Merge pull request #26 from litetex/shorthand-jsonarray-to-jsonobject-stream-method

Added ``JsonArray#streamAs`` shortcut methods

Author: TobiGr

README.md

@@ -3,4 +3,5 @@
 This is a fork of [nanojson](https://github.com/mmastrac/nanojson) for use by NewPipe(Extractor). It has the following changes:
 
 - It returns an empty `JsonObject` or `JsonArray` by default instead of `null`, preventing `NullPointerException`s.
-- It accepts JS-like JSON, such as `{ this: 'is', an: 'example' }`.
+- It accepts JS-like JSON, such as `{ this: 'is', an: 'example' }`.
+- Added ``JsonArray#streamAs`` and ``JsonArray#streamAsJsonObjects`` shortcut methods.

src/main/java/com/grack/nanojson/JsonArray.java

@@ -18,6 +18,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.stream.Stream;
 
 /**
  * Extends an {@link ArrayList} with helper methods to determine the underlying JSON type of the list element.
@@ -253,4 +254,20 @@ public boolean isNumber(int key) {
 	public boolean isString(int key) {
 		return get(key) instanceof String;
 	}
+
+	/**
+	 * Shortcut method to create a stream with only objects of these classes.
+	 */
+	public <T> Stream<T> streamAs(Class<T> clazz) {
+		return stream()
+			.filter(clazz::isInstance)
+			.map(clazz::cast);
+	}
+
+	/**
+	 *  Shortcut method to create a stream that only contains {@link JsonObject JsonObjects}.
+	 */
+	public Stream<JsonObject> streamAsJsonObjects() {
+		return streamAs(JsonObject.class);
+	}
 }