
@Override
public boolean matches(MutableModelNode node) {
return matcher.apply(node);
}
}
}