/*
* Copyright (C) 2012 Wayne Meissner
*
* This file is part of the JNR project.
*
* Licensed 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 jnr.ffi.provider.converters;
import jnr.ffi.Memory;
import jnr.ffi.Pointer;
import jnr.ffi.byref.ByReference;
import jnr.ffi.mapper.ToNativeContext;
import jnr.ffi.mapper.ToNativeConverter;
import jnr.ffi.provider.ParameterFlags;
/**
*
*/
@ToNativeConverter.Cacheable
public class ByReferenceParameterConverter implements ToNativeConverter<ByReference, Pointer> {
private static final ToNativeConverter<ByReference, Pointer> IN = new ByReferenceParameterConverter(ParameterFlags.IN);
private static final ToNativeConverter<ByReference, Pointer> OUT = new ByReferenceParameterConverter.Out(ParameterFlags.OUT);
private static final ToNativeConverter<ByReference, Pointer> INOUT = new ByReferenceParameterConverter.Out(ParameterFlags.IN | ParameterFlags.OUT);
private final int parameterFlags;
private ByReferenceParameterConverter(int parameterFlags) {
this.parameterFlags = parameterFlags;
}
public static ToNativeConverter<ByReference, Pointer> getInstance(ToNativeContext toNativeContext) {
int parameterFlags = ParameterFlags.parse(toNativeContext.getAnnotations());
return ParameterFlags.isOut(parameterFlags) ? ParameterFlags.isIn(parameterFlags) ? INOUT : OUT : IN;
}
public Pointer toNative(ByReference value, ToNativeContext context) {
if (value == null) {
return null;
}
Pointer memory = Memory.allocate(context.getRuntime(), value.nativeSize(context.getRuntime()));
if (ParameterFlags.isIn(parameterFlags)) {
value.toNative(context.getRuntime(), memory, 0);
}
return memory;
}
public Class<Pointer> nativeType() {
return Pointer.class;
}
public static final class Out extends ByReferenceParameterConverter implements ToNativeConverter.PostInvocation<ByReference, Pointer> {
public Out(int parameterFlags) {
super(parameterFlags);
}
public void postInvoke(ByReference byReference, Pointer pointer, ToNativeContext context) {
if (byReference != null && pointer != null) {
byReference.fromNative(context.getRuntime(), pointer, 0);
}
}
}
}