code: /*
   * #%L
   * Simmetrics Core
   * %%
   * Copyright (C) 2014 - 2016 Simmetrics Authors
   * %%
   * 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.
   * #L%
   */
  
  
  package org.simmetrics.metrics;
  
  import java.util.Set;
  
  import com.google.common.collect.Multiset;
  import com.google.common.collect.Multisets;
  import com.google.common.collect.Sets;
  
  final class Math {
  
  	private Math() {
  		// Utility class
  	}
  	static float max(float a, float b, float c) {
  		return java.lang.Math.max(java.lang.Math.max(a, b), c);
  	}
  
  	static int max(final int a, final int b, final int c) {
  		return java.lang.Math.max(java.lang.Math.max(a, b), c);
  	}
  
  	static float max(float a, float b, float c, float d) {
  		return java.lang.Math.max(
  				java.lang.Math.max(java.lang.Math.max(a, b), c), d);
  	}
  
  
  	static int max(final int a, final int b, final int c, final int d) {
  		return java.lang.Math.max(
  				java.lang.Math.max(java.lang.Math.max(a, b), c), d);
  	}
  
  	static float min(float a, float b, float c) {
  		return java.lang.Math.min(java.lang.Math.min(a, b), c);
  	}
  
  	static int min(final int a, final int b, final int c) {
  		return java.lang.Math.min(java.lang.Math.min(a, b), c);
  	}
  	
  	static float min(final float a, final float b, final float c,
  			final float d) {
  		return java.lang.Math.min(
  				java.lang.Math.min(java.lang.Math.min(a, b), c), d);
  	}
  
  	static int min(final int a, final int b, final int c, final int d) {
  		return java.lang.Math.min(
  				java.lang.Math.min(java.lang.Math.min(a, b), c), d);
  	}
  
  	static <T> Multiset<T> union(Multiset<T> a, Multiset<T> b) {
  		// Lager set first for performance improvement.
  		// See: MathCaliper
  		if (a.size() < b.size()) {
  			return Multisets.union(b, a);
  		}
  
  		return Multisets.union(a, b);
  	}
  
  	static <T> Multiset<T> intersection(Multiset<T> a, Multiset<T> b) {
  		// Smaller set first for performance improvement.
  		// See: MathCaliper
  		if (a.size() < b.size()) {
  			return Multisets.intersection(a, b);
  		}
  
  		return Multisets.intersection(b, a);
  	}
  
  	static <T> Set<T> intersection(Set<T> a, Set<T> b) {
  		// Smaller set first for performance improvement.
  		// See: MathCaliper and note at Sets.intersection
  		if (a.size() < b.size()) {
  			return Sets.intersection(a, b);
  		}
  
  		return Sets.intersection(b, a);
  	}
  }
  