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package javax.ws.rs.ext;

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;

import javax.ws.rs.DefaultValue;

/**
 * Defines a contract for a delegate responsible for converting between a
 * {@code String} form of a message parameter value and the corresponding custom
 * Java type {@code T}.
 *
 * Conversion of message parameter values injected via
 * {@link javax.ws.rs.PathParam @PathParam}, {@link javax.ws.rs.QueryParam @QueryParam},
 * {@link javax.ws.rs.MatrixParam @MatrixParam}, {@link javax.ws.rs.FormParam @FormParam},
 * {@link javax.ws.rs.CookieParam @CookieParam} and {@link javax.ws.rs.HeaderParam @HeaderParam}
 * is supported.
 * 

* By default, when used for injection of parameter values, a selected {@code ParamConverter} * instance MUST be used eagerly by a JAX-RS runtime to convert any {@link DefaultValue * default value} in the resource or provider model, that is during the application deployment, * before any value – default or otherwise – is actually required. * This conversion strategy ensures that any errors in the default values are reported * as early as possible. * This default behavior may be overridden by annotating the {@code ParamConverter} * implementation class with a {@link Lazy @Lazy} annotation. In such case any default * value conversion delegated to the {@code @Lazy}-annotated converter will be deferred * to a latest possible moment (i.e. until the injection of such default value is required). *

*

* NOTE: A service implementing this contract is not recognized as a registrable * JAX-RS extension provider. Instead, a {@link ParamConverterProvider} instance * responsible for providing {@code ParamConverter} instances has to be registered * as one of the JAX-RS extension providers. *

* * @param the supported Java type convertible to/from a {@code String} format. * @author Marek Potociar * @since 2.0 */ public interface ParamConverter { /** * Mandates that a conversion of any {@link DefaultValue default value} delegated * to a {@link ParamConverter parameter converter} annotated with {@code @Lazy} * annotation SHOULD occur only once the value is actually required (e.g. to be * injected for the first time). * * @since 2.0 */ @Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public static @interface Lazy { } /** * Parse the supplied value and create an instance of {@code T}. * * @param value the string value. * @return the newly created instance of {@code T}. * * @throws IllegalArgumentException if the supplied string cannot be * parsed or is {@code null}. */ public T fromString(String value); /** * Convert the supplied value to a String. *

* This method is reserved for future use. Proprietary JAX-RS extensions may leverage the method. * Users should be aware that any such support for the method comes at the expense of producing * non-portable code. *

* * @param value the value of type {@code T}. * @return a String representation of the value. * * @throws IllegalArgumentException if the supplied object cannot be * serialized or is {@code null}. */ public String toString(T value); }




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