src/jsr311-api/src/javax/ws/rs/HeaderParam.java

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/*
 * 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 <code>T</code> of the annotated parameter, field or property 
 * must either:
 * <ol>
 * <li>Be a primitive type</li>
 * <li>Have a constructor that accepts a single <code>String</code> argument</li>
 * <li>Have a static method named <code>valueOf</code> or <code>fromString</code>
 * that accepts a single 
 * <code>String</code> argument (see, for example, {@link Integer#valueOf(String)})</li>
 * <li>Be <code>List&lt;T&gt;</code>, <code>Set&lt;T&gt;</code> or 
 * <code>SortedSet&lt;T&gt;</code>, where <code>T</code> satisfies 2 or 3 above.
 * The resulting collection is read-only.</li>
 * </ol>
 * 
 * <p>If the type is not one of those listed in 4 above then the first value 
 * (lexically) of the header is used.</p>
 *
 * <p>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.</p>
 *
 * @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();
}