ResponseWriterAnnotationTest.java

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package com.sun.jersey.impl.resource;

import com.sun.jersey.impl.AbstractResourceTester;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Type;
import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

/**
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class ResponseWriterAnnotationTest extends AbstractResourceTester {
    @Provider
    @Produces("text/plain")
    public static class StringWriter implements MessageBodyWriter<String> {

        public boolean isWriteable(Class<?> c, Type t, Annotation[] as, MediaType mediaType) {
            assertTrue(findAnnotation(EntityAnnotation.class, as));
            return String.class == c;
        }

        public long getSize(String s, Class<?> type, Type genericType, Annotation[] as,
                MediaType mediaType) {
            assertTrue(findAnnotation(EntityAnnotation.class, as));
            return -1;
        }

        public void writeTo(String s, Class<?> c, Type t, Annotation[] as, 
                MediaType mt, MultivaluedMap<String, Object> headers, OutputStream out) 
                throws IOException, WebApplicationException {
            assertTrue(findAnnotation(EntityAnnotation.class, as));
            out.write(s.getBytes());
        }

        private boolean findAnnotation(Class<? extends Annotation> ac, Annotation[] as) {
            for (Annotation a : as) {
                if (a.annotationType() == ac) {
                    return true;
                }
            }
            return false;
        }
    }
    
    
    @Target({ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD})
    @Retention(RetentionPolicy.RUNTIME)
    public static @interface EntityAnnotation {}

    @Path("/")
    public static class Resource {
        @EntityAnnotation
        @GET
        public String get() {
            return "GET";
        }               
    }
        
    public ResponseWriterAnnotationTest(String testName) {
        super(testName);
    }
    
    public void testResponse() {
        initiateWebApplication(Resource.class, StringWriter.class);
        
        assertEquals("GET", resource("/").get(String.class));
    }
}