/**
* 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.lens.ml.algo.spark;
/**
* Directly return input when it is known to be double.
*/
public class DoubleValueMapper extends FeatureValueMapper {
/*
* (non-Javadoc)
*
* @see org.apache.lens.ml.spark.FeatureValueMapper#call(java.lang.Object)
*/
@Override
public final Double call(Object input) {
if (input instanceof Double || input == null) {
return input == null ? Double.valueOf(0d) : (Double) input;
}
throw new IllegalArgumentException("Invalid input expecting only doubles, but got " + input);
}
}