Source Code Cross Referenced for ImageDecoder.java in  » Graphic-Library » xmlgraphics-commons-1.2 » org » apache » xmlgraphics » image » codec » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Graphic Library » xmlgraphics commons 1.2 » org.apache.xmlgraphics.image.codec.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Licensed to the Apache Software Foundation (ASF) under one or more
03:         * contributor license agreements.  See the NOTICE file distributed with
04:         * this work for additional information regarding copyright ownership.
05:         * The ASF licenses this file to You under the Apache License, Version 2.0
06:         * (the "License"); you may not use this file except in compliance with
07:         * the License.  You may obtain a copy of the License at
08:         * 
09:         *      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:        /* $Id: ImageDecoder.java 447277 2006-09-18 06:19:34Z jeremias $ */
19:
20:        package org.apache.xmlgraphics.image.codec.util;
21:
22:        import java.awt.image.Raster;
23:        import java.awt.image.RenderedImage;
24:        import java.io.IOException;
25:
26:        /**
27:         * An interface describing objects that transform an InputStream into a
28:         * BufferedImage or Raster.
29:         *
30:         */
31:        public interface ImageDecoder {
32:
33:            /**
34:             * Returns the current parameters as an instance of the
35:             * ImageDecodeParam interface.  Concrete implementations of this
36:             * interface will return corresponding concrete implementations of
37:             * the ImageDecodeParam interface.  For example, a JPEGImageDecoder
38:             * will return an instance of JPEGDecodeParam.
39:             */
40:            ImageDecodeParam getParam();
41:
42:            /**
43:             * Sets the current parameters to an instance of the 
44:             * ImageDecodeParam interface.  Concrete implementations
45:             * of ImageDecoder may throw a RuntimeException if the
46:             * param argument is not an instance of the appropriate
47:             * subclass or subinterface.  For example, a JPEGImageDecoder
48:             * will expect param to be an instance of JPEGDecodeParam.
49:             */
50:            void setParam(ImageDecodeParam param);
51:
52:            /** Returns the SeekableStream associated with this ImageDecoder. */
53:            SeekableStream getInputStream();
54:
55:            /** Returns the number of pages present in the current stream. */
56:            int getNumPages() throws IOException;
57:
58:            /**
59:             * Returns a Raster that contains the decoded contents of the
60:             * SeekableStream associated with this ImageDecoder.  Only
61:             * the first page of a multi-page image is decoded.
62:             */
63:            Raster decodeAsRaster() throws IOException;
64:
65:            /**
66:             * Returns a Raster that contains the decoded contents of the
67:             * SeekableStream associated with this ImageDecoder.
68:             * The given page of a multi-page image is decoded.  If
69:             * the page does not exist, an IOException will be thrown.
70:             * Page numbering begins at zero.
71:             *
72:             * @param page The page to be decoded.
73:             */
74:            Raster decodeAsRaster(int page) throws IOException;
75:
76:            /**
77:             * Returns a RenderedImage that contains the decoded contents of the
78:             * SeekableStream associated with this ImageDecoder.  Only
79:             * the first page of a multi-page image is decoded.
80:             */
81:            RenderedImage decodeAsRenderedImage() throws IOException;
82:
83:            /**
84:             * Returns a RenderedImage that contains the decoded contents of the
85:             * SeekableStream associated with this ImageDecoder.
86:             * The given page of a multi-page image is decoded.  If
87:             * the page does not exist, an IOException will be thrown.
88:             * Page numbering begins at zero.
89:             *
90:             * @param page The page to be decoded.
91:             */
92:            RenderedImage decodeAsRenderedImage(int page) throws IOException;
93:        }
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