@Test
public void PathClassOfTPathOfQString() {
assertEquals(
"variable.property",
Expressions.path(String.class, Expressions.path(Object.class, "variable"), "property")
.toString());
}
@Test
public void roundtrip() throws Exception {
Path<?> path = ExpressionUtils.path(Object.class, "entity");
SimplePath<?> path2 = Expressions.path(Object.class, "entity");
assertEquals(path, serialize(path));
assertEquals(path2, serialize(path2));
assertEquals(path2.isNull(), serialize(path2.isNull()));
assertEquals(path.hashCode(), serialize(path).hashCode());
assertEquals(path2.hashCode(), serialize(path2).hashCode());
assertEquals(path2.isNull().hashCode(), serialize(path2.isNull()).hashCode());
}
@Test
public void expressions() throws Exception {
Map<Class<?>, Object> args = Maps.newHashMap();
args.put(Object.class, "obj");
args.put(BeanPath.class, new EntityPathBase<Object>(Object.class, "obj"));
args.put(Class.class, Integer.class);
args.put(Class[].class, new Class<?>[] {Object.class, Object.class});
args.put(java.util.Date.class, new java.util.Date(0));
args.put(java.sql.Date.class, new java.sql.Date(0));
args.put(java.sql.Time.class, new java.sql.Time(0));
args.put(java.sql.Timestamp.class, new java.sql.Timestamp(0));
args.put(Expression.class, Expressions.enumPath(Gender.class, "e"));
args.put(
Expression[].class,
new Expression<?>[] {Expressions.enumPath(Gender.class, "e"), Expressions.stringPath("s")});
args.put(FactoryExpression.class, Projections.tuple(Expressions.stringPath("str")));
args.put(GroupExpression.class, GroupBy.avg(Expressions.numberPath(Integer.class, "num")));
args.put(Number.class, 1);
args.put(Operator.class, Ops.AND);
args.put(Path.class, Expressions.stringPath("str"));
args.put(PathBuilderValidator.class, PathBuilderValidator.DEFAULT);
args.put(PathMetadata.class, PathMetadataFactory.forVariable("obj"));
args.put(PathInits.class, PathInits.DEFAULT);
args.put(Predicate.class, Expressions.path(Object.class, "obj").isNull());
args.put(QueryMetadata.class, new DefaultQueryMetadata());
args.put(String.class, "obj");
Reflections reflections = new Reflections();
Set<Class<? extends Expression>> types = reflections.getSubTypesOf(Expression.class);
for (Class<?> type : types) {
if (!type.isInterface()
&& !type.isMemberClass()
&& !Modifier.isAbstract(type.getModifiers())) {
for (Constructor<?> c : type.getConstructors()) {
Object[] parameters = new Object[c.getParameterTypes().length];
for (int i = 0; i < c.getParameterTypes().length; i++) {
parameters[i] =
Objects.requireNonNull(
args.get(c.getParameterTypes()[i]), c.getParameterTypes()[i].getName());
}
c.setAccessible(true);
Object o = c.newInstance(parameters);
assertEquals(o, Serialization.serialize(o));
}
}
}
}
@Test
public void PathClassOfTString() {
assertEquals("variable", Expressions.path(String.class, "variable").toString());
}
@Test
public void BooleanPathPathOfQString() {
assertEquals(
"variable.property",
Expressions.booleanPath(Expressions.path(Object.class, "variable"), "property").toString());
}
/**
* {@code Alias} provides alias factory methods
*
* <p>Example:
*
* <pre>{@code
* Employee e = alias(Employee.class, "e");
* for (String name : query.from($(e),employees)
* .where($(e.getDepartment().getId()).eq(1001))
* .list($(e.getName()))) {
* System.out.println(name);
* }
* }</pre>
*
* <p>using the following static imports
*
* <pre>{@code
* import static com.mysema.query.alias.Alias.$;
* import static com.mysema.query.alias.Alias.alias;
* }</pre>
*
* @author tiwe
*/
@SuppressWarnings("PMD")
public final class Alias {
private static final AliasFactory aliasFactory =
new AliasFactory(new DefaultPathFactory(), new DefaultTypeSystem());
private static final SimplePath<Object> it = Expressions.path(Object.class, "it");
// exclude $-methods from Checkstyle checks
// CHECKSTYLE:OFF
/**
* Convert the given alias to an expression
*
* @param <D>
* @return expression
*/
public static <D extends Expression<?>> D $() {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
public static <D> ArrayPath<D[], D> $(D[] arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<BigDecimal> $(BigDecimal arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<BigInteger> $(BigInteger arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static BooleanPath $(Boolean arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Byte> $(Byte arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <T>
* @return expression
*/
public static <T extends Enum<T>> EnumPath<T> $(T arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
public static <D> CollectionPath<D, SimpleExpression<D>> $(Collection<D> arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
public static <D extends Comparable<?>> ComparablePath<D> $(D arg) {
return Alias.getPath(arg);
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Double> $(Double arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Float> $(Float arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Integer> $(Integer arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static DatePath<java.sql.Date> $(java.sql.Date arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static DateTimePath<java.util.Date> $(java.util.Date arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
public static <D> ListPath<D, SimpleExpression<D>> $(List<D> arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Long> $(Long arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <K>
* @param <V>
* @return expression
*/
public static <K, V> MapPath<K, V, SimpleExpression<V>> $(Map<K, V> arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
public static <D> SetPath<D, SimpleExpression<D>> $(Set<D> arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static NumberPath<Short> $(Short arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static StringPath $(String arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static TimePath<Time> $(Time arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @return expression
*/
public static DateTimePath<Timestamp> $(Timestamp arg) {
return aliasFactory.getCurrentAndReset();
}
/**
* Convert the given alias to an expression
*
* @param arg alias
* @param <D>
* @return expression
*/
@SuppressWarnings("unchecked")
@Nullable
public static <D> EntityPathBase<D> $(D arg) {
EntityPathBase<D> rv = aliasFactory.getCurrentAndReset();
if (rv != null) {
return rv;
} else if (arg instanceof EntityPath<?>) {
return (EntityPathBase<D>) arg; // NOSONAR
} else if (arg instanceof ManagedObject) {
return (EntityPathBase<D>) ((ManagedObject) arg).__mappedPath();
} else {
return null;
}
}
@SuppressWarnings("unchecked")
@Nullable
private static <D, P extends Path<D>> P getPath(D arg) {
P rv = aliasFactory.getCurrentAndReset();
if (rv != null) {
return rv;
} else if (arg instanceof Path<?>) {
return (P) arg;
} else if (arg instanceof ManagedObject) {
return (P) ((ManagedObject) arg).__mappedPath();
} else {
return null;
}
}
// CHECKSTYLE:ON
/**
* Create a new alias proxy of the given type
*
* @param cl type of the alias
* @return alias instance
*/
public static <A> A alias(Class<A> cl) {
return alias(cl, CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_CAMEL, cl.getSimpleName()));
}
/**
* Create a new alias proxy of the given type for the given expression
*
* @param cl type of the alias
* @param expr underlying expression
* @return alias instance
*/
public static <A> A alias(Class<A> cl, Expression<? extends A> expr) {
return aliasFactory.createAliasForExpr(cl, expr);
}
/**
* Create a new alias proxy of the given type for the given variable
*
* @param cl type of the alias
* @param var variable name for the underlying expression
* @return alias instance
*/
public static <A> A alias(Class<A> cl, String var) {
return aliasFactory.createAliasForVariable(cl, var);
}
/**
* Convert the given alias to an expression
*
* @param <D>
* @param arg alias instance
* @return underlying expression
*/
@SuppressWarnings("unchecked")
public static <D> Expression<D> getAny(D arg) {
Expression<D> current = aliasFactory.getCurrentAndReset();
if (current != null) {
return current;
} else if (arg instanceof ManagedObject) {
return (Expression<D>) ((ManagedObject) arg).__mappedPath();
} else {
throw new IllegalArgumentException("No path mapped to " + arg);
}
}
/** Reset the alias */
public static void resetAlias() {
aliasFactory.reset();
}
/**
* Return the default variable
*
* @param <D>
* @return expression
*/
@SuppressWarnings("unchecked")
public static <D> SimplePath<D> var() {
return (SimplePath<D>) it;
}
/**
* Create a new variable path
*
* @param arg alias
* @param <D>
* @return expression
*/
@SuppressWarnings("unchecked")
public static <D extends Comparable<?>> ComparablePath<D> var(D arg) {
return Expressions.comparablePath((Class<D>) arg.getClass(), "var" + arg);
}
/**
* Create a new variable path
*
* @param arg alias
* @param <D>
* @return expression
*/
@SuppressWarnings("unchecked")
public static <D extends Number & Comparable<D>> NumberPath<D> var(D arg) {
return Expressions.numberPath(
(Class<D>) arg.getClass(), "var" + arg.getClass().getSimpleName() + arg);
}
/**
* Create a new variable path
*
* @param arg alias
* @param <D>
* @return expression
*/
@SuppressWarnings("unchecked")
public static <D> EntityPathBase<D> var(D arg) {
String var = "var" + arg.getClass().getSimpleName() + "_" + arg.toString().replace(' ', '_');
return new PathBuilder<D>((Class) arg.getClass(), var);
}
/**
* Create a new variable path
*
* @param arg alias
* @return expression
*/
public static StringPath var(String arg) {
return Expressions.stringPath(arg.replace(' ', '_'));
}
private Alias() {}
}