/*
 * 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
 * 
 *     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.
 *
 * $Header:$
 */
package org.apache.beehive.controls.api.versioning;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 *  Specifies the maximum version of the control interface that this implementation
 *  supports.  Allowed on control implementations (interfaces annotated with
 *  <sp>@ControlImplementation).  This version requirement is enforced at compile time
 *  of the implementation, and at runtime when the implementation is classloaded.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface VersionSupported
{
    /**
     * The major version of the control interface that this implementation
     * supports.  Any version number less than or equal to this value will suffice,
     * implying that this constraint is only valid when backwards compatibility
     * is part of the contract when increasing the version number.  Negative
     * values mean that any major version is acceptable (in which case this
     * annotation should probably just not be
     * present).
     */
    int major(); 

    /**
     * The minor version of the control interface that this implementation
     * supports.  Any version number less than or equal to this value will suffice.
     * Negative values mean that any minor version is acceptable (the default case).
     */
    int minor() default -1;
}
