Chapter 22. String marshalling for String based @*Param

@PathParam, @QueryParam, @MatrixParam, @FormParam, and @HeaderParam are represented as Strings in a raw HTTP request. These injected parameter types can be converted into objects if they have a valueOf(String) static method, or a constructor that takes one String parameter. If you have a class with valueOf(), or the String constructor is inappropriate for your HTTP request, you can plug in RESTEasy's proprietary @Provider:

package org.jboss.resteasy.spi;

public interface StringConverter<T>
{
   T fromString(String str);
   String toString(T value);
}

package org.jboss.resteasy.spi;

public interface StringConverter<T>
{
   T fromString(String str);
   String toString(T value);
}

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This interface lets you use your own customized String marshalling. It is registered in web.xml under the resteasy.providers context-param. (See the Installation and Configuration chapter for details.) You can register it manually by calling the ResteasyProviderFactory.addStringConverter() method. A simple example of using the StringConverter follows:

   import org.jboss.resteasy.client.ProxyFactory;
   import org.jboss.resteasy.spi.StringConverter;
   import org.jboss.resteasy.test.BaseResourceTest;
   import org.junit.Assert;
   import org.junit.Before;
   import org.junit.Test;

   import javax.ws.rs.HeaderParam;
   import javax.ws.rs.MatrixParam;
   import javax.ws.rs.PUT;
   import javax.ws.rs.Path;
   import javax.ws.rs.PathParam;
   import javax.ws.rs.QueryParam;
   import javax.ws.rs.ext.Provider;

   public class StringConverterTest extends BaseResourceTest
   {
      public static class POJO
      {
         private String name;

         public String getName()
         {
            return name;
         }

         public void setName(String name)
         {
            this.name = name;
         }
      }

      @Provider
      public static class POJOConverter implements StringConverter<POJO>
      {
         public POJO fromString(String str)
         {
            System.out.println("FROM STRNG: " + str);
            POJO pojo = new POJO();
            pojo.setName(str);
            return pojo;
         }

         public String toString(POJO value)
         {
            return value.getName();
         }
      }

      @Path("/")
      public static class MyResource
      {
         @Path("{pojo}")
         @PUT
         public void put(@QueryParam("pojo")POJO q, @PathParam("pojo")POJO pp,
                         @MatrixParam("pojo")POJO mp, @HeaderParam("pojo")POJO hp)
         {
            Assert.assertEquals(q.getName(), "pojo");
            Assert.assertEquals(pp.getName(), "pojo");
            Assert.assertEquals(mp.getName(), "pojo");
            Assert.assertEquals(hp.getName(), "pojo");
         }
      }

      @Before
      public void setUp() throws Exception
      {
         dispatcher.getProviderFactory().addStringConverter(POJOConverter.class);
         dispatcher.getRegistry().addPerRequestResource(MyResource.class);
      }

      @Path("/")
      public static interface MyClient
      {
         @Path("{pojo}")
         @PUT
         void put(@QueryParam("pojo")POJO q, @PathParam("pojo")POJO pp,
                  @MatrixParam("pojo")POJO mp, @HeaderParam("pojo")POJO hp);
      }

      @Test
      public void testIt() throws Exception
      {
         MyClient client = ProxyFactory.create(MyClient.class, "http://localhost:8081");
         POJO pojo = new POJO();
         pojo.setName("pojo");
         client.put(pojo, pojo, pojo, pojo);
      }
   }

   import org.jboss.resteasy.client.ProxyFactory;
   import org.jboss.resteasy.spi.StringConverter;
   import org.jboss.resteasy.test.BaseResourceTest;
   import org.junit.Assert;
   import org.junit.Before;
   import org.junit.Test;

   import javax.ws.rs.HeaderParam;
   import javax.ws.rs.MatrixParam;
   import javax.ws.rs.PUT;
   import javax.ws.rs.Path;
   import javax.ws.rs.PathParam;
   import javax.ws.rs.QueryParam;
   import javax.ws.rs.ext.Provider;

   public class StringConverterTest extends BaseResourceTest
   {
      public static class POJO
      {
         private String name;

         public String getName()
         {
            return name;
         }

         public void setName(String name)
         {
            this.name = name;
         }
      }

      @Provider
      public static class POJOConverter implements StringConverter<POJO>
      {
         public POJO fromString(String str)
         {
            System.out.println("FROM STRNG: " + str);
            POJO pojo = new POJO();
            pojo.setName(str);
            return pojo;
         }

         public String toString(POJO value)
         {
            return value.getName();
         }
      }

      @Path("/")
      public static class MyResource
      {
         @Path("{pojo}")
         @PUT
         public void put(@QueryParam("pojo")POJO q, @PathParam("pojo")POJO pp,
                         @MatrixParam("pojo")POJO mp, @HeaderParam("pojo")POJO hp)
         {
            Assert.assertEquals(q.getName(), "pojo");
            Assert.assertEquals(pp.getName(), "pojo");
            Assert.assertEquals(mp.getName(), "pojo");
            Assert.assertEquals(hp.getName(), "pojo");
         }
      }

      @Before
      public void setUp() throws Exception
      {
         dispatcher.getProviderFactory().addStringConverter(POJOConverter.class);
         dispatcher.getRegistry().addPerRequestResource(MyResource.class);
      }

      @Path("/")
      public static interface MyClient
      {
         @Path("{pojo}")
         @PUT
         void put(@QueryParam("pojo")POJO q, @PathParam("pojo")POJO pp,
                  @MatrixParam("pojo")POJO mp, @HeaderParam("pojo")POJO hp);
      }

      @Test
      public void testIt() throws Exception
      {
         MyClient client = ProxyFactory.create(MyClient.class, "http://localhost:8081");
         POJO pojo = new POJO();
         pojo.setName("pojo");
         client.put(pojo, pojo, pojo, pojo);
      }
   }

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Chapter 22. String marshalling for String based @*Param

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