/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed 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 com.ibm.bi.dml.runtime.functionobjects;

import java.io.IOException;

import com.ibm.bi.dml.runtime.DMLRuntimeException;
import com.ibm.bi.dml.runtime.util.MapReduceTool;


public class RemoveFile extends FileFunction 
{
		
	private static RemoveFile singleObj = null;

	private RemoveFile() {
		// nothing to do here
	}
	
	public static RemoveFile getRemoveFileFnObject() {
		if ( singleObj == null )
			singleObj = new RemoveFile();
		return singleObj;
	}
	
	public Object clone() throws CloneNotSupportedException {
		// cloning is not supported for singleton classes
		throw new CloneNotSupportedException();
	}

	@Override
	public String execute (String fname) throws DMLRuntimeException {
		try {
			MapReduceTool.deleteFileIfExistOnHDFS(fname);
		} catch (IOException e) {
			throw new DMLRuntimeException(e);
		}
		return null;
	}

}