| /* |
| * Copyright (c) 1998, 2013, 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. |
| */ |
| |
| /* |
| * (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved |
| * (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved |
| * |
| * The original version of this source code and documentation is |
| * copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary |
| * of IBM. These materials are provided under terms of a License |
| * Agreement between Taligent and Sun. This technology is protected |
| * by multiple US and International patents. |
| * |
| * This notice and attribution to Taligent may not be removed. |
| * Taligent is a registered trademark of Taligent, Inc. |
| * |
| */ |
| |
| package java.awt.font; |
| |
| import java.awt.geom.AffineTransform; |
| import java.io.Serializable; |
| import java.io.ObjectStreamException; |
| |
| /** |
| * The {@code TransformAttribute} class provides an immutable |
| * wrapper for a transform so that it is safe to use as an attribute. |
| */ |
| public final class TransformAttribute implements Serializable { |
| |
| /** |
| * The {@code AffineTransform} for this |
| * {@code TransformAttribute}, or {@code null} |
| * if {@code AffineTransform} is the identity transform. |
| */ |
| private AffineTransform transform; |
| |
| /** |
| * Wraps the specified transform. The transform is cloned and a |
| * reference to the clone is kept. The original transform is unchanged. |
| * If null is passed as the argument, this constructor behaves as though |
| * it were the identity transform. (Note that it is preferable to use |
| * {@link #IDENTITY} in this case.) |
| * @param transform the specified {@link AffineTransform} to be wrapped, |
| * or null. |
| */ |
| public TransformAttribute(AffineTransform transform) { |
| if (transform != null && !transform.isIdentity()) { |
| this.transform = new AffineTransform(transform); |
| } |
| } |
| |
| /** |
| * Returns a copy of the wrapped transform. |
| * @return an {@code AffineTransform} that is a copy of the wrapped |
| * transform of this {@code TransformAttribute}. |
| */ |
| public AffineTransform getTransform() { |
| AffineTransform at = transform; |
| return (at == null) ? new AffineTransform() : new AffineTransform(at); |
| } |
| |
| /** |
| * Returns {@code true} if the wrapped transform is |
| * an identity transform. |
| * @return {@code true} if the wrapped transform is |
| * an identity transform; {@code false} otherwise. |
| * @since 1.4 |
| */ |
| public boolean isIdentity() { |
| return transform == null; |
| } |
| |
| /** |
| * A {@code TransformAttribute} representing the identity transform. |
| * @since 1.6 |
| */ |
| public static final TransformAttribute IDENTITY = new TransformAttribute(null); |
| |
| private void writeObject(java.io.ObjectOutputStream s) |
| throws java.lang.ClassNotFoundException, |
| java.io.IOException |
| { |
| // sigh -- 1.3 expects transform is never null, so we need to always write one out |
| if (this.transform == null) { |
| this.transform = new AffineTransform(); |
| } |
| s.defaultWriteObject(); |
| } |
| |
| /* |
| * @since 1.6 |
| */ |
| private Object readResolve() throws ObjectStreamException { |
| if (transform == null || transform.isIdentity()) { |
| return IDENTITY; |
| } |
| return this; |
| } |
| |
| // Added for serial backwards compatibility (4348425) |
| static final long serialVersionUID = 3356247357827709530L; |
| |
| /** |
| * @since 1.6 |
| */ |
| public int hashCode() { |
| return transform == null ? 0 : transform.hashCode(); |
| } |
| |
| /** |
| * Returns {@code true} if rhs is a {@code TransformAttribute} |
| * whose transform is equal to this {@code TransformAttribute}'s |
| * transform. |
| * @param rhs the object to compare to |
| * @return {@code true} if the argument is a {@code TransformAttribute} |
| * whose transform is equal to this {@code TransformAttribute}'s |
| * transform. |
| * @since 1.6 |
| */ |
| public boolean equals(Object rhs) { |
| if (rhs != null) { |
| try { |
| TransformAttribute that = (TransformAttribute)rhs; |
| if (transform == null) { |
| return that.transform == null; |
| } |
| return transform.equals(that.transform); |
| } |
| catch (ClassCastException e) { |
| } |
| } |
| return false; |
| } |
| } |