src/java.base/share/classes/java/lang/classfile/constantpool/PackageEntry.java - master - wstartsev/jdk

src/java.base/share/classes/java/lang/classfile/constantpool/PackageEntry.java

76 строк3 KB

Chen Liang

8342206: Convenience method to check if a constant pool entry matches nominal descriptors

29 апр 2025, 06:06

29 апр 2025, 06:06e4cb49f

/*
 * Copyright (c) 2022, 2025, 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.classfile.constantpool;

import java.lang.constant.PackageDesc;

import jdk.internal.classfile.impl.AbstractPoolEntry;

/**
 * Models a {@code CONSTANT_Package_info}, representing a package, in the
 * constant pool of a {@code class} file.
 * <p>
 * The use of a {@code PackageEntry} is represented by a {@link PackageDesc}
 * that does not represent the unnamed package.  Conversions are through
 * {@link ConstantPoolBuilder#packageEntry(PackageDesc)} and
 * {@link #asSymbol()}.
 * <p>
 * A package entry is composite:
 * {@snippet lang=text :
 * // @link substring="PackageEntry" target="ConstantPoolBuilder#packageEntry(Utf8Entry)" :
 * PackageEntry(Utf8Entry name) // @link substring="name" target="#name()"
 * }
 * where {@code name} is the {@linkplain ClassEntry##internalname internal form}
 * of a binary package name and is not empty.
 *
 * @jvms 4.4.12 The {@code CONSTANT_Package_info} Structure
 * @since 24
 */
public sealed interface PackageEntry extends PoolEntry
        permits AbstractPoolEntry.PackageEntryImpl {
    /**
     * {@return the {@linkplain ClassEntry##internalname internal form} of the
     * {@linkplain #asSymbol() package} name}
     */
    Utf8Entry name();

    /**
     * {@return a symbolic descriptor for the {@linkplain #name() package name}}
     *
     * @apiNote
     * If only symbol equivalence is desired, {@link #matches(PackageDesc)
     * matches} should be used.  It requires reduced parsing and can
     * improve {@code class} file reading performance.
     */
    PackageDesc asSymbol();

    /**
     * {@return whether this entry describes the given package}
     *
     * @param desc the package descriptor
     * @since 25
     */
    boolean matches(PackageDesc desc);
}