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comparison dwtx/jface/resource/FileImageDescriptor.d @ 4:c87617952847

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some JFace modules
author Frank Benoit <benoit@tionex.de>
date Fri, 28 Mar 2008 17:08:33 +0100
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children c884a1ab6db3
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3:6518c18a01f7 4:c87617952847
1 /*******************************************************************************
2 * Copyright (c) 2000, 2006 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.jface.resource.FileImageDescriptor;
14
15 import dwtx.jface.resource.ImageDescriptor;
16
17 // import java.io.BufferedInputStream;
18 // import java.io.FileInputStream;
19 // import java.io.FileNotFoundException;
20 // import java.io.IOException;
21 // import java.io.InputStream;
22
23 import dwt.DWT;
24 import dwt.DWTException;
25 import dwt.graphics.ImageData;
26
27 import dwt.dwthelper.utils;
28 import dwt.dwthelper.InputStream;
29 import dwt.dwthelper.FileInputStream;
30 import dwt.dwthelper.BufferedInputStream;
31
32 /**
33 * An image descriptor that loads its image information
34 * from a file.
35 */
36 class FileImageDescriptor : ImageDescriptor {
37
38 /**
39 * The class whose resource directory contain the file,
40 * or <code>null</code> if none.
41 */
42 private ClassInfo location;
43
44 /**
45 * The name of the file.
46 */
47 private String name;
48
49 /**
50 * Creates a new file image descriptor.
51 * The file has the given file name and is located
52 * in the given class's resource directory. If the given
53 * class is <code>null</code>, the file name must be absolute.
54 * <p>
55 * Note that the file is not accessed until its
56 * <code>getImageDate</code> method is called.
57 * </p>
58 *
59 * @param clazz class for resource directory, or
60 * <code>null</code>
61 * @param filename the name of the file
62 */
63 this(ClassInfo clazz, String filename) {
64 this.location = clazz;
65 this.name = filename;
66 }
67
68 /* (non-Javadoc)
69 * Method declared on Object.
70 */
71 public bool equals(Object o) {
72 if (!( cast(FileImageDescriptor)o )) {
73 return false;
74 }
75 FileImageDescriptor other = cast(FileImageDescriptor) o;
76 if (location !is null) {
77 if ( location.name != other.location.name ) {
78 return false;
79 }
80 } else {
81 if (other.location !is null) {
82 return false;
83 }
84 }
85 return name == other.name;
86 }
87
88 /* (non-Javadoc)
89 * Method declared on ImageDesciptor.
90 * Returns null if the image data cannot be read.
91 */
92 public ImageData getImageData() {
93 InputStream in_ = getStream();
94 ImageData result = null;
95 if (in_ !is null) {
96 try {
97 result = new ImageData(in_);
98 } catch (DWTException e) {
99 if (e.code !is DWT.ERROR_INVALID_IMAGE) {
100 throw e;
101 // fall through otherwise
102 }
103 } finally {
104 in_.close();
105 }
106 }
107 return result;
108 }
109
110 /**
111 * Returns a stream on the image contents. Returns
112 * null if a stream could not be opened.
113 *
114 * @return the buffered stream on the file or <code>null</code>
115 * if the file cannot be found
116 */
117 private InputStream getStream() {
118 InputStream is_ = null;
119
120 if (location !is null) {
121 is_ = ClassInfoGetResourceAsStream( location, name);
122
123 } else {
124 try {
125 is_ = new FileInputStream(name);
126 } catch (/+FileNotFoundException+/ IOException e) {
127 return null;
128 }
129 }
130 if (is_ is null) {
131 return null;
132 } else {
133 return new BufferedInputStream(is_);
134 }
135 }
136
137 /* (non-Javadoc)
138 * Method declared on Object.
139 */
140 public override hash_t toHash() {
141 int code = dwt.dwthelper.utils.toHash(name);
142 if (location !is null) {
143 code += location.toHash();
144 }
145 return code;
146 }
147
148 /* (non-Javadoc)
149 * Method declared on Object.
150 */
151 /**
152 * The <code>FileImageDescriptor</code> implementation of this <code>Object</code> method
153 * returns a string representation of this object which is suitable only for debugging.
154 */
155 public override String toString() {
156 return "FileImageDescriptor(location=" ~ location.toString() ~ ", name=" ~ name ~ ")";//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
157 }
158 }