src/main/java/com/amazon/carbonado/AlternateKeys.java


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/*
 * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
 * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
 * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
 *
 * 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.amazon.carbonado;

import java.lang.annotation.*;

/**
 * List of alternate keys for a {@link Storable}.
 *
 * <p>Example:<pre>
 * <b>&#64;AlternateKeys</b>({
 *     <b>&#64;Key</b>("fullPath")
 *     <b>&#64;Key</b>({"+name", "-parentID"})
 * })
 * &#64;PrimaryKey("ID")
 * public interface FileInfo extends Storable&lt;FileInfo&gt; {
 *     long getID();
 *
 *     String getFullPath();
 *
 *     String getName();
 *
 *     long getParentID();
 *
 *     ...
 * }
 * </pre>
 *
 * @author Brian S O'Neill
 * @see Key
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface AlternateKeys {
    /**
     * A list of Key annotations.
     */
    Key[] value() default {};
}