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package jnr.ffi.provider.converters;

import jnr.ffi.Pointer;
import jnr.ffi.Struct;
import jnr.ffi.mapper.ToNativeContext;
import jnr.ffi.mapper.ToNativeConverter;
import jnr.ffi.provider.ParameterFlags;

@ToNativeConverter.NoContext
@ToNativeConverter.Cacheable
public final class StructByReferenceToNativeConverter implements ToNativeConverter {
    private final int flags;

    public static ToNativeConverter getInstance(ToNativeContext toNativeContext) {
        return new StructByReferenceToNativeConverter(ParameterFlags.parse(toNativeContext.getAnnotations()));
    }

    StructByReferenceToNativeConverter(int flags) {
        this.flags = flags;
    }

    public Class nativeType() {
        return Pointer.class;
    }

    public Pointer toNative(Struct value, ToNativeContext ctx) {
        return value != null ? Struct.getMemory(value, flags) : null;
    }
}