com.bugvm.rt.bro.ptr.Ptr Maven / Gradle / Ivy
/*
* Copyright (C) 2012 RoboVM AB
*
* 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 com.bugvm.rt.bro.ptr;
import java.lang.reflect.ParameterizedType;
import java.util.concurrent.ConcurrentHashMap;
import com.bugvm.rt.VM;
import com.bugvm.rt.bro.MarshalerLookup;
import com.bugvm.rt.bro.NativeObject;
import com.bugvm.rt.bro.Struct;
import com.bugvm.rt.bro.annotation.Pointer;
import com.bugvm.rt.bro.annotation.StructMember;
/**
* Generic pointer to pointer (<type> ** in C).
*/
public abstract class Ptr> extends Struct {
private static final ConcurrentHashMap, Class> TYPE_CACHE = new ConcurrentHashMap<>();
public Ptr() {
}
public Ptr(T o) {
}
/**
* Hidden.
*/
@StructMember(0)
native @Pointer long getValue();
/**
* Hidden.
*/
@StructMember(0)
native void setValue(@Pointer long value);
public S get() {
long v = getValue();
if (v == 0L) {
return null;
}
return toObject(v);
}
@SuppressWarnings("unchecked")
public T set(S o) {
if (o == null) {
setValue(0L);
} else {
setValue(o.getHandle());
}
return (T) this;
}
@SuppressWarnings("unchecked")
public T set(long handle) {
setValue(handle);
return (T) this;
}
/**
* Copies {@code src.length} objects from {@code src} to the memory pointed
* to by this {@link Ptr}.
*
* @param src the source.
*/
public void set(S[] src) {
set(src, 0, src.length);
}
/**
* Copies {@code count} objects from {@code src} starting at offset {@code offset}
* to the memory pointed to by this {@link Ptr}.
*
* @param src the source.
* @param offset the offset within the source array to start copying from.
* @param count the number of elements to copy.
*/
public void set(S[] src, int offset, int count) {
int ptrSize = _sizeOf();
long ptr = getHandle() + ptrSize * offset;
for (int i = 0; i < count; i++) {
S o = src[i];
VM.setPointer(ptr, o == null ? 0L : o.getHandle());
ptr += ptrSize;
}
}
@SuppressWarnings("unchecked")
private S toObject(long handle) {
Class type = (Class) TYPE_CACHE.get(getClass());
if (type == null) {
type = (Class) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
TYPE_CACHE.put(getClass(), type);
}
return MarshalerLookup.toObject(type, handle);
}
}