src/jdk.compiler/share/classes/com/sun/source/tree/InstanceOfTree.java - master - githubmirror/galahad

src/jdk.compiler/share/classes/com/sun/source/tree/InstanceOfTree.java
101 строка3 KB
Jan Lahoda
8348906: InstanceOfTree#getType doesn't specify when it returns null
20 май 2025, 05:40
20 май 2025, 05:4039d8d10
/*
 * Copyright (c) 2005, 2024, 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.sun.source.tree;

/**
 * A tree node for an {@code instanceof} expression.
 *
 * For example:
 * <pre>
 *   <em>expression</em> instanceof <em>type</em>
 *
 *   <em>expression</em> instanceof <em>pattern</em>
 * </pre>
 *
 * @jls 15.20.2 The instanceof Operator
 *
 * @author Peter von der Ah&eacute;
 * @author Jonathan Gibbons
 * @since 1.6
 */
public interface InstanceOfTree extends ExpressionTree {

    /**
     * Returns the expression to be tested.
     * @return the expression
     */
    ExpressionTree getExpression();

    /**
     * Returns the type for which to check, or {@code null} if this {@code instanceof}
     * uses a pattern other the {@link BindingPatternTree}.
     *
     * <p>For {@code instanceof} without a pattern, i.e. in the following form:
     * <pre>
     *   <em>expression</em> instanceof <em>type</em>
     * </pre>
     * returns the type.
     *
     * <p>For {@code instanceof} with a {@link BindingPatternTree}, i.e. in the following form:
     * <pre>
     *   <em>expression</em> instanceof <em>type</em> <em>variable_name</em>
     * </pre>
     * returns the type.
     *
     * <p>For instanceof with a pattern, i.e. in the following form:
     * <pre>
     *   <em>expression</em> instanceof <em>pattern</em>
     * </pre>
     * returns {@code null}.
     *
     * @return the type or {@code null} if this {@code instanceof} uses a pattern other than
     *         the {@linkplain BindingPatternTree}
     * @see #getPattern()
     */
    Tree getType();

    /**
     * Returns the tested pattern, or {@code null} if this {@code instanceof} does not use
     * a pattern.
     *
     * <p>For instanceof with a pattern, i.e. in the following form:
     * <pre>
     *   <em>expression</em> instanceof <em>pattern</em>
     * </pre>
     * returns the pattern.
     *
     * <p>For {@code instanceof} without a pattern, i.e. in the following form:
     * <pre>
     *   <em>expression</em> instanceof <em>type</em>
     * </pre>
     * returns {@code null}.
     *
     * @return the tested pattern, or {@code null} if this {@code instanceof} does not use a pattern
     * @since 16
     */
    PatternTree getPattern();

}