/*

 * Copyright (c) 2018, 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

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package java.lang.constant;

import java.lang.invoke.MethodHandles;

import sun.invoke.util.Wrapper;

import static java.util.Objects.requireNonNull;

/**

 * A <a href="package-summary.html#nominal">nominal descriptor</a> for the class

 * constant corresponding to a primitive type (e.g., {@code int.class}).

 */

final class PrimitiveClassDescImpl

        extends DynamicConstantDesc<Class<?>> implements ClassDesc {

    private final String descriptor;

    /**

     * Creates a {@linkplain ClassDesc} given a descriptor string for a primitive

     * type.

     *

     * @param descriptor the descriptor string, which must be a one-character

     * string corresponding to one of the nine base types

     * @throws IllegalArgumentException if the descriptor string does not

     * describe a valid primitive type

     * @jvms 4.3 Descriptors

     */

    PrimitiveClassDescImpl(String descriptor) {

        super(ConstantDescs.BSM_PRIMITIVE_CLASS, requireNonNull(descriptor), ConstantDescs.CD_Class);

        if (descriptor.length() != 1

            || "VIJCSBFDZ".indexOf(descriptor.charAt(0)) < 0)

            throw new IllegalArgumentException(String.format("not a valid primitive type descriptor: %s", descriptor));

        this.descriptor = descriptor;

    }

    @Override

    public String descriptorString() {

        return descriptor;

    }

    @Override

    public Class<?> resolveConstantDesc(MethodHandles.Lookup lookup) {

        return Wrapper.forBasicType(descriptorString().charAt(0)).primitiveType();

    }

    @Override

    public String toString() {

        return String.format("PrimitiveClassDesc[%s]", displayName());

    }

}