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Value: cache True/FalseValueClauses

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Rather than create a new transient object every time when they can be
stateless singletons.
This commit is contained in:
Paul Campbell 2017-04-24 13:35:02 +01:00
parent 07f4af3425
commit 357335779e
1 changed files with 15 additions and 4 deletions
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19
src/main/java/net/kemitix/conditional/Value.java
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@ -23,7 +23,12 @@ package net.kemitix.conditional;
import lombok.RequiredArgsConstructor;
import java.util.AbstractMap.SimpleEntry;
import java.util.Collections;
import java.util.Map;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* A Value from an if-then-else in a functional-style.
@ -32,6 +37,14 @@ import java.util.function.Supplier;
*/
public interface Value {
ValueClause TRUE = new TrueValueClause();
ValueClause FALSE = new FalseValueClause();
Map<Boolean, ValueClause> VALUE_CLAUSES = Collections.unmodifiableMap(
Stream.of(new SimpleEntry<>(true, TRUE), new SimpleEntry<>(false, FALSE))
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
/**
* Create a new {@link ValueClause} for the clause.
*
@ -40,11 +53,9 @@ public interface Value {
*
* @return a true or false value clause
*/
@SuppressWarnings("unchecked")
static <T> ValueClause<T> where(final boolean clause) {
if (clause) {
return new TrueValueClause<>();
}
return new FalseValueClause<>();
return (ValueClause<T>) VALUE_CLAUSES.get(clause);
}
/**