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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.eclipse.aether.util.graph.selector;
import org.eclipse.aether.collection.DependencyCollectionContext;
import org.eclipse.aether.collection.DependencySelector;
import org.eclipse.aether.graph.Dependency;
import static java.util.Objects.requireNonNull;
/**
* A dependency selector that excludes optional dependencies which occur beyond level one of the dependency graph.
*
* @see Dependency#isOptional()
*/
public final class OptionalDependencySelector implements DependencySelector {
private final int depth;
/**
* Creates a new selector to exclude optional transitive dependencies.
*/
public OptionalDependencySelector() {
depth = 0;
}
private OptionalDependencySelector(int depth) {
this.depth = depth;
}
public boolean selectDependency(Dependency dependency) {
requireNonNull(dependency, "dependency cannot be null");
return depth < 2 || !dependency.isOptional();
}
public DependencySelector deriveChildSelector(DependencyCollectionContext context) {
requireNonNull(context, "context cannot be null");
if (depth >= 2) {
return this;
}
return new OptionalDependencySelector(depth + 1);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (null == obj || !getClass().equals(obj.getClass())) {
return false;
}
OptionalDependencySelector that = (OptionalDependencySelector) obj;
return depth == that.depth;
}
@Override
public int hashCode() {
int hash = getClass().hashCode();
hash = hash * 31 + depth;
return hash;
}
@Override
public String toString() {
return String.format("%s(depth: %d)", this.getClass().getSimpleName(), this.depth);
}
}