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Use singleton

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This commit is contained in:
Timo Westkämper 2015-02-02 18:38:59 +02:00
parent 1227c60d66
commit 232b8b8d37
3 changed files with 6 additions and 32 deletions
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9
querydsl-core/src/main/java/com/querydsl/core/support/Expressions.java
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@ -637,8 +637,9 @@ public final class Expressions {
*
* @return
*/
public static NullExpression<Object> nullExpression() {
return NullExpression.DEFAULT;
@SuppressWarnings("unchecked")//does not produce non-null instances of T
public static <T> NullExpression<T> nullExpression() {
return (NullExpression<T>) NullExpression.DEFAULT;
}
/**
@ -649,7 +650,7 @@ public final class Expressions {
* @return
*/
public static <T> NullExpression<T> nullExpression(Class<T> type) {
return new NullExpression<T>(type);
return nullExpression();
}
/**
@ -660,7 +661,7 @@ public final class Expressions {
* @return
*/
public static <T> NullExpression<T> nullExpression(Path<T> path) {
return new NullExpression<T>(path.getType());
return nullExpression();
}
private Expressions() {}

2
querydsl-core/src/main/java/com/querydsl/core/types/NullExpression.java
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@ -33,7 +33,7 @@ public class NullExpression<T> extends TemplateExpressionImpl<T> {
*/
public static final NullExpression<Object> DEFAULT = new NullExpression<Object>(Object.class);
public NullExpression(Class<? extends T> type) {
private NullExpression(Class<? extends T> type) {
super(type, NULL_TEMPLATE, Collections.<Expression<?>>emptyList());
}

27
querydsl-core/src/test/java/com/querydsl/core/types/NullExpressionTest.java
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@ -1,27 +0,0 @@
/*
* Copyright 2011, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.querydsl.core.types;
import static org.junit.Assert.*;
import org.junit.Test;
public class NullExpressionTest {
@Test
public void test() {
assertNotNull(new NullExpression<Object>(Object.class));
}
}