javax.ws.rs.ext.ParamConverterProvider Maven / Gradle / Ivy

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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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package javax.ws.rs.ext;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

/**
 * Contract for a provider of {@link ParamConverter} instances.
 * 
 * Providers implementing {@code ParamConverterProvider} contract must be either programmatically
 * registered in a JAX-RS runtime or must be annotated with
 * {@link javax.ws.rs.ext.Provider @Provider} annotation to be automatically discovered
 * by the JAX-RS runtime during a provider scanning phase.
 * 
 *
 * @author Marek Potociar
 */
public interface ParamConverterProvider {

    /**
     * Obtain a {@link ParamConverter} that can provide from/to string conversion
     * for an instance of a particular Java type.
     *
     * @param          the supported Java type convertible to/from a {@code String} format.
     * @param rawType     the raw type of the object to be converted.
     * @param genericType the type of object to be converted. E.g. if an String value
     *                    representing the injected request parameter
     *                    is to be converted into a method parameter, this will be the
     *                    formal type of the method parameter as returned by {@code Class.getGenericParameterTypes}.
     * @param annotations an array of the annotations associated with the convertible
     *                    parameter instance. E.g. if a string value is to be converted into a method parameter,
     *                    this would be the annotations on that parameter as returned by
     *                    {@link java.lang.reflect.Method#getParameterAnnotations}.
     * @return the string converter, otherwise {@code null}.
     */
    public  ParamConverter getConverter(Class rawType, Type genericType, Annotation annotations[]);
}