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java/org/apache/tomcat/websocket/pojo/PojoMessageHandlerWholeBase.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tomcat.websocket.pojo;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import javax.websocket.DecodeException;
+import javax.websocket.MessageHandler;
+import javax.websocket.Session;
+
+import org.apache.tomcat.websocket.WsSession;
+
+/**
+ * Common implementation code for the POJO whole message handlers. All the real
+ * work is done in this class and in the superclass.
+ *
+ * @param <T>   The type of message to handle
+ */
+public abstract class PojoMessageHandlerWholeBase<T>
+        extends PojoMessageHandlerBase<T> implements MessageHandler.Whole<T> {
+
+    public PojoMessageHandlerWholeBase(Object pojo, Method method,
+            Session session, Object[] params, int indexPayload,
+            boolean convert, int indexSession, long maxMessageSize) {
+        super(pojo, method, session, params, indexPayload, convert,
+                indexSession, maxMessageSize);
+    }
+
+
+    @Override
+    public final void onMessage(T message) {
+
+        if (params.length == 1 && params[0] instanceof DecodeException) {
+            ((WsSession) session).getLocal().onError(session,
+                    (DecodeException) params[0]);
+            return;
+        }
+
+        // Can this message be decoded?
+        Object payload;
+        try {
+            payload = decode(message);
+        } catch (DecodeException de) {
+            ((WsSession) session).getLocal().onError(session, de);
+            return;
+        }
+
+        if (payload == null) {
+            // Not decoded. Convert if required.
+            if (convert) {
+                payload = convert(message);
+            } else {
+                payload = message;
+            }
+        }
+
+        Object[] parameters = params.clone();
+        if (indexSession != -1) {
+            parameters[indexSession] = session;
+        }
+        parameters[indexPayload] = payload;
+
+        Object result = null;
+        try {
+            result = method.invoke(pojo, parameters);
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            handlePojoMethodException(e);
+        }
+        processResult(result);
+    }
+
+    protected Object convert(T message) {
+        return message;
+    }
+
+
+    protected abstract Object decode(T message) throws DecodeException;
+    protected abstract void onClose();
+}