/*
 * 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.sysml.hops.globalopt.gdfgraph;

import java.util.ArrayList;

import org.apache.sysml.hops.Hop;
import org.apache.sysml.runtime.controlprogram.ProgramBlock;

/**
 * Crossblock operators represent 
 * 
 */
public class GDFCrossBlockNode extends GDFNode
{
	
	
	public enum CrossBlockNodeType {
		PLAIN,
		MERGE,
	}
	
	private CrossBlockNodeType _cbtype = null;
	private String _name = null;
	
	/**
	 * Constructor PLAIN crossblocknode
	 * 
	 * @param hop high-level operator
	 * @param pb program block
	 * @param input GDF node
	 * @param name the name
	 */
	public GDFCrossBlockNode( Hop hop, ProgramBlock pb, GDFNode input, String name )
	{
		super(hop, pb, null);
		_type = NodeType.CROSS_BLOCK_NODE;
		_inputs = new ArrayList<GDFNode>();
		_inputs.add( input );
		
		_cbtype = CrossBlockNodeType.PLAIN;
		_name = name;
	}
	
	/**
	 * Constructor MERGE crossblocknode
	 * 
	 * @param hop high-level operator
	 * @param pb program block
	 * @param input1 GDF node 1
	 * @param input2 GDF node 2
	 * @param name the name
	 */
	public GDFCrossBlockNode( Hop hop, ProgramBlock pb, GDFNode input1, GDFNode input2, String name )
	{
		super(hop, pb, null);
		_type = NodeType.CROSS_BLOCK_NODE;
		_inputs = new ArrayList<GDFNode>();
		_inputs.add( input1 );
		_inputs.add( input2 );
		
		_cbtype = CrossBlockNodeType.MERGE;
		_name = name;
	}

	public String getName()
	{
		return _name;
	}
	
	@Override
	public String explain(String deps) 
	{
		String ldeps = (deps!=null) ? deps : "";
		
		return "CBNode "+ldeps+" ["+_name+", "+_cbtype.toString().toLowerCase()+"]";
	}
}