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1 package org.apache.slide.projector.value;
2
3 import java.io.ByteArrayInputStream  ;
4 import java.io.ByteArrayOutputStream ;
5 import java.io.IOException ;
6 import java.io.InputStream ;
7 import java.util.logging.Level ;
8 import java.util.logging.Logger ;
9
10 import org.jdom.DocType;
11 import org.jdom.Document;
12 import org.jdom.Element;
13 import org.jdom.JDOMException;
14 import org.jdom.input.SAXBuilder;
15 import org.jdom.output.Format;
16 import org.jdom.output.XMLOutputter;
17
18 public class DocumentValue extends AbstractStreamableValue implements XMLValue {
19 private static Logger logger = Logger.getLogger(DocumentValue.class.getName());
20
21 private final static XMLOutputter xmlOutputter = new XMLOutputter(Format.getPrettyFormat());
22 private byte[] bytes = null;
23 private Document document;
24 private boolean documentCreated = false;
25 private InputStream inputStream = null;
26
27 public DocumentValue(StreamableValue streamableResource) throws IOException {
28 this(streamableResource.getInputStream());
29 }
30
31 public DocumentValue(InputStream inputStream) {
32 this.inputStream = inputStream;
33 }
34
35 public DocumentValue(Document document) {
36 this.document = document;
37 documentCreated = true;
38 }
39
40 public InputStream getInputStream() throws IOException {
41 if ( inputStream != null ) return inputStream;
42 if ( bytes == null ) {
43 bytes = getBytes();
44 }
45 InputStream inputStream = new ByteArrayInputStream (bytes);
46 return inputStream;
47 }
48
49 private byte[] getBytes() throws IOException {
50 ByteArrayOutputStream outputStream = new ByteArrayOutputStream ();
51 xmlOutputter.output(getDocument(), outputStream);
52 return outputStream.toByteArray();
53 }
54
55 public void enableMultipleStreaming() {}
56
57 public DocType getDocumentType() {
58 DocType docType = getDocument().getDocType();
59 if (docType == null) {
60 docType = new DocType(getDocument().getRootElement().getName());
61 getDocument().setDocType(docType);
62 }
63 return docType;
64 }
65
66 public Document getDocument() {
67 if ( !documentCreated ) {
68 documentCreated = true;
69 SAXBuilder saxBuilder = new SAXBuilder();
70 try {
71 document = saxBuilder.build(inputStream);
72 } catch (JDOMException e) {
73 logger.log(Level.SEVERE, "Could not create XML document from given input stream", e);
74 document = null;
76 } catch (IOException e) {
77 logger.log(Level.SEVERE, "Could not create XML document from given input stream", e);
78 document = null;
79 }
80 }
81 return document;
82 }
83
84 public Element getRootElement() {
85 return getDocument().getRootElement();
86 }
87
88 public String getContentType() {
89 return XMLValue.CONTENT_TYPE;
90 }
91
92 public String getCharacterEncoding() {
93 return "UTF-8";
94 }
95
96 public int getContentLength() {
97 if ( bytes == null ) {
98 try {
99 bytes = getBytes();
100 } catch ( IOException e ) {
101 return -1;
103 }
104 }
105 return bytes.length;
106 }
107
108 public boolean isDocument() {
109 return true;
110 }
111 } |
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