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path: root/include/jvmaccess/classpath.hxx
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you 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 .
 */

#ifndef INCLUDED_JVMACCESS_CLASSPATH_HXX
#define INCLUDED_JVMACCESS_CLASSPATH_HXX

#include <jvmaccess/jvmaccessdllapi.h>
#include <sal/config.h>
#include <com/sun/star/uno/Reference.hxx>

#include "jni.h"

namespace com { namespace sun { namespace star { namespace uno {
    class XComponentContext;
} } } }

namespace jvmaccess {

/**
   Helper functions for class path handling.
*/
class JVMACCESS_DLLPUBLIC ClassPath {
public:
    /**
       translates a class path into a java.net.URL[] instance.

       @param context
       a component context; must not be null.

       @param environment
       a JNI environment; must not be null.

       @param classPath
       a list of zero or more internal (see the
       com.sun.star.uri.ExternalUriReferenceTranslator service) URI references,
       where any space characters (U+0020) are ignored (and, in particular,
       separate adjacent URI references).  Any vnd.sun.star.expand URL
       references in the list are expanded using the
       com.sun.star.util.theMacroExpander singleton of the given context.

       @returns
       a local reference to a java.net.URL[] instance containing the external
       (see the com.sun.star.uri.ExternalUriReferenceTranslator service)
       equivalents of all the URI references in the given classPath.  If null, a
       (still pending) JNI exception occurred.

       @throws com::sun::star::uno::RuntimeException
    */
    static inline ::jobjectArray
    translateToUrls(
        ::com::sun::star::uno::Reference<
        ::com::sun::star::uno::XComponentContext > const & context,
        ::JNIEnv * environment, OUString const & classPath)
    {
        return
            static_cast< ::jobjectArray >(
                doTranslateToUrls(context, environment, classPath));
    }

    /**
       loads a class via a java.net.URLClassLoader.

       @param context
       a component context; must not be null.

       @param environment
       a JNI environment; must not be null.

       @param classPath
       a list of zero or more internal (see the
       com.sun.star.uri.ExternalUriReferenceTranslator service) URI references,
       where any space characters (U+0020) are ignored (and, in particular,
       separate adjacent URI references).  Any vnd.sun.star.expand URL
       references in the list are expanded using the
       com.sun.star.util.theMacroExpander singleton of the given context.

       @param name
       the Java binary name of the class to load.

       @returns
       a local reference to a java.lang.Class instance.  If null, a (still
       pending) JNI exception occurred.

       @throws com::sun::star::uno::RuntimeException
    */
    static inline ::jclass loadClass(
        ::com::sun::star::uno::Reference<
        ::com::sun::star::uno::XComponentContext > const & context,
        ::JNIEnv * environment, OUString const & classPath,
        OUString const & name)
    {
        return
            static_cast< ::jclass >(
                doLoadClass(context, environment, classPath, name));
    }

private:
    ClassPath() SAL_DELETED_FUNCTION; //TODO: get rid of this class
    ClassPath(ClassPath &) SAL_DELETED_FUNCTION;
    ~ClassPath() SAL_DELETED_FUNCTION;
    void operator =(ClassPath &) SAL_DELETED_FUNCTION;

    // Functions that replace JNIEnv, jobjectArray, and jclass with void *, so
    // that their mangled C++ names do not depend on the JDK version used at
    // compile time:

    static void * doTranslateToUrls(
        ::com::sun::star::uno::Reference<
        ::com::sun::star::uno::XComponentContext > const & context,
        void * environment, OUString const & classPath);

    static void * doLoadClass(
        ::com::sun::star::uno::Reference<
        ::com::sun::star::uno::XComponentContext > const & context,
        void * environment, OUString const & classPath,
        OUString const & name);
};

}

#endif

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */