package com.wdxxl.guava.model.range;
import java.util.Set;
import com.google.common.collect.ContiguousSet;
import com.google.common.collect.DiscreteDomain;
import com.google.common.collect.Range;
/**
* http://docs.guava-libraries.googlecode.com/git-history/v12.0/javadoc/com/google/common/collect/Range.html
*
* Notation Definition Factory method
* (a..b) {x | a < x < b} open
* [a..b] {x | a <= x <= b} closed
* (a..b] {x | a < x <= b} openClosed
* [a..b) {x | a <= x < b} closedOpen
* (a..+∞) {x | x > a} greaterThan
* [a..+∞) {x | x >= a} atLeast
* (-∞..b) {x | x < b} lessThan
* (-∞..b] {x | x <= b} atMost
* (-∞..+∞) {x} all
*/
public class RangeTest {
public static void main(String[] args) {
Range<Integer> range = Range.closed(20, 30);
print("closed", ContiguousSet.create(range, DiscreteDomain.integers()));
range = Range.open(20, 30);
print("open", ContiguousSet.create(range, DiscreteDomain.integers()));
range = Range.openClosed(20, 30);
print("openClosed", ContiguousSet.create(range, DiscreteDomain.integers()));
range = Range.closedOpen(20, 30);
print("closedOpen", ContiguousSet.create(range, DiscreteDomain.integers()));
range = Range.greaterThan(20);
System.out.println("greaterThan: "
+ ContiguousSet.create(range, DiscreteDomain.integers()).toString());
range = Range.atLeast(20);
System.out.println(
"atLeast: " + ContiguousSet.create(range, DiscreteDomain.integers()).toString());
range = Range.lessThan(30);
System.out.println(
"lessThan: " + ContiguousSet.create(range, DiscreteDomain.integers()).toString());
range = Range.atMost(30);
System.out.println(
"atMost: " + ContiguousSet.create(range, DiscreteDomain.integers()).toString());
range = Range.all();
System.out.println(
"all: " + ContiguousSet.create(range, DiscreteDomain.integers()).toString());
}
public static void print(String type, Set<Integer> ranges) {
boolean isFirst = true;
System.out.print(type + ": ");
for (Integer i : ranges) {
System.out.print(isFirst ? i : "," + i);
isFirst = false;
}
System.out.println();
}
/**
* closed: 20,21,22,23,24,25,26,27,28,29,30
* open: 21,22,23,24,25,26,27,28,29
* openClosed: 21,22,23,24,25,26,27,28,29,30
* closedOpen: 20,21,22,23,24,25,26,27,28,29
* greaterThan: [21‥2147483647]
* atLeast: [20‥2147483647]
* lessThan: [-2147483648‥29]
* atMost: [-2147483648‥30]
* all: [-2147483648‥2147483647]
*/
}
Guava: Range 开闭区间
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