Reworking the Actions parameter object per the updated Action Handlers

spec (http://tools.ietf.org/html/draft-snell-activitystreams-actions-05)
2014-05-01 21:08:10 -07:00 · 2014-05-01 21:08:10 -07:00 · 478d497d1a
parent f01e302aa2
commit 478d497d1a
20 changed files with 1235 additions and 1028 deletions
--- a/actions/pom.xml
+++ b/actions/pom.xml
@ -134,5 +134,9 @@
        <artifactId>activitystreams-core</artifactId>
        <version>0.0.1-SNAPSHOT</version>
      </dependency>
+      <dependency>
+        <groupId>junit</groupId>
+        <artifactId>junit</artifactId>
+      </dependency>
    </dependencies>
 </project>
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionHandler.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionHandler.java
@ -43,6 +43,10 @@ public abstract class ActionHandler
    private final Authentication.Builder auth = 
      Authentication.make();
    
+    public Builder() {
+      writeUsing(ActionMakers.io);
+    }
+    
    /**
     * Method confirm.
     * @return B
@ -361,4 +365,5 @@ public abstract class ActionHandler
    return auth != null ?
      (A)auth.get(key) : null;
  }
+
 }
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionMakers.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionMakers.java
@ -24,11 +24,18 @@ package com.ibm.common.activitystreams.actions;
 import static com.ibm.common.activitystreams.Makers.object;

 import com.ibm.common.activitystreams.ASObject;
+import com.ibm.common.activitystreams.IO;
+import com.ibm.common.activitystreams.actions.ParameterValue.SimpleParameterValue;

 /**
 */
 public final class ActionMakers {

+  public static final IO io = 
+    IO.makeDefault(ActionsModule.instance);
+  public static final IO ioPretty = 
+    IO.makeDefaultPrettyPrint(ActionsModule.instance);
+  
  public static final String TARGET_NONE = "NONE";
  public static final String TARGET_DEFAULT = "DEFAULT";
  public static final String TARGET_NEW = "NEW";
@ -220,7 +227,7 @@ public final class ActionMakers {
   * @param id String
   * @return Parameter.Builder
   */
-  public static Parameter.Builder parameter(String id) {
-    return parameter().id(id);
+  public static SimpleParameterValue parameter(String id) {
+    return new SimpleParameterValue.Builder().type(id).get();
  }
 }
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionsModule.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ActionsModule.java
@ -22,7 +22,6 @@
 package com.ibm.common.activitystreams.actions;

 import static com.ibm.common.activitystreams.actions.Adapters.AUTH;
-import static com.ibm.common.activitystreams.actions.Adapters.PARAMETERS;
 import static com.ibm.common.activitystreams.actions.Adapters.STYLES;

 import com.ibm.common.activitystreams.IO.Builder;
@ -47,10 +46,10 @@ public final class ActionsModule
           .hierarchicalAdapter(IntentActionHandler.class,base)
           .hierarchicalAdapter(EmbedActionHandler.class,base)
           .hierarchicalAdapter(HtmlForm.class,base)
+           .hierarchicalAdapter(ParametersValue.class, ParametersAdapter.instance)
+           .hierarchicalAdapter(ParameterValue.class, ParameterAdapter.instance)
           .hierarchicalAdapter(UrlTemplate.class,base)
           .hierarchicalAdapter(TypedPayload.class,base)
-           .hierarchicalAdapter(Parameter.class,base)
-           .hierarchicalAdapter(ParametersValue.class, PARAMETERS)
           .hierarchicalAdapter(Authentication.class, AUTH)
           .hierarchicalAdapter(StylesValue.class, STYLES);
  }
@ -58,7 +57,6 @@ public final class ActionsModule
  @Override
  public void apply(Schema.Builder builder) {
    builder.map("HtmlForm", withParameters.template(HtmlForm.class, HtmlForm.Builder.class))
-      .map("parameter", parameter)
      .map("TypedPayload", typedPayload)
      .map("UrlTemplate", withParameters.template(UrlTemplate.class, UrlTemplate.Builder.class))
      .map("HttpActionHandler", actionHandler.template(HttpActionHandler.class, HttpActionHandler.Builder.class))
@ -89,15 +87,11 @@ public final class ActionsModule
    public final static Model typedPayload =
      Model
        .make("object")
+        .type(TypedPayload.class, TypedPayload.Builder.class)
        .linkValue("schema")
        .typeValue("type")
        .get();
        
-    public final static Model parameter = 
-      Model
-        .make("object")
-        .typeValue("type")
-        .type(Parameter.class, Parameter.Builder.class)
-        .get();
+
    
 }
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/Adapters.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/Adapters.java
@ -42,17 +42,6 @@ final class Adapters {
      }
    };
    
-    static final Adapter<ParametersValue> PARAMETERS =
-      new AbstractDictionaryObjectAdapter
-       <TypeValue,
-        ParametersValue,
-        ParametersValue.Builder>(TypeValue.class) {
-      @Override
-      protected ParametersValue.Builder builder() {
-        return ParametersValue.make();
-      }
-    };
-    
    static final Adapter<StylesValue> STYLES  =
      new AbstractDictionaryObjectAdapter
        <String,
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/Authentication.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/Authentication.java
@ -47,6 +47,10 @@ public final class Authentication
    extends AbstractDictionaryObject.AbstractBuilder<
      ASObject,Authentication,Builder> {

+    public Builder() {
+      writeUsing(ActionMakers.io);
+    }
+    
    /**
     * Method get.
     * @return Authentication
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/HtmlForm.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/HtmlForm.java
@ -29,6 +29,7 @@ import java.io.ObjectStreamException;
 import com.google.common.base.Supplier;
 import com.ibm.common.activitystreams.ASObject;
 import com.ibm.common.activitystreams.TypeValue;
+import com.ibm.common.activitystreams.actions.UrlTemplate.Builder;

 /**
 */
@ -51,86 +52,28 @@ public final class HtmlForm
    private final ParametersValue.Builder params = 
      ParametersValue.make();
    
-    private Builder() {
+    public Builder() {
+      writeUsing(ActionMakers.io);
      objectType("HtmlForm");
      mediaType("application/x-www-form-urlencoded");
    }
    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @return Builder
-     */
-    public Builder parameter(
-      String name, 
-      String iri) {
-      params.set(name, type(iri));
+    public Builder parameter(String name, String iri) {
+      params.param(name, iri);
      return this;
    }
    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @param required boolean
-     * @return Builder
-     */
    public Builder parameter(
      String name, 
-      String iri, 
-      boolean required) {
-      return parameter(
-        name, 
-          object()
-          .id(iri)
-          .set("required", required));
+      ParameterValue parameter) {
+        params.param(name, parameter);
+        return this;
    }
    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @param required boolean
-     * @param value Object
-     * @return Builder
-     */
    public Builder parameter(
      String name, 
-      String iri, 
-      boolean required, 
-      Object value) {
-      return parameter(
-        name,
-        object()
-          .id(iri)
-          .set("required", required)
-          .set("value", value));
-    }
-    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param lv TypeValue
-     * @return Builder
-     */
-    public Builder parameter(
-      String name, 
-      TypeValue lv) {
-      params.set(name, lv);
-      return this;
-    }
-    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param lv Supplier<? extends TypeValue>
-     * @return Builder
-     */
-    public Builder parameter(
-      String name, 
-      Supplier<? extends TypeValue> lv) {
-      return parameter(name, lv.get());
+      Supplier<? extends ParameterValue> parameter) {
+        return parameter(name, parameter.get());
    }
    
    /**
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/Parameter.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/Parameter.java
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ParameterAdapter.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ParameterAdapter.java
@ -0,0 +1,260 @@
+package com.ibm.common.activitystreams.actions;
+
+import java.lang.reflect.Type;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.collect.Iterables;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.ibm.common.activitystreams.ASObject;
+import com.ibm.common.activitystreams.NLV;
+import com.ibm.common.activitystreams.actions.ParameterValue.SimpleParameterValue;
+import com.ibm.common.activitystreams.internal.Adapter;
+
+public final class ParameterAdapter 
+  extends Adapter<ParameterValue> {
+
+  public static final ParameterAdapter instance = 
+    new ParameterAdapter();
+
+  @Override
+  public JsonElement serialize(
+    ParameterValue src, 
+    Type typeOfSrc,
+    JsonSerializationContext context) {
+    
+    if (src == null) return null;
+    switch(src.valueType()) {
+    case OBJECT:
+      if (src instanceof Parameter) {
+        Parameter parameter = (Parameter) src;
+        JsonObject obj = new JsonObject();
+        if (parameter.has("type")) {
+          String type = parameter.type();
+          if (type != null)
+            obj.addProperty("type", type);
+        }
+        if (parameter.has("displayName")) {
+          NLV nlv = parameter.displayName();
+          if (nlv != null)
+            obj.add("displayName", context.serialize(nlv, NLV.class));
+        }
+        if (parameter.has("placeholder")) {
+          NLV nlv = parameter.placeholder();
+          if (nlv != null)
+            obj.add("placeholder", context.serialize(nlv, NLV.class));
+        }
+        if (parameter.has("enumeration")) {
+          Iterable<Object> e = parameter.enumeration();
+          if (e != null)
+            obj.add("enumeration", context.serialize(e,e.getClass()));
+        }
+        if (parameter.has("language")) {
+          String lang = parameter.language();
+          if (lang != null)
+            obj.addProperty("language", lang);
+        }
+        if (parameter.has("maxInclusive")) {
+          Object max = parameter.maxInclusive();
+          if (max != null)
+            obj.add("maxInclusive", context.serialize(max, max.getClass()));
+        }
+        if (parameter.has("maxExclusive")) {
+          Object max = parameter.maxExclusive();
+          if (max != null)
+            obj.add("maxExclusive", context.serialize(max, max.getClass()));
+        }
+        if (parameter.has("minInclusive")) {
+          Object max = parameter.minInclusive();
+          if (max != null)
+            obj.add("minInclusive", context.serialize(max, max.getClass()));
+        }
+        if (parameter.has("minExclusive")) {
+          Object max = parameter.minExclusive();
+          if (max != null)
+            obj.add("minExclusive", context.serialize(max, max.getClass()));
+        }
+        if (parameter.has("pattern")) {
+          Iterable<String> pattern = parameter.pattern();
+          if (pattern != null) {
+            if (Iterables.size(pattern) == 0) {
+              String first = Iterables.getFirst(pattern, null);
+              if (first != null)
+                obj.addProperty("pattern", first);
+            } else 
+              obj.add("pattern", context.serialize(pattern, pattern.getClass()));
+          }
+        }
+        if (parameter.has("repeated")) {
+          boolean repeated = parameter.repeated();
+          if (repeated)
+            obj.addProperty("repeated", repeated);
+        }
+        if (parameter.has("required")) {
+          boolean required = parameter.required();
+          if (!required)
+            obj.addProperty("required", required);
+        }
+        if (parameter.has("step")) {
+          Number n = parameter.step();
+          if (n != null)
+            obj.add("step", context.serialize(n,n.getClass()));
+        }
+        if (parameter.has("default")) {
+          Object def = parameter.defaultValue();
+          if (def != null) 
+            obj.add("default",context.serialize(def, def.getClass()));
+        }
+        if (parameter.has("minLength")) {
+          int len = parameter.minLength();
+          if (len > -1)
+            obj.addProperty("minLength", len);
+        }
+        if (parameter.has("maxLength")) {
+          int len = parameter.maxLength();
+          if (len > -1)
+            obj.addProperty("maxLength", len);
+        }
+        if (parameter.has("totalDigits")) {
+          int len = parameter.totalDigits();
+          if (len > -1)
+            obj.addProperty("totalDigits", len);
+        }
+        if (parameter.has("fractionDigits")) {
+          int len = parameter.fractionDigits();
+          if (len > -1)
+            obj.addProperty("fractionDigits", len);
+        }
+        if (parameter.has("value")) {
+          Object val = parameter.value();
+          if (val != null)
+            obj.add("value", context.serialize(val, val.getClass()));
+        }
+        return obj;
+      } else if (src instanceof UrlTemplate) {
+        return context.serialize(src, UrlTemplate.class);
+      } else if (src instanceof TypedPayload) {
+        return context.serialize(src, TypedPayload.class);
+      } else if (src instanceof ASObject) {
+        return context.serialize(src, ASObject.class);
+      } else throw new IllegalArgumentException();
+    case SIMPLE:
+      SimpleParameterValue spv = (SimpleParameterValue) src;
+      return context.serialize(spv.type(), String.class);
+    default:
+      throw new IllegalArgumentException();
+    }
+  }
+
+  private Object deserialize(
+    JsonDeserializationContext context,
+    JsonElement el) {
+      if (el.isJsonArray()) {
+        return context.deserialize(el, Iterable.class);
+      } else if (el.isJsonObject()) {
+        return context.deserialize(el, ASObject.class);
+      } else if (el.isJsonPrimitive()) {
+        JsonPrimitive p = el.getAsJsonPrimitive();
+        if (p.isBoolean())
+          return p.getAsBoolean();
+        else if (p.isNumber())
+          return p.getAsNumber();
+        else
+          return p.getAsString();
+      } else return null;
+  }
+  
+  @Override
+  public ParameterValue deserialize(
+    JsonElement json, 
+    Type typeOfT,
+    JsonDeserializationContext context) 
+      throws JsonParseException {
+
+    checkArgument(json.isJsonPrimitive() || json.isJsonObject());
+    
+    if (json.isJsonPrimitive()) {
+      JsonPrimitive jp = json.getAsJsonPrimitive();
+      checkArgument(jp.isString());
+      return ActionMakers.parameter(jp.getAsString());
+    } else {
+      JsonObject obj = json.getAsJsonObject();
+      if (obj.has("objectType")) {
+        ASObject as = context.deserialize(obj, ASObject.class);
+        checkArgument(as instanceof ParameterValue);
+        return (ParameterValue) as;
+      } else {
+        Parameter.Builder builder =
+          ActionMakers.parameter();
+        if (obj.has("default"))
+          builder.defaultValue(
+            deserialize(context, obj.get("default")));
+        if (obj.has("displayName"))
+          builder.displayName(
+            context.<NLV>deserialize(
+              obj.get("displayName"), 
+              NLV.class));
+        if (obj.has("enumeration"))
+          builder.enumeration(
+            context.<Iterable<?>>deserialize(
+              obj.get("enumeration"), 
+              Iterable.class));
+        if (obj.has("fractionDigits"))
+          builder.fractionDigits(
+            obj.get("fractionDigits").getAsInt());
+        if (obj.has("language"))
+          builder.language(
+            obj.get("language").getAsString());
+        if (obj.has("maxExclusive"))
+          builder.maxExclusive(
+            deserialize(context, obj.get("maxExclusive")));
+        if (obj.has("maxInclusive"))
+          builder.maxInclusive(
+              deserialize(context, obj.get("maxInclusive")));
+        if (obj.has("minExclusive"))
+          builder.minExclusive(
+              deserialize(context, obj.get("minExclusive")));
+        if (obj.has("minInclusive"))
+          builder.minInclusive(
+            deserialize(context, obj.get("minInclusive")));
+        if (obj.has("maxLength"))
+          builder.maxLength(
+            obj.get("maxLength").getAsInt());
+        if (obj.has("minLength"))
+          builder.minLength(
+            obj.get("minLength").getAsInt());
+        if (obj.has("pattern"))
+          builder.pattern(
+            context.<Iterable<String>>deserialize(
+              obj.get("pattern"), Iterable.class));
+        if (obj.has("placeholder"))
+          builder.placeholder(
+            context.<NLV>deserialize(
+              obj.get("placeholder"), NLV.class));
+        if (obj.has("repeated") && obj.get("repeated").getAsBoolean())
+            builder.repeated();
+        if (obj.has("required") && !obj.get("required").getAsBoolean())
+            builder.optional();
+        if (obj.has("step")) 
+          builder.step(
+            obj.get("step").getAsNumber());
+        if (obj.has("totalDigits")) 
+          builder.totalDigits(
+            obj.get("totalDigits").getAsInt());
+        if (obj.has("type"))
+          builder.type(
+            obj.get("type").getAsString());
+        if (obj.has("value"))
+          builder.value(
+              deserialize(context, obj.get("value")));
+        return builder.get();
+      }
+    }
+  }
+
+}
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ParameterValue.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ParameterValue.java
@ -0,0 +1,99 @@
+package com.ibm.common.activitystreams.actions;
+
+import java.io.Serializable;
+
+import com.ibm.common.activitystreams.IO;
+import com.ibm.common.activitystreams.ValueType;
+import com.ibm.common.activitystreams.Writable;
+import com.ibm.common.activitystreams.util.AbstractWritable;
+import com.sun.org.apache.xalan.internal.utils.Objects;
+
+public interface ParameterValue
+  extends Writable, Serializable {
+
+  ValueType valueType();
+  
+  String toString(IO io);
+  
+  public static final class SimpleParameterValue 
+    extends AbstractWritable 
+    implements ParameterValue {
+
+    static final class Builder 
+      extends AbstractWritable.AbstractWritableBuilder<SimpleParameterValue,Builder> {
+
+      private String type;
+      
+      public Builder() {
+        writeUsing(ActionMakers.io);
+      }
+      
+      public Builder type(String type) {
+        this.type = type;
+        return this;
+      }
+      
+      @Override
+      public SimpleParameterValue get() {
+        return new SimpleParameterValue(this);
+      }
+      
+    }
+    
+    private final String type;
+    
+    private SimpleParameterValue(Builder b) {
+      super(b);
+      this.type = b.type;
+    }
+    
+    public ValueType valueType() {
+      return ValueType.SIMPLE;
+    }
+    
+    public String type() {
+      return type;
+    }
+
+    @Override
+    public int hashCode() {
+      return Objects.hashCode(type);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj)
+        return true;
+      if (obj == null)
+        return false;
+      if (getClass() != obj.getClass())
+        return false;
+      SimpleParameterValue other = (SimpleParameterValue) obj;
+      return Objects.equals(type,other.type);
+    }
+    
+    public String toString(IO io) {
+      return super.toString(io);
+    }
+    
+    Object writeReplace() throws java.io.ObjectStreamException {
+      return new SerializedForm(this);
+    }
+    
+    private static class SerializedForm 
+      implements Serializable {
+      private static final long serialVersionUID = -1975376657749952999L;
+      private String type;
+      SerializedForm(SimpleParameterValue obj) {
+        this.type = obj.type;
+      }
+    
+      Object readResolve() 
+        throws java.io.ObjectStreamException {
+          return new SimpleParameterValue.Builder().type(type).get();
+      }
+    } 
+
+  }
+  
+}
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ParametersAdapter.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ParametersAdapter.java
@ -0,0 +1,57 @@
+package com.ibm.common.activitystreams.actions;
+
+import java.lang.reflect.Type;
+import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSerializationContext;
+import com.ibm.common.activitystreams.internal.Adapter;
+
+public final class ParametersAdapter 
+  extends Adapter<ParametersValue> {
+
+  public static final ParametersAdapter instance = 
+    new ParametersAdapter();
+  
+  @Override
+  public JsonElement serialize(
+    ParametersValue params, 
+    Type type,
+    JsonSerializationContext context) {
+    if (params == null) return null;
+    JsonObject obj = new JsonObject();
+    for (String param : params) {
+      obj.add(
+        param, 
+        context.serialize(
+          params.get(param), 
+          ParameterValue.class));
+    }
+    return obj;
+  }
+
+  @Override
+  public ParametersValue deserialize(
+    JsonElement json, 
+    Type type,
+    JsonDeserializationContext context) 
+      throws JsonParseException {
+    checkArgument(json.isJsonObject());
+    JsonObject obj = json.getAsJsonObject();
+    ParametersValue.Builder builder =
+      ParametersValue.make();
+    for (Map.Entry<String,JsonElement> entry : obj.entrySet())
+      builder.param(
+        entry.getKey(), 
+        context.<ParameterValue>deserialize(
+          entry.getValue(), 
+          ParameterValue.class));
+    return builder.get();
+  }
+
+}
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/ParametersValue.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/ParametersValue.java
@ -22,13 +22,13 @@
 package com.ibm.common.activitystreams.actions;

 import java.io.Serializable;
+import java.util.Iterator;
 import java.util.Map;

+import com.google.common.base.Supplier;
 import com.google.common.collect.ImmutableMap;
-import com.ibm.common.activitystreams.ASObject;
-import com.ibm.common.activitystreams.TypeValue;
-import com.ibm.common.activitystreams.ValueType;
-import com.ibm.common.activitystreams.util.AbstractDictionaryObject;
+import com.google.common.collect.Maps;
+import com.ibm.common.activitystreams.util.AbstractWritable;

 /**
 * The value of the "parameters" property... 
@ -36,115 +36,81 @@ import com.ibm.common.activitystreams.util.AbstractDictionaryObject;
 * @version $Revision: 1.0 $
 */
 public final class ParametersValue
-  extends AbstractDictionaryObject<TypeValue>
-  implements Serializable {
+  extends AbstractWritable
+  implements Serializable, Iterable<String> {

-  /**
-   * Method make.
-  
-   * @return Builder */
  public static Builder make() {
    return new Builder();
  }
-  
 
  /**
   * @author james
   * @version $Revision: 1.0 $
   */
  public static final class Builder 
-    extends AbstractDictionaryObject.AbstractBuilder
-      <TypeValue,ParametersValue,Builder> {
+    extends AbstractWritable.AbstractWritableBuilder
+      <ParametersValue,Builder> {

-    /**
-     * Method set.
-     * @param param String
-     * @param iri String
+    private final Map<String,Object> params = 
+      Maps.newHashMap();
    
-     * @return Builder */
-    public Builder set(String param, String iri) {
-      return super.set(
-        param, 
-        TypeValue.SimpleTypeValue.make(iri));
+    public Builder() {
+      writeUsing(ActionMakers.io);
    }
    
-    /**
-     * Method get.
+    public boolean notEmpty() {
+      return !params.isEmpty();
+    }
    
+    public Builder param(String param, String iri) {
+      params.put(param, ActionMakers.parameter(iri));
+      return this;
+    }
+    
+    public Builder param(
+      String param, 
+      ParameterValue parameter) {
+      params.put(param, parameter);
+      return this;
+    }
+    
+    public Builder param(
+      String param, 
+      Supplier<? extends ParameterValue> parameter) {
+      params.put(param, parameter);
+      return this;
+    }
    
-     * @return ParametersValue * @see com.google.common.base.Supplier#get() */
    public ParametersValue get() {
      return new ParametersValue(this);
    }
    
  }
  
+  private final ImmutableMap<String,Object> params;
+  
  /**
   * Constructor for ParametersValue.
   * @param builder Builder
   */
  ParametersValue(Builder builder) {
    super(builder);
+    this.params = ImmutableMap.copyOf(builder.params);
  }
  
-  /**
-   * Method get.
-   * @param param String
-  
-   * @return TypeValue */
+  public Iterator<String> iterator() {
+    return params.keySet().iterator();
+  }
+
  @SuppressWarnings("unchecked")
-  public <T extends TypeValue>T get(String param) {
-    return (T)super.getSingle(param);
+  public <O extends ParameterValue>O get(String param) {
+    return (O)params.get(param);
  }
  
-  /**
-   * Method id.
-   * @param param String
-   * @return String
-   */
-  public String id(String param) {
-    TypeValue tv = get(param);
-    return tv != null ? tv.id() : null;
+  public boolean has(String param) {
+    return params.containsKey(param);
  }
  
-  /**
-   * Method required.
-   * @param param String
-   * @return boolean
-   */
-  public boolean required(String param) {
-    TypeValue tv = get(param);
-    if (tv == null) 
-      return false;
-    if (tv.valueType() == ValueType.SIMPLE)
-      return true;
-    ASObject obj = (ASObject) tv;
-    return obj.getBoolean("required", true);
-  }
-  
-  /**
-   * Method value.
-   * @param param String
-   * @param defaultValue O
-   * @return O
-   */
-  public <O>O value(String param, O defaultValue) {
-    TypeValue tv = get(param);
-    if (tv == null || tv.valueType() == ValueType.SIMPLE)
-      return defaultValue;
-    ASObject obj = (ASObject) tv;
-    return obj.<O>get("value", defaultValue);
-  }
-  
-  /**
-   * Method value.
-   * @param param String
-   * @return O
-   */
-  public <O>O value(String param) {
-    return value(param,null);
-  }
- 
  Object writeReplace() throws java.io.ObjectStreamException {
    return new SerializedForm(this);
  }
@ -154,19 +120,14 @@ public final class ParametersValue
    private static final long serialVersionUID = -1975376657749952999L;
    private ImmutableMap<String,Object> map;
    SerializedForm(ParametersValue obj) {
-      ImmutableMap.Builder<String,Object> builder = 
-        ImmutableMap.builder();
-      for (String key : obj)
-        builder.put(key, obj.get(key));
-      this.map = builder.build();
+      map = obj.params;
    }

    Object readResolve() 
      throws java.io.ObjectStreamException {
        ParametersValue.Builder builder = 
          ParametersValue.make();
-        for (Map.Entry<String,Object> entry : map.entrySet())
-          builder.set(entry.getKey(), (TypeValue) entry.getValue());
+        builder.params.putAll(map);
        return builder.get();
    }
  }
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/StylesValue.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/StylesValue.java
@ -56,6 +56,10 @@ public final class StylesValue
    extends AbstractDictionaryObject.AbstractBuilder
      <String, StylesValue, Builder> {

+    public Builder() {
+      writeUsing(ActionMakers.io);
+    }
+    
    /**
     * Method media.
     * @param query String
--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/TypedPayload.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/TypedPayload.java
@ -30,10 +30,9 @@ import com.ibm.common.activitystreams.ASObject;
 import com.ibm.common.activitystreams.LinkValue;
 import com.ibm.common.activitystreams.TypeValue;

-/**
- */
 public final class TypedPayload 
-  extends ASObject {
+  extends ASObject
+  implements ParameterValue {

  /**
   * Method makeTypedPayload.
@ -62,7 +61,8 @@ public final class TypedPayload
  public static final class Builder 
    extends ASObject.AbstractBuilder<TypedPayload, Builder> {

-    private Builder() {
+    public Builder() {
+      writeUsing(ActionMakers.io);
      objectType("TypedPayload");
    }

--- a/actions/src/main/java/com/ibm/common/activitystreams/actions/UrlTemplate.java
+++ b/actions/src/main/java/com/ibm/common/activitystreams/actions/UrlTemplate.java
@ -21,19 +21,16 @@
 */
 package com.ibm.common.activitystreams.actions;

-import static com.ibm.common.activitystreams.Makers.type;
-import static com.ibm.common.activitystreams.Makers.object;
-
 import java.io.ObjectStreamException;

 import com.google.common.base.Supplier;
 import com.ibm.common.activitystreams.ASObject;
-import com.ibm.common.activitystreams.TypeValue;

 /**
 */
 public final class UrlTemplate 
-  extends ASObject {
+  extends ASObject
+  implements ParameterValue {

  /**
   * Method makeUrlTemplate.
@ -51,95 +48,34 @@ public final class UrlTemplate
    private final ParametersValue.Builder params = 
      ParametersValue.make();
    
-    private Builder() {
+    public Builder() {
+      writeUsing(ActionMakers.io);
      objectType("UrlTemplate");
    }
    
-    /**
-     * Method template.
-     * @param template String
-     * @return Builder
-     */
    public Builder template(String template) {
      set("template", template);
      return this;
    }

-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @return Builder
-     */
    public Builder parameter(String name, String iri) {
-      params.set(name, type(iri));
+      params.param(name, iri);
      return this;
    }
    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @param required boolean
-     * @return Builder
-     */
    public Builder parameter(
      String name, 
-      String iri, 
-      boolean required) {
-      return parameter(
-        name, 
-        object()
-          .id(iri)
-          .set("required", required));
+      ParameterValue parameter) {
+        params.param(name, parameter);
+        return this;
    }
    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param iri String
-     * @param required boolean
-     * @param value Object
-     * @return Builder
-     */
    public Builder parameter(
      String name, 
-      String iri, 
-      boolean required, 
-      Object value) {
-      return parameter(
-        name,
-        object()
-          .id(iri)
-          .set("required", required)
-          .set("value", value));
+      Supplier<? extends ParameterValue> parameter) {
+        return parameter(name, parameter.get());
    }
-    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param lv TypeValue
-     * @return Builder
-     */
-    public Builder parameter(
-      String name, 
-      TypeValue lv) {
-      params.set(name, lv);
-      return this;
-    }
-    
-    /**
-     * Method parameter.
-     * @param name String
-     * @param lv Supplier<? extends TypeValue>
-     * @return Builder
-     */
-    public Builder parameter(
-      String name, 
-      Supplier<? extends TypeValue> lv) {
-      return parameter(name, lv.get());
-    }
-    
+        
    /**
     * Method get.
     * @return UrlTemplate
--- a/actions/src/test/java/com/ibm/common/activitystreams/actions/test/ActionsTest.java
+++ b/actions/src/test/java/com/ibm/common/activitystreams/actions/test/ActionsTest.java
@ -0,0 +1,159 @@
+package com.ibm.common.activitystreams.actions.test;
+
+import static com.ibm.common.activitystreams.actions.ActionMakers.htmlForm;
+import static com.ibm.common.activitystreams.actions.ActionMakers.io;
+import static com.ibm.common.activitystreams.actions.ActionMakers.parameter;
+import static com.ibm.common.activitystreams.actions.ActionMakers.typedPayload;
+import static com.ibm.common.activitystreams.actions.ActionMakers.urlTemplate;
+import static com.ibm.common.activitystreams.actions.ActionMakers.embedAction;
+import static com.ibm.common.activitystreams.actions.ActionMakers.intentAction;
+import static com.ibm.common.activitystreams.actions.ActionMakers.httpAction;
+import static com.ibm.common.activitystreams.actions.ActionMakers.styles;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+
+import org.junit.Test;
+
+import static com.google.common.collect.Iterables.*;
+
+import com.google.common.net.MediaType;
+import com.ibm.common.activitystreams.ASObject;
+import com.ibm.common.activitystreams.LinkValue;
+import com.ibm.common.activitystreams.LinkValue.SimpleLinkValue;
+import com.ibm.common.activitystreams.actions.EmbedActionHandler;
+import com.ibm.common.activitystreams.actions.HtmlForm;
+import com.ibm.common.activitystreams.actions.HttpActionHandler;
+import com.ibm.common.activitystreams.actions.IntentActionHandler;
+import com.ibm.common.activitystreams.actions.Parameter;
+import com.ibm.common.activitystreams.actions.ParametersValue;
+import com.ibm.common.activitystreams.actions.StylesValue;
+import com.ibm.common.activitystreams.actions.TypedPayload;
+import com.ibm.common.activitystreams.actions.UrlTemplate;
+
+public final class ActionsTest {
+
+  @Test
+  public void roundtripHttpActionHandler() {
+    
+    HttpActionHandler hah1 =
+      httpAction()
+        .url("http://example.org")
+        .method("GET")
+        .get();
+    
+    HttpActionHandler hah2 = 
+      roundTrip(hah1);
+    
+    assertEquals("GET", hah2.method());
+    
+    Iterable<LinkValue> i = hah2.url();
+    LinkValue lv = getFirst(i,null);
+    assertNotNull(lv);
+    assertTrue(lv instanceof SimpleLinkValue);
+    SimpleLinkValue slv = (SimpleLinkValue) lv;
+    assertEquals("http://example.org", slv.url());
+    
+  }
+  
+  @Test
+  public void roundtripIntentActionHandler() {
+    
+    IntentActionHandler iah1 =
+      intentAction()
+        .id("urn:example:foo:1")
+        .get();
+    
+    IntentActionHandler iah2 =
+      roundTrip(iah1);
+    
+    assertEquals("urn:example:foo:1", iah2.id());
+    
+  }
+  
+  @Test
+  public void roundtripEmbedActionHandler() {
+    
+    EmbedActionHandler eah1 = 
+      embedAction()
+        .style(
+          styles()
+            .set("width", "100px")
+        )
+        .get();
+    
+    EmbedActionHandler eah2 =
+      roundTrip(eah1);
+    
+    Iterable<StylesValue> styles = 
+      eah2.styles();
+    StylesValue style = 
+      getFirst(styles, null);
+    assertNotNull(style);
+    assertTrue(style.has("width"));
+    assertEquals("100px", style.get("width"));
+  }
+  
+  @Test
+  public void roundtripHtmlForm() {
+    HtmlForm htmlForm1 = 
+      htmlForm()
+        .parameter("foo", parameter().optional())
+        .get();
+    
+    HtmlForm htmlForm2 =
+      roundTrip(htmlForm1);
+    
+    ParametersValue params = 
+      htmlForm2.parameters();
+    assertTrue(params.has("foo"));
+    
+    Parameter param = params.get("foo");
+    assertFalse(param.required());
+  }
+  
+  @Test
+  public void roundtripTypedValue() {
+    TypedPayload typedPayload1 =
+      typedPayload()
+        .mediaType(MediaType.create("application", "json"))
+        .get();
+    
+    TypedPayload typedPayload2 = 
+      roundTrip(typedPayload1);
+    
+    assertEquals(
+      typedPayload1.mediaType(),
+      typedPayload2.mediaType());
+  }
+  
+  @Test
+  public void roundtripUrlTemplate() {
+    UrlTemplate template1 = 
+      urlTemplate()
+        .template("http://example.org{/foo}")
+        .parameter("foo", "bar")
+        .get();
+    UrlTemplate template2 = 
+      roundTrip(template1);
+    assertEquals(
+      template1.template(), 
+      template2.template());
+    ParametersValue value = 
+      template2.parameters();
+    assertTrue(value.has("foo"));   
+  }
+  
+  private <T extends ASObject>T roundTrip(T writable) {
+    ByteArrayOutputStream out = 
+      new ByteArrayOutputStream();
+    writable.writeTo(out,io);
+    ByteArrayInputStream in =
+      new ByteArrayInputStream(out.toByteArray());
+    return io.readAs(in);
+  }
+}
--- a/core/src/main/java/com/ibm/common/activitystreams/ASObject.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/ASObject.java
@ -23,7 +23,6 @@ package com.ibm.common.activitystreams;

 import static com.google.common.base.Enums.getIfPresent;
 import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Throwables.propagate;
 import static com.google.common.collect.ImmutableList.of;
 import static com.google.common.collect.Iterables.filter;
@ -45,6 +44,7 @@ import static com.ibm.common.activitystreams.util.Converters.toInterval;
 import static com.ibm.common.activitystreams.util.Converters.toLong;
 import static com.ibm.common.activitystreams.util.Converters.toPeriod;
 import static com.ibm.common.activitystreams.util.Converters.toShort;
+import static com.ibm.common.activitystreams.util.Util.DEFAULT_LOCALE;
 import static java.lang.Math.ceil;
 import static java.lang.Math.floor;
 import static org.joda.time.DateTimeZone.UTC;
@ -53,7 +53,6 @@ import static org.joda.time.Duration.standardSeconds;
 import java.io.ObjectStreamException;
 import java.io.Serializable;
 import java.util.Iterator;
-import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
@ -144,19 +143,7 @@ public class ASObject
    checkArgument(l >= 0);
    return l;
  }
-  
-  /**
-   * Method convLocale.
-   * @param locale Locale
-   * @return String 
-   **/
-  private static String convLocale(Locale locale) {
-    return checkNotNull(locale).toString().replaceAll("_", "-");
-  }
-  
-  private static final String DEFAULT_LOCALE = 
-    convLocale(Locale.getDefault());
-  
+    
  /**
   * Abstract base builder for ASObject instances.
   */
--- a/core/src/main/java/com/ibm/common/activitystreams/Writable.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/Writable.java
@ -94,4 +94,5 @@ public interface Writable {
   * @return Future&lt;?>
   */
  Future<?> writeTo(Writer out, IO io, ExecutorService executor);
+  
 }
--- a/core/src/main/java/com/ibm/common/activitystreams/internal/GsonWrapper.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/internal/GsonWrapper.java
@ -237,7 +237,29 @@ public final class GsonWrapper {
    GsonBuilder gson = new GsonBuilder()
    .registerTypeHierarchyAdapter(TypeValue.class, new TypeValueAdapter(schema))
    .registerTypeHierarchyAdapter(LinkValue.class, new LinkValueAdapter(schema))
-    .registerTypeHierarchyAdapter(Iterable.class, ITERABLE);
+    .registerTypeHierarchyAdapter(Iterable.class, ITERABLE)
+    .registerTypeHierarchyAdapter(ASObject.class, base)
+    .registerTypeHierarchyAdapter(Collection.class, base)
+    .registerTypeHierarchyAdapter(Activity.class, base)
+    .registerTypeHierarchyAdapter(NLV.class, NLV)
+    .registerTypeHierarchyAdapter(ActionsValue.class, ACTIONS)
+    .registerTypeHierarchyAdapter(Optional.class, OPTIONAL)
+    .registerTypeHierarchyAdapter(Range.class, RANGE)
+    .registerTypeHierarchyAdapter(Table.class, TABLE)
+    .registerTypeHierarchyAdapter(LazilyParsedNumber.class, NUMBER)
+    .registerTypeHierarchyAdapter(LazilyParsedNumberComparable.class, NUMBER)
+    .registerTypeHierarchyAdapter(ReadableDuration.class, DURATION)
+    .registerTypeHierarchyAdapter(ReadablePeriod.class, PERIOD)
+    .registerTypeHierarchyAdapter(ReadableInterval.class, INTERVAL)
+    .registerTypeAdapter(
+      Activity.Status.class, 
+      forEnum(
+        Activity.Status.class, 
+        Activity.Status.OTHER))
+    .registerTypeAdapter(Date.class, DATE)
+    .registerTypeAdapter(DateTime.class, DATETIME)
+    .registerTypeAdapter(MediaType.class, MIMETYPE)
+    .registerTypeHierarchyAdapter(Multimap.class, MULTIMAP);
    
    for (AdapterEntry<?> entry : adapters) {
      if (entry.hier)
@ -252,30 +274,8 @@ public final class GsonWrapper {
            entry.adapter:base);
    }
    
-    return gson
-      .registerTypeHierarchyAdapter(NLV.class, NLV)
-      .registerTypeHierarchyAdapter(ActionsValue.class, ACTIONS)
-      .registerTypeHierarchyAdapter(Optional.class, OPTIONAL)
-      .registerTypeHierarchyAdapter(Range.class, RANGE)
-      .registerTypeHierarchyAdapter(Table.class, TABLE)
-      .registerTypeHierarchyAdapter(LazilyParsedNumber.class, NUMBER)
-      .registerTypeHierarchyAdapter(LazilyParsedNumberComparable.class, NUMBER)
-      .registerTypeHierarchyAdapter(ASObject.class, base)
-      .registerTypeHierarchyAdapter(Collection.class, base)
-      .registerTypeHierarchyAdapter(Activity.class, base)
-      .registerTypeHierarchyAdapter(ReadableDuration.class, DURATION)
-      .registerTypeHierarchyAdapter(ReadablePeriod.class, PERIOD)
-      .registerTypeHierarchyAdapter(ReadableInterval.class, INTERVAL)
-      .registerTypeAdapter(
-        Activity.Status.class, 
-        forEnum(
-          Activity.Status.class, 
-          Activity.Status.OTHER))
-      .registerTypeAdapter(Date.class, DATE)
-      .registerTypeAdapter(DateTime.class, DATETIME)
-      .registerTypeAdapter(MediaType.class, MIMETYPE)
-      .registerTypeHierarchyAdapter(Multimap.class, MULTIMAP)
-    ;
+    return gson;
+
  }
  
  /**
--- a/core/src/main/java/com/ibm/common/activitystreams/util/Util.java
+++ b/core/src/main/java/com/ibm/common/activitystreams/util/Util.java
@ -0,0 +1,23 @@
+package com.ibm.common.activitystreams.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Locale;
+
+public final class Util {
+
+  private Util() {}
+  
+  /**
+   * Method convLocale.
+   * @param locale Locale
+   * @return String 
+   **/
+  public static String convLocale(Locale locale) {
+    return checkNotNull(locale).toString().replaceAll("_", "-");
+  }
+  
+  public static final String DEFAULT_LOCALE = 
+    convLocale(Locale.getDefault());
+  
+}