#355 override toString to log properties

abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java

@@ -8,31 +8,42 @@ import java.util.stream.Stream;
 
 public abstract class AbstractDocument implements Document {
 
-	private final Map<String, Object> properties;
+    private final Map<String, Object> properties;
 
-	protected AbstractDocument(Map<String, Object> properties) {
-		Objects.requireNonNull(properties, "properties map is required");
-		this.properties = properties;
-	}
+    protected AbstractDocument(Map<String, Object> properties) {
+        Objects.requireNonNull(properties, "properties map is required");
+        this.properties = properties;
+    }
 
-	@Override
-	public Void put(String key, Object value) {
-		properties.put(key, value);
-		return null;
-	}
+    @Override
+    public Void put(String key, Object value) {
+        properties.put(key, value);
+        return null;
+    }
 
-	@Override
-	public Object get(String key) {
-		return properties.get(key);
-	}
+    @Override
+    public Object get(String key) {
+        return properties.get(key);
+    }
 
-	@Override
-	public <T> Stream<T> children(String key, Function<Map<String, Object>, T> constructor) {
-		return Stream.of(get(key))
-				.filter(el -> el != null)
-				.map(el -> (List<Map<String, Object>>) el)
-				.findFirst().get().stream()
-				.map(constructor);
-	}
+    @Override
+    public <T> Stream<T> children(String key, Function<Map<String, Object>, T> constructor) {
+        return Stream.of(get(key))
+                .filter(el -> el != null)
+                .map(el -> (List<Map<String, Object>>) el)
+                .findAny().get().stream()
+                .map(constructor);
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append(getClass().getName()).append("[");
+        properties.entrySet().forEach(e ->
+                builder.append("[").append(e.getKey()).append(" : ").append(e.getValue()).append("]")
+        );
+        builder.append("]");
+        return builder.toString();
+    }
 
 }