[json-node] Add JsonNode.toPlain() method to return as plain java types

json-node/src/main/java/io/avaje/json/node/JsonArray.java

@@ -78,6 +78,15 @@ public JsonArray copy() {
     return new JsonArray(newList);
   }
 
+  @Override
+  public List<Object> toPlain() {
+    final var newList = new ArrayList<>(children.size());
+    for (JsonNode child : children) {
+      newList.add(child.toPlain());
+    }
+    return newList;
+  }
+
   @Override
   public Type type() {
     return Type.ARRAY;

json-node/src/main/java/io/avaje/json/node/JsonBoolean.java

@@ -42,6 +42,11 @@ public JsonBoolean copy() {
     return this;
   }
 
+  @Override
+  public Boolean toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.BOOLEAN;

json-node/src/main/java/io/avaje/json/node/JsonDecimal.java

@@ -45,6 +45,11 @@ public JsonDecimal copy() {
     return this;
   }
 
+  @Override
+  public BigDecimal toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.NUMBER;

json-node/src/main/java/io/avaje/json/node/JsonDouble.java

@@ -45,6 +45,11 @@ public JsonDouble copy() {
     return this;
   }
 
+  @Override
+  public Double toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.NUMBER;

json-node/src/main/java/io/avaje/json/node/JsonInteger.java

@@ -45,6 +45,11 @@ public JsonInteger copy() {
     return this;
   }
 
+  @Override
+  public Integer toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.NUMBER;

json-node/src/main/java/io/avaje/json/node/JsonLong.java

@@ -45,6 +45,11 @@ public JsonLong copy() {
     return this;
   }
 
+  @Override
+  public Long toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.NUMBER;

json-node/src/main/java/io/avaje/json/node/JsonNode.java

@@ -80,6 +80,11 @@ public boolean isObject() {
    */
   JsonNode copy();
 
+  /**
+   * Return the JsonNode as its plain Java value ({@code String, Integer, List, Map etc}).
+   */
+  Object toPlain();
+
   /**
    * Find a node given a path using dot notation.
    *

json-node/src/main/java/io/avaje/json/node/JsonObject.java

@@ -91,6 +91,15 @@ public JsonObject copy() {
     return new JsonObject(mapCopy);
   }
 
+  @Override
+  public Map<String, Object> toPlain() {
+    final var mapCopy = new LinkedHashMap<String, Object>();
+    for (Map.Entry<String, JsonNode> entry : children.entrySet()) {
+      mapCopy.put(entry.getKey(), entry.getValue().toPlain());
+    }
+    return mapCopy;
+  }
+
   /**
    * Return true if the json object contains no elements.
    */

json-node/src/main/java/io/avaje/json/node/JsonString.java

@@ -42,6 +42,11 @@ public JsonString copy() {
     return this;
   }
 
+  @Override
+  public String toPlain() {
+    return value;
+  }
+
   @Override
   public Type type() {
     return Type.STRING;

json-node/src/test/java/io/avaje/json/node/JsonArrayTest.java

@@ -3,6 +3,7 @@
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -132,4 +133,16 @@ void unmodifiable() {
             .isInstanceOf(UnsupportedOperationException.class);
   }
 
+  @Test
+  void toPlain() {
+    final JsonArray source = JsonArray.create()
+      .add("foo")
+      .add(JsonObject.create().add("b", 42));
+
+    List<Object> plain = source.toPlain();
+    assertThat(plain).hasSize(2);
+    assertThat(plain.get(0)).isEqualTo("foo");
+    assertThat(plain.get(1)).isEqualTo(Map.of("b", 42));
+  }
+
 }

json-node/src/test/java/io/avaje/json/node/JsonBooleanTest.java

@@ -28,6 +28,12 @@ void copy() {
     assertThat(jsonBoolean.copy()).isSameAs(jsonBoolean);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonBoolean.toPlain()).isTrue();
+    assertThat(JsonBoolean.of(false).toPlain()).isFalse();
+  }
+
   @Test
   void unmodifiable() {
     assertThat(jsonBoolean.unmodifiable()).isSameAs(jsonBoolean);

json-node/src/test/java/io/avaje/json/node/JsonDecimalTest.java

@@ -33,6 +33,11 @@ void unmodifiable() {
     assertThat(jsonDecimal.unmodifiable()).isSameAs(jsonDecimal);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonDecimal.toPlain()).isEqualTo(new BigDecimal("42.3"));
+  }
+
   @Test
   void value() {
     assertThat(jsonDecimal.doubleValue()).isEqualTo(42.3D);

json-node/src/test/java/io/avaje/json/node/JsonDoubleTest.java

@@ -33,6 +33,11 @@ void unmodifiable() {
     assertThat(jsonDouble.unmodifiable()).isSameAs(jsonDouble);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonDouble.toPlain()).isEqualTo(42.3D);
+  }
+
   @Test
   void value() {
     assertThat(jsonDouble.intValue()).isEqualTo(42);

json-node/src/test/java/io/avaje/json/node/JsonIntegerTest.java

@@ -33,6 +33,11 @@ void unmodifiable() {
     assertThat(jsonInteger.unmodifiable()).isSameAs(jsonInteger);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonInteger.toPlain()).isEqualTo(42);
+  }
+
   @Test
   void value() {
     assertThat(jsonInteger.intValue()).isEqualTo(42);

json-node/src/test/java/io/avaje/json/node/JsonLongTest.java

@@ -33,6 +33,11 @@ void unmodifiable() {
     assertThat(jsonLong.unmodifiable()).isSameAs(jsonLong);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonLong.toPlain()).isEqualTo(42L);
+  }
+
   @Test
   void value() {
     assertThat(jsonLong.intValue()).isEqualTo(42);

json-node/src/test/java/io/avaje/json/node/JsonObjectTest.java

@@ -164,4 +164,16 @@ void unmodifiable() {
     assertThatThrownBy(() -> copy.add("canMutate", true))
       .isInstanceOf(UnsupportedOperationException.class);
   }
+
+  @Test
+  void toPlain() {
+    final var source = JsonObject.create()
+      .add("name", "foo")
+      .add("other", JsonObject.create().add("b", 42));
+
+    Map<String, Object> plainMap = source.toPlain();
+    assertThat(plainMap).containsOnlyKeys("name", "other");
+    assertThat(plainMap.get("name")).isEqualTo("foo");
+    assertThat(plainMap.get("other")).isEqualTo(Map.of("b", 42));
+  }
 }

json-node/src/test/java/io/avaje/json/node/JsonStringTest.java

@@ -32,6 +32,11 @@ void unmodifiable() {
     assertThat(jsonString.unmodifiable()).isSameAs(jsonString);
   }
 
+  @Test
+  void toPlain() {
+    assertThat(jsonString.toPlain()).isEqualTo("foo");
+  }
+
   @Test
   void value() {
     assertThat(jsonString.value()).isEqualTo("foo");