simplified instansiating object methods in 'as'-methods

src/main/java/com/nerdforge/unxml/parsers/ArrayParser.java

@@ -44,8 +44,8 @@ public ArrayNode apply(Node node) {
      * Returns the parsed result as a List of Objects of class A
      * @return Result as a List of Objects
      */
-    public <A> Function<Node, List<A>> as(Class<A> valueType) {
-        return this.andThen(jsonUtil.asList(valueType));
+    public <A> ListParser<A> as(Class<A> valueType){
+        return this.<List<A>>andThen(jsonUtil.asList(valueType))::apply;
     }
 
     private Collector<JsonNode, ArrayNode, ArrayNode> toArrayNode(){

src/main/java/com/nerdforge/unxml/parsers/InstanceParser.java

@@ -0,0 +1,6 @@
+package com.nerdforge.unxml.parsers;
+
+import org.w3c.dom.Node;
+import java.util.function.Function;
+
+public interface InstanceParser<A> extends Function<Node, A>{}

src/main/java/com/nerdforge/unxml/parsers/ListParser.java

@@ -1,8 +1,5 @@
 package com.nerdforge.unxml.parsers;
 
-import org.w3c.dom.Node;
-
 import java.util.List;
-import java.util.function.Function;
 
-public interface ListParser<A> extends Function<Node, List<A>> {}
+public interface ListParser<V> extends InstanceParser<List<V>> {}

src/main/java/com/nerdforge/unxml/parsers/builders/ObjectParserBuilder.java

@@ -1,10 +1,12 @@
 package com.nerdforge.unxml.parsers.builders;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.Maps;
 import com.google.inject.Inject;
 import com.nerdforge.unxml.factory.ObjectParserFactory;
 import com.nerdforge.unxml.json.JsonUtil;
+import com.nerdforge.unxml.parsers.InstanceParser;
 import com.nerdforge.unxml.parsers.Parser;
 import com.nerdforge.unxml.parsers.ObjectParser;
 import com.nerdforge.unxml.parsers.SimpleParsers;
@@ -96,8 +98,8 @@ public ObjectParser build(){
      * Returns some Json utility methods
      * @return An instance of JsonUtil
      */
-    public <A> Function<Node, A> as(Class<A> valueType){
-        return build().andThen(jsonUtil.as(valueType));
+    public <A> InstanceParser<A> as(Class<A> valueType) {
+        return build().<A>andThen(jsonUtil.as(valueType))::apply;
     }
 
     private Map<String, Parser<?>> wrapAttributes(String path){

src/test/java/com/nerdforge/unxml/parsers/ArrayParserTest.java

@@ -68,7 +68,8 @@ public void testParseArrayWithObjects() {
         assertThat(node.at("/0/title").asText()).isEqualTo("mytitle");
 
         // Make an object
-        List<Article> articles = parser.as(Article.class).apply(input);
+        ListParser<Article> articleListParser = parser.as(Article.class);
+        List<Article> articles = articleListParser.apply(input);
 
         assertThat(articles).hasSize(2);
         assertThat(articles.get(0).id).isEqualTo(1);

src/test/java/com/nerdforge/unxml/parsers/SimpleParsersTest.java

@@ -6,6 +6,9 @@
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.w3c.dom.Document;
+
+import java.util.function.Function;
+
 import static org.fest.assertions.Assertions.*;
 
 public class SimpleParsersTest {