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improve the robustness of LadderGenerator hit-1173710215 #1

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improve the robustness of LadderGenerator hit-1173710215 #1

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11 changes: 9 additions & 2 deletions Lab6-1160300314/src/ladder/LadderGenerator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,9 @@ public class LadderGenerator {
/*
Rep invariant:
numberOfLadders is equal to Params.n
numberOfLadders > 0
length is equal to Params.h
length > 0
Abstraction function:
represents a generator can generate ladders with same pedals on them.
Safety from rep exposure:
Expand All @@ -29,11 +31,14 @@ public class LadderGenerator {
/**
* Can generating Params.n ladders in config.
*
* @throws ConfigurationException if config is wrong.
* @throws Exception if config is wrong or length or numberOfLadders <= 0.
*/
public LadderGenerator() throws ConfigurationException {
public LadderGenerator() throws Exception {
this.length = ConfigReader.getConfig(Params.h);
this.numberOfLadders = ConfigReader.getConfig(Params.n);
if (this.length <= 0 || this.numberOfLadders <= 0) {
throw new Exception("length or numberOfLadders <= 0");
}
this.checkRep();
}

Expand All @@ -44,6 +49,8 @@ private void checkRep() {

assert length == numberOfPedals;
assert numberOfLadders == number;
assert number > 0;
assert numberOfPedals > 0;
} catch (ConfigurationException e) {
throw new RuntimeException(e);
}
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