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MsgSendInvocationMapper.java
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MsgSendInvocationMapper.java
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/*
* Copyright 2007, 2008, 2009 Duncan McGregor
*
* This file is part of Rococoa, a library to allow Java to talk to Cocoa.
*
* Rococoa is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rococoa is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Rococoa. If not, see <http://www.gnu.org/licenses/>.
*/
package org.rococoa.internal;
import com.sun.jna.InvocationMapper;
import com.sun.jna.NativeLibrary;
import org.rococoa.ID;
import org.rococoa.RococoaException;
import org.rococoa.Selector;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* A JNA InvocationMapper that maps calls to syntheticSendMessage to a MsgSendHandler.
* <p>
* This allows us to dispatch all calls to syntheticSendMessage and have MsgSendHandler
* call objc_msgSend or objc_msgSend_stret as appropriate, casting the return
* type appropriately.
*
* @author duncan
*/
public class MsgSendInvocationMapper implements InvocationMapper {
public final static Method SYNTHETIC_SEND_MSG;
public final static Method SYNTHETIC_SEND_VARARGS_MSG;
static {
try {
SYNTHETIC_SEND_MSG = MsgSendLibrary.class.getDeclaredMethod("syntheticSendMessage",
Class.class, ID.class, Selector.class, Object[].class);
} catch (Exception e) {
throw new RococoaException("Error retrieving method");
}
try {
SYNTHETIC_SEND_VARARGS_MSG = MsgSendLibrary.class.getDeclaredMethod("syntheticSendVarArgsMessage",
Class.class, ID.class, Selector.class, Object[].class);
} catch (Exception e) {
throw new RococoaException("Error retrieving method");
}
}
public InvocationHandler getInvocationHandler(NativeLibrary lib, Method m) {
if (m.equals(SYNTHETIC_SEND_MSG) || m.equals(SYNTHETIC_SEND_VARARGS_MSG)) {
// Have to late bind this, as it's the only time we get to see lib.
// Not too bad as the results are cached.
return new MsgSendHandler(lib);
}
return null; // default handler
}
}