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101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package java.lang.foreign;
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import java.util.Objects;
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import java.util.Optional;
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/**
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* A padding layout. A padding layout specifies the size of extra space which is typically not accessed by applications,
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* and is typically used for aligning member layouts around word boundaries.
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*
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* @implSpec
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* This class is immutable, thread-safe and <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>.
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*/
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/* package-private */ final class PaddingLayout extends AbstractLayout implements MemoryLayout {
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PaddingLayout(long size) {
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this(size, 1, Optional.empty());
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}
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PaddingLayout(long size, long alignment, Optional<String> name) {
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super(size, alignment, name);
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}
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@Override
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public String toString() {
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return decorateLayoutString("x" + bitSize());
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}
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@Override
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public boolean equals(Object other) {
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if (this == other) {
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return true;
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}
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if (!super.equals(other)) {
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return false;
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}
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if (!(other instanceof PaddingLayout p)) {
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return false;
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}
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return bitSize() == p.bitSize();
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}
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@Override
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public int hashCode() {
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return Objects.hash(super.hashCode(), bitSize());
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}
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@Override
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PaddingLayout dup(long alignment, Optional<String> name) {
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return new PaddingLayout(bitSize(), alignment, name);
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}
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@Override
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public boolean hasNaturalAlignment() {
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return true;
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}
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//hack: the declarations below are to make javadoc happy; we could have used generics in AbstractLayout
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//but that causes issues with javadoc, see JDK-8224052
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/**
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* {@inheritDoc}
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*/
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@Override
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public PaddingLayout withName(String name) {
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return (PaddingLayout)super.withName(name);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public PaddingLayout withBitAlignment(long alignmentBits) {
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return (PaddingLayout)super.withBitAlignment(alignmentBits);
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}
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}
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