com.ochafik.lang.jnaerator.runtime.globals.GlobalStruct Maven / Gradle / Ivy
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/*
Copyright (c) 2009-2013 Olivier Chafik, All Rights Reserved
This file is part of JNAerator (http://jnaerator.googlecode.com/).
JNAerator 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.
JNAerator 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 JNAerator. If not, see > extends Global {
S value;
Class valueClass;
public GlobalStruct(NativeLibrary library, Class valueClass, String... symbols) {
super(library, symbols);
this.valueClass = valueClass;
}
public S get() {
if (value == null) {
value = newInstance();
Pointer p = getPointer();
if (!isByValue())
p = p.getPointer(0);
value.use(p);
}
value.read();
return value;
}
protected S newInstance() {
try {
return valueClass.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void set(S value) {
if (isByValue()) {
Pointer p = getPointer();
int s = value.size();
p.write(0, value.getPointer().getByteArray(0, s), 0, s);
get();
} else {
this.value = value;
getPointer().setPointer(0, value.getPointer());
}
}
protected boolean isByValue() {
return com.sun.jna.Structure.ByValue.class.isAssignableFrom(valueClass);
}
}