Refactored toYaml / fromYaml into separate classes to better separate concerns and improve testability for a future custom implementation

Author: JanHolger

src/main/java/org/javawebstack/abstractdata/AbstractElement.java

@@ -7,6 +7,8 @@
 import org.javawebstack.abstractdata.json.JsonDumper;
 import org.javawebstack.abstractdata.json.JsonParser;
 import org.javawebstack.abstractdata.util.QueryString;
+import org.javawebstack.abstractdata.yaml.YamlDumper;
+import org.javawebstack.abstractdata.yaml.YamlParser;
 import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.Yaml;
 
@@ -110,41 +112,27 @@ default String toJsonString() {
     Object toObject();
 
     default String toYaml(boolean pretty) {
-        Yaml yaml;
-        if (pretty) {
-            DumperOptions options = new DumperOptions();
-            options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
-            options.setPrettyFlow(true);
-            yaml = new Yaml(options);
-        } else {
-            yaml = new Yaml();
-        }
-        return yaml.dump(toObject());
+        return new YamlDumper().setPretty(pretty).dump(this);
     }
 
     default String toYaml() {
         return toYaml(true);
     }
 
     static AbstractElement fromYaml(String source, boolean singleRoot) {
-        Yaml yaml = new Yaml();
-        Object object = yaml.load(source);
-        if (singleRoot && object instanceof List) {
-            List<Object> list = (List<Object>) object;
-            if (list.size() == 0) {
-                object = new HashMap<>();
-            } else {
-                object = list.get(0);
-            }
-        }
-        return fromAbstractObject(object);
+        return new YamlParser().setSingleRoot(singleRoot).parse(source);
     }
 
     static AbstractElement fromYaml(String source) {
         return fromYaml(source, false);
     }
 
+    @Deprecated
     static AbstractElement fromAbstractObject(Object object) {
+        return fromObject(object);
+    }
+
+    static AbstractElement fromObject(Object object) {
         if (object == null)
             return AbstractNull.VALUE;
         if (object instanceof List) {

src/main/java/org/javawebstack/abstractdata/yaml/LegacyYamlDumper.java

@@ -0,0 +1,22 @@
+package org.javawebstack.abstractdata.yaml;
+
+import org.javawebstack.abstractdata.AbstractElement;
+import org.yaml.snakeyaml.DumperOptions;
+import org.yaml.snakeyaml.Yaml;
+
+public class LegacyYamlDumper {
+
+    protected static String dump(AbstractElement e, boolean pretty) {
+        Yaml yaml;
+        if (pretty) {
+            DumperOptions options = new DumperOptions();
+            options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
+            options.setPrettyFlow(true);
+            yaml = new Yaml(options);
+        } else {
+            yaml = new Yaml();
+        }
+        return yaml.dump(e.toObject());
+    }
+
+}

src/main/java/org/javawebstack/abstractdata/yaml/LegacyYamlParser.java

@@ -0,0 +1,25 @@
+package org.javawebstack.abstractdata.yaml;
+
+import org.javawebstack.abstractdata.AbstractElement;
+import org.yaml.snakeyaml.Yaml;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class LegacyYamlParser {
+
+    protected static AbstractElement parse(String source, boolean singleRoot) {
+        Yaml yaml = new Yaml();
+        Object object = yaml.load(source);
+        if (singleRoot && object instanceof List) {
+            List<Object> list = (List<Object>) object;
+            if (list.size() == 0) {
+                object = new HashMap<>();
+            } else {
+                object = list.get(0);
+            }
+        }
+        return AbstractElement.fromObject(object);
+    }
+
+}

src/main/java/org/javawebstack/abstractdata/yaml/YamlDumper.java

@@ -0,0 +1,22 @@
+package org.javawebstack.abstractdata.yaml;
+
+import org.javawebstack.abstractdata.AbstractElement;
+
+public class YamlDumper {
+
+    private boolean pretty = false;
+
+    public YamlDumper setPretty(boolean pretty) {
+        this.pretty = pretty;
+        return this;
+    }
+
+    public boolean isPretty() {
+        return pretty;
+    }
+
+    public String dump(AbstractElement e) {
+        return LegacyYamlDumper.dump(e, pretty);
+    }
+
+}

src/main/java/org/javawebstack/abstractdata/yaml/YamlParser.java

@@ -0,0 +1,22 @@
+package org.javawebstack.abstractdata.yaml;
+
+import org.javawebstack.abstractdata.AbstractElement;
+
+public class YamlParser {
+
+    boolean singleRoot = false;
+
+    public YamlParser setSingleRoot(boolean singleRoot) {
+        this.singleRoot = singleRoot;
+        return this;
+    }
+
+    public boolean isSingleRoot() {
+        return singleRoot;
+    }
+
+    public AbstractElement parse(String source) {
+        return LegacyYamlParser.parse(source, singleRoot);
+    }
+
+}