package com.happyelements.athene.game.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Collection;

import com.google.common.collect.Lists;

/**

* Math工具类

*

* @version 1.0

* @since 1.0

*/

public class MathUtil {

/**

* @see MathUtil#min(Collection)

* @param ts

* @return

*/

public static > T min(T... ts) {

return min(Lists.newArrayList(ts));

}

/**

* 取最小值

* @param values

* @throws NullPointerException if (values == null || values.contain(null))

* @return

*/

public static > T min(Collection values) {

checkNotNull(values);

T min = null;

for (T t : values) {

checkNotNull(t);

if (min == null) {

min = t;

} else {

min = min.compareTo(t) < 0 ? min : t;

}

}

return min;

}

/**

* @see MathUtil#max(Collection)

* @param ts

* @return

*/

public static > T max(T... ts) {

return max(Lists.newArrayList(ts));

}

/**

* 取最大值

* @param values

* @throws NullPointerException if (values == null || values.contain(null))

* @return

*/

public static > T max(Collection values) {

checkNotNull(values);

T max = null;

for (T t : values) {

checkNotNull(t);

if (max == null) {

max = t;

} else {

max = max.compareTo(t) > 0 ? max : t;

}

}

return max;

}

/**

* 求和

* @param values

* @throws NullPointerException if (values == null || values.contain(null))

* @return

*/

public static Integer sum(Collection values) {

checkNotNull(values);

int sum = 0;

for (Integer integer : values) {

checkNotNull(integer);

sum += integer;

}

return sum;

}

/**

* @see MathUtil#sum(Collection)

* @param ts

* @return

*/

public static Integer sum(Integer... ts) {

return sum(Lists.newArrayList(ts));

}

}