feat: asset manager

app/src/main/java/chess/view/AssetManager.java

@@ -0,0 +1,38 @@
+package chess.view;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class AssetManager {
+
+	private static final String gradleBase = "app/src/main/resources/";
+
+	public static InputStream getResource(String name) {
+		// we first search it in files
+		InputStream inputStream = getFileInputStream(name);
+		if (inputStream != null)
+			return inputStream;
+
+		inputStream = getFileInputStream(gradleBase + name);
+		if (inputStream != null)
+			return inputStream;
+		// then in the jar
+		return ClassLoader.getSystemResourceAsStream(name);
+	}
+
+	private static InputStream getFileInputStream(String path) {
+		File f = new File(path);
+		if (f.exists()) {
+			FileInputStream fis;
+			try {
+				fis = new FileInputStream(f);
+				return fis;
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+		return null;
+	}
+}