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Cassandra support for Spring Data
/*
* Copyright 2013-2020 the original author or authors.
*
* 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
*
* 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
* limitations under the License.
*/
package org.springframework.data.cassandra.repository;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.data.annotation.QueryAnnotation;
/**
* Annotation to declare finder queries directly on repository methods.
*
* @author Alex Shvid
* @author Matthew T. Adams
* @author Mark Paluch
*/
@Documented
@Target({ ElementType.ANNOTATION_TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@QueryAnnotation
public @interface Query {
/**
* A Cassandra CQL3 string to define the actual query to be executed. Placeholders {@code ?0}, {@code ?1}, etc are
* supported.
*/
String value() default "";
/**
* Specifies whether to allow filtering using query derivation without a {@link #value() string query}.
*
* @since 2.0
*/
boolean allowFiltering() default false;
/**
* Specifies whether the {@link #value() CQL query} is
* {@link com.datastax.oss.driver.api.core.cql.Statement#isIdempotent}. {@code SELECT} statements are considered
* {@link Idempotency#IDEMPOTENT idempotent} by default.
*
* @since 2.2
*/
Idempotency idempotent() default Idempotency.UNDEFINED;
/**
* Returns whether the defined query should be executed as a count projection.
*
* @since 2.1
*/
boolean count() default false;
/**
* Returns whether the defined query should be executed as an exists projection.
*
* @since 2.1
*/
boolean exists() default false;
/**
* Enumeration to define statement idempotency.
*
* @since 2.2
*/
enum Idempotency {
/**
* Undefined state (default for all non-{@code SELECT} statements. Leaves
* {@link com.datastax.oss.driver.api.core.cql.Statement#setIdempotent(boolean)} state unchanged.
*/
UNDEFINED,
/**
* Statement considered idempotent.
*/
IDEMPOTENT,
/**
* Statement considered non-idempotent. Sets
* {@link com.datastax.oss.driver.api.core.cql.Statement#setIdempotent(boolean)} to {@code false}.
*/
NON_IDEMPOTENT
}
}