/*
* 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.Pointer;
import jnr.ffi.Struct;
import jnr.ffi.mapper.FromNativeContext;
import jnr.ffi.mapper.FromNativeConverter;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* Converts a native pointer result into a {@link jnr.ffi.Struct}
*/
public class StructByReferenceFromNativeConverter implements FromNativeConverter<Struct, Pointer> {
private final Constructor<? extends Struct> constructor;
public static FromNativeConverter<Struct, Pointer> getInstance(Class structClass, FromNativeContext toNativeContext) {
try {
return new StructByReferenceFromNativeConverter(structClass.getConstructor(jnr.ffi.Runtime.class));
} catch (NoSuchMethodException nsme) {
throw new RuntimeException(structClass.getName() + " has no constructor that accepts jnr.ffi.Runtime");
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
StructByReferenceFromNativeConverter(Constructor<? extends Struct> constructor) {
this.constructor = constructor;
}
@Override
public Struct fromNative(Pointer nativeValue, FromNativeContext context) {
try {
Struct s = constructor.newInstance(context.getRuntime());
s.useMemory(nativeValue);
return s;
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
@Override
public Class<Pointer> nativeType() {
return Pointer.class;
}
}