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/*
 * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.svm.hosted.meta;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;

import com.oracle.svm.core.graal.meta.SharedConstantReflectionProvider;
import com.oracle.svm.core.hub.DynamicHub;
import com.oracle.svm.core.meta.SubstrateObjectConstant;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.SVMHost;

import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.MemoryAccessProvider;
import jdk.vm.ci.meta.ResolvedJavaType;

@Platforms(Platform.HOSTED_ONLY.class)
public class HostedConstantReflectionProvider extends SharedConstantReflectionProvider {
    private final SVMHost hostVM;
    private final HostedUniverse universe;
    private final HostedMemoryAccessProvider memoryAccess;

    public HostedConstantReflectionProvider(SVMHost hostVM, HostedUniverse universe, HostedMemoryAccessProvider memoryAccess) {
        this.hostVM = hostVM;
        this.universe = universe;
        this.memoryAccess = memoryAccess;
    }

    @Override
    public MemoryAccessProvider getMemoryAccessProvider() {
        return memoryAccess;
    }

    @Override
    public ResolvedJavaType asJavaType(Constant constant) {
        if (constant instanceof SubstrateObjectConstant) {
            Object obj = SubstrateObjectConstant.asObject(constant);
            if (obj instanceof DynamicHub) {
                return universe.lookup(hostVM.lookupType((DynamicHub) obj));
            } else if (obj instanceof Class) {
                throw VMError.shouldNotReachHere("Must not have java.lang.Class object: " + obj);
            }
        }
        return null;
    }

    @Override
    public JavaConstant asJavaClass(ResolvedJavaType type) {
        return SubstrateObjectConstant.forObject(hostVM.dynamicHub(((HostedType) type).wrapped));
    }
}