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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} of the annotated parameter, field or property must either: * *

    *
  1. Be a primitive type *
  2. Have a constructor that accepts a single {@code String} argument *
  3. Have a static method named {@code valueOf} or {@code fromString} that accepts a single * {@code String} argument (see, for example, {@link Integer#valueOf(String)}) *
  4. Have a registered implementation of {@link javax.ws.rs.ext.ParamConverterProvider} JAX-RS * extension SPI that returns a {@link javax.ws.rs.ext.ParamConverter} instance capable of a * "from string" conversion for the type. *
  5. Be {@code List}, {@code Set} or {@code SortedSet}, where {@code T} satisfies 2, 3 * or 4 above. The resulting collection is read-only. *
* *

If the type is not one of the collection types listed in 5 above and the header parameter is * represented by multiple values then the first value (lexically) of the parameter 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. * * @author Paul Sandoz * @author Marc Hadley * @see DefaultValue * @see javax.ws.rs.core.HttpHeaders * @since 1.0 */ @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(); }





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