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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.apache.drill.common.graph;

import java.util.Collection;
import java.util.List;

import org.apache.drill.common.logical.UnexpectedOperatorType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class Graph, R extends G, T extends G> {

  static final Logger logger = LoggerFactory.getLogger(Graph.class);

  private AdjacencyList adjList;
  private final List roots;
  private final List leaves;

  public Graph(List operators, Class root, Class leaf) {
    adjList = AdjacencyList.newInstance(operators);
    roots = checkOperatorType(adjList.getRootNodes(), root, String.format("Root nodes must be a subclass of %s.", root.getSimpleName()));
    leaves = checkOperatorType(adjList.getLeafNodes(), leaf, String.format("Leaf nodes must be a subclass of %s.", leaf.getSimpleName()));
  }

  @SuppressWarnings("unchecked")
  private  List checkOperatorType(Collection ops, Class classIdentifier, String error){
    for(G o : ops){
      if(!classIdentifier.isAssignableFrom(o.getClass())){
        throw new UnexpectedOperatorType(o, error);
      }
    }
    return (List) ops;
  }

  public AdjacencyList getAdjList() {
    return adjList;
  }

  public Collection getRoots() {
    return roots;
  }

  public Collection getLeaves() {
    return leaves;
  }

  public static , R extends G, T extends G> Graph newGraph(List operators, Class root, Class leaf){
    return new Graph(operators, root, leaf);
  }

}