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1
21
22 package nu.xom.samples;
23
24 import java.io.IOException  ;
25 import java.io.InputStream ;
26 import java.io.OutputStreamWriter ;
27 import java.math.BigInteger ;
28
29 import javax.servlet.ServletException ;
30 import javax.servlet.SingleThreadModel ;
31 import javax.servlet.http.HttpServlet ;
32 import javax.servlet.http.HttpServletRequest ;
33 import javax.servlet.http.HttpServletResponse ;
34
35 import nu.xom.Builder;
36 import nu.xom.Document;
37 import nu.xom.Element;
38 import nu.xom.WellformednessException;
39
40
41
51 public class FibonacciXOMSOAPServlet extends HttpServlet
52 implements SingleThreadModel {
53
54 public final static String MALFORMED_REQUEST_DOCUMENT
56 = "MalformedRequest";
57 public final static String INVALID_REQUEST_DOCUMENT
58 = "InvalidRequest";
59 public final static String INDEX_MISSING
60 = "IndexMissing";
61 public final static String NON_POSITIVE_INDEX
62 = "NonPositiveIndex";
63 public final static String BAD_INTEGER_FORMAT
64 = "BadIntegerFormat";
65 public final static String UNEXPECTED_PROBLEM
66 = "UnexpectedProblem";
67
68 private transient Builder parser;
69
70 public void init() throws ServletException {
72
73 try {
74 this.parser = new Builder();
75 }
76 catch (Exception ex) {
77 throw new ServletException (
78 "Could not locate a XOM parser", ex);
79 }
80
81 }
82
83
84 public void doPost(HttpServletRequest servletRequest,
85 HttpServletResponse servletResponse)
86 throws ServletException , IOException {
87
88 servletResponse.setContentType("application/soap+xml; charset=UTF-8");
89 OutputStreamWriter out = new OutputStreamWriter (
90 servletResponse.getOutputStream(), "UTF-8");
91 InputStream in = servletRequest.getInputStream();
92
93 Document request;
94 Document response;
95 String generations ="here";
96 try {
97 request = parser.build(in);
98
99
109
110 generations = request.getValue().trim();
111 int numberOfGenerations = Integer.parseInt(generations);
112 BigInteger result = calculateFibonacci(numberOfGenerations);
113 response = makeResponseDocument(result);
114 }
115 catch (WellformednessException ex) {
116 response = makeFaultDocument(MALFORMED_REQUEST_DOCUMENT,
117 ex.getMessage());
118 }
119 catch (NullPointerException ex) {
120 response = makeFaultDocument(INDEX_MISSING,
121 ex.getMessage());
122 }
123 catch (NumberFormatException ex) {
124 response = makeFaultDocument(BAD_INTEGER_FORMAT,
125 generations + ex.getMessage());
126 }
127 catch (IndexOutOfBoundsException ex) {
128 response = makeFaultDocument(NON_POSITIVE_INDEX,
129 ex.getMessage());
130 }
131 catch (Exception ex) {
132 response = makeFaultDocument(UNEXPECTED_PROBLEM,
133 ex.getMessage());
134 }
135
136 try {
138 out.write(response.toXML());
139 servletResponse.flushBuffer();
140 out.flush();
141 }
142 catch (IOException ex) {
143 throw new ServletException (ex);
146 }
147 finally {
148 in.close();
149 out.close();
150 }
151
152 }
153
154
155 public Document makeResponseDocument(BigInteger result) {
158
159 Element envelope = new Element("SOAP-ENV:Envelope",
160 "http://schemas.xmlsoap.org/soap/envelope/");
161 Document response = new Document(envelope);
162 Element body = new Element("SOAP-ENV:Body",
163 "http://schemas.xmlsoap.org/soap/envelope/");
164 envelope.appendChild(body);
165
166 Element Fibonacci_Numbers = new Element("Fibonacci_Numbers",
167 "http://namespaces.cafeconleche.org/xmljava/ch3/");
168 body.appendChild(Fibonacci_Numbers);
169
170 Element fibonacci = new Element("fibonacci",
171 "http://namespaces.cafeconleche.org/xmljava/ch3/");
172 Fibonacci_Numbers.appendChild(fibonacci);
173 fibonacci.appendChild(result.toString());
174
175 return response;
176
177 }
178
179
180 public Document makeFaultDocument(String code, String message){
181
182 Element envelope = new Element("SOAP-ENV:Envelope",
183 "http://schemas.xmlsoap.org/soap/envelope/");
184 Document faultDoc = new Document(envelope);
185
186 Element body = new Element("SOAP-ENV:Body",
187 "http://schemas.xmlsoap.org/soap/envelope/");
188 envelope.appendChild(body);
189
190 Element fault = new Element("Fault",
191 "http://schemas.xmlsoap.org/soap/envelope/");
192 body.appendChild(fault);
193
194 Element faultCode = new Element("faultcode");
195 fault.appendChild(faultCode);
196
197 Element faultString = new Element("faultstring");
198 fault.appendChild(faultString);
199
200 faultCode.appendChild(code);
201
202 faultString.appendChild(message);
203
204 return faultDoc;
205
206 }
207
208
209 public static BigInteger calculateFibonacci(int generations)
210 throws IndexOutOfBoundsException {
211
212 if (generations < 1) {
213 throw new IndexOutOfBoundsException (
214 "Fibonacci numbers are not defined for " + generations
215 + "or any other number less than one.");
216 }
217 BigInteger low = BigInteger.ONE;
218 BigInteger high = BigInteger.ONE;
219 for (int i = 2; i <= generations; i++) {
220 BigInteger temp = high;
221 high = high.add(low);
222 low = temp;
223 }
224 return low;
225
226 }
227
228 }
229 |
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