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Condition: remove unnecessare object instantiation

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Only one each, true and false, Condition object needed.
This commit is contained in:
Paul Campbell 2017-04-21 14:38:12 +01:00
parent 870c3c2b00
commit 14c494ffdd
1 changed files with 21 additions and 4 deletions
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25
src/main/java/net/kemitix/conditional/Condition.java
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@ -21,6 +21,9 @@
package net.kemitix.conditional;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
/**
* If-then-else in a functional-style.
*
@ -37,9 +40,9 @@ public interface Condition {
*/
static Condition where(final boolean clause) {
if (clause) {
return new TrueCondition();
return TrueCondition.getInstance();
}
return new FalseCondition();
return FalseCondition.getInstance();
}
/**
@ -123,14 +126,21 @@ public interface Condition {
/**
* A {@code Condition} that has evaluated to {@code true}.
*/
@NoArgsConstructor(access = AccessLevel.PRIVATE)
class TrueCondition implements Condition {
private static final Condition INSTANCE = new TrueCondition();
private static Condition getInstance() {
return INSTANCE;
}
@Override
public Condition and(final boolean clause) {
if (clause) {
return this;
}
return new FalseCondition();
return FalseCondition.getInstance();
}
@Override
@ -153,8 +163,15 @@ public interface Condition {
/**
* A {@code Condition} that has evaluated to {@code false}.
*/
@NoArgsConstructor(access = AccessLevel.PRIVATE)
class FalseCondition implements Condition {
private static final Condition INSTANCE = new FalseCondition();
private static Condition getInstance() {
return INSTANCE;
}
@Override
public Condition and(final boolean clause) {
return this;
@ -163,7 +180,7 @@ public interface Condition {
@Override
public Condition or(final boolean secondClause) {
if (secondClause) {
return new TrueCondition();
return TrueCondition.getInstance();
}
return this;
}