content: /**
   * 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.bigtop.datagenerators.samplers.pdfs;
  
  import java.util.Map;
  import java.util.Set;
  
  import com.google.common.collect.ImmutableMap;
  
  public class MultinomialPDF<T> implements ProbabilityDensityFunction<T>
  {
  	private final ImmutableMap<T, Double> probabilities;
  
  	public MultinomialPDF(Map<T, Double> probabilities)
  	{
  		this.probabilities = ImmutableMap.copyOf(probabilities);
  	}
  
  	public Set<T> getData()
  	{
  		return probabilities.keySet();
  	}
  
  	public double probability(T value)
  	{
  		if(probabilities.containsKey(value))
  		{
  			return probabilities.get(value);
  		}
  
  		return 0.0;
  	}
  
  	@Override
  	public String toString()
  	{
  		String str = "";
  		for(Map.Entry<T, Double> entry: probabilities.entrySet())
  		{
  			str += entry.getValue() + "," + entry.getKey() + "\n";
  		}
  		return str;
  	}
  }
  