added JPMS URL stream handler

src/main/java/net/woggioni/jwo/UncloseableOutputStream.java

@@ -1,6 +1,7 @@
 package net.woggioni.jwo;
 
 import java.io.FilterOutputStream;
+import java.io.IOException;
 import java.io.OutputStream;
 
 /**
@@ -14,6 +15,7 @@ public class UncloseableOutputStream extends FilterOutputStream {
     }
 
     @Override
-    public void close() {
+    public void close() throws IOException {
+        flush();
     }
 }

src/main/java/net/woggioni/jwo/UncloseableWriter.java

@@ -10,5 +10,7 @@ public class UncloseableWriter extends FilterWriter {
     }
 
     @Override
-    public void close() throws IOException {}
+    public void close() throws IOException {
+        flush();
+    }
 }

src/main/java9/module-info.java

@@ -7,5 +7,6 @@ module net.woggioni.jwo {
     exports net.woggioni.jwo;
     exports net.woggioni.jwo.exception;
     exports net.woggioni.jwo.url.classpath;
+    exports net.woggioni.jwo.url.jpms;
     exports net.woggioni.jwo.xml;
 }

src/main/java9/net/woggioni/jwo/url/jpms/Handler.java

@@ -0,0 +1,52 @@
+package net.woggioni.jwo.url.jpms;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.Module;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+import java.util.Optional;
+
+public class Handler extends URLStreamHandler {
+    private final ClassLoader classLoader;
+
+    public Handler() {
+        this.classLoader = getClass().getClassLoader();
+    }
+
+    public Handler(ClassLoader classLoader) {
+        this.classLoader = classLoader;
+    }
+
+    @Override
+    protected URLConnection openConnection(URL u) throws IOException {
+        final Module thisModule = getClass().getModule();
+        final Module sourceModule = Optional.ofNullable(thisModule)
+                .map(Module::getLayer)
+                .flatMap(layer -> {
+                    final String moduleName = u.getHost();
+                    return layer.findModule(moduleName);
+                }).orElse(thisModule);
+        return new ModuleResourceURLConnection(u, sourceModule);
+    }
+
+    private static class ModuleResourceURLConnection extends URLConnection {
+        private final Module module;
+
+        private ModuleResourceURLConnection(URL url, Module module) {
+            super(url);
+            this.module = module;
+        }
+
+        @Override
+        public void connect() {
+
+        }
+
+        @Override
+        public InputStream getInputStream() throws IOException {
+            return module.getResourceAsStream(getURL().getPath());
+        }
+    }
+}

src/test/java/net/woggioni/jwo/url/JpmsUrlTest.java

@@ -0,0 +1,26 @@
+package net.woggioni.jwo.url;
+
+import lombok.SneakyThrows;
+import net.woggioni.jwo.JWO;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+public class JpmsUrlTest {
+    @Test
+    @SneakyThrows
+    public void test() {
+        JWO.registerUrlProtocolHandler();
+        final var module = getClass().getModule();
+        final var url = new URL("jpms://net.woggioni.jwo.test.module/my/test/resource/file.txt");
+        final var baos = new ByteArrayOutputStream();
+        try(final var is = url.openConnection().getInputStream()) {
+            JWO.copy(is, baos);
+        }
+        final var content = baos.toString(StandardCharsets.UTF_8);
+        Assertions.assertEquals("test", content);
+    }
+}