| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 |
| <<<<<<< Updated upstream |
| * |
| * https://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 |
| ======= |
| * |
| * https://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 |
| >>>>>>> Stashed changes |
| * limitations under the License. |
| */ |
| package javax.jdo.query; |
| |
| /** |
| * Representation of an expression in a query. |
| * |
| * @param <T> Java type being represented here |
| */ |
| public interface Expression<T> { |
| /** |
| * Method returning whether this expression equals the other expression. |
| * |
| * @param expr Other expression |
| * @return Whether they are equal |
| */ |
| BooleanExpression eq(Expression<?> expr); |
| |
| /** |
| * Method returning whether this expression equals the literal. |
| * |
| * @param t Literal |
| * @return Whether they are equal |
| */ |
| BooleanExpression eq(T t); |
| |
| /** |
| * Method returning whether this expression doesn't equal the other expression. |
| * |
| * @param expr Other expression |
| * @return Whether they are not equal |
| */ |
| BooleanExpression ne(Expression<?> expr); |
| |
| /** |
| * Method returning whether this expression doesn't equal the literal. |
| * |
| * @param t literal |
| * @return Whether they are not equal |
| */ |
| BooleanExpression ne(T t); |
| |
| /** |
| * Method to return a numeric expression representing the aggregated count of this expression. |
| * |
| * @return Numeric expression for the count |
| */ |
| NumericExpression<Long> count(); |
| |
| /** |
| * Method to return a numeric expression representing the aggregated (distinct) count of this |
| * expression. |
| * |
| * @return Numeric expression for the distinct count |
| */ |
| NumericExpression<Long> countDistinct(); |
| |
| /** |
| * Return an expression for whether this expression is an instanceof the supplied class. |
| * |
| * @param cls Class to check against |
| * @return Whether it is an instanceof |
| */ |
| BooleanExpression instanceOf(Class<?> cls); |
| |
| /** |
| * Return an expression where this expression is cast to the specified type. |
| * |
| * @param cls Class to cast to |
| * @return The cast expression |
| */ |
| <S> Expression<S> cast(Class<S> cls); |
| |
| /** |
| * Method to return an expression with the specified alias assigned to this expression. |
| * |
| * @param alias the alias for this expression |
| * @return the expression with an alias |
| */ |
| Expression<T> as(String alias); |
| } |