Source Code Cross Referenced for NodeInputStream.java in  » Testing » XMLUnit » org » custommonkey » xmlunit » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » XMLUnit » org.custommonkey.xmlunit 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         ******************************************************************
003:        Copyright (c) 2001-2007, Jeff Martin, Tim Bacon
004:        All rights reserved.
005:
006:        Redistribution and use in source and binary forms, with or without
007:        modification, are permitted provided that the following conditions
008:        are met:
009:
010:         * Redistributions of source code must retain the above copyright
011:              notice, this list of conditions and the following disclaimer.
012:         * Redistributions in binary form must reproduce the above
013:              copyright notice, this list of conditions and the following
014:              disclaimer in the documentation and/or other materials provided
015:              with the distribution.
016:         * Neither the name of the xmlunit.sourceforge.net nor the names
017:              of its contributors may be used to endorse or promote products
018:              derived from this software without specific prior written
019:              permission.
020:
021:        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
022:        "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
023:        LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
024:        FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
025:        COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
026:        INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
027:        BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
028:        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
029:        CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
030:        LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
031:        ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
032:        POSSIBILITY OF SUCH DAMAGE.
033:
034:         ******************************************************************
035:         */
036:
037:        package org.custommonkey.xmlunit;
038:
039:        import java.io.ByteArrayOutputStream;
040:        import java.io.InputStream;
041:        import java.io.IOException;
042:        import java.util.Properties;
043:        import javax.xml.transform.stream.StreamResult;
044:        import org.w3c.dom.Node;
045:
046:        /**
047:         * Adapter class to present the content of a DOM Node (e.g. a Document) as an
048:         * InputStream using a DOM to Stream transformation.
049:         * <br />Examples and more at <a href="http://xmlunit.sourceforge.net"/>xmlunit.sourceforge.net</a>
050:         */
051:        public class NodeInputStream extends InputStream {
052:            private final Node rootNode;
053:            private final ByteArrayOutputStream nodeContentBytes;
054:            private final Properties outputProperties;
055:            private int atPos = 0;
056:
057:            /**
058:             * Simple constructor
059:             * @param rootNode the node to be presented as an input stream
060:             */
061:            public NodeInputStream(Node rootNode) {
062:                this (rootNode, null);
063:            }
064:
065:            /**
066:             * Simple constructor
067:             * @param rootNode the node to be presented as an input stream
068:             */
069:            public NodeInputStream(Node rootNode, Properties outputProperties) {
070:                this .rootNode = rootNode;
071:                nodeContentBytes = new ByteArrayOutputStream();
072:                this .outputProperties = outputProperties;
073:            }
074:
075:            /**
076:             * Do the actual work of serializing the node to bytes
077:             * @throws IOException if serialization goes awry
078:             */
079:            private void ensureContentAvailable() throws IOException {
080:                if (nodeContentBytes.size() > 0) {
081:                    return;
082:                }
083:                try {
084:                    Transform serializeTransform = new Transform(rootNode);
085:                    if (outputProperties != null) {
086:                        serializeTransform
087:                                .setOutputProperties(outputProperties);
088:                    }
089:                    StreamResult byteResult = new StreamResult(nodeContentBytes);
090:                    serializeTransform.transformTo(byteResult);
091:                } catch (Exception e) {
092:                    throw new IOException(
093:                            "Unable to serialize document to outputstream: "
094:                                    + e.toString());
095:                }
096:            }
097:
098:            /**
099:             * InputStream method
100:             * @return byte as read
101:             * @throws IOException
102:             */
103:            public int read() throws IOException {
104:                ensureContentAvailable();
105:                if (reallyAvailable() == 0) {
106:                    return -1;
107:                }
108:                int contentByte = nodeContentBytes.toByteArray()[atPos];
109:                atPos++;
110:                return contentByte;
111:            }
112:
113:            /**
114:             * InputStream method
115:             * Note that calling close allows a repeated read of the content
116:             * @throws IOException
117:             */
118:            public void close() throws IOException {
119:                atPos = 0;
120:            }
121:
122:            /**
123:             * InputStream method
124:             * @return number of bytes available
125:             */
126:            public int available() throws IOException {
127:                ensureContentAvailable();
128:                return reallyAvailable();
129:            }
130:
131:            /**
132:             * @return really available
133:             */
134:            private int reallyAvailable() {
135:                return nodeContentBytes.size() - atPos;
136:            }
137:        }
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