com.kenai.jffi.Type Maven / Gradle / Ivy
/*
* Copyright (C) 2008, 2009 Wayne Meissner
*
* This file is part of jffi.
*
* 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.
*
*
* Alternatively, 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.
*
* This code 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 this work. If not, see types) {
long[] nativeTypes = new long[types.size()];
for (int i = 0; i < nativeTypes.length; ++i) {
nativeTypes[i] = types.get(i).handle();
}
return nativeTypes;
}
/**
* Creates a Type instance for builtin types.
*
* @param nativeType The builtin type enum.
* @return A Type instance.
*/
private static Type builtin(NativeType nativeType) {
return new Builtin(nativeType);
}
/**
* Types that are built-in to libffi.
*/
static final class Builtin extends Type {
private final NativeType nativeType;
private TypeInfo typeInfo;
private Builtin(NativeType nativeType) {
this.nativeType = nativeType;
}
TypeInfo getTypeInfo() {
return typeInfo != null ? typeInfo : lookupTypeInfo();
}
private TypeInfo lookupTypeInfo() {
try {
Foreign foreign = Foreign.getInstance();
long handle = foreign.lookupBuiltinType(nativeType.ffiType);
if (handle == 0L) {
throw new NullPointerException("invalid handle for native type " + nativeType);
}
return typeInfo = new TypeInfo(handle, foreign.getTypeType(handle), foreign.getTypeSize(handle), foreign.getTypeAlign(handle));
} catch (Throwable error) {
throw new UnsatisfiedLinkError(
"could not get native definition for type `" + nativeType
+ "`, original error message follows: " + error.getLocalizedMessage());
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
Builtin builtin = (Builtin) o;
if (nativeType != builtin.nativeType) return false;
return true;
}
@Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + nativeType.hashCode();
return result;
}
}
/**
* This is a lazy loaded cache of builtin type info, so we can still have
* Type.VOID as a public static variable without it causing the
* native library to load.
*/
static final class TypeInfo {
/** The FFI type of this type */
final int type;
/** The size in bytes of this type */
final int size;
/** The minimum alignment of this type */
final int alignment;
/** The address of this type's ffi_type structure */
final long handle;
TypeInfo(long handle, int type, int size, int alignment) {
this.handle = handle;
this.type = type;
this.size = size;
this.alignment = alignment;
}
}
}