/*
    * 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.apache.maven.internal.impl;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  import org.apache.maven.api.Node;
  import org.apache.maven.api.NodeVisitor;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.DependencyNode;
  
  public abstract class AbstractNode implements Node {
  
      abstract org.eclipse.aether.graph.DependencyNode getDependencyNode();
  
      @Override
      public boolean accept(NodeVisitor visitor) {
          if (visitor.enter(this)) {
              for (Node child : getChildren()) {
                  if (!child.accept(visitor)) {
                      break;
                  }
              }
          }
          return visitor.leave(this);
      }
  
      @Override
      public Node filter(Predicate<Node> filter) {
          List<Node> children =
                  getChildren().stream().filter(filter).map(n -> n.filter(filter)).collect(Collectors.toList());
          return new WrapperNode(this, Collections.unmodifiableList(children));
      }
  
      @Override
      public String asString() {
          StringBuilder sb = new StringBuilder();
  
          DependencyNode node = getDependencyNode();
          Artifact artifact = node.getArtifact();
          sb.append(artifact);
  
          Dependency dependency = node.getDependency();
          if (dependency != null) {
              sb.append(":").append(dependency.getScope());
          }
  
          return sb.toString();
      }
  
      @Override
      public String toString() {
          return getDependencyNode().toString();
      }
  }