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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | /* | ||
| 27 | * (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved | ||
| 28 | * (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved | ||
| 29 | * | ||
| 30 | * The original version of this source code and documentation is | ||
| 31 | * copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary | ||
| 32 | * of IBM. These materials are provided under terms of a License | ||
| 33 | * Agreement between Taligent and Sun. This technology is protected | ||
| 34 | * by multiple US and International patents. | ||
| 35 | * | ||
| 36 | * This notice and attribution to Taligent may not be removed. | ||
| 37 | * Taligent is a registered trademark of Taligent, Inc. | ||
| 38 | * | ||
| 39 | */ | ||
| 40 | |||
| 41 | package java.awt.font; | ||
| 42 | |||
| 43 | import java.awt.geom.AffineTransform; | ||
| 44 | import java.io.Serializable; | ||
| 45 | import java.io.ObjectStreamException; | ||
| 46 | |||
| 47 | /** | ||
| 48 | * The <code>TransformAttribute</code> class provides an immutable | ||
| 49 | * wrapper for a transform so that it is safe to use as an attribute. | ||
| 50 | */ | ||
| 51 | public final class TransformAttribute implements Serializable { | ||
| 52 | |||
| 53 | /** | ||
| 54 | * The <code>AffineTransform</code> for this | ||
| 55 | * <code>TransformAttribute</code>, or <code>null</code> | ||
| 56 | * if <code>AffineTransform</code> is the identity transform. | ||
| 57 | */ | ||
| 58 | private AffineTransform transform; | ||
| 59 | |||
| 60 | /** | ||
| 61 | * Wraps the specified transform. The transform is cloned and a | ||
| 62 | * reference to the clone is kept. The original transform is unchanged. | ||
| 63 | * If null is passed as the argument, this constructor behaves as though | ||
| 64 | * it were the identity transform. (Note that it is preferable to use | ||
| 65 | * {@link #IDENTITY} in this case.) | ||
| 66 | * @param transform the specified {@link AffineTransform} to be wrapped, | ||
| 67 | * or null. | ||
| 68 | */ | ||
| 69 | public TransformAttribute(AffineTransform transform) { | ||
| 70 | if (transform != null && !transform.isIdentity()) { | ||
| 71 | this.transform = new AffineTransform(transform); | ||
| 72 | } | ||
| 73 | } | ||
| 74 | |||
| 75 | /** | ||
| 76 | * Returns a copy of the wrapped transform. | ||
| 77 | * @return a <code>AffineTransform</code> that is a copy of the wrapped | ||
| 78 | * transform of this <code>TransformAttribute</code>. | ||
| 79 | */ | ||
| 80 | public AffineTransform getTransform() { | ||
| 81 | AffineTransform at = transform; | ||
| 82 | return (at == null) ? new AffineTransform() : new AffineTransform(at); | ||
| 83 | } | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Returns <code>true</code> if the wrapped transform is | ||
| 87 | * an identity transform. | ||
| 88 | * @return <code>true</code> if the wrapped transform is | ||
| 89 | * an identity transform; <code>false</code> otherwise. | ||
| 90 | * @since 1.4 | ||
| 91 | */ | ||
| 92 | public boolean isIdentity() { | ||
| 93 | return transform == null; | ||
| 94 | } | ||
| 95 | |||
| 96 | /** | ||
| 97 | * A <code>TransformAttribute</code> representing the identity transform. | ||
| 98 | * @since 1.6 | ||
| 99 | */ | ||
| 100 | public static final TransformAttribute IDENTITY = new TransformAttribute(null); | ||
| 101 | |||
| 102 | private void writeObject(java.io.ObjectOutputStream s) | ||
| 103 | throws java.lang.ClassNotFoundException, | ||
| 104 | java.io.IOException | ||
| 105 | { | ||
| 106 | // sigh -- 1.3 expects transform is never null, so we need to always write one out | ||
| 107 | if (this.transform == null) { | ||
| 108 | this.transform = new AffineTransform(); | ||
| 109 | } | ||
| 110 | s.defaultWriteObject(); | ||
| 111 | } | ||
| 112 | |||
| 113 | /* | ||
| 114 | * @since 1.6 | ||
| 115 | */ | ||
| 116 | private Object readResolve() throws ObjectStreamException { | ||
| 117 | if (transform == null || transform.isIdentity()) { | ||
| 118 | return IDENTITY; | ||
| 119 | } | ||
| 120 | return this; | ||
| 121 | } | ||
| 122 | |||
| 123 | // Added for serial backwards compatability (4348425) | ||
| 124 | static final long serialVersionUID = 3356247357827709530L; | ||
| 125 | |||
| 126 | /** | ||
| 127 | * @since 1.6 | ||
| 128 | */ | ||
| 129 | public int hashCode() { | ||
| 130 | return transform == null ? 0 : transform.hashCode(); | ||
| 131 | } | ||
| 132 | |||
| 133 | /** | ||
| 134 | * Returns <code>true</code> if rhs is a <code>TransformAttribute</code> | ||
| 135 | * whose transform is equal to this <code>TransformAttribute</code>'s | ||
| 136 | * transform. | ||
| 137 | * @param rhs the object to compare to | ||
| 138 | * @return <code>true</code> if the argument is a <code>TransformAttribute</code> | ||
| 139 | * whose transform is equal to this <code>TransformAttribute</code>'s | ||
| 140 | * transform. | ||
| 141 | * @since 1.6 | ||
| 142 | */ | ||
| 143 | public boolean equals(Object rhs) { | ||
| 144 | try { | ||
| 145 | TransformAttribute that = (TransformAttribute)rhs; | ||
| 146 | if (transform == null) { | ||
| 147 | return that.transform == null; | ||
| 148 | } | ||
| 149 | return transform.equals(that.transform); | ||
| 150 | } | ||
| 151 | catch (ClassCastException e) { | ||
| 152 | } | ||
| 153 | return false; | ||
| 154 | } | ||
| 155 | } | ||