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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 | +} | |