/*
 * 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.sysds.runtime.lineage;

import java.util.BitSet;

public class LineagePath {
	protected BitSet _lastBranch = null;
	protected int _branchCounter = 0;
	
	
	public void initLastBranch() {
		_lastBranch = new BitSet();
		_branchCounter = 0;
	}
	
	public void removeLastBranch() {
		_lastBranch = null;
		_branchCounter = 0;
	}
	
	public void clearLastBranch() {
		if (_lastBranch != null)
			_lastBranch.clear();
		_branchCounter = 0;
	}
	
	public void setBranchPredicateValue(boolean value) {
		if (_lastBranch != null) {
			_lastBranch.set(_branchCounter++, value);
		}
	}
	
	public Long getLastBranch() {
		if (_lastBranch != null)
			if (_lastBranch.toLongArray().length > 1)
				throw new RuntimeException("Length of _lastBranch.toLongArray() exceeds 1!");
			else
				return _lastBranch.toLongArray().length == 1 ? _lastBranch.toLongArray()[0] : 0L;
		return 0L;
	}
}