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Improved implementation of equals() and hashCode() for ATNConfig

This commit is contained in:
sharwell 2012-02-08 18:09:32 -06:00
parent 64210f4b72
commit dcdfac4bcd
1 changed files with 22 additions and 18 deletions
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34
runtime/Java/src/org/antlr/v4/runtime/atn/ATNConfig.java
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@ -117,36 +117,40 @@ public class ATNConfig {
this.lexerActionIndex = c.lexerActionIndex;
}
// public ATNConfig(@NotNull ATNConfig c, @Nullable RuleContext context) {
// this(c, c.state, context);
// }
/** An ATN configuration is equal to another if both have
* the same state, they predict the same alternative, and
* syntactic/semantic contexts are the same.
*/
@Override
public boolean equals(Object o) {
if ( o==null ) return false;
if ( this==o ) return true;
if (!(o instanceof ATNConfig)) {
return false;
}
ATNConfig other = (ATNConfig)o;
return
this.state.stateNumber==other.state.stateNumber &&
this.alt==other.alt &&
(this.context==other.context || (this.context != null && this.context.equals(other.context))) &&
(this.semanticContext==other.semanticContext || (this.semanticContext != null && this.semanticContext.equals(other.semanticContext)));
return this.equals((ATNConfig)o);
}
public boolean equals(ATNConfig other) {
if (this == other) {
return true;
} else if (other == null) {
return false;
}
return this.state.stateNumber==other.state.stateNumber
&& this.alt==other.alt
&& (this.context==other.context || (this.context != null && this.context.equals(other.context)))
&& this.semanticContext.equals(other.semanticContext);
}
@Override
public int hashCode() {
int h = state.stateNumber + alt + (semanticContext!=null ? semanticContext.hashCode() : 0);
if ( context!=null ) h += context.hashCode();
return h;
int hashCode = 7;
hashCode = 5 * hashCode + state.stateNumber;
hashCode = 5 * hashCode + alt;
hashCode = 5 * hashCode + (context != null ? context.hashCode() : 0);
hashCode = 5 * hashCode + semanticContext.hashCode();
return hashCode;
}
@Override