jnr.ffi.provider.FFIProvider Maven / Gradle / Ivy
/*
* Copyright (C) 2008-2011 Wayne Meissner
*
* This file is part of the JNR project.
*
* 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 jnr.ffi.provider;
import jnr.ffi.*;
/**
* This class defines the facilities a JNR FFI provider must provide.
*
* You most likely do NOT want to use this class directly
*/
public abstract class FFIProvider {
/**
* Gets an instance of FFIProvider
*
* @return an instance of FFIProvider
*/
public static FFIProvider getSystemProvider() {
return SystemProviderSingletonHolder.INSTANCE;
}
protected FFIProvider() {}
/** Gets the default Runtime for this provider */
public abstract jnr.ffi.Runtime getRuntime();
/**
* Creates a new {@link LibraryLoader} instance
*/
public abstract LibraryLoader createLibraryLoader(Class interfaceClass);
private static final class SystemProviderSingletonHolder {
private static final FFIProvider INSTANCE = getInstance();
static FFIProvider getInstance() {
String providerName = System.getProperty("jnr.ffi.provider");
if (providerName == null) {
Package pkg = FFIProvider.class.getPackage();
String pkgName = pkg != null && pkg.getName() != null ? pkg.getName() : "jnr.ffi.provider";
providerName = pkgName + ".jffi.Provider";
}
try {
return (FFIProvider) Class.forName(providerName).newInstance();
} catch (Throwable ex) {
return newInvalidProvider("could not load FFI provider " + providerName, ex);
}
}
}
private static FFIProvider newInvalidProvider(String message, Throwable cause) {
return new InvalidProvider(message, cause);
}
}