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1
5
6 package org.infohazard.maverick.transform;
7
8 import java.io.IOException  ;
9 import java.io.Reader ;
10 import java.io.StringWriter ;
11
12 import javax.servlet.ServletException ;
13 import javax.xml.transform.OutputKeys ;
14 import javax.xml.transform.Result ;
15 import javax.xml.transform.Source ;
16 import javax.xml.transform.Transformer ;
17 import javax.xml.transform.TransformerConfigurationException ;
18 import javax.xml.transform.TransformerException ;
19 import javax.xml.transform.TransformerFactory ;
20 import javax.xml.transform.sax.SAXTransformerFactory ;
21 import javax.xml.transform.sax.TransformerHandler ;
22 import javax.xml.transform.stream.StreamResult ;
23
24 import org.apache.commons.logging.Log;
25 import org.apache.commons.logging.LogFactory;
26 import org.infohazard.maverick.flow.TransformContext;
27 import org.xml.sax.ContentHandler ;
28
29
33 public abstract class StringTransformStep extends AbstractTransformStep
34 {
35
38 private static Log log = LogFactory.getLog(StringTransformStep.class);
39
40
45 public StringTransformStep(TransformContext tctx) throws ServletException
46 {
47 super(tctx);
48 }
49
50
53 public ContentHandler getSAXHandler() throws IOException , ServletException
54 {
55 log.debug("Creating TransformerHandler which sends to next step output stream.");
56
57 try
58 {
59 SAXTransformerFactory saxTFact = (SAXTransformerFactory )TransformerFactory.newInstance();
60 TransformerHandler tHandler = saxTFact.newTransformerHandler();
61
62 Result res = new StreamResult (this.getResponse().getOutputStream());
63 tHandler.setResult(res);
64
65 return tHandler;
66 }
67 catch (TransformerConfigurationException ex)
68 {
69 throw new ServletException (ex);
70 }
71 }
72
73
77 public void done() throws IOException , ServletException
78 {
79 log.debug("Done being written to");
80
81 if (this.fakeResponse == null)
82 {
83 throw new IllegalStateException ("done() called illegally");
84 }
85 else
86 {
87 this.go(this.fakeResponse.getOutputAsString());
88 this.fakeResponse = null;
89 }
90 }
91
92
96 public void go(Source input) throws IOException , ServletException
97 {
98 log.debug("Building String from Source");
99
100 try
101 {
102 TransformerFactory tFactory = TransformerFactory.newInstance();
103 Transformer trans = tFactory.newTransformer();
104
105 trans.setOutputProperty(OutputKeys.INDENT, "no");
106
107 StringWriter output = new StringWriter ();
108 Result res = new javax.xml.transform.stream.StreamResult (output);
109
110 trans.transform(input, res);
111
112 this.go(output.toString());
113 }
114 catch (TransformerException ex)
115 {
116 throw new ServletException (ex);
117 }
118 }
119
120
124 public void go(Reader input) throws IOException , ServletException
125 {
126 log.debug("Building String from Reader");
127
128 StringWriter output = new StringWriter ();
129 while (input.ready())
130 output.write(input.read());
131
132 this.go(output.toString());
133 }
134
135
139 public abstract void go(String input) throws IOException , ServletException ;
140 }
141 |
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