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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at
 * http://www.opensource.org/licenses/cddl1.php
 * See the License for the specific language governing
 * permissions and limitations under the License.
 */

/*
 * HeaderParam.java
 *
 * Created on January 24, 2007, 2:33 PM
 *
 */

package javax.ws.rs;

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;

/**
 * Binds the value(s) of a HTTP header to a resource method parameter, 
 * resource class field, or resource class bean property. A default value 
 * can be specified using the {@link DefaultValue} annotation.
 * 
 * The type T of the annotated parameter, field or property 
 * must either:
 * 
 * Be a primitive type
 * Have a constructor that accepts a single String argument
 * Have a static method named valueOf or fromString
 * that accepts a single 
 * String argument (see, for example, {@link Integer#valueOf(String)})
 * Be List<T>, Set<T> or 
 * SortedSet<T>, where T satisfies 2 or 3 above.
 * The resulting collection is read-only.
 * 
 * 
 * If the type is not one of those listed in 4 above then the first value 
 * (lexically) of the header is used.
 *
 * Because injection occurs at object creation time, use of this annotation 
 * on resource class fields and bean properties is only supported for the 
 * default per-request resource class lifecycle. Resource classes using 
 * other lifecycles should only use this annotation on resource method
 * parameters.
 *
 * @see DefaultValue
 * @see javax.ws.rs.core.HttpHeaders
 */
@Target({ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface HeaderParam {
    /**
     * Defines the name of the HTTP header whose value will be used
     * to initialize the value of the annotated method argument, class field or
     * bean property. Case insensitive.
     */
    String value();
}