/*

 * Copyright (c) 2014, 2019, 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.

 *

 * 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 jdk.vm.ci.hotspot;

import java.util.Objects;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.VMConstant;

final class HotSpotMetaspaceConstantImpl implements HotSpotMetaspaceConstant, VMConstant {

    static HotSpotMetaspaceConstantImpl forMetaspaceObject(MetaspaceObject metaspaceObject, boolean compressed) {

        return new HotSpotMetaspaceConstantImpl(metaspaceObject, compressed);

    }

    static MetaspaceObject getMetaspaceObject(Constant constant) {

        return ((HotSpotMetaspaceConstantImpl) constant).metaspaceObject;

    }

    private final MetaspaceObject metaspaceObject;

    private final boolean compressed;

    private HotSpotMetaspaceConstantImpl(MetaspaceObject metaspaceObject, boolean compressed) {

        this.metaspaceObject = metaspaceObject;

        this.compressed = compressed;

    }

    @Override

    public int hashCode() {

        return System.identityHashCode(metaspaceObject) ^ (compressed ? 1 : 2);

    }

    @Override

    public boolean equals(Object o) {

        if (o == this) {

            return true;

        }

        if (!(o instanceof HotSpotMetaspaceConstantImpl)) {

            return false;

        }

        HotSpotMetaspaceConstantImpl other = (HotSpotMetaspaceConstantImpl) o;

        return Objects.equals(this.metaspaceObject, other.metaspaceObject) && this.compressed == other.compressed;

    }

    @Override

    public String toValueString() {

        return String.format("meta{%s%s}", metaspaceObject, compressed ? ";compressed" : "");

    }

    @Override

    public String toString() {

        return toValueString();

    }

    @Override

    public boolean isDefaultForKind() {

        return false;

    }

    @Override

    public boolean isCompressed() {

        return compressed;

    }

    @Override

    public Constant compress() {

        assert !isCompressed();

        HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, true);

        assert res.isCompressed();

        return res;

    }

    @Override

    public Constant uncompress() {

        assert isCompressed();

        HotSpotMetaspaceConstantImpl res = HotSpotMetaspaceConstantImpl.forMetaspaceObject(metaspaceObject, false);

        assert !res.isCompressed();

        return res;

    }

    @Override

    public HotSpotResolvedObjectType asResolvedJavaType() {

        if (metaspaceObject instanceof HotSpotResolvedObjectType) {

            return (HotSpotResolvedObjectType) metaspaceObject;

        }

        return null;

    }

    @Override

    public HotSpotResolvedJavaMethod asResolvedJavaMethod() {

        if (metaspaceObject instanceof HotSpotResolvedJavaMethod) {

            return (HotSpotResolvedJavaMethod) metaspaceObject;

        }

        return null;

    }

}