GenericTypeAndEntityTest.java

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package com.sun.jersey.impl.entity;

import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.impl.AbstractResourceTester;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

/**
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class GenericTypeAndEntityTest extends AbstractResourceTester {
    public GenericTypeAndEntityTest(String testName) {
        super(testName);
    }

    @Provider
    public static class ListIntegerWriter implements MessageBodyWriter<List<Integer>> {
        private final Type t;
        
        public ListIntegerWriter() {
            List<Integer> l = new ArrayList<Integer>();
            GenericEntity<List<Integer>> ge = new GenericEntity<List<Integer>>(l) {};
            this.t = ge.getType();
        }
        
        public boolean isWriteable(Class<?> c, Type t, Annotation[] as, MediaType mt) {
            return this.t.equals(t);
        }

        public long getSize(List<Integer> l, Class<?> type, Type genericType, Annotation annotations[], MediaType mediaType) {
            return -1;
        }

        public void writeTo(List<Integer> l, Class<?> c, Type t, Annotation[] as, 
                MediaType mt, MultivaluedMap<String, Object> hs, 
                OutputStream out) throws IOException, WebApplicationException {
            StringBuffer sb = new StringBuffer();
            for (Integer i : l) {
                if (sb.length() > 0) sb.append(", ");
                sb.append(i);
            }
            out.write(sb.toString().getBytes());
        }
        
    }
    
    @Path("/")
    public static class ListResource {
        @GET
        @Path("type")
        public List<Integer> type() {
            return Arrays.asList(1, 2, 3, 4);
        }
        
        @GET
        @Path("genericEntity")
        public GenericEntity<List<Integer>> genericEntity() {
            return new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {};
        }
        
        @GET
        @Path("object")
        public Object object() {
            return new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {};
        }
        
        @GET
        @Path("response")
        public Response response() {
            return Response.ok(new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {}).
                    build();
        }
    }
    
    @Path("/")
    public static class ListResourceWithMediaType {
        @GET
        @Path("type")
        @Produces("text/plain")
        public List<Integer> type() {
            return Arrays.asList(1, 2, 3, 4);
        }
        
        @GET
        @Path("genericEntity")
        @Produces("text/plain")
        public GenericEntity<List<Integer>> genericEntity() {
            return new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {};
        }
        
        @GET
        @Path("object")
        @Produces("text/plain")
        public Object object() {
            return new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {};
        }
        
        @GET
        @Path("response")
        @Produces("text/plain")
        public Response response() {
            return Response.ok(new GenericEntity<List<Integer>>(Arrays.asList(1, 2, 3, 4)) {}).
                    build();
        }
    }
    
    public void testGenericType() {
        initiateWebApplication(ListResource.class, ListIntegerWriter.class);        
        
        String content = "1, 2, 3, 4";
        
        WebResource r = resource("/");
                
        assertEquals(content, r.path("type").get(String.class));
        assertEquals(content, r.path("genericEntity").get(String.class));
        assertEquals(content, r.path("object").get(String.class));
        assertEquals(content, r.path("response").get(String.class));
    }   
    
    public void testGenericTypeWithMediaType() {
        initiateWebApplication(ListResourceWithMediaType.class, ListIntegerWriter.class);        
        
        String content = "1, 2, 3, 4";
        
        WebResource r = resource("/");
                
        assertEquals(content, r.path("type").get(String.class));
        assertEquals(content, r.path("genericEntity").get(String.class));
        assertEquals(content, r.path("object").get(String.class));
        assertEquals(content, r.path("response").get(String.class));
    }   
}