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1
23
24 package org.dbforms.servlets.reports;
25
26 import org.apache.commons.beanutils.PropertyUtils;
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29
30
31 import org.dbforms.util.Util;
32 import org.dbforms.util.external.FileUtil;
33
34 import java.io.BufferedReader  ;
35 import java.io.ByteArrayOutputStream ;
36 import java.io.File ;
37 import java.io.FileReader ;
38 import java.io.OutputStream ;
39
40 import javax.servlet.ServletContext ;
41 import javax.servlet.ServletException ;
42 import javax.servlet.http.HttpServletRequest ;
43 import javax.servlet.http.HttpServletResponse ;
44 import javax.servlet.http.HttpSession ;
45
46
75 public abstract class LineReportServletAbstract extends ReportServletAbstract {
76 private static Log logCat = LogFactory
77 .getLog(LineReportServletAbstract.class);
78
79 protected abstract String getMimeType();
80
81 protected abstract String getFileExtension();
82
83 protected abstract void writeData(Object [] data) throws Exception ;
84 protected abstract void openStream(OutputStream out) throws Exception ;
85 protected abstract void closeStream(OutputStream out) throws Exception ;
86
87 private static final String REPORTMIMETYPEPARAM = "reportMimeType";
88
89 private String mimeType = getMimeType();
90
91 private int rownum = 0;
92
93 public void init() throws ServletException {
94 super.init();
95 String value = getServletConfig().getInitParameter(REPORTMIMETYPEPARAM);
96 if (!Util.isNull(value)) {
97 mimeType = value;
98 }
99 }
100
101 protected String getReportFileExtension() {
102 return ".xr";
103 }
104
105 protected void writeHeader(String [] header) throws Exception {
106 writeData(header);
107 }
108
109 private Object getFieldValue(HttpServletRequest request,
110 JRDataSourceAbstract dataSource, String search) {
111 Object o = null;
112 search = search.replaceAll("__", ".");
113
114 if (search.startsWith("internal.")) {
115 search = search.substring(search.indexOf("internal."));
116 logCat.debug("Trying to find data for internal value: " + search);
117 o = getInternalValue(search);
118 } else if (search.startsWith("request.")) {
119 search = search.substring(search.indexOf("request."));
120 logCat.debug("Trying to find data for page context value: "
121 + search);
122 o = getRequestValue(request, search);
123 } else if (search.startsWith("session.")) {
124 search = search.substring(search.indexOf("session."));
125 logCat.debug("Trying to find data for session value: " + search);
126 o = getSessionValue(request.getSession(), search);
127 } else {
128 logCat.debug("Trying to find data for field named: " + search);
129 o = dataSource.getFieldValue(search);
130 }
131 return o;
132
133 }
134
135 private Object getInternalValue(String search) {
136 Object obj = null;
137 try {
138 logCat.debug("Trying to find data for internal var : " + search);
139 if (search.equalsIgnoreCase("rownum")) {
140 return new Integer (rownum);
141 }
142 } catch (Exception e) {
143 logCat.error("getInternalValue: " + e);
144 }
145
146 return obj;
147 }
148
149 private Object getRequestValue(HttpServletRequest request, String search) {
150 Object obj = null;
151 int pos;
152 try {
153 pos = search.indexOf(".");
154 if (pos == -1) {
155 obj = request.getAttribute(search);
157 } else {
158 String search_bean = search.substring(0, pos);
161 search = search.substring(pos + 1);
162 Object bean = request.getAttribute(search_bean);
163 if (bean != null) {
164 logCat.debug("calling PropertyUtils.getProperty " + search_bean
165 + " " + search);
166 obj = PropertyUtils.getProperty(bean, search);
167 }
168 }
169 } catch (Exception e) {
170 logCat.error("getPageContextValue: " + e);
171 }
172
173 return obj;
174 }
175
176 private Object getSessionValue(HttpSession session, String search) {
177 Object obj = null;
178 int pos;
179 try {
180 pos = search.indexOf(".");
181 if (pos == -1) {
182 obj = session.getAttribute(search);
184 } else {
185 String search_bean = search.substring(0, pos);
187 search = search.substring(pos + 1);
188 Object bean = session.getAttribute(search_bean);
189 if (bean != null) {
190 logCat.debug("calling PropertyUtils.getProperty " + search_bean
191 + " " + search);
192 obj = PropertyUtils.getProperty(bean, search);
193 }
194 }
195 } catch (Exception e) {
196 logCat.error("getSessionValue: " + e);
197 }
198
199 return obj;
200 }
201
202 private ReportWriter fillReport(HttpServletRequest request,
203 String [] header, String [] fields, JRDataSourceAbstract dataSource)
204 throws Exception {
205 ReportWriter res = new ReportWriter();
206 res.mimeType = mimeType;
207 res.data = new ByteArrayOutputStream ();
208 res.fileName = getFileExtension();
209 openStream(res.data);
210 writeHeader(header);
211 Object [] data = new Object [fields.length];
213 while (dataSource.next()) {
214 rownum++;
215 for (int i = 0; i < fields.length; i++) {
216 data[i] = getFieldValue(request, dataSource, fields[i]);
217 }
218 writeData(data);
219 }
220 closeStream(res.data);
221 return res;
222 }
223
224
241 protected ReportWriter processReport(String reportFileFullName,
242 JRDataSourceAbstract dataSource, ServletContext context,
243 HttpServletRequest request, HttpServletResponse response) {
244
245 try {
246 File f = new File (reportFileFullName + getReportFileExtension());
247 BufferedReader in = new BufferedReader (new FileReader (f));
248 String line1 = in.readLine();
249 String line2 = in.readLine();
250 String fields = null;
251 String headers = null;
252 if (Util.isNull(line2)) {
253 fields = line1;
254 } else {
255 headers = line1;
256 fields = line2;
257 }
258 if (Util.isNull(fields)) {
259 logCat.error("no fields found");
260 return null;
261 }
262 String [] reportFields = fields.split(",");
263 String [] headerFields;
264 if (headers != null) {
265 headerFields = headers.split(",");
266 } else {
267 headerFields = new String [] {};
268 }
269 if (reportFields.length != headerFields.length) {
270 logCat.error("reportFields.length != headerFields.length");
271 headerFields = reportFields;
272 }
273 if (reportFields.length == 0) {
274 logCat.error("no fields found");
275 return null;
276 }
277
278 ReportWriter res = fillReport(request, headerFields, reportFields,
279 dataSource);
280 if (res != null) {
281 StringBuffer buf = new StringBuffer ();
282 buf.append(FileUtil.filename(reportFileFullName));
283 buf.append(res.fileName);
284 res.fileName = buf.toString();
285 }
286 return res;
287 } catch (Exception e) {
288 logCat.error("read report file", e);
289 handleException(request, response, e);
290 return null;
291 }
292 }
293
294
295 }
296 |
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