47 * }
48 *
49 * public List<Image> getResolutionVariants() {
50 * return Collections.unmodifiableList(Arrays.asList(resolutionVariants));
51 * }
52 *
53 * protected Image getBaseImage() {
54 * return resolutionVariants[0];
55 * }
56 * }
57 * } </pre>
58 *
59 * @see java.awt.Image
60 * @see java.awt.image.MultiResolutionImage
61 *
62 * @since 9
63 */
64 public abstract class AbstractMultiResolutionImage extends java.awt.Image
65 implements MultiResolutionImage {
66
67 @Override
68 public int getWidth(ImageObserver observer) {
69 return getBaseImage().getWidth(observer);
70 }
71
72 @Override
73 public int getHeight(ImageObserver observer) {
74 return getBaseImage().getHeight(observer);
75 }
76
77 @Override
78 public ImageProducer getSource() {
79 return getBaseImage().getSource();
80 }
81
82 @Override
83 public Graphics getGraphics() {
84 throw new UnsupportedOperationException("getGraphics() not supported"
85 + " on Multi-Resolution Images");
86 }
87
88 @Override
89 public Object getProperty(String name, ImageObserver observer) {
90 return getBaseImage().getProperty(name, observer);
91 }
92
93 /**
94 * Return the base image representing the best version of the image for
95 * rendering at the default width and height.
96 *
97 * @return the base image of the set of multi-resolution images
98 *
99 * @since 9
100 */
101 protected abstract Image getBaseImage();
102 }
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47 * }
48 *
49 * public List<Image> getResolutionVariants() {
50 * return Collections.unmodifiableList(Arrays.asList(resolutionVariants));
51 * }
52 *
53 * protected Image getBaseImage() {
54 * return resolutionVariants[0];
55 * }
56 * }
57 * } </pre>
58 *
59 * @see java.awt.Image
60 * @see java.awt.image.MultiResolutionImage
61 *
62 * @since 9
63 */
64 public abstract class AbstractMultiResolutionImage extends java.awt.Image
65 implements MultiResolutionImage {
66
67 /**
68 * This method simply delegates to the same method on the base image and
69 * it is equivalent to: {@code getBaseImage().getWidth(observer)}.
70 * @return returns an integer value of the image width
71 * @see #getBaseImage()
72 *
73 * @since 9
74 */
75 @Override
76 public int getWidth(ImageObserver observer) {
77 return getBaseImage().getWidth(observer);
78 }
79
80 /**
81 * This method simply delegates to the same method on the base image and
82 * it is equivalent to: {@code getBaseImage().getHeight(observer)}.
83 *
84 * @return returns an integer value of the image height
85 * @see #getBaseImage()
86 *
87 * @since 9
88 */
89 @Override
90 public int getHeight(ImageObserver observer) {
91 return getBaseImage().getHeight(observer);
92 }
93
94 /**
95 * This method simply delegates to the same method on the base image and
96 * it is equivalent to: {@code getBaseImage().getSource()}.
97 *
98 * @return returns an ImageProducer object reference to the source image
99 * @see #getBaseImage()
100 *
101 * @since 9
102 */
103 @Override
104 public ImageProducer getSource() {
105 return getBaseImage().getSource();
106 }
107
108 /**
109 * As per the contract of the base {@code Image#getGraphics()} method,
110 * this implementation will always throw {@code UnsupportedOperationException}
111 * since only off-screen images can return a {@code Graphics} object.
112 * @return Only {@code UnsupportedOperationException} is thrown
113 * @throws UnsupportedOperationException this method is not supported
114 */
115 @Override
116 public Graphics getGraphics() {
117 throw new UnsupportedOperationException("getGraphics() not supported"
118 + " on Multi-Resolution Images");
119 }
120
121 /**
122 * This method simply delegates to the same method on the base image and
123 * it is equivalent to: {@code getBaseImage().getProperty(name, observer)}.
124 *
125 * @return returns an Object corresponding to the property of base image
126 * @see #getBaseImage()
127 *
128 * @since 9
129 */
130 @Override
131 public Object getProperty(String name, ImageObserver observer) {
132 return getBaseImage().getProperty(name, observer);
133 }
134
135 /**
136 * Return the base image representing the best version of the image for
137 * rendering at the default width and height.
138 *
139 * @return the base image of the set of multi-resolution images
140 *
141 * @since 9
142 */
143 protected abstract Image getBaseImage();
144 }
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