GUAC-868: Implement FilteredGuacamoleWriter and test.

guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleWriterTest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.glyptodon.guacamole.protocol;
+
+import java.io.StringWriter;
+import org.glyptodon.guacamole.GuacamoleException;
+import org.glyptodon.guacamole.io.GuacamoleWriter;
+import org.glyptodon.guacamole.io.WriterGuacamoleWriter;
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+/**
+ * Test which validates filtering of Guacamole instructions with
+ * FilteredGuacamoleWriter.
+ *
+ * @author Michael Jumper
+ */
+public class FilteredGuacamoleWriterTest {
+
+    /**
+     * Filter which allows through "yes" instructions but drops all others.
+     */
+    private class TestFilter implements GuacamoleFilter {
+
+        @Override
+        public GuacamoleInstruction filter(GuacamoleInstruction instruction) throws GuacamoleException {
+
+            if (instruction.getOpcode().equals("yes"))
+                return instruction;
+
+            return null;
+            
+        }
+
+    }
+    
+    @Test
+    public void testFilter() throws Exception {
+
+        StringWriter stringWriter = new StringWriter();
+        GuacamoleWriter writer = new FilteredGuacamoleWriter(new WriterGuacamoleWriter(stringWriter),
+                                                             new TestFilter());
+
+        // Write a few chunks of complete instructions
+        writer.write("3.yes,1.A;2.no,1.B;3.yes,1.C;3.yes,1.D;4.nope,1.E;".toCharArray());
+        writer.write("1.n,3.abc;3.yes,5.hello;2.no,4.test;3.yes,5.world;".toCharArray());
+
+        // Validate filtered results
+        assertEquals("3.yes,1.A;3.yes,1.C;3.yes,1.D;3.yes,5.hello;3.yes,5.world;", stringWriter.toString());
+
+    }
+    
+}