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This project is about configuration of applications and about parameterization of Objects. This library offers annotations (and annotation processors), parsers, typing, observing changes, serialization, cloning and more when working with settings and/or object parameters. Settings and its features can be declared using an xml format. The library offers syntax support for settings and parameters in a loosely coupled manner. You are not restricted to built in syntax, you can provide your own. At runtime this library tracks keys for which a default is used because they are not found in settings. Also it tracks unused keys. You can stack features for settings such as caching, preparing keys and values, readonlyness, threadsafety, helpsupport, reading / parsing from input. You can easily develop your own features for settings.

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/*
 * Copyright 2015 VectorPrint.
 *
 * 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.vectorprint.configuration.cdi;

/*
 * #%L
 * Config
 * %%
 * Copyright (C) 2015 VectorPrint
 * %%
 * 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.
 * #L%
 */

import javax.enterprise.util.Nonbinding;
import javax.inject.Qualifier;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Use together with @Inject, {@link CDIProperties} will provide values;
 * @author Eduard Drenth at VectorPrint.nl
 */
@Qualifier
@Retention(RUNTIME)
@Target({FIELD,ElementType.METHOD,ElementType.PARAMETER})
public @interface Property {
   
    /**
     * one or more keys to lookup a setting, the first setting found will be used.
     * @return 
     */
   @Nonbinding String[] keys() default {};

    /**
     * NOTE when a default value is set this setting has no effect
     * @return
     */
   @Nonbinding boolean required() default true;

    /**
     * You can set one or more default values as Strings which will be converted to the correct type when that type is supported.
     * @return
     */
   @Nonbinding String[] defaultValue() default {};

}