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18 package org.apache.commons.jci.examples.serverpages;
19
20 import java.io.ByteArrayOutputStream;
21 import java.io.File;
22 import java.io.FileInputStream;
23 import java.io.IOException;
24 import java.io.InputStreamReader;
25 import java.io.OutputStreamWriter;
26 import java.io.Reader;
27 import java.io.Writer;
28
29 import org.apache.commons.jci.utils.ConversionUtils;
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31
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33
34 public final class JspGenerator {
35
36 private String quote( final String s ) {
37
38 final StringBuilder sb = new StringBuilder();
39 final char[] input = s.toCharArray();
40
41 for (char c : input) {
42 if (c == '"') {
43 sb.append('\\');
44 }
45 if (c == '\\') {
46 sb.append('\\');
47 }
48
49 if (c == '\n') {
50 sb.append("\");\n").append(" out.write(\"");
51 continue;
52 }
53 sb.append(c);
54 }
55
56 return sb.toString();
57 }
58
59 private void wrap( final StringBuilder pInput, final Writer pOutput ) throws IOException {
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61 pOutput.append(" out.write(\"");
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63 pOutput.append(quote(pInput.toString()));
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65 pOutput.append("\");").append('\n');
66 }
67
68 public byte[] generateJavaSource( final String pResourceName, final File pFile ) {
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70 final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
71 final Writer output = new OutputStreamWriter(outputStream);
72
73 try {
74 final Reader input = new InputStreamReader(new FileInputStream(pFile));
75
76 final int p = pResourceName.lastIndexOf('/');
77
78 final String className;
79 final String packageName;
80
81 if (p < 0) {
82 className = ConversionUtils.stripExtension(pResourceName);
83 packageName = "";
84 } else {
85 className = ConversionUtils.stripExtension(pResourceName.substring(p+1));
86 packageName = pResourceName.substring(0, p).replace('/', '.');
87 output.append("package ").append(packageName).append(";").append('\n');
88 }
89
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91 output.append("import java.io.PrintWriter;").append('\n');
92 output.append("import java.io.IOException;").append('\n');
93 output.append("import javax.servlet.http.HttpServlet;").append('\n');
94 output.append("import javax.servlet.http.HttpServletRequest;").append('\n');
95 output.append("import javax.servlet.http.HttpServletResponse;").append('\n');
96 output.append("import javax.servlet.ServletException;").append('\n');
97 output.append("public class ").append(className).append(" extends HttpServlet {").append('\n');
98 output.append(" protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {").append('\n');
99 output.append(" final PrintWriter out = response.getWriter();").append('\n');
100
101
102 final char[] open = "<?".toCharArray();
103 final char[] close = "?>".toCharArray();
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105 StringBuilder sb = new StringBuilder();
106 char[] watch = open;
107 int w = 0;
108 while(true) {
109 int c = input.read();
110
111 if (c < 0) {
112 break;
113 }
114
115 if (c == watch[w]) {
116 w++;
117 if (watch.length == w) {
118 if (watch == open) {
119
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121 wrap(sb, output);
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123 sb = new StringBuilder();
124 watch = close;
125 } else if (watch == close) {
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127
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129 output.append(sb.toString());
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131 sb = new StringBuilder();
132 watch = open;
133 }
134 w = 0;
135 }
136 } else {
137 if (w > 0) {
138 sb.append(watch, 0, w);
139 }
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141 sb.append((char)c);
142
143 w = 0;
144 }
145 }
146
147 if (watch == open) {
148 wrap(sb, output);
149 }
150
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152 output.append(" out.close();").append('\n');
153 output.append(" out.flush();").append('\n');
154 output.append(" }").append('\n');
155 output.append("}").append('\n');
156
157 return outputStream.toByteArray();
158
159 } catch (IOException e) {
160 return null;
161 } finally {
162 try {
163 output.close();
164 } catch (IOException e) {
165 }
166 }
167 }
168
169 }