Tuple.java
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package com.jflyfox.util.tuple;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* 元祖工厂类，用于创建二元组、三元组、四元组、五元组
*
*/
public class Tuple {
/**
* 返回二元组
*
* @param a
* @param b
* @return
*/
public static <A, B> TwoTuple<A, B> tuple(A a, B b) {
return new TwoTuple<A, B>(a, b);
}
/**
* 返回二元组列表,A为Tuple.first,B为Tuple.second
*
* @param a
* Tuple.first
* @param bList
* 列表中元素为Tuple.second
* @return
*/
public static <A, B> List<TwoTuple<A, B>> tupleList(A a, Collection<B> bList) {
List<TwoTuple<A, B>> tupleList = new ArrayList<TwoTuple<A, B>>(bList.size());
for (B b : bList) {
tupleList.add(tuple(a, b));
}
return tupleList;
}
/**
* 返回三元组
*
* @param a
* @param b
* @param c
* @return
*/
public static <A, B, C> ThreeTuple<A, B, C> tuple(A a, B b, C c) {
return new ThreeTuple<A, B, C>(a, b, c);
}
/**
* 返回四元组
*
* @param a
* @param b
* @param c
* @param d
* @return
*/
public static <A, B, C, D> FourTuple<A, B, C, D> tuple(A a, B b, C c, D d) {
return new FourTuple<A, B, C, D>(a, b, c, d);
}
/**
* 返回五元组
*
* @param a
* @param b
* @param c
* @param d
* @param e
* @return
*/
public static <A, B, C, D, E> FiveTuple<A, B, C, D, E> tuple(A a, B b, C c, D d, E e) {
return new FiveTuple<A, B, C, D, E>(a, b, c, d, e);
}
/**
* 根据参数长度的不同，返回2~5元组
*
* @return
*/
public static ITuple tuple(Object[] args) {
if (args.length == 2) {
return tuple(args[0], args[1]);
} else if (args.length == 3) {
return tuple(args[0], args[1], args[2]);
} else if (args.length == 4) {
return tuple(args[0], args[1], args[2], args[3]);
} else if (args.length == 5) {
return tuple(args[0], args[1], args[2], args[3], args[4]);
} else {
throw new IllegalArgumentException("error args length " + args.length + " for create tuple");
}
}
}