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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 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.mahout.common.parameters;
import  org.apache.hadoop.mapred.JobConf;
A placeholder for some sort of class with more parameters.
public class CompositeParameter<T extends Parameteredextends AbstractParameter<T> {
  public CompositeParameter(Class<T> typeString prefixString name, JobConf jobConf, T defaultValueString description) {
  public void createParameters(String prefix, JobConf jobConf) {
  public Collection<Parameter<?>> getParameters() {
    return get().getParameters();
  public void configure(JobConf jobConf) {
  public void setStringValue(String className) {
    try {
      set((T) Class.forName(className).newInstance());
    } catch (ClassNotFoundException e) {
      throw new IllegalStateException(e);
    } catch (IllegalAccessException e) {
      throw new IllegalStateException(e);
    } catch (InstantiationException e) {
      throw new IllegalStateException(e);
  public String getStringValue() {
    if (get() == null) {
      return null;
    return get().getClass().getName();
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