1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17/**
18 * @author Ilya S. Okomin
19 * @version $Revision$
20 */
21
22package java.awt.font;
23
24import java.awt.geom.AffineTransform;
25import java.io.Serializable;
26
27import org.apache.harmony.awt.internal.nls.Messages;
28
29/**
30 * The TransformAttribute class is a wrapper for the AffineTransform class in
31 * order to use it as attribute.
32 *
33 * @since Android 1.0
34 */
35public final class TransformAttribute implements Serializable {
36
37    /**
38     * The Constant serialVersionUID.
39     */
40    private static final long serialVersionUID = 3356247357827709530L;
41
42    // affine transform of this TransformAttribute instance
43    /**
44     * The transform.
45     */
46    private AffineTransform fTransform;
47
48    /**
49     * Instantiates a new TransformAttribute from the specified AffineTransform.
50     *
51     * @param transform
52     *            the AffineTransform to be wrapped.
53     */
54    public TransformAttribute(AffineTransform transform) {
55        if (transform == null) {
56            // awt.94=transform can not be null
57            throw new IllegalArgumentException(Messages.getString("awt.94")); //$NON-NLS-1$
58        }
59        if (!transform.isIdentity()) {
60            this.fTransform = new AffineTransform(transform);
61        }
62    }
63
64    /**
65     * Gets the initial AffineTransform which is wrapped.
66     *
67     * @return the initial AffineTransform which is wrapped.
68     */
69    public AffineTransform getTransform() {
70        if (fTransform != null) {
71            return new AffineTransform(fTransform);
72        }
73        return new AffineTransform();
74    }
75
76    /**
77     * Checks if this transform is an identity transform.
78     *
79     * @return true, if this transform is an identity transform, false
80     *         otherwise.
81     */
82    public boolean isIdentity() {
83        return (fTransform == null);
84    }
85
86}
87