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Type.java
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Type.java
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/*
* 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 <http://www.gnu.org/licenses/>.
*/
package com.kenai.jffi;
import java.util.List;
/**
* Native parameter and return types.
*/
public abstract class Type {
/** The native void type */
public static final Type VOID = builtin(NativeType.VOID);
/** The native float type */
public static final Type FLOAT = builtin(NativeType.FLOAT);
/** The native double type */
public static final Type DOUBLE = builtin(NativeType.DOUBLE);
/** The native long double type */
public static final Type LONGDOUBLE = builtin(NativeType.LONGDOUBLE);
/** The native unsigned 8 bit integer type */
public static final Type UINT8 = builtin(NativeType.UINT8);
/** The native signed 8 bit integer type */
public static final Type SINT8 = builtin(NativeType.SINT8);
/** The native unsigned 16 bit integer type */
public static final Type UINT16 = builtin(NativeType.UINT16);
/** The native signed 16 bit integer type */
public static final Type SINT16 = builtin(NativeType.SINT16);
/** The native unsigned 32 bit integer type */
public static final Type UINT32 = builtin(NativeType.UINT32);
/** The native signed 32 bit integer type */
public static final Type SINT32 = builtin(NativeType.SINT32);
/** The native unsigned 64 bit integer type */
public static final Type UINT64 = builtin(NativeType.UINT64);
/** The native signed 64 bit integer type */
public static final Type SINT64 = builtin(NativeType.SINT64);
/** The native memory address type */
public static final Type POINTER = builtin(NativeType.POINTER);
/** The native unsigned char type */
public static final Type UCHAR = UINT8;
/** The native signed char type */
public static final Type SCHAR = SINT8;
/** The native unsigned short integer type */
public static final Type USHORT = UINT16;
/** The native signed short integer type */
public static final Type SSHORT = SINT16;
/** The native unsigned integer type */
public static final Type UINT = UINT32;
/** The native signed integer type */
public static final Type SINT = SINT32;
/** The native unsigned long integer type */
public static final Type ULONG = builtin(NativeType.ULONG);
/** The native signed long integer type */
public static final Type SLONG = builtin(NativeType.SLONG);
/** The native unsigned long long integer type */
public static final Type ULONG_LONG = UINT64;
/** The native signed long long integer type */
public static final Type SLONG_LONG = SINT64;
/**
* Gets the FFI type enum value for this <tt>Type</tt>
*
* @return An integer representing the FFI type.
*/
public abstract int type();
/**
* Gets the native address of the ffi_type struct for this <tt>Type</tt>
*
* @return The address of the ffi_type structure
*/
abstract long handle();
/**
* Gets the size of this type.
*
* @return The size of this type, in bytes.
*/
public abstract int size();
/**
* Gets the alignment of this type.
*
* @return The alignment of this type, in bytes.
*/
public abstract int alignment();
@Override
public boolean equals(Object obj) {
return (obj instanceof Type) && ((Type) obj).handle() == handle();
}
@Override
public int hashCode() {
int hash = 3;
hash = 67 * hash + (int) (this.handle() ^ (this.handle() >>> 32));
return hash;
}
/**
* Converts an array of <tt>Type</tt> objects into an array of pointers to
* ffi_type structures.
*
* @param types An array of <tt>Type</tt> objects
* @return An array of native ffi_type handles.
*/
final static long[] nativeHandles(Type[] types) {
long[] nativeTypes = new long[types.length];
for (int i = 0; i < types.length; ++i) {
nativeTypes[i] = types[i].handle();
}
return nativeTypes;
}
/**
* Converts a list of <tt>Type</tt> objects into an array of pointers to
* ffi_type structures.
*
* @param types A list of <tt>Type</tt> objects
* @return An array of native ffi_type handles.
*/
final static long[] nativeHandles(List<Type> 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 <tt>Type</tt> instance for builtin types.
*
* @param nativeType The builtin type enum.
* @return A <tt>Type</tt> instance.
*/
private static final 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 Builtin(NativeType nativeType) {
this.nativeType = nativeType;
}
public final int type() {
return BuiltinTypeInfo.find(nativeType).type;
}
public final long handle() {
long handle = BuiltinTypeInfo.find(nativeType).handle;
if (handle != 0L) {
return handle;
}
throw new RuntimeException("invalid handle for native type " + nativeType);
}
public final int size() {
return BuiltinTypeInfo.find(nativeType).size;
}
public final int alignment() {
return BuiltinTypeInfo.find(nativeType).alignment;
}
@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;
}
}
private static abstract class LookupTable {
public abstract BuiltinTypeInfo find(NativeType nativeType);
}
private static final class NativeLookupTable extends LookupTable {
public final BuiltinTypeInfo[] typeMap;
NativeLookupTable(Foreign foreign) {
NativeType[] nativeTypes = NativeType.values();
typeMap = new BuiltinTypeInfo[nativeTypes.length];
for (int i = 0; i < typeMap.length; ++i) {
long h = foreign.lookupBuiltinType(nativeTypes[i].ffiType);
int type, size, alignment;
if (h != 0L) {
type = foreign.getTypeType(h);
size = foreign.getTypeSize(h);
alignment = foreign.getTypeAlign(h);
} else {
// Don't fail initialization, setup a dummy type
type = nativeTypes[i].ffiType;
size = 0;
alignment = 0;
}
typeMap[i] = new BuiltinTypeInfo(h, type, size, alignment);
}
}
public BuiltinTypeInfo find(NativeType nativeType) {
return typeMap[nativeType.ordinal()];
}
}
private static final class InvalidLookupTable extends LookupTable {
private Throwable error;
private InvalidLookupTable(Throwable error) {
this.error = error;
}
public BuiltinTypeInfo find(NativeType nativeType) {
UnsatisfiedLinkError error = new UnsatisfiedLinkError("could not get native definition for type: " + nativeType);
error.initCause(this.error);
throw error;
}
}
/**
* 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.
*/
private static final class BuiltinTypeInfo {
private static final LookupTable lookupTable;
/** 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;
static {
LookupTable table;
try {
table = new NativeLookupTable(Foreign.getInstance());
} catch (Throwable error) {
table = new InvalidLookupTable(error);
}
lookupTable = table;
}
static BuiltinTypeInfo find(NativeType t) {
return lookupTable.find(t);
}
private static LookupTable newNativeLookupTable(Foreign foreign) {
return new NativeLookupTable(foreign);
}
private static LookupTable newInvalidLookupTable(Throwable error) {
return new InvalidLookupTable(error);
}
private BuiltinTypeInfo(long handle, int type, int size, int alignment) {
this.handle = handle;
this.type = type;
this.size = size;
this.alignment = alignment;
}
}
}