//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.websocket.common.events.annotated;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.WebSocketException;
import org.eclipse.jetty.websocket.api.util.QuoteUtil;
public class EventMethod
{
private static final Logger LOG = Log.getLogger(EventMethod.class);
private static Object[] dropFirstArg(Object[] args)
{
if (args.length == 1)
{
return new Object[0];
}
Object ret[] = new Object[args.length - 1];
System.arraycopy(args,1,ret,0,ret.length);
return ret;
}
protected Class<?> pojo;
protected Method method;
private boolean hasSession = false;
private boolean isStreaming = false;
private Class<?>[] paramTypes;
public EventMethod(Class<?> pojo, Method method)
{
this.pojo = pojo;
this.paramTypes = method.getParameterTypes();
this.method = method;
identifyPresentParamTypes();
}
public EventMethod(Class<?> pojo, String methodName, Class<?>... paramTypes)
{
try
{
this.pojo = pojo;
this.paramTypes = paramTypes;
this.method = pojo.getMethod(methodName,paramTypes);
identifyPresentParamTypes();
}
catch (NoSuchMethodException | SecurityException e)
{
LOG.warn("Cannot use method {}({}): {}",methodName,paramTypes,e.getMessage());
this.method = null;
}
}
public void call(Object obj, Object... args)
{
if ((this.pojo == null) || (this.method == null))
{
LOG.warn("Cannot execute call: pojo={}, method={}",pojo,method);
return; // no call event method determined
}
if (obj == null)
{
LOG.warn("Cannot call {} on null object",this.method);
return;
}
if (args.length > paramTypes.length)
{
Object trimArgs[] = dropFirstArg(args);
call(obj,trimArgs);
return;
}
if (args.length < paramTypes.length)
{
throw new IllegalArgumentException("Call arguments length [" + args.length + "] must always be greater than or equal to captured args length ["
+ paramTypes.length + "]");
}
try
{
this.method.invoke(obj,args);
}
catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e)
{
String err = String.format("Cannot call method %s on %s with args: %s",method,pojo, QuoteUtil.join(args,","));
throw new WebSocketException(err,e);
}
}
public Method getMethod()
{
return method;
}
protected Class<?>[] getParamTypes()
{
return this.paramTypes;
}
private void identifyPresentParamTypes()
{
this.hasSession = false;
this.isStreaming = false;
if (paramTypes == null)
{
return;
}
for (Class<?> paramType : paramTypes)
{
if (Session.class.isAssignableFrom(paramType))
{
this.hasSession = true;
}
if (Reader.class.isAssignableFrom(paramType) || InputStream.class.isAssignableFrom(paramType))
{
this.isStreaming = true;
}
}
}
public boolean isHasSession()
{
return hasSession;
}
public boolean isStreaming()
{
return isStreaming;
}
}