/*

 * $Id$

 *

 * Copyright (C) 2003-2009 JNode.org

 *

 * This library is free software; 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 2.1 of the License, or

 * (at your option) any later version.

 *

 * This library 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 library; If not, write to the Free Software Foundation, Inc., 

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

package org.jnode.vm;

import java.io.Writer;

import java.util.HashMap;

import org.jnode.annotation.PrivilegedActionPragma;

import org.jnode.vm.classmgr.IMTBuilder;

import org.jnode.vm.classmgr.SelectorMap;

import org.jnode.vm.classmgr.VmIsolatedStatics;

import org.jnode.vm.classmgr.VmMethod;

import org.jnode.vm.classmgr.VmSharedStatics;

import org.jnode.vm.classmgr.VmType;

import org.jnode.vm.compiler.CompiledIMT;

import org.jnode.vm.scheduler.VmProcessor;

/**

 * @author Ewout Prangsma (epr@users.sourceforge.net)

 */

public final class VmJavaClassLoader extends VmAbstractClassLoader {

    /**

     * The java classloader

     */

    private final ClassLoader loader;

    /**

     * The system classloader

     */

    private final VmSystemClassLoader systemLoader;

    /**

     * A className to VmType map for all loaded classes

     */

    private final HashMap<String, VmType> loadedClasses = new HashMap<String, VmType>();

    /**

     * Initialize this class.

     *

     * @param loader

     */

    public VmJavaClassLoader(ClassLoader loader) {

        this.loader = loader;

        this.systemLoader = VmSystem.getSystemClassLoader();

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#asClassLoader()

     */

    public final ClassLoader asClassLoader() {

        return loader;

    }

    public void disassemble(VmMethod vmMethod, int optLevel, boolean enableTestCompilers, Writer writer) {

        systemLoader.disassemble(vmMethod, optLevel, enableTestCompilers, writer);

    }

    /**

     * Compile the given IMT.

     */

    public CompiledIMT compileIMT(IMTBuilder builder) {

        return systemLoader.compileIMT(builder);

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#findLoadedClass(java.lang.String)

     */

    public final VmType findLoadedClass(String className) {

        return (VmType) loadedClasses.get(className);

    }

    /**

     * Add a class that has been loaded.

     *

     * @param name

     * @param cls

     */

    public final void addLoadedClass(String name, VmType cls) {

        loadedClasses.put(name, cls);

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#getArchitecture()

     */

    public final VmArchitecture getArchitecture() {

        return systemLoader.getArchitecture();

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#isCompileRequired()

     */

    public final boolean isCompileRequired() {

        return systemLoader.isCompileRequired();

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#loadClass(java.lang.String,

     *      boolean)

     */

    @PrivilegedActionPragma

    public final VmType<?> loadClass(String className, boolean resolve)

        throws ClassNotFoundException {

        final VmType<?> cls;

        if (className.charAt(0) == '[') {

            cls = loadArrayClass(className, resolve);

            addLoadedClass(className, cls);

        } else {

            final Class<?> javaType = loader.loadClass(className);

            cls = VmType.fromClass((Class<?>) javaType);

        }

        if (resolve) {

            cls.link();

        }

        return cls;

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#isSystemClassLoader()

     */

    public final boolean isSystemClassLoader() {

        return false;

    }

    /**

     * @see org.jnode.vm.VmAbstractClassLoader#getSelectorMap()

     */

    protected final SelectorMap getSelectorMap() {

        return systemLoader.getSelectorMap();

    }

    /**

     * @see org.jnode.vm.VmAbstractClassLoader#getSharedStatics()

     */

    public final VmSharedStatics getSharedStatics() {

        return systemLoader.getSharedStatics();

    }

    /**

     * Gets the isolated statics table (of the current isolate)

     *

     * @return The statics table

     */

    public final VmIsolatedStatics getIsolatedStatics() {

        return VmProcessor.current().getIsolatedStatics();

    }

    /**

     * @see org.jnode.vm.classmgr.VmClassLoader#resourceExists(java.lang.String)

     */

    public final boolean resourceExists(String resName) {

        return false;

    }

}