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#136 added Expression.as for general aliasing

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This commit is contained in:
Timo Westkämper 2012-05-08 23:04:52 +03:00
parent 1a5e002e9e
commit d4aa7bf337
2 changed files with 23 additions and 1 deletions
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17
querydsl-core/src/main/java/com/mysema/query/support/Expressions.java
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@ -18,6 +18,7 @@ import javax.annotation.Nullable;
import com.mysema.query.QueryMetadata;
import com.mysema.query.types.ConstantImpl;
import com.mysema.query.types.Expression;
import com.mysema.query.types.NullExpression;
import com.mysema.query.types.Operator;
import com.mysema.query.types.Ops;
import com.mysema.query.types.Path;
@ -61,10 +62,24 @@ import com.mysema.query.types.template.StringTemplate;
*
*/
public final class Expressions {
@SuppressWarnings({ "unchecked", "rawtypes" })
public static <D> SimpleExpression<D> as(D source, Path<D> alias) {
if (source == null) {
return as((Expression)NullExpression.DEFAULT, alias);
} else {
return as(new ConstantImpl<D>(source), alias);
}
}
@SuppressWarnings("unchecked")
public static <D> SimpleExpression<D> as(Expression<D> source, Path<D> alias) {
return SimpleOperation.create((Class<D>)alias.getType(), Ops.ALIAS, source, alias);
if (source == null) {
return as((Expression)NullExpression.DEFAULT, alias);
} else {
return SimpleOperation.create((Class<D>)alias.getType(), Ops.ALIAS, source, alias);
}
}
@Nullable

7
querydsl-core/src/test/java/com/mysema/query/support/ExpressionsTest.java
View File

@ -32,6 +32,13 @@ public class ExpressionsTest {
private static final BooleanExpression a = new BooleanPath("a"), b = new BooleanPath("b");
@Test
public void As() {
assertEquals("null as str", Expressions.as(null, str).toString());
assertEquals("str as str", Expressions.as("str", str).toString());
assertEquals("s as str", Expressions.as(new StringPath("s"), str).toString());
}
@Test
public void AllOf() {
assertEquals("a && b", Expressions.allOf(a, b).toString());